Use array-bytes for All Array/Bytes/Hex Operations (#12190)

* Use `array-bytes` for All Array/Bytes/Hex Operations Signed-off-by: Xavier Lau <xavier@inv.cafe> * Reorder * Self Review * Format * Fix Tests * Bump `array-bytes` * Optimize large test res Signed-off-by: Xavier Lau <xavier@inv.cafe> Co-authored-by: parity-processbot <>
2026-06-12 05:21:08 +00:00 · 2022-09-21 14:12:20 +08:00
parent e4b6f4a66d
commit 86198c5471
79 changed files with 520 additions and 510 deletions
@@ -112,6 +112,12 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "698b65a961a9d730fb45b6b0327e20207810c9f61ee421b082b27ba003f49e2b"

+[[package]]
+name = "array-bytes"
+version = "4.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6a913633b0c922e6b745072795f50d90ebea78ba31a57e2ac8c2fc7b50950949"
+
 [[package]]
 name = "arrayref"
 version = "0.3.6"
@@ -446,12 +452,12 @@ dependencies = [
 name = "beefy-gadget"
 version = "4.0.0-dev"
 dependencies = [
+ "array-bytes",
 "async-trait",
 "beefy-primitives",
 "fnv",
 "futures",
 "futures-timer",
- "hex",
 "log",
 "parity-scale-codec",
 "parking_lot 0.12.1",
@@ -513,10 +519,9 @@ dependencies = [
 name = "beefy-merkle-tree"
 version = "4.0.0-dev"
 dependencies = [
+ "array-bytes",
 "beefy-primitives",
 "env_logger",
- "hex",
- "hex-literal",
 "log",
 "sp-api",
 "tiny-keccak",
@@ -526,8 +531,7 @@ dependencies = [
 name = "beefy-primitives"
 version = "4.0.0-dev"
 dependencies = [
- "hex",
- "hex-literal",
+ "array-bytes",
 "parity-scale-codec",
 "scale-info",
 "sp-api",
@@ -2112,9 +2116,9 @@ dependencies = [
 name = "frame-benchmarking"
 version = "4.0.0-dev"
 dependencies = [
+ "array-bytes",
 "frame-support",
 "frame-system",
- "hex-literal",
 "linregress",
 "log",
 "parity-scale-codec",
@@ -2138,6 +2142,7 @@ name = "frame-benchmarking-cli"
 version = "4.0.0-dev"
 dependencies = [
 "Inflector",
+ "array-bytes",
 "chrono",
 "clap 3.1.18",
 "comfy-table",
@@ -2147,7 +2152,6 @@ dependencies = [
 "gethostname",
 "handlebars",
 "hash-db",
- "hex",
 "itertools",
 "kvdb",
 "lazy_static",
@@ -2238,10 +2242,10 @@ dependencies = [
 name = "frame-executive"
 version = "4.0.0-dev"
 dependencies = [
+ "array-bytes",
 "frame-support",
 "frame-system",
 "frame-try-runtime",
- "hex-literal",
 "pallet-balances",
 "pallet-transaction-payment",
 "parity-scale-codec",
@@ -2854,12 +2858,6 @@ version = "0.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7f24254aa9a54b5c858eaee2f5bccdb46aaf0e486a595ed5fd8f86ba55232a70"

-[[package]]
-name = "hex-literal"
-version = "0.3.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7ebdb29d2ea9ed0083cd8cece49bbd968021bd99b0849edb4a9a7ee0fdf6a4e0"
-
 [[package]]
 name = "hex_fmt"
 version = "0.3.0"
@@ -3355,7 +3353,6 @@ dependencies = [
 "frame-system-benchmarking",
 "frame-system-rpc-runtime-api",
 "frame-try-runtime",
- "hex-literal",
 "log",
 "node-primitives",
 "pallet-alliance",
@@ -4637,12 +4634,12 @@ dependencies = [
 name = "node-bench"
 version = "0.9.0-dev"
 dependencies = [
+ "array-bytes",
 "clap 3.1.18",
 "derive_more",
 "fs_extra",
 "futures",
 "hash-db",
- "hex",
 "kitchensink-runtime",
 "kvdb",
 "kvdb-rocksdb",
@@ -4674,6 +4671,7 @@ dependencies = [
 name = "node-cli"
 version = "3.0.0-dev"
 dependencies = [
+ "array-bytes",
 "assert_cmd",
 "async-std",
 "clap 3.1.18",
@@ -4683,7 +4681,6 @@ dependencies = [
 "frame-system",
 "frame-system-rpc-runtime-api",
 "futures",
- "hex-literal",
 "jsonrpsee",
 "kitchensink-runtime",
 "log",
@@ -4912,7 +4909,6 @@ dependencies = [
 "frame-system-benchmarking",
 "frame-system-rpc-runtime-api",
 "frame-try-runtime",
- "hex-literal",
 "pallet-aura",
 "pallet-balances",
 "pallet-grandpa",
@@ -5181,11 +5177,10 @@ dependencies = [
 name = "pallet-alliance"
 version = "4.0.0-dev"
 dependencies = [
+ "array-bytes",
 "frame-benchmarking",
 "frame-support",
 "frame-system",
- "hex",
- "hex-literal",
 "log",
 "pallet-balances",
 "pallet-collective",
@@ -5416,12 +5411,11 @@ dependencies = [
 name = "pallet-beefy-mmr"
 version = "4.0.0-dev"
 dependencies = [
+ "array-bytes",
 "beefy-merkle-tree",
 "beefy-primitives",
 "frame-support",
 "frame-system",
- "hex",
- "hex-literal",
 "log",
 "pallet-beefy",
 "pallet-mmr",
@@ -5493,13 +5487,13 @@ dependencies = [
 name = "pallet-contracts"
 version = "4.0.0-dev"
 dependencies = [
+ "array-bytes",
 "assert_matches",
 "bitflags",
 "env_logger",
 "frame-benchmarking",
 "frame-support",
 "frame-system",
- "hex-literal",
 "impl-trait-for-tuples",
 "log",
 "pallet-balances",
@@ -5860,12 +5854,12 @@ dependencies = [
 name = "pallet-mmr"
 version = "4.0.0-dev"
 dependencies = [
+ "array-bytes",
 "ckb-merkle-mountain-range",
 "env_logger",
 "frame-benchmarking",
 "frame-support",
 "frame-system",
- "hex-literal",
 "itertools",
 "parity-scale-codec",
 "scale-info",
@@ -6453,10 +6447,10 @@ dependencies = [
 name = "pallet-transaction-storage"
 version = "4.0.0-dev"
 dependencies = [
+ "array-bytes",
 "frame-benchmarking",
 "frame-support",
 "frame-system",
- "hex-literal",
 "log",
 "pallet-balances",
 "parity-scale-codec",
@@ -7897,11 +7891,11 @@ dependencies = [
 name = "sc-cli"
 version = "0.10.0-dev"
 dependencies = [
+ "array-bytes",
 "chrono",
 "clap 3.1.18",
 "fdlimit",
 "futures",
- "hex",
 "libp2p",
 "log",
 "names",
@@ -8243,9 +8237,9 @@ dependencies = [
 name = "sc-executor"
 version = "0.10.0-dev"
 dependencies = [
+ "array-bytes",
 "criterion",
 "env_logger",
- "hex-literal",
 "lazy_static",
 "lru",
 "num_cpus",
@@ -8339,6 +8333,7 @@ name = "sc-finality-grandpa"
 version = "0.10.0-dev"
 dependencies = [
 "ahash",
+ "array-bytes",
 "assert_matches",
 "async-trait",
 "dyn-clone",
@@ -8346,7 +8341,6 @@ dependencies = [
 "fork-tree",
 "futures",
 "futures-timer",
- "hex",
 "log",
 "parity-scale-codec",
 "parking_lot 0.12.1",
@@ -8427,8 +8421,8 @@ dependencies = [
 name = "sc-keystore"
 version = "4.0.0-dev"
 dependencies = [
+ "array-bytes",
 "async-trait",
- "hex",
 "parking_lot 0.12.1",
 "serde_json",
 "sp-application-crypto",
@@ -8442,6 +8436,7 @@ dependencies = [
 name = "sc-network"
 version = "0.10.0-dev"
 dependencies = [
+ "array-bytes",
 "assert_matches",
 "async-std",
 "async-trait",
@@ -8454,7 +8449,6 @@ dependencies = [
 "fork-tree",
 "futures",
 "futures-timer",
- "hex",
 "ip_network",
 "libp2p",
 "linked-hash-map",
@@ -8565,8 +8559,8 @@ dependencies = [
 name = "sc-network-light"
 version = "0.10.0-dev"
 dependencies = [
+ "array-bytes",
 "futures",
- "hex",
 "libp2p",
 "log",
 "parity-scale-codec",
@@ -8585,9 +8579,9 @@ dependencies = [
 name = "sc-network-sync"
 version = "0.10.0-dev"
 dependencies = [
+ "array-bytes",
 "fork-tree",
 "futures",
- "hex",
 "libp2p",
 "log",
 "lru",
@@ -8647,11 +8641,11 @@ dependencies = [
 name = "sc-offchain"
 version = "4.0.0-dev"
 dependencies = [
+ "array-bytes",
 "bytes",
 "fnv",
 "futures",
 "futures-timer",
- "hex",
 "hyper",
 "hyper-rustls",
 "lazy_static",
@@ -8875,10 +8869,9 @@ dependencies = [
 name = "sc-service-test"
 version = "2.0.0"
 dependencies = [
+ "array-bytes",
 "fdlimit",
 "futures",
- "hex",
- "hex-literal",
 "log",
 "parity-scale-codec",
 "parking_lot 0.12.1",
@@ -9019,11 +9012,11 @@ dependencies = [
 name = "sc-transaction-pool"
 version = "4.0.0-dev"
 dependencies = [
+ "array-bytes",
 "assert_matches",
 "criterion",
 "futures",
 "futures-timer",
- "hex",
 "linked-hash-map",
 "log",
 "parity-scale-codec",
@@ -9761,6 +9754,7 @@ dependencies = [
 name = "sp-core"
 version = "6.0.0"
 dependencies = [
+ "array-bytes",
 "base58",
 "bitflags",
 "blake2",
@@ -9771,8 +9765,6 @@ dependencies = [
 "futures",
 "hash-db",
 "hash256-std-hasher",
- "hex",
- "hex-literal",
 "impl-serde",
 "lazy_static",
 "libsecp256k1",
@@ -9953,7 +9945,7 @@ dependencies = [
 name = "sp-mmr-primitives"
 version = "4.0.0-dev"
 dependencies = [
- "hex-literal",
+ "array-bytes",
 "log",
 "parity-scale-codec",
 "serde",
@@ -10171,9 +10163,9 @@ dependencies = [
 name = "sp-state-machine"
 version = "0.12.0"
 dependencies = [
+ "array-bytes",
 "assert_matches",
 "hash-db",
- "hex-literal",
 "log",
 "num-traits",
 "parity-scale-codec",
@@ -10288,10 +10280,10 @@ name = "sp-trie"
 version = "6.0.0"
 dependencies = [
 "ahash",
+ "array-bytes",
 "criterion",
 "hash-db",
 "hashbrown 0.12.3",
- "hex-literal",
 "lazy_static",
 "lru",
 "memory-db",
@@ -10594,9 +10586,9 @@ dependencies = [
 name = "substrate-test-client"
 version = "2.0.1"
 dependencies = [
+ "array-bytes",
 "async-trait",
 "futures",
- "hex",
 "parity-scale-codec",
 "sc-client-api",
 "sc-client-db",
@@ -46,7 +46,6 @@ pallet-transaction-payment-rpc-runtime-api = { version = "4.0.0-dev", default-fe
 # Used for runtime benchmarking
 frame-benchmarking = { version = "4.0.0-dev", default-features = false, path = "../../../frame/benchmarking", optional = true }
 frame-system-benchmarking = { version = "4.0.0-dev", default-features = false, path = "../../../frame/system/benchmarking", optional = true }
-hex-literal = { version = "0.3.4", optional = true }

 # Local Dependencies
 pallet-template = { version = "4.0.0-dev", default-features = false, path = "../pallets/template" }
@@ -93,7 +92,6 @@ runtime-benchmarks = [
 	"frame-support/runtime-benchmarks",
 	"frame-system-benchmarking/runtime-benchmarks",
 	"frame-system/runtime-benchmarks",
-	"hex-literal",
 	"pallet-balances/runtime-benchmarks",
 	"pallet-grandpa/runtime-benchmarks",
 	"pallet-template/runtime-benchmarks",
@@ -11,6 +11,7 @@ repository = "https://github.com/paritytech/substrate/"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

 [dependencies]
+array-bytes = "4.1"
 clap = { version = "3.1.18", features = ["derive"] }
 log = "0.4.17"
 node-primitives = { version = "2.0.0", path = "../primitives" }
@@ -34,7 +35,6 @@ sp-tracing = { version = "5.0.0", path = "../../../primitives/tracing" }
 hash-db = "0.15.2"
 tempfile = "3.1.0"
 fs_extra = "1"
-hex = "0.4.0"
 rand = { version = "0.7.2", features = ["small_rng"] }
 lazy_static = "1.4.0"
 parity-util-mem = { version = "0.11.0", default-features = false, features = ["primitive-types"] }
@@ -37,8 +37,10 @@ pub fn generate_trie(
 	let (db, overlay) = {
 		let mut overlay = HashMap::new();
 		overlay.insert(
-			hex::decode("03170a2e7597b7b7e3d84c05391d139a62b157e78786d8c082f29dcf4c111314")
-				.expect("null key is valid"),
+			array_bytes::hex2bytes(
+				"03170a2e7597b7b7e3d84c05391d139a62b157e78786d8c082f29dcf4c111314",
+			)
+			.expect("null key is valid"),
 			Some(vec![0]),
 		);
 		let mut trie = SimpleTrie { db, overlay: &mut overlay };
@@ -34,12 +34,12 @@ crate-type = ["cdylib", "rlib"]

 [dependencies]
 # third-party dependencies
+array-bytes = "4.1"
 clap = { version = "3.1.18", features = ["derive"], optional = true }
 codec = { package = "parity-scale-codec", version = "3.0.0" }
 serde = { version = "1.0.136", features = ["derive"] }
 jsonrpsee = { version = "0.15.1", features = ["server"] }
 futures = "0.3.21"
-hex-literal = "0.3.4"
 log = "0.4.17"
 rand = "0.8"

@@ -19,7 +19,6 @@
 //! Substrate chain configurations.

 use grandpa_primitives::AuthorityId as GrandpaId;
-use hex_literal::hex;
 use kitchensink_runtime::{
 	constants::currency::*, wasm_binary_unwrap, AuthorityDiscoveryConfig, BabeConfig,
 	BalancesConfig, Block, CouncilConfig, DemocracyConfig, ElectionsConfig, GrandpaConfig,
@@ -98,84 +97,83 @@ fn staging_testnet_config_genesis() -> GenesisConfig {
 	)> = vec![
 		(
 			// 5Fbsd6WXDGiLTxunqeK5BATNiocfCqu9bS1yArVjCgeBLkVy
-			hex!["9c7a2ee14e565db0c69f78c7b4cd839fbf52b607d867e9e9c5a79042898a0d12"].into(),
+			array_bytes::hex_n_into_unchecked("9c7a2ee14e565db0c69f78c7b4cd839fbf52b607d867e9e9c5a79042898a0d12"),
 			// 5EnCiV7wSHeNhjW3FSUwiJNkcc2SBkPLn5Nj93FmbLtBjQUq
-			hex!["781ead1e2fa9ccb74b44c19d29cb2a7a4b5be3972927ae98cd3877523976a276"].into(),
+			array_bytes::hex_n_into_unchecked("781ead1e2fa9ccb74b44c19d29cb2a7a4b5be3972927ae98cd3877523976a276"),
 			// 5Fb9ayurnxnaXj56CjmyQLBiadfRCqUbL2VWNbbe1nZU6wiC
-			hex!["9becad03e6dcac03cee07edebca5475314861492cdfc96a2144a67bbe9699332"]
+			array_bytes::hex2array_unchecked("9becad03e6dcac03cee07edebca5475314861492cdfc96a2144a67bbe9699332")
 				.unchecked_into(),
 			// 5EZaeQ8djPcq9pheJUhgerXQZt9YaHnMJpiHMRhwQeinqUW8
-			hex!["6e7e4eb42cbd2e0ab4cae8708ce5509580b8c04d11f6758dbf686d50fe9f9106"]
+			array_bytes::hex2array_unchecked("6e7e4eb42cbd2e0ab4cae8708ce5509580b8c04d11f6758dbf686d50fe9f9106")
 				.unchecked_into(),
 			// 5EZaeQ8djPcq9pheJUhgerXQZt9YaHnMJpiHMRhwQeinqUW8
-			hex!["6e7e4eb42cbd2e0ab4cae8708ce5509580b8c04d11f6758dbf686d50fe9f9106"]
+			array_bytes::hex2array_unchecked("6e7e4eb42cbd2e0ab4cae8708ce5509580b8c04d11f6758dbf686d50fe9f9106")
 				.unchecked_into(),
 			// 5EZaeQ8djPcq9pheJUhgerXQZt9YaHnMJpiHMRhwQeinqUW8
-			hex!["6e7e4eb42cbd2e0ab4cae8708ce5509580b8c04d11f6758dbf686d50fe9f9106"]
+			array_bytes::hex2array_unchecked("6e7e4eb42cbd2e0ab4cae8708ce5509580b8c04d11f6758dbf686d50fe9f9106")
 				.unchecked_into(),
 		),
 		(
 			// 5ERawXCzCWkjVq3xz1W5KGNtVx2VdefvZ62Bw1FEuZW4Vny2
-			hex!["68655684472b743e456907b398d3a44c113f189e56d1bbfd55e889e295dfde78"].into(),
+			array_bytes::hex_n_into_unchecked("68655684472b743e456907b398d3a44c113f189e56d1bbfd55e889e295dfde78"),
 			// 5Gc4vr42hH1uDZc93Nayk5G7i687bAQdHHc9unLuyeawHipF
-			hex!["c8dc79e36b29395413399edaec3e20fcca7205fb19776ed8ddb25d6f427ec40e"].into(),
+			array_bytes::hex_n_into_unchecked("c8dc79e36b29395413399edaec3e20fcca7205fb19776ed8ddb25d6f427ec40e"),
 			// 5EockCXN6YkiNCDjpqqnbcqd4ad35nU4RmA1ikM4YeRN4WcE
-			hex!["7932cff431e748892fa48e10c63c17d30f80ca42e4de3921e641249cd7fa3c2f"]
+			array_bytes::hex2array_unchecked("7932cff431e748892fa48e10c63c17d30f80ca42e4de3921e641249cd7fa3c2f")
 				.unchecked_into(),
 			// 5DhLtiaQd1L1LU9jaNeeu9HJkP6eyg3BwXA7iNMzKm7qqruQ
-			hex!["482dbd7297a39fa145c570552249c2ca9dd47e281f0c500c971b59c9dcdcd82e"]
+			array_bytes::hex2array_unchecked("482dbd7297a39fa145c570552249c2ca9dd47e281f0c500c971b59c9dcdcd82e")
 				.unchecked_into(),
 			// 5DhLtiaQd1L1LU9jaNeeu9HJkP6eyg3BwXA7iNMzKm7qqruQ
-			hex!["482dbd7297a39fa145c570552249c2ca9dd47e281f0c500c971b59c9dcdcd82e"]
+			array_bytes::hex2array_unchecked("482dbd7297a39fa145c570552249c2ca9dd47e281f0c500c971b59c9dcdcd82e")
 				.unchecked_into(),
 			// 5DhLtiaQd1L1LU9jaNeeu9HJkP6eyg3BwXA7iNMzKm7qqruQ
-			hex!["482dbd7297a39fa145c570552249c2ca9dd47e281f0c500c971b59c9dcdcd82e"]
+			array_bytes::hex2array_unchecked("482dbd7297a39fa145c570552249c2ca9dd47e281f0c500c971b59c9dcdcd82e")
 				.unchecked_into(),
 		),
 		(
 			// 5DyVtKWPidondEu8iHZgi6Ffv9yrJJ1NDNLom3X9cTDi98qp
-			hex!["547ff0ab649283a7ae01dbc2eb73932eba2fb09075e9485ff369082a2ff38d65"].into(),
+			array_bytes::hex_n_into_unchecked("547ff0ab649283a7ae01dbc2eb73932eba2fb09075e9485ff369082a2ff38d65"),
 			// 5FeD54vGVNpFX3PndHPXJ2MDakc462vBCD5mgtWRnWYCpZU9
-			hex!["9e42241d7cd91d001773b0b616d523dd80e13c6c2cab860b1234ef1b9ffc1526"].into(),
+			array_bytes::hex_n_into_unchecked("9e42241d7cd91d001773b0b616d523dd80e13c6c2cab860b1234ef1b9ffc1526"),
 			// 5E1jLYfLdUQKrFrtqoKgFrRvxM3oQPMbf6DfcsrugZZ5Bn8d
-			hex!["5633b70b80a6c8bb16270f82cca6d56b27ed7b76c8fd5af2986a25a4788ce440"]
+			array_bytes::hex2array_unchecked("5633b70b80a6c8bb16270f82cca6d56b27ed7b76c8fd5af2986a25a4788ce440")
 				.unchecked_into(),
 			// 5DhKqkHRkndJu8vq7pi2Q5S3DfftWJHGxbEUNH43b46qNspH
-			hex!["482a3389a6cf42d8ed83888cfd920fec738ea30f97e44699ada7323f08c3380a"]
+			array_bytes::hex2array_unchecked("482a3389a6cf42d8ed83888cfd920fec738ea30f97e44699ada7323f08c3380a")
 				.unchecked_into(),
 			// 5DhKqkHRkndJu8vq7pi2Q5S3DfftWJHGxbEUNH43b46qNspH
-			hex!["482a3389a6cf42d8ed83888cfd920fec738ea30f97e44699ada7323f08c3380a"]
+			array_bytes::hex2array_unchecked("482a3389a6cf42d8ed83888cfd920fec738ea30f97e44699ada7323f08c3380a")
 				.unchecked_into(),
 			// 5DhKqkHRkndJu8vq7pi2Q5S3DfftWJHGxbEUNH43b46qNspH
-			hex!["482a3389a6cf42d8ed83888cfd920fec738ea30f97e44699ada7323f08c3380a"]
+			array_bytes::hex2array_unchecked("482a3389a6cf42d8ed83888cfd920fec738ea30f97e44699ada7323f08c3380a")
 				.unchecked_into(),
 		),
 		(
 			// 5HYZnKWe5FVZQ33ZRJK1rG3WaLMztxWrrNDb1JRwaHHVWyP9
-			hex!["f26cdb14b5aec7b2789fd5ca80f979cef3761897ae1f37ffb3e154cbcc1c2663"].into(),
+			array_bytes::hex_n_into_unchecked("f26cdb14b5aec7b2789fd5ca80f979cef3761897ae1f37ffb3e154cbcc1c2663"),
 			// 5EPQdAQ39WQNLCRjWsCk5jErsCitHiY5ZmjfWzzbXDoAoYbn
-			hex!["66bc1e5d275da50b72b15de072a2468a5ad414919ca9054d2695767cf650012f"].into(),
+			array_bytes::hex_n_into_unchecked("66bc1e5d275da50b72b15de072a2468a5ad414919ca9054d2695767cf650012f"),
 			// 5DMa31Hd5u1dwoRKgC4uvqyrdK45RHv3CpwvpUC1EzuwDit4
-			hex!["3919132b851ef0fd2dae42a7e734fe547af5a6b809006100f48944d7fae8e8ef"]
+			array_bytes::hex2array_unchecked("3919132b851ef0fd2dae42a7e734fe547af5a6b809006100f48944d7fae8e8ef")
 				.unchecked_into(),
 			// 5C4vDQxA8LTck2xJEy4Yg1hM9qjDt4LvTQaMo4Y8ne43aU6x
-			hex!["00299981a2b92f878baaf5dbeba5c18d4e70f2a1fcd9c61b32ea18daf38f4378"]
+			array_bytes::hex2array_unchecked("00299981a2b92f878baaf5dbeba5c18d4e70f2a1fcd9c61b32ea18daf38f4378")
 				.unchecked_into(),
 			// 5C4vDQxA8LTck2xJEy4Yg1hM9qjDt4LvTQaMo4Y8ne43aU6x
-			hex!["00299981a2b92f878baaf5dbeba5c18d4e70f2a1fcd9c61b32ea18daf38f4378"]
+			array_bytes::hex2array_unchecked("00299981a2b92f878baaf5dbeba5c18d4e70f2a1fcd9c61b32ea18daf38f4378")
 				.unchecked_into(),
 			// 5C4vDQxA8LTck2xJEy4Yg1hM9qjDt4LvTQaMo4Y8ne43aU6x
-			hex!["00299981a2b92f878baaf5dbeba5c18d4e70f2a1fcd9c61b32ea18daf38f4378"]
+			array_bytes::hex2array_unchecked("00299981a2b92f878baaf5dbeba5c18d4e70f2a1fcd9c61b32ea18daf38f4378")
 				.unchecked_into(),
 		),
 	];

 	// generated with secret: subkey inspect "$secret"/fir
-	let root_key: AccountId = hex![
+	let root_key: AccountId = array_bytes::hex_n_into_unchecked(
 		// 5Ff3iXP75ruzroPWRP2FYBHWnmGGBSb63857BgnzCoXNxfPo
-		"9ee5e5bdc0ec239eb164f865ecc345ce4c88e76ee002e0f7e318097347471809"
-	]
-	.into();
+		"9ee5e5bdc0ec239eb164f865ecc345ce4c88e76ee002e0f7e318097347471809",
+	);

 	let endowed_accounts: Vec<AccountId> = vec![root_key.clone()];

@@ -21,7 +21,6 @@ codec = { package = "parity-scale-codec", version = "3.0.0", default-features =
 ] }
 scale-info = { version = "2.1.1", default-features = false, features = ["derive"] }
 static_assertions = "1.1.0"
-hex-literal = { version = "0.3.4", optional = true }
 log = { version = "0.4.17", default-features = false }

 # primitives
@@ -252,7 +251,6 @@ runtime-benchmarks = [
 	"pallet-vesting/runtime-benchmarks",
 	"pallet-whitelist/runtime-benchmarks",
 	"frame-system-benchmarking/runtime-benchmarks",
-	"hex-literal",
 ]
 try-runtime = [
 	"frame-try-runtime",
@@ -9,12 +9,12 @@ description = "BEEFY Client gadget for substrate"
 homepage = "https://substrate.io"

 [dependencies]
+array-bytes = "4.1"
 async-trait = "0.1.57"
 codec = { package = "parity-scale-codec", version = "3.0.0", features = ["derive"] }
 fnv = "1.0.6"
 futures = "0.3"
 futures-timer = "3.0.1"
-hex = "0.4.2"
 log = "0.4"
 parking_lot = "0.12.1"
 thiserror = "1.0"
@@ -69,9 +69,10 @@ pub(crate) mod beefy_protocol_name {
 		genesis_hash: &Hash,
 		chain_spec: &Box<dyn ChainSpec>,
 	) -> ProtocolName {
+		let genesis_hash = genesis_hash.as_ref();
 		let chain_prefix = match chain_spec.fork_id() {
-			Some(fork_id) => format!("/{}/{}", hex::encode(genesis_hash), fork_id),
-			None => format!("/{}", hex::encode(genesis_hash)),
+			Some(fork_id) => format!("/{}/{}", array_bytes::bytes2hex("", genesis_hash), fork_id),
+			None => format!("/{}", array_bytes::bytes2hex("", genesis_hash)),
 		};
 		format!("{}{}", chain_prefix, NAME).into()
 	}
@@ -99,7 +99,7 @@ fn beefy_protocol_name() {

 	// Create protocol name using random genesis hash.
 	let genesis_hash = H256::random();
-	let expected = format!("/{}/beefy/1", hex::encode(genesis_hash));
+	let expected = format!("/{}/beefy/1", array_bytes::bytes2hex("", genesis_hash.as_ref()));
 	let proto_name = beefy_protocol_name::standard_name(&genesis_hash, &chain_spec);
 	assert_eq!(proto_name.to_string(), expected);

@@ -13,11 +13,11 @@ readme = "README.md"
 targets = ["x86_64-unknown-linux-gnu"]

 [dependencies]
+array-bytes = "4.1"
 chrono = "0.4.10"
 clap = { version = "3.1.18", features = ["derive"] }
 fdlimit = "0.2.1"
 futures = "0.3.21"
-hex = "0.4.2"
 libp2p = "0.46.1"
 log = "0.4.17"
 names = { version = "0.13.0", default-features = false }
@@ -57,7 +57,7 @@ impl GenerateNodeKeyCmd {
 		let file_data = if self.bin {
 			secret.as_ref().to_owned()
 		} else {
-			hex::encode(secret.as_ref()).into_bytes()
+			array_bytes::bytes2hex("", secret.as_ref()).into_bytes()
 		};

 		match &self.file {
@@ -85,6 +85,6 @@ mod tests {
 		assert!(generate.run().is_ok());
 		let mut buf = String::new();
 		assert!(file.read_to_string(&mut buf).is_ok());
-		assert!(hex::decode(buf).is_ok());
+		assert!(array_bytes::hex2bytes(&buf).is_ok());
 	}
 }
@@ -127,7 +127,7 @@ fn expect_public_from_phrase<Pair: sp_core::Pair>(
 ) -> Result<(), Error> {
 	let secret_uri = SecretUri::from_str(suri).map_err(|e| format!("{:?}", e))?;
 	let expected_public = if let Some(public) = expect_public.strip_prefix("0x") {
-		let hex_public = hex::decode(&public)
+		let hex_public = array_bytes::hex2bytes(public)
 			.map_err(|_| format!("Invalid expected public key hex: `{}`", expect_public))?;
 		Pair::Public::try_from(&hex_public)
 			.map_err(|_| format!("Invalid expected public key: `{}`", expect_public))?
@@ -208,7 +208,7 @@ mod tests {
 			.expect("Valid")
 			.0
 			.public();
-		let valid_public_hex = format!("0x{}", hex::encode(valid_public.as_slice()));
+		let valid_public_hex = array_bytes::bytes2hex("0x", valid_public.as_slice());
 		let valid_accountid = format!("{}", valid_public.into_account());

 		// It should fail with the invalid public key
@@ -226,7 +226,7 @@ mod tests {
 				.0
 				.public();
 		let valid_public_hex_with_password =
-			format!("0x{}", hex::encode(&valid_public_with_password.as_slice()));
+			array_bytes::bytes2hex("0x", valid_public_with_password.as_slice());
 		let valid_accountid_with_password =
 			format!("{}", &valid_public_with_password.into_account());

@@ -248,7 +248,7 @@ mod tests {
 			.0
 			.public();
 		let valid_public_hex_with_password_and_derivation =
-			format!("0x{}", hex::encode(&valid_public_with_password_and_derivation.as_slice()));
+			array_bytes::bytes2hex("0x", valid_public_with_password_and_derivation.as_slice());

 		// They should still be valid, because we check the base secret key.
 		check_cmd(&seed_with_password_and_derivation, &valid_public_hex_with_password, true);
@@ -66,7 +66,8 @@ impl InspectNodeKeyCmd {
 		if !self.bin {
 			// With hex input, give to the user a bit of tolerance about whitespaces
 			let keyhex = String::from_utf8_lossy(&file_data);
-			file_data = hex::decode(keyhex.trim()).map_err(|_| "failed to decode secret as hex")?;
+			file_data = array_bytes::hex2bytes(keyhex.trim())
+				.map_err(|_| "failed to decode secret as hex")?;
 		}

 		let secret =
@@ -70,7 +70,7 @@ fn sign<P: sp_core::Pair>(
 	message: Vec<u8>,
 ) -> error::Result<String> {
 	let pair = utils::pair_from_suri::<P>(suri, password)?;
-	Ok(hex::encode(pair.sign(&message)))
+	Ok(array_bytes::bytes2hex("", pair.sign(&message).as_ref()))
 }

 #[cfg(test)]
@@ -203,7 +203,7 @@ where
 	Pair: sp_core::Pair,
 	Pair::Public: Into<MultiSigner>,
 {
-	let public = decode_hex(public_str)?;
+	let public = array_bytes::hex2bytes(public_str)?;

 	let public_key = Pair::Public::try_from(&public)
 		.map_err(|_| "Failed to construct public key from given hex")?;
@@ -273,26 +273,17 @@ where
 	format!("0x{}", HexDisplay::from(&public_key.into().into_account().as_ref()))
 }

-/// helper method for decoding hex
-pub fn decode_hex<T: AsRef<[u8]>>(message: T) -> Result<Vec<u8>, Error> {
-	let mut message = message.as_ref();
-	if message[..2] == [b'0', b'x'] {
-		message = &message[2..]
-	}
-	Ok(hex::decode(message)?)
-}
-
 /// checks if message is Some, otherwise reads message from stdin and optionally decodes hex
 pub fn read_message(msg: Option<&String>, should_decode: bool) -> Result<Vec<u8>, Error> {
 	let mut message = vec![];
 	match msg {
 		Some(m) => {
-			message = decode_hex(m)?;
+			message = array_bytes::hex2bytes(m.as_str())?;
 		},
 		None => {
 			std::io::stdin().lock().read_to_end(&mut message)?;
 			if should_decode {
-				message = decode_hex(&message)?;
+				message = array_bytes::hex2bytes(array_bytes::hex_bytes2hex_str(&message)?)?;
 			}
 		},
 	}
@@ -178,7 +178,7 @@ mod tests {
 	#[test]
 	fn test_generation_with_single_char() {
 		let seed = generate_key::<sr25519::Pair>("ab", default_ss58_version()).unwrap();
-		assert!(sr25519::Pair::from_seed_slice(&hex::decode(&seed[2..]).unwrap())
+		assert!(sr25519::Pair::from_seed_slice(&array_bytes::hex2bytes_unchecked(&seed))
 			.unwrap()
 			.public()
 			.to_ss58check()
@@ -190,7 +190,7 @@ mod tests {
 		let seed =
 			generate_key::<sr25519::Pair>("ab", Ss58AddressFormatRegistry::PolkadotAccount.into())
 				.unwrap();
-		assert!(sr25519::Pair::from_seed_slice(&hex::decode(&seed[2..]).unwrap())
+		assert!(sr25519::Pair::from_seed_slice(&array_bytes::hex2bytes_unchecked(&seed))
 			.unwrap()
 			.public()
 			.to_ss58check_with_version(Ss58AddressFormatRegistry::PolkadotAccount.into())
@@ -55,7 +55,7 @@ impl VerifyCmd {
 	/// Run the command
 	pub fn run(&self) -> error::Result<()> {
 		let message = utils::read_message(self.message.as_ref(), self.hex)?;
-		let sig_data = utils::decode_hex(&self.sig)?;
+		let sig_data = array_bytes::hex2bytes(&self.sig)?;
 		let uri = utils::read_uri(self.uri.as_ref())?;
 		let uri = if let Some(uri) = uri.strip_prefix("0x") { uri } else { &uri };

@@ -71,7 +71,7 @@ where
 	let signature =
 		Pair::Signature::try_from(&sig_data).map_err(|_| error::Error::SignatureFormatInvalid)?;

-	let pubkey = if let Ok(pubkey_vec) = hex::decode(uri) {
+	let pubkey = if let Ok(pubkey_vec) = array_bytes::hex2bytes(uri) {
 		Pair::Public::from_slice(pubkey_vec.as_slice())
 			.map_err(|_| error::Error::KeyFormatInvalid)?
 	} else {
@@ -69,8 +69,8 @@ pub enum Error {
 	#[error("Key storage issue encountered")]
 	KeyStorage(#[from] sc_keystore::Error),

-	#[error("Invalid hexadecimal string data")]
-	HexDataConversion(#[from] hex::FromHexError),
+	#[error("Invalid hexadecimal string data, {0:?}")]
+	HexDataConversion(array_bytes::Error),

 	/// Application specific error chain sequence forwarder.
 	#[error(transparent)]
@@ -97,3 +97,9 @@ impl From<crypto::PublicError> for Error {
 		Error::InvalidUri(e)
 	}
 }
+
+impl From<array_bytes::Error> for Error {
+	fn from(e: array_bytes::Error) -> Error {
+		Error::HexDataConversion(e)
+	}
+}
@@ -176,7 +176,7 @@ mod tests {
 		let file = tmp.path().join("mysecret").to_path_buf();
 		let key = ed25519::SecretKey::generate();

-		fs::write(&file, hex::encode(key.as_ref())).expect("Writes secret key");
+		fs::write(&file, array_bytes::bytes2hex("", key.as_ref())).expect("Writes secret key");
 		check_key(file.clone(), &key);

 		fs::write(&file, &key).expect("Writes secret key");
@@ -37,8 +37,8 @@ sp-version = { version = "5.0.0", path = "../../primitives/version" }
 sp-wasm-interface = { version = "6.0.0", path = "../../primitives/wasm-interface" }

 [dev-dependencies]
+array-bytes = "4.1"
 wat = "1.0"
-hex-literal = "0.3.4"
 sc-runtime-test = { version = "2.0.0", path = "runtime-test" }
 substrate-test-runtime = { version = "2.0.0", path = "../../test-utils/runtime" }
 sp-state-machine = { version = "0.12.0", path = "../../primitives/state-machine" }
@@ -21,7 +21,6 @@ mod linux;
 mod sandbox;

 use codec::{Decode, Encode};
-use hex_literal::hex;
 use sc_executor_common::{error::Error, runtime_blob::RuntimeBlob, wasm_runtime::WasmModule};
 use sc_runtime_test::wasm_binary_unwrap;
 use sp_core::{
@@ -391,16 +390,18 @@ fn sha2_256_should_work(wasm_method: WasmExecutionMethod) {
 	let mut ext = ext.ext();
 	assert_eq!(
 		call_in_wasm("test_sha2_256", &[0], wasm_method, &mut ext,).unwrap(),
-		hex!("e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855")
-			.to_vec()
-			.encode(),
+		array_bytes::hex2bytes_unchecked(
+			"e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
+		)
+		.encode(),
 	);
 	assert_eq!(
 		call_in_wasm("test_sha2_256", &b"Hello world!".to_vec().encode(), wasm_method, &mut ext,)
 			.unwrap(),
-		hex!("c0535e4be2b79ffd93291305436bf889314e4a3faec05ecffcbb7df31ad9e51a")
-			.to_vec()
-			.encode(),
+		array_bytes::hex2bytes_unchecked(
+			"c0535e4be2b79ffd93291305436bf889314e4a3faec05ecffcbb7df31ad9e51a"
+		)
+		.encode(),
 	);
 }

@@ -410,16 +411,18 @@ fn twox_256_should_work(wasm_method: WasmExecutionMethod) {
 	let mut ext = ext.ext();
 	assert_eq!(
 		call_in_wasm("test_twox_256", &[0], wasm_method, &mut ext,).unwrap(),
-		hex!("99e9d85137db46ef4bbea33613baafd56f963c64b1f3685a4eb4abd67ff6203a")
-			.to_vec()
-			.encode(),
+		array_bytes::hex2bytes_unchecked(
+			"99e9d85137db46ef4bbea33613baafd56f963c64b1f3685a4eb4abd67ff6203a"
+		)
+		.encode(),
 	);
 	assert_eq!(
 		call_in_wasm("test_twox_256", &b"Hello world!".to_vec().encode(), wasm_method, &mut ext,)
 			.unwrap(),
-		hex!("b27dfd7f223f177f2a13647b533599af0c07f68bda23d96d059da2b451a35a74")
-			.to_vec()
-			.encode(),
+		array_bytes::hex2bytes_unchecked(
+			"b27dfd7f223f177f2a13647b533599af0c07f68bda23d96d059da2b451a35a74"
+		)
+		.encode(),
 	);
 }

@@ -429,12 +432,12 @@ fn twox_128_should_work(wasm_method: WasmExecutionMethod) {
 	let mut ext = ext.ext();
 	assert_eq!(
 		call_in_wasm("test_twox_128", &[0], wasm_method, &mut ext,).unwrap(),
-		hex!("99e9d85137db46ef4bbea33613baafd5").to_vec().encode(),
+		array_bytes::hex2bytes_unchecked("99e9d85137db46ef4bbea33613baafd5").encode(),
 	);
 	assert_eq!(
 		call_in_wasm("test_twox_128", &b"Hello world!".to_vec().encode(), wasm_method, &mut ext,)
 			.unwrap(),
-		hex!("b27dfd7f223f177f2a13647b533599af").to_vec().encode(),
+		array_bytes::hex2bytes_unchecked("b27dfd7f223f177f2a13647b533599af").encode(),
 	);
 }

@@ -704,7 +707,7 @@ fn parallel_execution(wasm_method: WasmExecutionMethod) {
 							&[0],
 						)
 						.unwrap(),
-					hex!("99e9d85137db46ef4bbea33613baafd5").to_vec().encode(),
+					array_bytes::hex2bytes_unchecked("99e9d85137db46ef4bbea33613baafd5").encode()
 				);
 			})
 		})
@@ -15,12 +15,12 @@ targets = ["x86_64-unknown-linux-gnu"]

 [dependencies]
 ahash = "0.7.6"
+array-bytes = "4.1"
 async-trait = "0.1.57"
 dyn-clone = "1.0"
 finality-grandpa = { version = "0.16.0", features = ["derive-codec"] }
 futures = "0.3.21"
 futures-timer = "3.0.1"
-hex = "0.4.2"
 log = "0.4.17"
 parity-scale-codec = { version = "3.0.0", features = ["derive"] }
 parking_lot = "0.12.1"
@@ -83,9 +83,10 @@ pub mod grandpa_protocol_name {
 		genesis_hash: &Hash,
 		chain_spec: &Box<dyn ChainSpec>,
 	) -> ProtocolName {
+		let genesis_hash = genesis_hash.as_ref();
 		let chain_prefix = match chain_spec.fork_id() {
-			Some(fork_id) => format!("/{}/{}", hex::encode(genesis_hash), fork_id),
-			None => format!("/{}", hex::encode(genesis_hash)),
+			Some(fork_id) => format!("/{}/{}", array_bytes::bytes2hex("", genesis_hash), fork_id),
+			None => format!("/{}", array_bytes::bytes2hex("", genesis_hash)),
 		};
 		format!("{}{}", chain_prefix, NAME).into()
 	}
@@ -646,7 +646,7 @@ fn grandpa_protocol_name() {

 	// Create protocol name using random genesis hash.
 	let genesis_hash = sp_core::H256::random();
-	let expected = format!("/{}/grandpa/1", hex::encode(genesis_hash));
+	let expected = format!("/{}/grandpa/1", array_bytes::bytes2hex("", genesis_hash.as_ref()));
 	let proto_name = grandpa_protocol_name::standard_name(&genesis_hash, &chain_spec);
 	assert_eq!(proto_name.to_string(), expected);

@@ -14,8 +14,8 @@ readme = "README.md"
 targets = ["x86_64-unknown-linux-gnu"]

 [dependencies]
+array-bytes = "4.1"
 async-trait = "0.1.57"
-hex = "0.4.0"
 parking_lot = "0.12.1"
 serde_json = "1.0.85"
 thiserror = "1.0"
@@ -512,8 +512,8 @@ impl KeystoreInner {
 	/// Returns `None` if the keystore only exists in-memory and there isn't any path to provide.
 	fn key_file_path(&self, public: &[u8], key_type: KeyTypeId) -> Option<PathBuf> {
 		let mut buf = self.path.as_ref()?.clone();
-		let key_type = hex::encode(key_type.0);
-		let key = hex::encode(public);
+		let key_type = array_bytes::bytes2hex("", &key_type.0);
+		let key = array_bytes::bytes2hex("", public);
 		buf.push(key_type + key.as_str());
 		Some(buf)
 	}
@@ -534,7 +534,7 @@ impl KeystoreInner {

 				// skip directories and non-unicode file names (hex is unicode)
 				if let Some(name) = path.file_name().and_then(|n| n.to_str()) {
-					match hex::decode(name) {
+					match array_bytes::hex2bytes(name) {
 						Ok(ref hex) if hex.len() > 4 => {
 							if hex[0..4] != id.0 {
 								continue
@@ -739,7 +739,7 @@ mod tests {
 		let temp_dir = TempDir::new().unwrap();
 		let store = LocalKeystore::open(temp_dir.path(), None).unwrap();

-		let file_name = temp_dir.path().join(hex::encode(&SR25519.0[..2]));
+		let file_name = temp_dir.path().join(array_bytes::bytes2hex("", &SR25519.0[..2]));
 		fs::write(file_name, "test").expect("Invalid file is written");

 		assert!(SyncCryptoStore::sr25519_public_keys(&store, SR25519).is_empty());
@@ -14,6 +14,7 @@ readme = "README.md"
 targets = ["x86_64-unknown-linux-gnu"]

 [dependencies]
+array-bytes = "4.1"
 async-trait = "0.1"
 asynchronous-codec = "0.6"
 bitflags = "1.3.2"
@@ -24,7 +25,6 @@ either = "1.5.3"
 fnv = "1.0.6"
 futures = "0.3.21"
 futures-timer = "3.0.2"
-hex = "0.4.0"
 ip_network = "0.4.1"
 libp2p = "0.46.1"
 linked_hash_set = "0.1.3"
@@ -17,11 +17,11 @@ targets = ["x86_64-unknown-linux-gnu"]
 prost-build = "0.10"

 [dependencies]
+array-bytes = "4.1"
 codec = { package = "parity-scale-codec", version = "3.0.0", features = [
    "derive",
 ] }
 futures = "0.3.21"
-hex = "0.4.0"
 libp2p = "0.46.1"
 log = "0.4.16"
 prost = "0.10"
@@ -27,10 +27,11 @@ use std::time::Duration;

 /// Generate the light client protocol name from the genesis hash and fork id.
 fn generate_protocol_name<Hash: AsRef<[u8]>>(genesis_hash: Hash, fork_id: Option<&str>) -> String {
+	let genesis_hash = genesis_hash.as_ref();
 	if let Some(fork_id) = fork_id {
-		format!("/{}/{}/light/2", hex::encode(genesis_hash), fork_id)
+		format!("/{}/{}/light/2", array_bytes::bytes2hex("", genesis_hash), fork_id)
 	} else {
-		format!("/{}/light/2", hex::encode(genesis_hash))
+		format!("/{}/light/2", array_bytes::bytes2hex("", genesis_hash))
 	}
 }

@@ -585,7 +585,7 @@ impl NodeKeyConfig {
 				f,
 				|mut b| match String::from_utf8(b.to_vec()).ok().and_then(|s| {
 					if s.len() == 64 {
-						hex::decode(&s).ok()
+						array_bytes::hex2bytes(&s).ok()
 					} else {
 						None
 					}
@@ -369,10 +369,15 @@ where
 		let block_announces_protocol = {
 			let genesis_hash =
 				chain.hash(0u32.into()).ok().flatten().expect("Genesis block exists; qed");
+			let genesis_hash = genesis_hash.as_ref();
 			if let Some(fork_id) = fork_id {
-				format!("/{}/{}/block-announces/1", hex::encode(genesis_hash), fork_id)
+				format!(
+					"/{}/{}/block-announces/1",
+					array_bytes::bytes2hex("", genesis_hash),
+					fork_id
+				)
 			} else {
-				format!("/{}/block-announces/1", hex::encode(genesis_hash))
+				format!("/{}/block-announces/1", array_bytes::bytes2hex("", genesis_hash))
 			}
 		};

@@ -143,10 +143,11 @@ impl TransactionsHandlerPrototype {
 		genesis_hash: Hash,
 		fork_id: Option<String>,
 	) -> Self {
+		let genesis_hash = genesis_hash.as_ref();
 		let protocol_name = if let Some(fork_id) = fork_id {
-			format!("/{}/{}/transactions/1", hex::encode(genesis_hash), fork_id)
+			format!("/{}/{}/transactions/1", array_bytes::bytes2hex("", genesis_hash), fork_id)
 		} else {
-			format!("/{}/transactions/1", hex::encode(genesis_hash))
+			format!("/{}/transactions/1", array_bytes::bytes2hex("", genesis_hash))
 		};
 		let legacy_protocol_name = format!("/{}/transactions/1", protocol_id.as_ref());

@@ -17,11 +17,11 @@ targets = ["x86_64-unknown-linux-gnu"]
 prost-build = "0.10"

 [dependencies]
+array-bytes = "4.1"
 codec = { package = "parity-scale-codec", version = "3.0.0", features = [
 	"derive",
 ] }
 futures = "0.3.21"
-hex = "0.4.0"
 libp2p = "0.46.1"
 log = "0.4.17"
 lru = "0.7.5"
@@ -80,10 +80,11 @@ pub fn generate_protocol_config<Hash: AsRef<[u8]>>(

 /// Generate the block protocol name from the genesis hash and fork id.
 fn generate_protocol_name<Hash: AsRef<[u8]>>(genesis_hash: Hash, fork_id: Option<&str>) -> String {
+	let genesis_hash = genesis_hash.as_ref();
 	if let Some(fork_id) = fork_id {
-		format!("/{}/{}/sync/2", hex::encode(genesis_hash), fork_id)
+		format!("/{}/{}/sync/2", array_bytes::bytes2hex("", genesis_hash), fork_id)
 	} else {
-		format!("/{}/sync/2", hex::encode(genesis_hash))
+		format!("/{}/sync/2", array_bytes::bytes2hex("", genesis_hash))
 	}
 }

@@ -69,10 +69,11 @@ pub fn generate_protocol_config<Hash: AsRef<[u8]>>(

 /// Generate the state protocol name from the genesis hash and fork id.
 fn generate_protocol_name<Hash: AsRef<[u8]>>(genesis_hash: Hash, fork_id: Option<&str>) -> String {
+	let genesis_hash = genesis_hash.as_ref();
 	if let Some(fork_id) = fork_id {
-		format!("/{}/{}/state/2", hex::encode(genesis_hash), fork_id)
+		format!("/{}/{}/state/2", array_bytes::bytes2hex("", genesis_hash), fork_id)
 	} else {
-		format!("/{}/state/2", hex::encode(genesis_hash))
+		format!("/{}/state/2", array_bytes::bytes2hex("", genesis_hash))
 	}
 }

@@ -54,10 +54,11 @@ pub fn generate_request_response_config<Hash: AsRef<[u8]>>(

 /// Generate the grandpa warp sync protocol name from the genesi hash and fork id.
 fn generate_protocol_name<Hash: AsRef<[u8]>>(genesis_hash: Hash, fork_id: Option<&str>) -> String {
+	let genesis_hash = genesis_hash.as_ref();
 	if let Some(fork_id) = fork_id {
-		format!("/{}/{}/sync/warp", hex::encode(genesis_hash), fork_id)
+		format!("/{}/{}/sync/warp", array_bytes::bytes2hex("", genesis_hash), fork_id)
 	} else {
-		format!("/{}/sync/warp", hex::encode(genesis_hash))
+		format!("/{}/sync/warp", array_bytes::bytes2hex("", genesis_hash))
 	}
 }

@@ -13,12 +13,12 @@ readme = "README.md"
 targets = ["x86_64-unknown-linux-gnu"]

 [dependencies]
+array-bytes = "4.1"
 bytes = "1.1"
 codec = { package = "parity-scale-codec", version = "3.0.0", features = ["derive"] }
 fnv = "1.0.6"
 futures = "0.3.21"
 futures-timer = "3.0.2"
-hex = "0.4"
 hyper = { version = "0.14.16", features = ["stream", "http2"] }
 hyper-rustls = { version = "0.23.0", features = ["http2"] }
 libp2p = { version = "0.46.1", default-features = false }
@@ -79,8 +79,8 @@ impl<Storage: OffchainStorage> offchain::DbExternalities for Db<Storage> {
 		tracing::debug!(
 			target: "offchain-worker::storage",
 			?kind,
-			key = ?hex::encode(key),
-			value = ?hex::encode(value),
+			key = ?array_bytes::bytes2hex("", key),
+			value = ?array_bytes::bytes2hex("", value),
 			"Write",
 		);
 		match kind {
@@ -93,7 +93,7 @@ impl<Storage: OffchainStorage> offchain::DbExternalities for Db<Storage> {
 		tracing::debug!(
 			target: "offchain-worker::storage",
 			?kind,
-			key = ?hex::encode(key),
+			key = ?array_bytes::bytes2hex("", key),
 			"Clear",
 		);
 		match kind {
@@ -112,9 +112,9 @@ impl<Storage: OffchainStorage> offchain::DbExternalities for Db<Storage> {
 		tracing::debug!(
 			target: "offchain-worker::storage",
 			?kind,
-			key = ?hex::encode(key),
-			new_value = ?hex::encode(new_value),
-			old_value = ?old_value.as_ref().map(hex::encode),
+			key = ?array_bytes::bytes2hex("", key),
+			new_value = ?array_bytes::bytes2hex("", new_value),
+			old_value = ?old_value.as_ref().map(|s| array_bytes::bytes2hex("", s)),
 			"CAS",
 		);
 		match kind {
@@ -132,8 +132,8 @@ impl<Storage: OffchainStorage> offchain::DbExternalities for Db<Storage> {
 		tracing::debug!(
 			target: "offchain-worker::storage",
 			?kind,
-			key = ?hex::encode(key),
-			result = ?result.as_ref().map(hex::encode),
+			key = ?array_bytes::bytes2hex("", key),
+			result = ?result.as_ref().map(|s| array_bytes::bytes2hex("", s)),
 			"Read",
 		);
 		result
@@ -12,10 +12,9 @@ repository = "https://github.com/paritytech/substrate/"
 targets = ["x86_64-unknown-linux-gnu"]

 [dependencies]
+array-bytes = "4.1"
 fdlimit = "0.2.1"
 futures = "0.3.21"
-hex = "0.4"
-hex-literal = "0.3.4"
 log = "0.4.17"
 parity-scale-codec = "3.0.0"
 parking_lot = "0.12.1"
@@ -17,7 +17,6 @@
 // along with this program. If not, see <https://www.gnu.org/licenses/>.

 use futures::executor::block_on;
-use hex_literal::hex;
 use parity_scale_codec::{Decode, Encode, Joiner};
 use sc_block_builder::BlockBuilderProvider;
 use sc_client_api::{
@@ -155,7 +154,9 @@ fn block1(genesis_hash: Hash, backend: &InMemoryBackend<BlakeTwo256>) -> (Vec<u8
 		backend,
 		1,
 		genesis_hash,
-		hex!("25e5b37074063ab75c889326246640729b40d0c86932edc527bc80db0e04fe5c").into(),
+		array_bytes::hex_n_into_unchecked(
+			"25e5b37074063ab75c889326246640729b40d0c86932edc527bc80db0e04fe5c",
+		),
 		vec![Transfer {
 			from: AccountKeyring::One.into(),
 			to: AccountKeyring::Two.into(),
@@ -1594,7 +1595,7 @@ fn storage_keys_iter_prefix_and_start_key_works() {
 		.build();

 	let child_root = b":child_storage:default:child".to_vec();
-	let prefix = StorageKey(hex!("3a").to_vec());
+	let prefix = StorageKey(array_bytes::hex2bytes_unchecked("3a"));
 	let child_prefix = StorageKey(b"sec".to_vec());

 	let res: Vec<_> = client
@@ -1604,25 +1605,29 @@ fn storage_keys_iter_prefix_and_start_key_works() {
 		.collect();
 	assert_eq!(
 		res,
-		[child_root.clone(), hex!("3a636f6465").to_vec(), hex!("3a686561707061676573").to_vec(),]
+		[
+			child_root.clone(),
+			array_bytes::hex2bytes_unchecked("3a636f6465"),
+			array_bytes::hex2bytes_unchecked("3a686561707061676573"),
+		]
 	);

 	let res: Vec<_> = client
 		.storage_keys_iter(
 			&BlockId::Number(0),
 			Some(&prefix),
-			Some(&StorageKey(hex!("3a636f6465").to_vec())),
+			Some(&StorageKey(array_bytes::hex2bytes_unchecked("3a636f6465"))),
 		)
 		.unwrap()
 		.map(|x| x.0)
 		.collect();
-	assert_eq!(res, [hex!("3a686561707061676573").to_vec()]);
+	assert_eq!(res, [array_bytes::hex2bytes_unchecked("3a686561707061676573")]);

 	let res: Vec<_> = client
 		.storage_keys_iter(
 			&BlockId::Number(0),
 			Some(&prefix),
-			Some(&StorageKey(hex!("3a686561707061676573").to_vec())),
+			Some(&StorageKey(array_bytes::hex2bytes_unchecked("3a686561707061676573"))),
 		)
 		.unwrap()
 		.map(|x| x.0)
@@ -1653,13 +1658,13 @@ fn storage_keys_iter_prefix_and_start_key_works() {
 fn storage_keys_iter_works() {
 	let client = substrate_test_runtime_client::new();

-	let prefix = StorageKey(hex!("").to_vec());
+	let prefix = StorageKey(array_bytes::hex2bytes_unchecked(""));

 	let res: Vec<_> = client
 		.storage_keys_iter(&BlockId::Number(0), Some(&prefix), None)
 		.unwrap()
 		.take(8)
-		.map(|x| hex::encode(&x.0))
+		.map(|x| array_bytes::bytes2hex("", &x.0))
 		.collect();
 	assert_eq!(
 		res,
@@ -1679,11 +1684,11 @@ fn storage_keys_iter_works() {
 		.storage_keys_iter(
 			&BlockId::Number(0),
 			Some(&prefix),
-			Some(&StorageKey(hex!("3a636f6465").to_vec())),
+			Some(&StorageKey(array_bytes::hex2bytes_unchecked("3a636f6465"))),
 		)
 		.unwrap()
 		.take(7)
-		.map(|x| hex::encode(&x.0))
+		.map(|x| array_bytes::bytes2hex("", &x.0))
 		.collect();
 	assert_eq!(
 		res,
@@ -1702,13 +1707,13 @@ fn storage_keys_iter_works() {
 		.storage_keys_iter(
 			&BlockId::Number(0),
 			Some(&prefix),
-			Some(&StorageKey(
-				hex!("79c07e2b1d2e2abfd4855b936617eeff5e0621c4869aa60c02be9adcc98a0d1d").to_vec(),
-			)),
+			Some(&StorageKey(array_bytes::hex2bytes_unchecked(
+				"79c07e2b1d2e2abfd4855b936617eeff5e0621c4869aa60c02be9adcc98a0d1d",
+			))),
 		)
 		.unwrap()
 		.take(5)
-		.map(|x| hex::encode(x.0))
+		.map(|x| array_bytes::bytes2hex("", &x.0))
 		.collect();
 	assert_eq!(
 		res,
@@ -34,9 +34,9 @@ sp-tracing = { version = "5.0.0", path = "../../primitives/tracing" }
 sp-transaction-pool = { version = "4.0.0-dev", path = "../../primitives/transaction-pool" }

 [dev-dependencies]
+array-bytes = "4.1"
 assert_matches = "1.3.0"
 criterion = "0.3"
-hex = "0.4"
 sc-block-builder = { version = "0.10.0-dev", path = "../block-builder" }
 sp-consensus = { version = "0.10.0-dev", path = "../../primitives/consensus/common" }
 substrate-test-runtime = { version = "2.0.0", path = "../../test-utils/runtime" }
@@ -880,7 +880,7 @@ fn should_not_accept_old_signatures() {

 	// generated with schnorrkel 0.1.1 from `_bytes`
 	let old_singature = sp_core::sr25519::Signature::try_from(
-		&hex::decode(
+		&array_bytes::hex2bytes(
 			"c427eb672e8c441c86d31f1a81b22b43102058e9ce237cabe9897ea5099ffd426\
 		cd1c6a1f4f2869c3df57901d36bedcb295657adb3a4355add86ed234eb83108",
 		)
@@ -13,7 +13,7 @@ readme = "README.md"
 targets = ["x86_64-unknown-linux-gnu"]

 [dependencies]
-hex = { version = "0.4", default-features = false, features = ["alloc"], optional = true }
+array-bytes = { version = "4.1", optional = true }
 sha2 = { version = "0.10.1", default-features = false, optional = true }
 log = { version = "0.4.14", default-features = false }

@@ -33,7 +33,7 @@ pallet-identity = { version = "4.0.0-dev", path = "../identity", default-feature
 pallet-collective = { version = "4.0.0-dev", path = "../collective", default-features = false, optional = true }

 [dev-dependencies]
-hex-literal = "0.3.1"
+array-bytes = "4.1"
 sha2 = "0.10.1"
 pallet-balances = { version = "4.0.0-dev", path = "../balances" }
 pallet-collective = { version = "4.0.0-dev", path = "../collective" }
@@ -55,7 +55,7 @@ std = [
 	"pallet-identity/std",
 ]
 runtime-benchmarks = [
-	"hex",
+	"array-bytes",
 	"sha2",
 	"frame-benchmarking/runtime-benchmarks",
 	"sp-runtime/runtime-benchmarks",
@@ -9,8 +9,8 @@ repository = "https://github.com/paritytech/substrate"
 homepage = "https://substrate.io"

 [dependencies]
+array-bytes = { version = "4.1", optional = true }
 codec = { package = "parity-scale-codec", version = "3.0.0", default-features = false, features = ["derive"] }
-hex = { version = "0.4", optional = true }
 log = { version = "0.4.17", default-features = false }
 scale-info = { version = "2.1.1", default-features = false, features = ["derive"] }
 serde = { version = "1.0.136", optional = true }
@@ -27,18 +27,18 @@ sp-runtime = { version = "6.0.0", default-features = false, path = "../../primit
 sp-std = { version = "4.0.0", default-features = false, path = "../../primitives/std" }

 [dev-dependencies]
-hex-literal = "0.3"
+array-bytes = "4.1"
 sp-staking = { version = "4.0.0-dev", path = "../../primitives/staking" }

 [features]
 default = ["std"]
 std = [
+	"array-bytes",
 	"beefy-merkle-tree/std",
 	"beefy-primitives/std",
 	"codec/std",
 	"frame-support/std",
 	"frame-system/std",
-	"hex",
 	"log/std",
 	"pallet-beefy/std",
 	"pallet-mmr/std",
@@ -9,7 +9,7 @@ description = "A no-std/Substrate compatible library to construct binary merkle
 homepage = "https://substrate.io"

 [dependencies]
-hex = { version = "0.4", default-features = false, optional = true }
+array-bytes = { version = "4.1", optional = true }
 log = { version = "0.4", default-features = false, optional = true }
 tiny-keccak = { version = "2.0.2", features = ["keccak"], optional = true }

@@ -17,12 +17,11 @@ beefy-primitives = { version = "4.0.0-dev", default-features = false, path = "..
 sp-api = { version = "4.0.0-dev", default-features = false, path = "../../../primitives/api" }

 [dev-dependencies]
+array-bytes = "4.1"
 env_logger = "0.9"
-hex = "0.4"
-hex-literal = "0.3"

 [features]
-debug = ["hex", "hex/std", "log"]
+debug = ["array-bytes", "log"]
 default = ["debug", "keccak", "std"]
 keccak = ["tiny-keccak"]
 std = [
@@ -235,7 +235,11 @@ where
 	#[cfg(feature = "debug")]
 	log::debug!(
 		"[merkle_proof] Proof: {:?}",
-		collect_proof.proof.iter().map(hex::encode).collect::<Vec<_>>()
+		collect_proof
+			.proof
+			.iter()
+			.map(|s| array_bytes::bytes2hex("", s))
+			.collect::<Vec<_>>()
 	);

 	MerkleProof { root, proof: collect_proof.proof, number_of_leaves, leaf_index, leaf }
@@ -308,10 +312,10 @@ where
 		#[cfg(feature = "debug")]
 		log::debug!(
 			"[verify_proof]: (a, b) {:?}, {:?} => {:?} ({:?}) hash",
-			hex::encode(a),
-			hex::encode(b),
-			hex::encode(hash),
-			hex::encode(combined)
+			array_bytes::bytes2hex("", &a),
+			array_bytes::bytes2hex("", &b),
+			array_bytes::bytes2hex("", &hash),
+			array_bytes::bytes2hex("", &combined)
 		);
 		position /= 2;
 		width = ((width - 1) / 2) + 1;
@@ -348,7 +352,11 @@ where
 		visitor.visit(index, &a, &b);

 		#[cfg(feature = "debug")]
-		log::debug!("  {:?}\n  {:?}", a.as_ref().map(hex::encode), b.as_ref().map(hex::encode));
+		log::debug!(
+			"  {:?}\n  {:?}",
+			a.as_ref().map(|s| array_bytes::bytes2hex("", s)),
+			b.as_ref().map(|s| array_bytes::bytes2hex("", s))
+		);

 		index += 2;
 		match (a, b) {
@@ -369,7 +377,7 @@ where
 				#[cfg(feature = "debug")]
 				log::debug!(
 					"[merkelize_row] Next: {:?}",
-					next.iter().map(hex::encode).collect::<Vec<_>>()
+					next.iter().map(|s| array_bytes::bytes2hex("", s)).collect::<Vec<_>>()
 				);
 				return Err(next)
 			},
@@ -395,7 +403,6 @@ sp_api::decl_runtime_apis! {
 #[cfg(test)]
 mod tests {
 	use super::*;
-	use hex_literal::hex;

 	#[test]
 	fn should_generate_empty_root() {
@@ -408,7 +415,7 @@ mod tests {

 		// then
 		assert_eq!(
-			hex::encode(&out),
+			array_bytes::bytes2hex("", &out),
 			"0000000000000000000000000000000000000000000000000000000000000000"
 		);
 	}
@@ -417,14 +424,16 @@ mod tests {
 	fn should_generate_single_root() {
 		// given
 		let _ = env_logger::try_init();
-		let data = vec![hex!("E04CC55ebEE1cBCE552f250e85c57B70B2E2625b")];
+		let data = vec![array_bytes::hex2array_unchecked::<20>(
+			"E04CC55ebEE1cBCE552f250e85c57B70B2E2625b",
+		)];

 		// when
 		let out = merkle_root::<Keccak256, _, _>(data);

 		// then
 		assert_eq!(
-			hex::encode(&out),
+			array_bytes::bytes2hex("", &out),
 			"aeb47a269393297f4b0a3c9c9cfd00c7a4195255274cf39d83dabc2fcc9ff3d7"
 		);
 	}
@@ -434,8 +443,8 @@ mod tests {
 		// given
 		let _ = env_logger::try_init();
 		let data = vec![
-			hex!("E04CC55ebEE1cBCE552f250e85c57B70B2E2625b"),
-			hex!("25451A4de12dcCc2D166922fA938E900fCc4ED24"),
+			array_bytes::hex2array_unchecked::<20>("E04CC55ebEE1cBCE552f250e85c57B70B2E2625b"),
+			array_bytes::hex2array_unchecked::<20>("25451A4de12dcCc2D166922fA938E900fCc4ED24"),
 		];

 		// when
@@ -443,7 +452,7 @@ mod tests {

 		// then
 		assert_eq!(
-			hex::encode(&out),
+			array_bytes::bytes2hex("", &out),
 			"697ea2a8fe5b03468548a7a413424a6292ab44a82a6f5cc594c3fa7dda7ce402"
 		);
 	}
@@ -452,7 +461,7 @@ mod tests {
 	fn should_generate_root_complex() {
 		let _ = env_logger::try_init();
 		let test = |root, data| {
-			assert_eq!(hex::encode(&merkle_root::<Keccak256, _, _>(data)), root);
+			assert_eq!(array_bytes::bytes2hex("", &merkle_root::<Keccak256, _, _>(data)), root);
 		};

 		test(
@@ -511,11 +520,19 @@ mod tests {
 		));

 		// then
-		assert_eq!(hex::encode(proof0.root), hex::encode(proof1.root));
-		assert_eq!(hex::encode(proof2.root), hex::encode(proof1.root));
+		assert_eq!(
+			array_bytes::bytes2hex("", &proof0.root),
+			array_bytes::bytes2hex("", &proof1.root)
+		);
+		assert_eq!(
+			array_bytes::bytes2hex("", &proof2.root),
+			array_bytes::bytes2hex("", &proof1.root)
+		);

 		assert!(!verify_proof::<Keccak256, _, _>(
-			&hex!("fb3b3be94be9e983ba5e094c9c51a7d96a4fa2e5d8e891df00ca89ba05bb1239"),
+			&array_bytes::hex2array_unchecked(
+				"fb3b3be94be9e983ba5e094c9c51a7d96a4fa2e5d8e891df00ca89ba05bb1239"
+			),
 			proof0.proof,
 			data.len(),
 			proof0.leaf_index,
@@ -779,17 +796,19 @@ mod tests {
 			"0xA4cDc98593CE52d01Fe5Ca47CB3dA5320e0D7592",
 			"0xc26B34D375533fFc4c5276282Fa5D660F3d8cbcB",
 		];
-		let root = hex!("72b0acd7c302a84f1f6b6cefe0ba7194b7398afb440e1b44a9dbbe270394ca53");
+		let root = array_bytes::hex2array_unchecked(
+			"72b0acd7c302a84f1f6b6cefe0ba7194b7398afb440e1b44a9dbbe270394ca53",
+		);

 		let data = addresses
 			.into_iter()
-			.map(|address| hex::decode(&address[2..]).unwrap())
+			.map(|address| array_bytes::hex2bytes_unchecked(&address))
 			.collect::<Vec<_>>();

 		for l in 0..data.len() {
 			// when
 			let proof = merkle_proof::<Keccak256, _, _>(data.clone(), l);
-			assert_eq!(hex::encode(&proof.root), hex::encode(&root));
+			assert_eq!(array_bytes::bytes2hex("", &proof.root), array_bytes::bytes2hex("", &root));
 			assert_eq!(proof.leaf_index, l);
 			assert_eq!(&proof.leaf, &data[l]);

@@ -810,14 +829,25 @@ mod tests {
 			MerkleProof {
 				root,
 				proof: vec![
-					hex!("340bcb1d49b2d82802ddbcf5b85043edb3427b65d09d7f758fbc76932ad2da2f"),
-					hex!("ba0580e5bd530bc93d61276df7969fb5b4ae8f1864b4a28c280249575198ff1f"),
-					hex!("d02609d2bbdb28aa25f58b85afec937d5a4c85d37925bce6d0cf802f9d76ba79"),
-					hex!("ae3f8991955ed884613b0a5f40295902eea0e0abe5858fc520b72959bc016d4e"),
+					array_bytes::hex2array_unchecked(
+						"340bcb1d49b2d82802ddbcf5b85043edb3427b65d09d7f758fbc76932ad2da2f"
+					),
+					array_bytes::hex2array_unchecked(
+						"ba0580e5bd530bc93d61276df7969fb5b4ae8f1864b4a28c280249575198ff1f"
+					),
+					array_bytes::hex2array_unchecked(
+						"d02609d2bbdb28aa25f58b85afec937d5a4c85d37925bce6d0cf802f9d76ba79"
+					),
+					array_bytes::hex2array_unchecked(
+						"ae3f8991955ed884613b0a5f40295902eea0e0abe5858fc520b72959bc016d4e"
+					),
 				],
 				number_of_leaves: data.len(),
 				leaf_index: data.len() - 1,
-				leaf: hex!("c26B34D375533fFc4c5276282Fa5D660F3d8cbcB").to_vec(),
+				leaf: array_bytes::hex2array_unchecked::<20>(
+					"c26B34D375533fFc4c5276282Fa5D660F3d8cbcB"
+				)
+				.to_vec(),
 			}
 		);
 	}
@@ -22,7 +22,6 @@ use beefy_primitives::{
 	ValidatorSet,
 };
 use codec::{Decode, Encode};
-use hex_literal::hex;

 use sp_core::H256;
 use sp_io::TestExternalities;
@@ -70,9 +69,9 @@ fn should_contain_mmr_digest() {
 				beefy_log(ConsensusLog::AuthoritiesChange(
 					ValidatorSet::new(vec![mock_beefy_id(1), mock_beefy_id(2)], 1).unwrap()
 				)),
-				beefy_log(ConsensusLog::MmrRoot(
-					hex!("95803defe6ea9f41e7ec6afa497064f21bfded027d8812efacbdf984e630cbdc").into()
-				))
+				beefy_log(ConsensusLog::MmrRoot(array_bytes::hex_n_into_unchecked(
+					"95803defe6ea9f41e7ec6afa497064f21bfded027d8812efacbdf984e630cbdc"
+				)))
 			]
 		);

@@ -85,15 +84,15 @@ fn should_contain_mmr_digest() {
 				beefy_log(ConsensusLog::AuthoritiesChange(
 					ValidatorSet::new(vec![mock_beefy_id(1), mock_beefy_id(2)], 1).unwrap()
 				)),
-				beefy_log(ConsensusLog::MmrRoot(
-					hex!("95803defe6ea9f41e7ec6afa497064f21bfded027d8812efacbdf984e630cbdc").into()
-				)),
+				beefy_log(ConsensusLog::MmrRoot(array_bytes::hex_n_into_unchecked(
+					"95803defe6ea9f41e7ec6afa497064f21bfded027d8812efacbdf984e630cbdc"
+				))),
 				beefy_log(ConsensusLog::AuthoritiesChange(
 					ValidatorSet::new(vec![mock_beefy_id(3), mock_beefy_id(4)], 2).unwrap()
 				)),
-				beefy_log(ConsensusLog::MmrRoot(
-					hex!("a73271a0974f1e67d6e9b8dd58e506177a2e556519a330796721e98279a753e2").into()
-				)),
+				beefy_log(ConsensusLog::MmrRoot(array_bytes::hex_n_into_unchecked(
+					"a73271a0974f1e67d6e9b8dd58e506177a2e556519a330796721e98279a753e2"
+				))),
 			]
 		);
 	});
@@ -120,11 +119,13 @@ fn should_contain_valid_leaf_data() {
 			beefy_next_authority_set: BeefyNextAuthoritySet {
 				id: 2,
 				len: 2,
-				root: hex!("9c6b2c1b0d0b25a008e6c882cc7b415f309965c72ad2b944ac0931048ca31cd5")
-					.into(),
+				root: array_bytes::hex_n_into_unchecked(
+					"9c6b2c1b0d0b25a008e6c882cc7b415f309965c72ad2b944ac0931048ca31cd5"
+				)
 			},
-			leaf_extra: hex!("55b8e9e1cc9f0db7776fac0ca66318ef8acfb8ec26db11e373120583e07ee648")
-				.to_vec(),
+			leaf_extra: array_bytes::hex2bytes_unchecked(
+				"55b8e9e1cc9f0db7776fac0ca66318ef8acfb8ec26db11e373120583e07ee648"
+			)
 		}
 	);

@@ -143,11 +144,13 @@ fn should_contain_valid_leaf_data() {
 			beefy_next_authority_set: BeefyNextAuthoritySet {
 				id: 3,
 				len: 2,
-				root: hex!("9c6b2c1b0d0b25a008e6c882cc7b415f309965c72ad2b944ac0931048ca31cd5")
-					.into(),
+				root: array_bytes::hex_n_into_unchecked(
+					"9c6b2c1b0d0b25a008e6c882cc7b415f309965c72ad2b944ac0931048ca31cd5"
+				)
 			},
-			leaf_extra: hex!("55b8e9e1cc9f0db7776fac0ca66318ef8acfb8ec26db11e373120583e07ee648")
-				.to_vec()
+			leaf_extra: array_bytes::hex2bytes_unchecked(
+				"55b8e9e1cc9f0db7776fac0ca66318ef8acfb8ec26db11e373120583e07ee648"
+			)
 		}
 	);
 }
@@ -161,8 +164,9 @@ fn should_update_authorities() {
 		// check current authority set
 		assert_eq!(0, auth_set.id);
 		assert_eq!(2, auth_set.len);
-		let want: H256 =
-			hex!("176e73f1bf656478b728e28dd1a7733c98621b8acf830bff585949763dca7a96").into();
+		let want = array_bytes::hex_n_into_unchecked::<H256, 32>(
+			"176e73f1bf656478b728e28dd1a7733c98621b8acf830bff585949763dca7a96",
+		);
 		assert_eq!(want, auth_set.root);

 		// next authority set should have same validators but different id
@@ -180,8 +184,9 @@ fn should_update_authorities() {
 		assert_eq!(1, auth_set.id);
 		// check next auth set
 		assert_eq!(2, next_auth_set.id);
-		let want: H256 =
-			hex!("9c6b2c1b0d0b25a008e6c882cc7b415f309965c72ad2b944ac0931048ca31cd5").into();
+		let want = array_bytes::hex_n_into_unchecked::<H256, 32>(
+			"9c6b2c1b0d0b25a008e6c882cc7b415f309965c72ad2b944ac0931048ca31cd5",
+		);
 		assert_eq!(2, next_auth_set.len);
 		assert_eq!(want, next_auth_set.root);

@@ -195,8 +200,9 @@ fn should_update_authorities() {
 		assert_eq!(2, auth_set.id);
 		// check next auth set
 		assert_eq!(3, next_auth_set.id);
-		let want: H256 =
-			hex!("9c6b2c1b0d0b25a008e6c882cc7b415f309965c72ad2b944ac0931048ca31cd5").into();
+		let want = array_bytes::hex_n_into_unchecked::<H256, 32>(
+			"9c6b2c1b0d0b25a008e6c882cc7b415f309965c72ad2b944ac0931048ca31cd5",
+		);
 		assert_eq!(2, next_auth_set.len);
 		assert_eq!(want, next_auth_set.root);
 	});
@@ -31,7 +31,7 @@ sp-std = { version = "4.0.0", default-features = false, path = "../../primitives
 sp-storage = { version = "6.0.0", default-features = false, path = "../../primitives/storage" }

 [dev-dependencies]
-hex-literal = "0.3.4"
+array-bytes = "4.1"
 rusty-fork = { version = "0.3.0", default-features = false }
 sp-keystore = { version = "0.12.0", path = "../../primitives/keystore" }

@@ -1695,13 +1695,13 @@ pub fn show_benchmark_debug_info(
 /// use frame_benchmarking::TrackedStorageKey;
 /// let whitelist: Vec<TrackedStorageKey> = vec![
 /// 	// Block Number
-/// 	hex_literal::hex!("26aa394eea5630e07c48ae0c9558cef702a5c1b19ab7a04f536c519aca4983ac").to_vec().into(),
+/// 	array_bytes::hex_into_unchecked("26aa394eea5630e07c48ae0c9558cef702a5c1b19ab7a04f536c519aca4983ac"),
 /// 	// Total Issuance
-/// 	hex_literal::hex!("c2261276cc9d1f8598ea4b6a74b15c2f57c875e4cff74148e4628f264b974c80").to_vec().into(),
+/// 	array_bytes::hex_into_unchecked("c2261276cc9d1f8598ea4b6a74b15c2f57c875e4cff74148e4628f264b974c80"),
 /// 	// Execution Phase
-/// 	hex_literal::hex!("26aa394eea5630e07c48ae0c9558cef7ff553b5a9862a516939d82b3d3d8661a").to_vec().into(),
+/// 	array_bytes::hex_into_unchecked("26aa394eea5630e07c48ae0c9558cef7ff553b5a9862a516939d82b3d3d8661a"),
 /// 	// Event Count
-/// 	hex_literal::hex!("26aa394eea5630e07c48ae0c9558cef70a98fdbe9ce6c55837576c60c7af3850").to_vec().into(),
+/// 	array_bytes::hex_into_unchecked("26aa394eea5630e07c48ae0c9558cef70a98fdbe9ce6c55837576c60c7af3850"),
 /// ];
 /// ```
 ///
@@ -45,9 +45,9 @@ sp-sandbox = { version = "0.10.0-dev", default-features = false, path = "../../p
 sp-std = { version = "4.0.0", default-features = false, path = "../../primitives/std" }

 [dev-dependencies]
+array-bytes = "4.1"
 assert_matches = "1"
 env_logger = "0.9"
-hex-literal = "0.3"
 pretty_assertions = "1"
 wat = "1"

@@ -1379,7 +1379,6 @@ mod tests {
 	use codec::{Decode, Encode};
 	use frame_support::{assert_err, assert_ok, parameter_types};
 	use frame_system::{EventRecord, Phase};
-	use hex_literal::hex;
 	use pallet_contracts_primitives::ReturnFlags;
 	use pretty_assertions::assert_eq;
 	use sp_core::Bytes;
@@ -3210,13 +3209,12 @@ mod tests {
 	#[test]
 	fn ecdsa_to_eth_address_returns_proper_value() {
 		let bob_ch = MockLoader::insert(Call, |ctx, _| {
-			let pubkey_compressed: [u8; 33] =
-				hex!("028db55b05db86c0b1786ca49f095d76344c9e6056b2f02701a7e7f3c20aabfd91")[..]
-					.try_into()
-					.unwrap();
+			let pubkey_compressed = array_bytes::hex2array_unchecked(
+				"028db55b05db86c0b1786ca49f095d76344c9e6056b2f02701a7e7f3c20aabfd91",
+			);
 			assert_eq!(
 				ctx.ext.ecdsa_to_eth_address(&pubkey_compressed).unwrap(),
-				hex!("09231da7b19A016f9e576d23B16277062F4d46A8")[..]
+				array_bytes::hex2array_unchecked::<20>("09231da7b19A016f9e576d23B16277062F4d46A8")
 			);
 			exec_success()
 		});
@@ -275,7 +275,6 @@ mod tests {
 	};
 	use assert_matches::assert_matches;
 	use frame_support::{assert_ok, dispatch::DispatchResultWithPostInfo, weights::Weight};
-	use hex_literal::hex;
 	use pallet_contracts_primitives::{ExecReturnValue, ReturnFlags};
 	use pretty_assertions::assert_eq;
 	use sp_core::{Bytes, H256};
@@ -1828,10 +1827,9 @@ mod tests {
 			output,
 			ExecReturnValue {
 				flags: ReturnFlags::empty(),
-				data: Bytes(
-					hex!("000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F")
-						.to_vec()
-				),
+				data: array_bytes::hex_into_unchecked(
+					"000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F"
+				)
 			},
 		);
 	}
@@ -1901,7 +1899,9 @@ mod tests {
 				flags: ReturnFlags::empty(),
 				data: Bytes(
 					(
-						hex!("000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F"),
+						array_bytes::hex2array_unchecked::<32>(
+							"000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F"
+						),
 						42u64,
 					)
 						.encode()
@@ -2110,7 +2110,7 @@ mod tests {
 	fn seal_return_with_success_status() {
 		let output = execute(
 			CODE_RETURN_WITH_DATA,
-			hex!("00000000445566778899").to_vec(),
+			array_bytes::hex2bytes_unchecked("00000000445566778899"),
 			MockExt::default(),
 		)
 		.unwrap();
@@ -2119,7 +2119,7 @@ mod tests {
 			output,
 			ExecReturnValue {
 				flags: ReturnFlags::empty(),
-				data: Bytes(hex!("445566778899").to_vec()),
+				data: Bytes(array_bytes::hex2bytes_unchecked("445566778899")),
 			}
 		);
 		assert!(!output.did_revert());
@@ -2127,15 +2127,18 @@ mod tests {

 	#[test]
 	fn return_with_revert_status() {
-		let output =
-			execute(CODE_RETURN_WITH_DATA, hex!("010000005566778899").to_vec(), MockExt::default())
-				.unwrap();
+		let output = execute(
+			CODE_RETURN_WITH_DATA,
+			array_bytes::hex2bytes_unchecked("010000005566778899"),
+			MockExt::default(),
+		)
+		.unwrap();

 		assert_eq!(
 			output,
 			ExecReturnValue {
 				flags: ReturnFlags::REVERT,
-				data: Bytes(hex!("5566778899").to_vec()),
+				data: Bytes(array_bytes::hex2bytes_unchecked("5566778899")),
 			}
 		);
 		assert!(output.did_revert());
@@ -27,7 +27,7 @@ sp-std = { version = "4.0.0", default-features = false, path = "../../primitives
 sp-tracing = { version = "5.0.0", default-features = false, path = "../../primitives/tracing" }

 [dev-dependencies]
-hex-literal = "0.3.4"
+array-bytes = "4.1"
 pallet-balances = { version = "4.0.0-dev", path = "../balances" }
 pallet-transaction-payment = { version = "4.0.0-dev", path = "../transaction-payment" }
 sp-core = { version = "6.0.0", path = "../../primitives/core" }
@@ -602,8 +602,6 @@ where
 mod tests {
 	use super::*;

-	use hex_literal::hex;
-
 	use sp_core::H256;
 	use sp_runtime::{
 		generic::{DigestItem, Era},
@@ -947,11 +945,15 @@ mod tests {
 	fn block_import_works() {
 		block_import_works_inner(
 			new_test_ext_v0(1),
-			hex!("1039e1a4bd0cf5deefe65f313577e70169c41c7773d6acf31ca8d671397559f5").into(),
+			array_bytes::hex_n_into_unchecked(
+				"1039e1a4bd0cf5deefe65f313577e70169c41c7773d6acf31ca8d671397559f5",
+			),
 		);
 		block_import_works_inner(
 			new_test_ext(1),
-			hex!("75e7d8f360d375bbe91bcf8019c01ab6362448b4a89e3b329717eb9d910340e5").into(),
+			array_bytes::hex_n_into_unchecked(
+				"75e7d8f360d375bbe91bcf8019c01ab6362448b4a89e3b329717eb9d910340e5",
+			),
 		);
 	}
 	fn block_import_works_inner(mut ext: sp_io::TestExternalities, state_root: H256) {
@@ -961,10 +963,9 @@ mod tests {
 					parent_hash: [69u8; 32].into(),
 					number: 1,
 					state_root,
-					extrinsics_root: hex!(
-						"03170a2e7597b7b7e3d84c05391d139a62b157e78786d8c082f29dcf4c111314"
-					)
-					.into(),
+					extrinsics_root: array_bytes::hex_n_into_unchecked(
+						"03170a2e7597b7b7e3d84c05391d139a62b157e78786d8c082f29dcf4c111314",
+					),
 					digest: Digest { logs: vec![] },
 				},
 				extrinsics: vec![],
@@ -981,10 +982,9 @@ mod tests {
 					parent_hash: [69u8; 32].into(),
 					number: 1,
 					state_root: [0u8; 32].into(),
-					extrinsics_root: hex!(
-						"03170a2e7597b7b7e3d84c05391d139a62b157e78786d8c082f29dcf4c111314"
-					)
-					.into(),
+					extrinsics_root: array_bytes::hex_n_into_unchecked(
+						"03170a2e7597b7b7e3d84c05391d139a62b157e78786d8c082f29dcf4c111314",
+					),
 					digest: Digest { logs: vec![] },
 				},
 				extrinsics: vec![],
@@ -1000,10 +1000,9 @@ mod tests {
 				header: Header {
 					parent_hash: [69u8; 32].into(),
 					number: 1,
-					state_root: hex!(
-						"75e7d8f360d375bbe91bcf8019c01ab6362448b4a89e3b329717eb9d910340e5"
-					)
-					.into(),
+					state_root: array_bytes::hex_n_into_unchecked(
+						"75e7d8f360d375bbe91bcf8019c01ab6362448b4a89e3b329717eb9d910340e5",
+					),
 					extrinsics_root: [0u8; 32].into(),
 					digest: Digest { logs: vec![] },
 				},
@@ -25,8 +25,8 @@ sp-runtime = { version = "6.0.0", default-features = false, path = "../../primit
 sp-std = { version = "4.0.0", default-features = false, path = "../../primitives/std" }

 [dev-dependencies]
+array-bytes = "4.1"
 env_logger = "0.9"
-hex-literal = "0.3"
 itertools = "0.10.3"

 [features]
@@ -13,8 +13,8 @@ readme = "README.md"
 targets = ["x86_64-unknown-linux-gnu"]

 [dependencies]
+array-bytes = { version = "4.1", optional = true }
 codec = { package = "parity-scale-codec", version = "3.0.0", default-features = false }
-hex-literal = { version = "0.3.4", optional = true }
 scale-info = { version = "2.1.1", default-features = false, features = ["derive"] }
 serde = { version = "1.0.136", optional = true }
 frame-benchmarking = { version = "4.0.0-dev", default-features = false, optional = true, path = "../benchmarking" }
@@ -34,7 +34,7 @@ sp-transaction-storage-proof = { version = "4.0.0-dev", default-features = true,

 [features]
 default = ["std"]
-runtime-benchmarks = ["frame-benchmarking/runtime-benchmarks", "hex-literal"]
+runtime-benchmarks = ["array-bytes", "frame-benchmarking/runtime-benchmarks"]
 std = [
 	"log/std",
 	"frame-benchmarking?/std",
@@ -40,67 +40,68 @@ use crate::Pallet as TransactionStorage;
 // build_proof(hash.as_slice(), transactions).unwrap().encode()
 // ```
 // while hardforcing target chunk key in `build_proof` to [22, 21, 1, 0].
-const PROOF: &[u8] = &hex_literal::hex!(
-	"
-		0104000000000000000000000000000000000000000000000000000000000000000000000000
-		0000000000000000000000000000000000000000000000000000000000000000000000000000
-		0000000000000000000000000000000000000000000000000000000000000000000000000000
-		0000000000000000000000000000000000000000000000000000000000000000000000000000
-		0000000000000000000000000000000000000000000000000000000000000000000000000000
-		0000000000000000000000000000000000000000000000000000000000000000000000000000
-		00000000000000000000000000000000000000000000000000000000000014cd0780ffff8030
-		2eb0a6d2f63b834d15f1e729d1c1004657e3048cf206d697eeb153f61a30ba0080302eb0a6d2
-		f63b834d15f1e729d1c1004657e3048cf206d697eeb153f61a30ba80302eb0a6d2f63b834d15
-		f1e729d1c1004657e3048cf206d697eeb153f61a30ba80302eb0a6d2f63b834d15f1e729d1c1
-		004657e3048cf206d697eeb153f61a30ba80302eb0a6d2f63b834d15f1e729d1c1004657e304
-		8cf206d697eeb153f61a30ba80302eb0a6d2f63b834d15f1e729d1c1004657e3048cf206d697
-		eeb153f61a30ba80302eb0a6d2f63b834d15f1e729d1c1004657e3048cf206d697eeb153f61a
-		30ba80302eb0a6d2f63b834d15f1e729d1c1004657e3048cf206d697eeb153f61a30ba80302e
-		b0a6d2f63b834d15f1e729d1c1004657e3048cf206d697eeb153f61a30ba80302eb0a6d2f63b
-		834d15f1e729d1c1004657e3048cf206d697eeb153f61a30ba80302eb0a6d2f63b834d15f1e7
-		29d1c1004657e3048cf206d697eeb153f61a30ba80302eb0a6d2f63b834d15f1e729d1c10046
-		57e3048cf206d697eeb153f61a30ba80302eb0a6d2f63b834d15f1e729d1c1004657e3048cf2
-		06d697eeb153f61a30ba80302eb0a6d2f63b834d15f1e729d1c1004657e3048cf206d697eeb1
-		53f61a30ba80302eb0a6d2f63b834d15f1e729d1c1004657e3048cf206d697eeb153f61a30ba
-		bd058077778010fd81bc1359802f0b871aeb95e4410a8ec92b93af10ea767a2027cf4734e8de
-		808da338e6b722f7bf2051901bd5bccee5e71d5cf6b1faff338ad7120b0256c28380221ce17f
-		19117affa96e077905fe48a99723a065969c638593b7d9ab57b538438010fd81bc1359802f0b
-		871aeb95e4410a8ec92b93af10ea767a2027cf4734e8de808da338e6b722f7bf2051901bd5bc
-		cee5e71d5cf6b1faff338ad7120b0256c283008010fd81bc1359802f0b871aeb95e4410a8ec9
-		2b93af10ea767a2027cf4734e8de808da338e6b722f7bf2051901bd5bccee5e71d5cf6b1faff
-		338ad7120b0256c28380221ce17f19117affa96e077905fe48a99723a065969c638593b7d9ab
-		57b538438010fd81bc1359802f0b871aeb95e4410a8ec92b93af10ea767a2027cf4734e8de80
-		8da338e6b722f7bf2051901bd5bccee5e71d5cf6b1faff338ad7120b0256c28380221ce17f19
-		117affa96e077905fe48a99723a065969c638593b7d9ab57b53843cd0780ffff804509f59593
-		fd47b1a97189127ba65a5649cfb0346637f9836e155eaf891a939c00804509f59593fd47b1a9
-		7189127ba65a5649cfb0346637f9836e155eaf891a939c804509f59593fd47b1a97189127ba6
-		5a5649cfb0346637f9836e155eaf891a939c804509f59593fd47b1a97189127ba65a5649cfb0
-		346637f9836e155eaf891a939c804509f59593fd47b1a97189127ba65a5649cfb0346637f983
-		6e155eaf891a939c804509f59593fd47b1a97189127ba65a5649cfb0346637f9836e155eaf89
-		1a939c804509f59593fd47b1a97189127ba65a5649cfb0346637f9836e155eaf891a939c8045
-		09f59593fd47b1a97189127ba65a5649cfb0346637f9836e155eaf891a939c804509f59593fd
-		47b1a97189127ba65a5649cfb0346637f9836e155eaf891a939c804509f59593fd47b1a97189
-		127ba65a5649cfb0346637f9836e155eaf891a939c804509f59593fd47b1a97189127ba65a56
-		49cfb0346637f9836e155eaf891a939c804509f59593fd47b1a97189127ba65a5649cfb03466
-		37f9836e155eaf891a939c804509f59593fd47b1a97189127ba65a5649cfb0346637f9836e15
-		5eaf891a939c804509f59593fd47b1a97189127ba65a5649cfb0346637f9836e155eaf891a93
-		9c804509f59593fd47b1a97189127ba65a5649cfb0346637f9836e155eaf891a939ccd0780ff
-		ff8078916e776c64ccea05e958559f015c082d9d06feafa3610fc44a5b2ef543cb818078916e
-		776c64ccea05e958559f015c082d9d06feafa3610fc44a5b2ef543cb818078916e776c64ccea
-		05e958559f015c082d9d06feafa3610fc44a5b2ef543cb818078916e776c64ccea05e958559f
-		015c082d9d06feafa3610fc44a5b2ef543cb818078916e776c64ccea05e958559f015c082d9d
-		06feafa3610fc44a5b2ef543cb81008078916e776c64ccea05e958559f015c082d9d06feafa3
-		610fc44a5b2ef543cb818078916e776c64ccea05e958559f015c082d9d06feafa3610fc44a5b
-		2ef543cb818078916e776c64ccea05e958559f015c082d9d06feafa3610fc44a5b2ef543cb81
-		8078916e776c64ccea05e958559f015c082d9d06feafa3610fc44a5b2ef543cb818078916e77
-		6c64ccea05e958559f015c082d9d06feafa3610fc44a5b2ef543cb818078916e776c64ccea05
-		e958559f015c082d9d06feafa3610fc44a5b2ef543cb818078916e776c64ccea05e958559f01
-		5c082d9d06feafa3610fc44a5b2ef543cb818078916e776c64ccea05e958559f015c082d9d06
-		feafa3610fc44a5b2ef543cb818078916e776c64ccea05e958559f015c082d9d06feafa3610f
-		c44a5b2ef543cb818078916e776c64ccea05e958559f015c082d9d06feafa3610fc44a5b2ef5
-		43cb811044010000
-	"
-);
+const PROOF: &str = "\
+	0104000000000000000000000000000000000000000000000000000000000000000000000000\
+	0000000000000000000000000000000000000000000000000000000000000000000000000000\
+	0000000000000000000000000000000000000000000000000000000000000000000000000000\
+	0000000000000000000000000000000000000000000000000000000000000000000000000000\
+	0000000000000000000000000000000000000000000000000000000000000000000000000000\
+	0000000000000000000000000000000000000000000000000000000000000000000000000000\
+	00000000000000000000000000000000000000000000000000000000000014cd0780ffff8030\
+	2eb0a6d2f63b834d15f1e729d1c1004657e3048cf206d697eeb153f61a30ba0080302eb0a6d2\
+	f63b834d15f1e729d1c1004657e3048cf206d697eeb153f61a30ba80302eb0a6d2f63b834d15\
+	f1e729d1c1004657e3048cf206d697eeb153f61a30ba80302eb0a6d2f63b834d15f1e729d1c1\
+	004657e3048cf206d697eeb153f61a30ba80302eb0a6d2f63b834d15f1e729d1c1004657e304\
+	8cf206d697eeb153f61a30ba80302eb0a6d2f63b834d15f1e729d1c1004657e3048cf206d697\
+	eeb153f61a30ba80302eb0a6d2f63b834d15f1e729d1c1004657e3048cf206d697eeb153f61a\
+	30ba80302eb0a6d2f63b834d15f1e729d1c1004657e3048cf206d697eeb153f61a30ba80302e\
+	b0a6d2f63b834d15f1e729d1c1004657e3048cf206d697eeb153f61a30ba80302eb0a6d2f63b\
+	834d15f1e729d1c1004657e3048cf206d697eeb153f61a30ba80302eb0a6d2f63b834d15f1e7\
+	29d1c1004657e3048cf206d697eeb153f61a30ba80302eb0a6d2f63b834d15f1e729d1c10046\
+	57e3048cf206d697eeb153f61a30ba80302eb0a6d2f63b834d15f1e729d1c1004657e3048cf2\
+	06d697eeb153f61a30ba80302eb0a6d2f63b834d15f1e729d1c1004657e3048cf206d697eeb1\
+	53f61a30ba80302eb0a6d2f63b834d15f1e729d1c1004657e3048cf206d697eeb153f61a30ba\
+	bd058077778010fd81bc1359802f0b871aeb95e4410a8ec92b93af10ea767a2027cf4734e8de\
+	808da338e6b722f7bf2051901bd5bccee5e71d5cf6b1faff338ad7120b0256c28380221ce17f\
+	19117affa96e077905fe48a99723a065969c638593b7d9ab57b538438010fd81bc1359802f0b\
+	871aeb95e4410a8ec92b93af10ea767a2027cf4734e8de808da338e6b722f7bf2051901bd5bc\
+	cee5e71d5cf6b1faff338ad7120b0256c283008010fd81bc1359802f0b871aeb95e4410a8ec9\
+	2b93af10ea767a2027cf4734e8de808da338e6b722f7bf2051901bd5bccee5e71d5cf6b1faff\
+	338ad7120b0256c28380221ce17f19117affa96e077905fe48a99723a065969c638593b7d9ab\
+	57b538438010fd81bc1359802f0b871aeb95e4410a8ec92b93af10ea767a2027cf4734e8de80\
+	8da338e6b722f7bf2051901bd5bccee5e71d5cf6b1faff338ad7120b0256c28380221ce17f19\
+	117affa96e077905fe48a99723a065969c638593b7d9ab57b53843cd0780ffff804509f59593\
+	fd47b1a97189127ba65a5649cfb0346637f9836e155eaf891a939c00804509f59593fd47b1a9\
+	7189127ba65a5649cfb0346637f9836e155eaf891a939c804509f59593fd47b1a97189127ba6\
+	5a5649cfb0346637f9836e155eaf891a939c804509f59593fd47b1a97189127ba65a5649cfb0\
+	346637f9836e155eaf891a939c804509f59593fd47b1a97189127ba65a5649cfb0346637f983\
+	6e155eaf891a939c804509f59593fd47b1a97189127ba65a5649cfb0346637f9836e155eaf89\
+	1a939c804509f59593fd47b1a97189127ba65a5649cfb0346637f9836e155eaf891a939c8045\
+	09f59593fd47b1a97189127ba65a5649cfb0346637f9836e155eaf891a939c804509f59593fd\
+	47b1a97189127ba65a5649cfb0346637f9836e155eaf891a939c804509f59593fd47b1a97189\
+	127ba65a5649cfb0346637f9836e155eaf891a939c804509f59593fd47b1a97189127ba65a56\
+	49cfb0346637f9836e155eaf891a939c804509f59593fd47b1a97189127ba65a5649cfb03466\
+	37f9836e155eaf891a939c804509f59593fd47b1a97189127ba65a5649cfb0346637f9836e15\
+	5eaf891a939c804509f59593fd47b1a97189127ba65a5649cfb0346637f9836e155eaf891a93\
+	9c804509f59593fd47b1a97189127ba65a5649cfb0346637f9836e155eaf891a939ccd0780ff\
+	ff8078916e776c64ccea05e958559f015c082d9d06feafa3610fc44a5b2ef543cb818078916e\
+	776c64ccea05e958559f015c082d9d06feafa3610fc44a5b2ef543cb818078916e776c64ccea\
+	05e958559f015c082d9d06feafa3610fc44a5b2ef543cb818078916e776c64ccea05e958559f\
+	015c082d9d06feafa3610fc44a5b2ef543cb818078916e776c64ccea05e958559f015c082d9d\
+	06feafa3610fc44a5b2ef543cb81008078916e776c64ccea05e958559f015c082d9d06feafa3\
+	610fc44a5b2ef543cb818078916e776c64ccea05e958559f015c082d9d06feafa3610fc44a5b\
+	2ef543cb818078916e776c64ccea05e958559f015c082d9d06feafa3610fc44a5b2ef543cb81\
+	8078916e776c64ccea05e958559f015c082d9d06feafa3610fc44a5b2ef543cb818078916e77\
+	6c64ccea05e958559f015c082d9d06feafa3610fc44a5b2ef543cb818078916e776c64ccea05\
+	e958559f015c082d9d06feafa3610fc44a5b2ef543cb818078916e776c64ccea05e958559f01\
+	5c082d9d06feafa3610fc44a5b2ef543cb818078916e776c64ccea05e958559f015c082d9d06\
+	feafa3610fc44a5b2ef543cb818078916e776c64ccea05e958559f015c082d9d06feafa3610f\
+	c44a5b2ef543cb818078916e776c64ccea05e958559f015c082d9d06feafa3610fc44a5b2ef5\
+	43cb811044010000\
+";
+fn proof() -> Vec<u8> {
+	array_bytes::hex2bytes_unchecked(PROOF)
+}

 type BalanceOf<T> =
 	<<T as Config>::Currency as Currency<<T as frame_system::Config>::AccountId>>::Balance;
@@ -159,8 +160,8 @@ benchmarks! {
 			)?;
 		}
 		run_to_block::<T>(StoragePeriod::<T>::get() + T::BlockNumber::one());
-		let mut encoded_proof = PROOF;
-		let proof = TransactionStorageProof::decode(&mut encoded_proof).unwrap();
+		let encoded_proof = proof();
+		let proof = TransactionStorageProof::decode(&mut &*encoded_proof).unwrap();
 	}: check_proof(RawOrigin::None, proof)
 	verify {
 		assert_last_event::<T>(Event::ProofChecked.into());
@@ -22,8 +22,7 @@ sp-runtime = { version = "6.0.0", default-features = false, path = "../runtime"
 sp-std = { version = "4.0.0", default-features = false, path = "../std" }

 [dev-dependencies]
-hex = "0.4.3"
-hex-literal = "0.3"
+array-bytes = "4.1"
 sp-keystore = { version = "0.12.0", path = "../keystore" }

 [features]
@@ -148,12 +148,14 @@ mod tests {
 		assert_eq!(decoded, Ok(witness));
 		assert_eq!(
 			encoded,
-			hex_literal::hex!(
-				"046d683048656c6c6f20576f726c642105000000000000000000000000000000000000000000000010
-				0000010110000001558455ad81279df0795cc985580e4fb75d72d948d1107b2ac80a09abed4da8480c
-				746cc321f2319a5e99a830e314d10dd3cd68ce3dc0c33c86e99bcb7816f9ba01012d6e1f8105c337a86
-				cdd9aaacdc496577f3db8c55ef9e6fd48f2c5c05a2274707491635d8ba3df64f324575b7b2a34487bc
-				a2324b6a0046395a71681be3d0c2a00"
+			array_bytes::hex2bytes_unchecked(
+				"\
+				046d683048656c6c6f20576f726c642105000000000000000000000000000000000000000000000010\
+				0000010110000001558455ad81279df0795cc985580e4fb75d72d948d1107b2ac80a09abed4da8480c\
+				746cc321f2319a5e99a830e314d10dd3cd68ce3dc0c33c86e99bcb7816f9ba01012d6e1f8105c337a8\
+				6cdd9aaacdc496577f3db8c55ef9e6fd48f2c5c05a2274707491635d8ba3df64f324575b7b2a34487b\
+				ca2324b6a0046395a71681be3d0c2a00\
+			"
 			)
 		);
 	}
@@ -47,13 +47,13 @@ thiserror = { version = "1.0.30", optional = true }
 bitflags = "1.3"

 # full crypto
+array-bytes = { version = "4.1", optional = true }
 ed25519-zebra = { version = "3.0.0", default-features = false, optional = true}
 blake2 = { version = "0.10.4", default-features = false, optional = true }
 schnorrkel = { version = "0.9.1", features = [
 	"preaudit_deprecated",
 	"u64_backend",
 ], default-features = false, optional = true }
-hex = { version = "0.4", default-features = false, optional = true }
 libsecp256k1 = { version = "0.7", default-features = false, features = ["static-context"], optional = true }
 merlin = { version = "2.0", default-features = false, optional = true }
 secp256k1 = { version = "0.24.0", default-features = false, features = ["recovery", "alloc"], optional = true }
@@ -63,7 +63,6 @@ sp-runtime-interface = { version = "6.0.0", default-features = false, path = "..

 [dev-dependencies]
 sp-serializer = { version = "4.0.0-dev", path = "../serializer" }
-hex-literal = "0.3.4"
 rand = "0.7.2"
 criterion = "0.3.3"
 serde_json = "1.0"
@@ -99,8 +98,8 @@ std = [
 	"sp-std/std",
 	"serde",
 	"blake2/std",
+	"array-bytes",
 	"ed25519-zebra",
-	"hex/std",
 	"base58",
 	"substrate-bip39",
 	"tiny-bip39",
@@ -129,10 +128,10 @@ std = [
 # or Intel SGX.
 # For the regular wasm runtime builds this should not be used.
 full_crypto = [
+	"array-bytes",
 	"ed25519-zebra",
 	"blake2",
 	"schnorrkel",
-	"hex",
 	"libsecp256k1",
 	"secp256k1",
 	"sp-core-hashing",
@@ -421,7 +421,7 @@ impl<T: Sized + AsMut<[u8]> + AsRef<[u8]> + Public + Derive> Ss58Codec for T {
 		let cap = SS58_REGEX.captures(s).ok_or(PublicError::InvalidFormat)?;
 		let s = cap.name("ss58").map(|r| r.as_str()).unwrap_or(DEV_ADDRESS);
 		let addr = if let Some(stripped) = s.strip_prefix("0x") {
-			let d = hex::decode(stripped).map_err(|_| PublicError::InvalidFormat)?;
+			let d = array_bytes::hex2bytes(stripped).map_err(|_| PublicError::InvalidFormat)?;
 			Self::from_slice(&d).map_err(|()| PublicError::BadLength)?
 		} else {
 			Self::from_ss58check(s)?
@@ -614,10 +614,7 @@ impl sp_std::str::FromStr for AccountId32 {
 	fn from_str(s: &str) -> Result<Self, Self::Err> {
 		let hex_or_ss58_without_prefix = s.trim_start_matches("0x");
 		if hex_or_ss58_without_prefix.len() == 64 {
-			let mut bytes = [0u8; 32];
-			hex::decode_to_slice(hex_or_ss58_without_prefix, &mut bytes)
-				.map_err(|_| "invalid hex address.")
-				.map(|_| Self::from(bytes))
+			array_bytes::hex_n_into(hex_or_ss58_without_prefix).map_err(|_| "invalid hex address.")
 		} else {
 			Self::from_ss58check(s).map_err(|_| "invalid ss58 address.")
 		}
@@ -943,7 +940,7 @@ pub trait Pair: CryptoType + Sized + Clone + Send + Sync + 'static {
 			password_override.or_else(|| password.as_ref().map(|p| p.expose_secret().as_str()));

 		let (root, seed) = if let Some(stripped) = phrase.expose_secret().strip_prefix("0x") {
-			hex::decode(stripped)
+			array_bytes::hex2bytes(stripped)
 				.ok()
 				.and_then(|seed_vec| {
 					let mut seed = Self::Seed::default();
@@ -1127,7 +1124,6 @@ pub mod key_types {
 mod tests {
 	use super::*;
 	use crate::DeriveJunction;
-	use hex_literal::hex;

 	#[derive(Clone, Eq, PartialEq, Debug)]
 	enum TestPair {
@@ -1269,7 +1265,7 @@ mod tests {
 	fn interpret_std_seed_should_work() {
 		assert_eq!(
 			TestPair::from_string("0x0123456789abcdef", None),
-			Ok(TestPair::Seed(hex!["0123456789abcdef"][..].to_owned()))
+			Ok(TestPair::Seed(array_bytes::hex2bytes_unchecked("0123456789abcdef")))
 		);
 	}

@@ -229,7 +229,7 @@ impl Serialize for Signature {
 	where
 		S: Serializer,
 	{
-		serializer.serialize_str(&hex::encode(self))
+		serializer.serialize_str(&array_bytes::bytes2hex("", self.as_ref()))
 	}
 }

@@ -239,7 +239,7 @@ impl<'de> Deserialize<'de> for Signature {
 	where
 		D: Deserializer<'de>,
 	{
-		let signature_hex = hex::decode(&String::deserialize(deserializer)?)
+		let signature_hex = array_bytes::hex2bytes(&String::deserialize(deserializer)?)
 			.map_err(|e| de::Error::custom(format!("{:?}", e)))?;
 		Signature::try_from(signature_hex.as_ref())
 			.map_err(|e| de::Error::custom(format!("{:?}", e)))
@@ -597,7 +597,6 @@ mod test {
 		set_default_ss58_version, PublicError, Ss58AddressFormat, Ss58AddressFormatRegistry,
 		DEV_PHRASE,
 	};
-	use hex_literal::hex;
 	use serde_json;

 	#[test]
@@ -612,31 +611,35 @@ mod test {

 	#[test]
 	fn seed_and_derive_should_work() {
-		let seed = hex!("9d61b19deffd5a60ba844af492ec2cc44449c5697b326919703bac031cae7f60");
+		let seed = array_bytes::hex2array_unchecked(
+			"9d61b19deffd5a60ba844af492ec2cc44449c5697b326919703bac031cae7f60",
+		);
 		let pair = Pair::from_seed(&seed);
 		assert_eq!(pair.seed(), seed);
 		let path = vec![DeriveJunction::Hard([0u8; 32])];
 		let derived = pair.derive(path.into_iter(), None).ok().unwrap();
 		assert_eq!(
 			derived.0.seed(),
-			hex!("b8eefc4937200a8382d00050e050ced2d4ab72cc2ef1b061477afb51564fdd61")
+			array_bytes::hex2array_unchecked::<32>(
+				"b8eefc4937200a8382d00050e050ced2d4ab72cc2ef1b061477afb51564fdd61"
+			)
 		);
 	}

 	#[test]
 	fn test_vector_should_work() {
-		let pair = Pair::from_seed(&hex!(
-			"9d61b19deffd5a60ba844af492ec2cc44449c5697b326919703bac031cae7f60"
+		let pair = Pair::from_seed(&array_bytes::hex2array_unchecked(
+			"9d61b19deffd5a60ba844af492ec2cc44449c5697b326919703bac031cae7f60",
 		));
 		let public = pair.public();
 		assert_eq!(
 			public,
 			Public::from_full(
-				&hex!("8db55b05db86c0b1786ca49f095d76344c9e6056b2f02701a7e7f3c20aabfd913ebbe148dd17c56551a52952371071a6c604b3f3abe8f2c8fa742158ea6dd7d4")[..],
+				&array_bytes::hex2bytes_unchecked("8db55b05db86c0b1786ca49f095d76344c9e6056b2f02701a7e7f3c20aabfd913ebbe148dd17c56551a52952371071a6c604b3f3abe8f2c8fa742158ea6dd7d4"),
 			).unwrap(),
 		);
 		let message = b"";
-		let signature = hex!("3dde91174bd9359027be59a428b8146513df80a2a3c7eda2194f64de04a69ab97b753169e94db6ffd50921a2668a48b94ca11e3d32c1ff19cfe88890aa7e8f3c00");
+		let signature = array_bytes::hex2array_unchecked("3dde91174bd9359027be59a428b8146513df80a2a3c7eda2194f64de04a69ab97b753169e94db6ffd50921a2668a48b94ca11e3d32c1ff19cfe88890aa7e8f3c00");
 		let signature = Signature::from_raw(signature);
 		assert!(pair.sign(&message[..]) == signature);
 		assert!(Pair::verify(&signature, &message[..], &public));
@@ -653,11 +656,11 @@ mod test {
 		assert_eq!(
 			public,
 			Public::from_full(
-				&hex!("8db55b05db86c0b1786ca49f095d76344c9e6056b2f02701a7e7f3c20aabfd913ebbe148dd17c56551a52952371071a6c604b3f3abe8f2c8fa742158ea6dd7d4")[..],
+				&array_bytes::hex2bytes_unchecked("8db55b05db86c0b1786ca49f095d76344c9e6056b2f02701a7e7f3c20aabfd913ebbe148dd17c56551a52952371071a6c604b3f3abe8f2c8fa742158ea6dd7d4"),
 			).unwrap(),
 		);
 		let message = b"";
-		let signature = hex!("3dde91174bd9359027be59a428b8146513df80a2a3c7eda2194f64de04a69ab97b753169e94db6ffd50921a2668a48b94ca11e3d32c1ff19cfe88890aa7e8f3c00");
+		let signature = array_bytes::hex2array_unchecked("3dde91174bd9359027be59a428b8146513df80a2a3c7eda2194f64de04a69ab97b753169e94db6ffd50921a2668a48b94ca11e3d32c1ff19cfe88890aa7e8f3c00");
 		let signature = Signature::from_raw(signature);
 		assert!(pair.sign(&message[..]) == signature);
 		assert!(Pair::verify(&signature, &message[..], &public));
@@ -680,10 +683,10 @@ mod test {
 		assert_eq!(
 			public,
 			Public::from_full(
-				&hex!("5676109c54b9a16d271abeb4954316a40a32bcce023ac14c8e26e958aa68fba995840f3de562156558efbfdac3f16af0065e5f66795f4dd8262a228ef8c6d813")[..],
+				&array_bytes::hex2bytes_unchecked("5676109c54b9a16d271abeb4954316a40a32bcce023ac14c8e26e958aa68fba995840f3de562156558efbfdac3f16af0065e5f66795f4dd8262a228ef8c6d813"),
 			).unwrap(),
 		);
-		let message = hex!("2f8c6129d816cf51c374bc7f08c3e63ed156cf78aefb4a6550d97b87997977ee00000000000000000200d75a980182b10ab7d54bfed3c964073a0ee172f3daa62325af021a68f707511a4500000000000000");
+		let message = array_bytes::hex2bytes_unchecked("2f8c6129d816cf51c374bc7f08c3e63ed156cf78aefb4a6550d97b87997977ee00000000000000000200d75a980182b10ab7d54bfed3c964073a0ee172f3daa62325af021a68f707511a4500000000000000");
 		let signature = pair.sign(&message[..]);
 		println!("Correct signature: {:?}", signature);
 		assert!(Pair::verify(&signature, &message[..], &public));
@@ -228,7 +228,7 @@ impl Serialize for Signature {
 	where
 		S: Serializer,
 	{
-		serializer.serialize_str(&hex::encode(self))
+		serializer.serialize_str(&array_bytes::bytes2hex("", self.as_ref()))
 	}
 }

@@ -238,7 +238,7 @@ impl<'de> Deserialize<'de> for Signature {
 	where
 		D: Deserializer<'de>,
 	{
-		let signature_hex = hex::decode(&String::deserialize(deserializer)?)
+		let signature_hex = array_bytes::hex2bytes(&String::deserialize(deserializer)?)
 			.map_err(|e| de::Error::custom(format!("{:?}", e)))?;
 		Signature::try_from(signature_hex.as_ref())
 			.map_err(|e| de::Error::custom(format!("{:?}", e)))
@@ -551,7 +551,6 @@ impl CryptoType for Pair {
 mod test {
 	use super::*;
 	use crate::crypto::DEV_PHRASE;
-	use hex_literal::hex;
 	use serde_json;

 	#[test]
@@ -566,31 +565,35 @@ mod test {

 	#[test]
 	fn seed_and_derive_should_work() {
-		let seed = hex!("9d61b19deffd5a60ba844af492ec2cc44449c5697b326919703bac031cae7f60");
+		let seed = array_bytes::hex2array_unchecked(
+			"9d61b19deffd5a60ba844af492ec2cc44449c5697b326919703bac031cae7f60",
+		);
 		let pair = Pair::from_seed(&seed);
 		assert_eq!(pair.seed(), seed);
 		let path = vec![DeriveJunction::Hard([0u8; 32])];
 		let derived = pair.derive(path.into_iter(), None).ok().unwrap().0;
 		assert_eq!(
 			derived.seed(),
-			hex!("ede3354e133f9c8e337ddd6ee5415ed4b4ffe5fc7d21e933f4930a3730e5b21c")
+			array_bytes::hex2array_unchecked::<32>(
+				"ede3354e133f9c8e337ddd6ee5415ed4b4ffe5fc7d21e933f4930a3730e5b21c"
+			)
 		);
 	}

 	#[test]
 	fn test_vector_should_work() {
-		let pair = Pair::from_seed(&hex!(
-			"9d61b19deffd5a60ba844af492ec2cc44449c5697b326919703bac031cae7f60"
+		let pair = Pair::from_seed(&array_bytes::hex2array_unchecked(
+			"9d61b19deffd5a60ba844af492ec2cc44449c5697b326919703bac031cae7f60",
 		));
 		let public = pair.public();
 		assert_eq!(
 			public,
-			Public::from_raw(hex!(
+			Public::from_raw(array_bytes::hex2array_unchecked(
 				"d75a980182b10ab7d54bfed3c964073a0ee172f3daa62325af021a68f707511a"
 			))
 		);
 		let message = b"";
-		let signature = hex!("e5564300c360ac729086e2cc806e828a84877f1eb8e5d974d873e065224901555fb8821590a33bacc61e39701cf9b46bd25bf5f0595bbe24655141438e7a100b");
+		let signature = array_bytes::hex2array_unchecked("e5564300c360ac729086e2cc806e828a84877f1eb8e5d974d873e065224901555fb8821590a33bacc61e39701cf9b46bd25bf5f0595bbe24655141438e7a100b");
 		let signature = Signature::from_raw(signature);
 		assert!(pair.sign(&message[..]) == signature);
 		assert!(Pair::verify(&signature, &message[..], &public));
@@ -606,12 +609,12 @@ mod test {
 		let public = pair.public();
 		assert_eq!(
 			public,
-			Public::from_raw(hex!(
+			Public::from_raw(array_bytes::hex2array_unchecked(
 				"d75a980182b10ab7d54bfed3c964073a0ee172f3daa62325af021a68f707511a"
 			))
 		);
 		let message = b"";
-		let signature = hex!("e5564300c360ac729086e2cc806e828a84877f1eb8e5d974d873e065224901555fb8821590a33bacc61e39701cf9b46bd25bf5f0595bbe24655141438e7a100b");
+		let signature = array_bytes::hex2array_unchecked("e5564300c360ac729086e2cc806e828a84877f1eb8e5d974d873e065224901555fb8821590a33bacc61e39701cf9b46bd25bf5f0595bbe24655141438e7a100b");
 		let signature = Signature::from_raw(signature);
 		assert!(pair.sign(&message[..]) == signature);
 		assert!(Pair::verify(&signature, &message[..], &public));
@@ -633,11 +636,11 @@ mod test {
 		let public = pair.public();
 		assert_eq!(
 			public,
-			Public::from_raw(hex!(
+			Public::from_raw(array_bytes::hex2array_unchecked(
 				"2f8c6129d816cf51c374bc7f08c3e63ed156cf78aefb4a6550d97b87997977ee"
 			))
 		);
-		let message = hex!("2f8c6129d816cf51c374bc7f08c3e63ed156cf78aefb4a6550d97b87997977ee00000000000000000200d75a980182b10ab7d54bfed3c964073a0ee172f3daa62325af021a68f707511a4500000000000000");
+		let message = array_bytes::hex2bytes_unchecked("2f8c6129d816cf51c374bc7f08c3e63ed156cf78aefb4a6550d97b87997977ee00000000000000000200d75a980182b10ab7d54bfed3c964073a0ee172f3daa62325af021a68f707511a4500000000000000");
 		let signature = pair.sign(&message[..]);
 		println!("Correct signature: {:?}", signature);
 		assert!(Pair::verify(&signature, &message[..], &public));
@@ -233,7 +233,7 @@ impl Serialize for Signature {
 	where
 		S: Serializer,
 	{
-		serializer.serialize_str(&hex::encode(self))
+		serializer.serialize_str(&array_bytes::bytes2hex("", self.as_ref()))
 	}
 }

@@ -243,7 +243,7 @@ impl<'de> Deserialize<'de> for Signature {
 	where
 		D: Deserializer<'de>,
 	{
-		let signature_hex = hex::decode(&String::deserialize(deserializer)?)
+		let signature_hex = array_bytes::hex2bytes(&String::deserialize(deserializer)?)
 			.map_err(|e| de::Error::custom(format!("{:?}", e)))?;
 		Signature::try_from(signature_hex.as_ref())
 			.map_err(|e| de::Error::custom(format!("{:?}", e)))
@@ -664,7 +664,6 @@ pub fn verify_batch(
 mod compatibility_test {
 	use super::*;
 	use crate::crypto::DEV_PHRASE;
-	use hex_literal::hex;

 	// NOTE: tests to ensure addresses that are created with the `0.1.x` version (pre-audit) are
 	// still functional.
@@ -673,7 +672,9 @@ mod compatibility_test {
 	fn derive_soft_known_pair_should_work() {
 		let pair = Pair::from_string(&format!("{}/Alice", DEV_PHRASE), None).unwrap();
 		// known address of DEV_PHRASE with 1.1
-		let known = hex!("d6c71059dbbe9ad2b0ed3f289738b800836eb425544ce694825285b958ca755e");
+		let known = array_bytes::hex2bytes_unchecked(
+			"d6c71059dbbe9ad2b0ed3f289738b800836eb425544ce694825285b958ca755e",
+		);
 		assert_eq!(pair.public().to_raw_vec(), known);
 	}

@@ -681,17 +682,19 @@ mod compatibility_test {
 	fn derive_hard_known_pair_should_work() {
 		let pair = Pair::from_string(&format!("{}//Alice", DEV_PHRASE), None).unwrap();
 		// known address of DEV_PHRASE with 1.1
-		let known = hex!("d43593c715fdd31c61141abd04a99fd6822c8558854ccde39a5684e7a56da27d");
+		let known = array_bytes::hex2bytes_unchecked(
+			"d43593c715fdd31c61141abd04a99fd6822c8558854ccde39a5684e7a56da27d",
+		);
 		assert_eq!(pair.public().to_raw_vec(), known);
 	}

 	#[test]
 	fn verify_known_old_message_should_work() {
-		let public = Public::from_raw(hex!(
-			"b4bfa1f7a5166695eb75299fd1c4c03ea212871c342f2c5dfea0902b2c246918"
+		let public = Public::from_raw(array_bytes::hex2array_unchecked(
+			"b4bfa1f7a5166695eb75299fd1c4c03ea212871c342f2c5dfea0902b2c246918",
 		));
 		// signature generated by the 1.1 version with the same ^^ public key.
-		let signature = Signature::from_raw(hex!(
+		let signature = Signature::from_raw(array_bytes::hex2array_unchecked(
 			"5a9755f069939f45d96aaf125cf5ce7ba1db998686f87f2fb3cbdea922078741a73891ba265f70c31436e18a9acd14d189d73c12317ab6c313285cd938453202"
 		));
 		let message = b"Verifying that I am the owner of 5G9hQLdsKQswNPgB499DeA5PkFBbgkLPJWkkS6FAM6xGQ8xD. Hash: 221455a3\n";
@@ -704,7 +707,6 @@ mod compatibility_test {
 mod test {
 	use super::*;
 	use crate::crypto::{Ss58Codec, DEV_ADDRESS, DEV_PHRASE};
-	use hex_literal::hex;
 	use serde_json;

 	#[test]
@@ -745,8 +747,8 @@ mod test {

 	#[test]
 	fn derive_soft_should_work() {
-		let pair = Pair::from_seed(&hex!(
-			"9d61b19deffd5a60ba844af492ec2cc44449c5697b326919703bac031cae7f60"
+		let pair = Pair::from_seed(&array_bytes::hex2array_unchecked(
+			"9d61b19deffd5a60ba844af492ec2cc44449c5697b326919703bac031cae7f60",
 		));
 		let derive_1 = pair.derive(Some(DeriveJunction::soft(1)).into_iter(), None).unwrap().0;
 		let derive_1b = pair.derive(Some(DeriveJunction::soft(1)).into_iter(), None).unwrap().0;
@@ -757,8 +759,8 @@ mod test {

 	#[test]
 	fn derive_hard_should_work() {
-		let pair = Pair::from_seed(&hex!(
-			"9d61b19deffd5a60ba844af492ec2cc44449c5697b326919703bac031cae7f60"
+		let pair = Pair::from_seed(&array_bytes::hex2array_unchecked(
+			"9d61b19deffd5a60ba844af492ec2cc44449c5697b326919703bac031cae7f60",
 		));
 		let derive_1 = pair.derive(Some(DeriveJunction::hard(1)).into_iter(), None).unwrap().0;
 		let derive_1b = pair.derive(Some(DeriveJunction::hard(1)).into_iter(), None).unwrap().0;
@@ -769,8 +771,8 @@ mod test {

 	#[test]
 	fn derive_soft_public_should_work() {
-		let pair = Pair::from_seed(&hex!(
-			"9d61b19deffd5a60ba844af492ec2cc44449c5697b326919703bac031cae7f60"
+		let pair = Pair::from_seed(&array_bytes::hex2array_unchecked(
+			"9d61b19deffd5a60ba844af492ec2cc44449c5697b326919703bac031cae7f60",
 		));
 		let path = Some(DeriveJunction::soft(1));
 		let pair_1 = pair.derive(path.into_iter(), None).unwrap().0;
@@ -780,8 +782,8 @@ mod test {

 	#[test]
 	fn derive_hard_public_should_fail() {
-		let pair = Pair::from_seed(&hex!(
-			"9d61b19deffd5a60ba844af492ec2cc44449c5697b326919703bac031cae7f60"
+		let pair = Pair::from_seed(&array_bytes::hex2array_unchecked(
+			"9d61b19deffd5a60ba844af492ec2cc44449c5697b326919703bac031cae7f60",
 		));
 		let path = Some(DeriveJunction::hard(1));
 		assert!(pair.public().derive(path.into_iter()).is_none());
@@ -789,13 +791,13 @@ mod test {

 	#[test]
 	fn sr_test_vector_should_work() {
-		let pair = Pair::from_seed(&hex!(
-			"9d61b19deffd5a60ba844af492ec2cc44449c5697b326919703bac031cae7f60"
+		let pair = Pair::from_seed(&array_bytes::hex2array_unchecked(
+			"9d61b19deffd5a60ba844af492ec2cc44449c5697b326919703bac031cae7f60",
 		));
 		let public = pair.public();
 		assert_eq!(
 			public,
-			Public::from_raw(hex!(
+			Public::from_raw(array_bytes::hex2array_unchecked(
 				"44a996beb1eef7bdcab976ab6d2ca26104834164ecf28fb375600576fcc6eb0f"
 			))
 		);
@@ -840,11 +842,11 @@ mod test {
 		let public = pair.public();
 		assert_eq!(
 			public,
-			Public::from_raw(hex!(
+			Public::from_raw(array_bytes::hex2array_unchecked(
 				"741c08a06f41c596608f6774259bd9043304adfa5d3eea62760bd9be97634d63"
 			))
 		);
-		let message = hex!("2f8c6129d816cf51c374bc7f08c3e63ed156cf78aefb4a6550d97b87997977ee00000000000000000200d75a980182b10ab7d54bfed3c964073a0ee172f3daa62325af021a68f707511a4500000000000000");
+		let message = array_bytes::hex2bytes_unchecked("2f8c6129d816cf51c374bc7f08c3e63ed156cf78aefb4a6550d97b87997977ee00000000000000000200d75a980182b10ab7d54bfed3c964073a0ee172f3daa62325af021a68f707511a4500000000000000");
 		let signature = pair.sign(&message[..]);
 		assert!(Pair::verify(&signature, &message[..], &public));
 	}
@@ -865,11 +867,11 @@ mod test {
 		// schnorrkel-js.
 		//
 		// This is to make sure that the wasm library is compatible.
-		let pk = Pair::from_seed(&hex!(
-			"0000000000000000000000000000000000000000000000000000000000000000"
+		let pk = Pair::from_seed(&array_bytes::hex2array_unchecked(
+			"0000000000000000000000000000000000000000000000000000000000000000",
 		));
 		let public = pk.public();
-		let js_signature = Signature::from_raw(hex!(
+		let js_signature = Signature::from_raw(array_bytes::hex2array_unchecked(
 			"28a854d54903e056f89581c691c1f7d2ff39f8f896c9e9c22475e60902cc2b3547199e0e91fa32902028f2ca2355e8cdd16cfe19ba5e8b658c94aa80f3b81a00"
 		));
 		assert!(Pair::verify_deprecated(&js_signature, b"SUBSTRATE", &public));
@@ -22,7 +22,7 @@ sp-runtime = { version = "6.0.0", default-features = false, path = "../runtime"
 sp-std = { version = "4.0.0", default-features = false, path = "../std" }

 [dev-dependencies]
-hex-literal = "0.3"
+array-bytes = "4.1"

 [features]
 default = ["std"]
@@ -535,11 +535,16 @@ mod tests {
 			cases.into_iter().map(Result::<_, codec::Error>::Ok).collect::<Vec<_>>()
 		);
 		// check encoding correctness
-		assert_eq!(&encoded[0], &hex_literal::hex!("00343048656c6c6f20576f726c6421"));
+		assert_eq!(
+			&encoded[0],
+			&array_bytes::hex2bytes_unchecked("00343048656c6c6f20576f726c6421")
+		);
 		assert_eq!(
 			encoded[1].as_slice(),
-			hex_literal::hex!("01c3e7ba6b511162fead58f2c8b5764ce869ed1118011ac37392522ed16720bbcd")
-				.as_ref()
+			array_bytes::hex2bytes_unchecked(
+				"01c3e7ba6b511162fead58f2c8b5764ce869ed1118011ac37392522ed16720bbcd"
+			)
+			.as_slice()
 		);
 	}

@@ -31,7 +31,7 @@ sp-std = { version = "4.0.0", default-features = false, path = "../std" }
 sp-trie = { version = "6.0.0", default-features = false, path = "../trie" }

 [dev-dependencies]
-hex-literal = "0.3.4"
+array-bytes = "4.1"
 pretty_assertions = "1.2.1"
 rand = "0.7.2"
 sp-runtime = { version = "6.0.0", path = "../runtime" }
@@ -356,7 +356,6 @@ impl sp_externalities::ExtensionStore for BasicExternalities {
 #[cfg(test)]
 mod tests {
 	use super::*;
-	use hex_literal::hex;
 	use sp_core::{
 		map,
 		storage::{well_known_keys::CODE, Storage, StorageChild},
@@ -368,10 +367,11 @@ mod tests {
 		ext.set_storage(b"doe".to_vec(), b"reindeer".to_vec());
 		ext.set_storage(b"dog".to_vec(), b"puppy".to_vec());
 		ext.set_storage(b"dogglesworth".to_vec(), b"cat".to_vec());
-		const ROOT: [u8; 32] =
-			hex!("39245109cef3758c2eed2ccba8d9b370a917850af3824bc8348d505df2c298fa");
+		let root = array_bytes::hex2bytes_unchecked(
+			"39245109cef3758c2eed2ccba8d9b370a917850af3824bc8348d505df2c298fa",
+		);

-		assert_eq!(&ext.storage_root(StateVersion::default())[..], &ROOT);
+		assert_eq!(&ext.storage_root(StateVersion::default())[..], &root);
 	}

 	#[test]
@@ -743,7 +743,6 @@ impl<'a> OverlayedExtensions<'a> {
 mod tests {
 	use super::*;
 	use crate::{ext::Ext, InMemoryBackend};
-	use hex_literal::hex;
 	use sp_core::{traits::Externalities, Blake2Hasher};
 	use std::collections::BTreeMap;

@@ -870,10 +869,11 @@ mod tests {

 		let mut cache = StorageTransactionCache::default();
 		let mut ext = Ext::new(&mut overlay, &mut cache, &backend, None);
-		const ROOT: [u8; 32] =
-			hex!("39245109cef3758c2eed2ccba8d9b370a917850af3824bc8348d505df2c298fa");
+		let root = array_bytes::hex2bytes_unchecked(
+			"39245109cef3758c2eed2ccba8d9b370a917850af3824bc8348d505df2c298fa",
+		);

-		assert_eq!(&ext.storage_root(state_version)[..], &ROOT);
+		assert_eq!(&ext.storage_root(state_version)[..], &root);
 	}

 	#[test]
@@ -334,7 +334,6 @@ where
 #[cfg(test)]
 mod tests {
 	use super::*;
-	use hex_literal::hex;
 	use sp_core::{storage::ChildInfo, traits::Externalities, H256};
 	use sp_runtime::traits::BlakeTwo256;

@@ -346,8 +345,9 @@ mod tests {
 		ext.set_storage(b"doe".to_vec(), b"reindeer".to_vec());
 		ext.set_storage(b"dog".to_vec(), b"puppy".to_vec());
 		ext.set_storage(b"dogglesworth".to_vec(), b"cat".to_vec());
-		let root =
-			H256::from(hex!("ed4d8c799d996add422395a6abd7545491d40bd838d738afafa1b8a4de625489"));
+		let root = array_bytes::hex_n_into_unchecked::<H256, 32>(
+			"ed4d8c799d996add422395a6abd7545491d40bd838d738afafa1b8a4de625489",
+		);
 		assert_eq!(H256::from_slice(ext.storage_root(Default::default()).as_slice()), root);
 	}

@@ -36,8 +36,8 @@ sp-core = { version = "6.0.0", default-features = false, path = "../core" }
 sp-std = { version = "4.0.0", default-features = false, path = "../std" }

 [dev-dependencies]
+array-bytes = "4.1"
 criterion = "0.3.3"
-hex-literal = "0.3.4"
 trie-bench = "0.31.0"
 trie-standardmap = "0.15.2"
 sp-runtime = { version = "6.0.0", path = "../runtime" }
@@ -542,7 +542,6 @@ mod tests {
 	use super::*;
 	use codec::{Compact, Decode, Encode};
 	use hash_db::{HashDB, Hasher};
-	use hex_literal::hex;
 	use sp_core::Blake2Hasher;
 	use trie_db::{DBValue, NodeCodec as NodeCodecT, Trie, TrieMut};
 	use trie_standardmap::{Alphabet, StandardMap, ValueMode};
@@ -845,8 +844,14 @@ mod tests {
 	}
 	fn iterator_works_inner<Layout: TrieConfiguration>() {
 		let pairs = vec![
-			(hex!("0103000000000000000464").to_vec(), hex!("0400000000").to_vec()),
-			(hex!("0103000000000000000469").to_vec(), hex!("0401000000").to_vec()),
+			(
+				array_bytes::hex2bytes_unchecked("0103000000000000000464"),
+				array_bytes::hex2bytes_unchecked("0400000000"),
+			),
+			(
+				array_bytes::hex2bytes_unchecked("0103000000000000000469"),
+				array_bytes::hex2bytes_unchecked("0401000000"),
+			),
 		];

 		let mut mdb = MemoryDB::default();
@@ -859,7 +864,7 @@ mod tests {
 		let mut iter_pairs = Vec::new();
 		for pair in iter {
 			let (key, value) = pair.unwrap();
-			iter_pairs.push((key, value.to_vec()));
+			iter_pairs.push((key, value));
 		}

 		assert_eq!(pairs, iter_pairs);
@@ -868,15 +873,15 @@ mod tests {
 	#[test]
 	fn proof_non_inclusion_works() {
 		let pairs = vec![
-			(hex!("0102").to_vec(), hex!("01").to_vec()),
-			(hex!("0203").to_vec(), hex!("0405").to_vec()),
+			(array_bytes::hex2bytes_unchecked("0102"), array_bytes::hex2bytes_unchecked("01")),
+			(array_bytes::hex2bytes_unchecked("0203"), array_bytes::hex2bytes_unchecked("0405")),
 		];

 		let mut memdb = MemoryDB::default();
 		let mut root = Default::default();
 		populate_trie::<LayoutV1>(&mut memdb, &mut root, &pairs);

-		let non_included_key: Vec<u8> = hex!("0909").to_vec();
+		let non_included_key: Vec<u8> = array_bytes::hex2bytes_unchecked("0909");
 		let proof =
 			generate_trie_proof::<LayoutV1, _, _, _>(&memdb, root, &[non_included_key.clone()])
 				.unwrap();
@@ -893,7 +898,7 @@ mod tests {
 		assert!(verify_trie_proof::<LayoutV1, _, _, Vec<u8>>(
 			&root,
 			&proof,
-			&[(non_included_key, Some(hex!("1010").to_vec()))],
+			&[(non_included_key, Some(array_bytes::hex2bytes_unchecked("1010")))],
 		)
 		.is_err());
 	}
@@ -901,8 +906,8 @@ mod tests {
 	#[test]
 	fn proof_inclusion_works() {
 		let pairs = vec![
-			(hex!("0102").to_vec(), hex!("01").to_vec()),
-			(hex!("0203").to_vec(), hex!("0405").to_vec()),
+			(array_bytes::hex2bytes_unchecked("0102"), array_bytes::hex2bytes_unchecked("01")),
+			(array_bytes::hex2bytes_unchecked("0203"), array_bytes::hex2bytes_unchecked("0405")),
 		];

 		let mut memdb = MemoryDB::default();
@@ -932,7 +937,7 @@ mod tests {
 		assert!(verify_trie_proof::<LayoutV1, _, _, _>(
 			&root,
 			&proof,
-			&[(hex!("4242").to_vec(), Some(pairs[0].1.clone()))]
+			&[(array_bytes::hex2bytes_unchecked("4242"), Some(pairs[0].1.clone()))]
 		)
 		.is_err());

@@ -12,10 +12,10 @@ publish = false
 targets = ["x86_64-unknown-linux-gnu"]

 [dependencies]
+array-bytes = "4.1"
 async-trait = "0.1.57"
 codec = { package = "parity-scale-codec", version = "3.0.0" }
 futures = "0.3.21"
-hex = "0.4"
 serde = "1.0.136"
 serde_json = "1.0.85"
 sc-client-api = { version = "4.0.0-dev", path = "../../client/api" }
@@ -346,7 +346,7 @@ impl RpcHandlersExt for RpcHandlers {
 						"params": ["0x{}"],
 						"id": 0
 					}}"#,
-				hex::encode(extrinsic.encode())
+				array_bytes::bytes2hex("", &extrinsic.encode())
 			))
 			.await
 			.expect("valid JSON-RPC request object; qed");
@@ -13,13 +13,13 @@ readme = "README.md"
 targets = ["x86_64-unknown-linux-gnu"]

 [dependencies]
+array-bytes = "4.1"
 chrono = "0.4"
 clap = { version = "3.1.18", features = ["derive"] }
 codec = { package = "parity-scale-codec", version = "3.0.0" }
 comfy-table = { version = "6.0.0", default-features = false }
 handlebars = "4.2.2"
 hash-db = "0.15.2"
-hex = "0.4.3"
 Inflector = "0.11.4"
 itertools = "0.10.3"
 kvdb = "0.11.0"
@@ -131,7 +131,9 @@ where
 	fn consumed_weight(&self, block: &BlockId<Block>) -> Result<NanoSeconds> {
 		// Hard-coded key for System::BlockWeight. It could also be passed in as argument
 		// for the benchmark, but I think this should work as well.
-		let hash = hex::decode("26aa394eea5630e07c48ae0c9558cef734abf5cb34d6244378cddbf18e849d96")?;
+		let hash = array_bytes::hex2bytes(
+			"26aa394eea5630e07c48ae0c9558cef734abf5cb34d6244378cddbf18e849d96",
+		)?;
 		let key = StorageKey(hash);

 		let mut raw_weight = &self