Additional externs for ecdsa recovery and keccak (#1583)

* Additional externs for ecdsa recovery and keccak

* Update core/executor/src/wasm_executor.rs

Co-Authored-By: gavofyork <github@gavwood.com>

* Update core/executor/src/wasm_executor.rs

Co-Authored-By: gavofyork <github@gavwood.com>

* Fix grumble

* Grumble.

substrate/core/executor/Cargo.toml

@@ -20,6 +20,8 @@ lazy_static = "1.0"
 parking_lot = "0.7.1"
 log = "0.4"
 fnv = "1.0.6"
+libsecp256k1 = "0.2.1"
+tiny-keccak = "1.4.2"
 
 [dev-dependencies]
 assert_matches = "1.1"

substrate/core/executor/src/lib.rs

@@ -28,6 +28,8 @@
 #![warn(missing_docs)]
 #![recursion_limit="128"]
 
+extern crate tiny_keccak;
+extern crate secp256k1;
 extern crate parity_codec as codec;
 extern crate sr_io as runtime_io;
 #[cfg_attr(test, macro_use)]

substrate/core/executor/src/wasm_executor.rs

@@ -17,6 +17,8 @@
 //! Rust implementation of Substrate contracts.
 
 use std::collections::HashMap;
+use tiny_keccak;
+use secp256k1;
 
 use wasmi::{
 	Module, ModuleInstance, MemoryInstance, MemoryRef, TableRef, ImportsBuilder, ModuleRef,
@@ -420,7 +422,7 @@ impl_function_executor!(this: FunctionExecutor<'e, E>,
 		Ok(this.ext.chain_id())
 	},
 	ext_twox_128(data: *const u8, len: u32, out: *mut u8) => {
-		let result = if len == 0 {
+		let result: [u8; 16] = if len == 0 {
 			let hashed = twox_128(&[0u8; 0]);
 			debug_trace!(target: "xxhash", "XXhash: '' -> {}", HexDisplay::from(&hashed));
 			this.hash_lookup.insert(hashed.to_vec(), vec![]);
@@ -444,7 +446,7 @@ impl_function_executor!(this: FunctionExecutor<'e, E>,
 		Ok(())
 	},
 	ext_twox_256(data: *const u8, len: u32, out: *mut u8) => {
-		let result = if len == 0 {
+		let result: [u8; 32] = if len == 0 {
 			twox_256(&[0u8; 0])
 		} else {
 			twox_256(&this.memory.get(data, len as usize).map_err(|_| UserError("Invalid attempt to get data in ext_twox_256"))?)
@@ -453,7 +455,7 @@ impl_function_executor!(this: FunctionExecutor<'e, E>,
 		Ok(())
 	},
 	ext_blake2_256(data: *const u8, len: u32, out: *mut u8) => {
-		let result = if len == 0 {
+		let result: [u8; 32] = if len == 0 {
 			blake2_256(&[0u8; 0])
 		} else {
 			blake2_256(&this.memory.get(data, len as usize).map_err(|_| UserError("Invalid attempt to get data in ext_blake2_256"))?)
@@ -461,6 +463,15 @@ impl_function_executor!(this: FunctionExecutor<'e, E>,
 		this.memory.set(out, &result).map_err(|_| UserError("Invalid attempt to set result in ext_blake2_256"))?;
 		Ok(())
 	},
+	ext_keccak_256(data: *const u8, len: u32, out: *mut u8) => {
+		let result: [u8; 32] = if len == 0 {
+			tiny_keccak::keccak256(&[0u8; 0])
+		} else {
+			tiny_keccak::keccak256(&this.memory.get(data, len as usize).map_err(|_| UserError("Invalid attempt to get data in ext_keccak_256"))?)
+		};
+		this.memory.set(out, &result).map_err(|_| UserError("Invalid attempt to set result in ext_keccak_256"))?;
+		Ok(())
+	},
 	ext_ed25519_verify(msg_data: *const u8, msg_len: u32, sig_data: *const u8, pubkey_data: *const u8) -> u32 => {
 		let mut sig = [0u8; 64];
 		this.memory.get_into(sig_data, &mut sig[..]).map_err(|_| UserError("Invalid attempt to get signature in ext_ed25519_verify"))?;
@@ -474,6 +485,31 @@ impl_function_executor!(this: FunctionExecutor<'e, E>,
 			5
 		})
 	},
+	ext_secp256k1_ecdsa_recover(msg_data: *const u8, sig_data: *const u8, pubkey_data: *mut u8) -> u32 => {
+		let mut sig = [0u8; 65];
+		this.memory.get_into(sig_data, &mut sig[..]).map_err(|_| UserError("Invalid attempt to get signature in ext_secp256k1_ecdsa_recover"))?;
+		let rs = match secp256k1::Signature::parse_slice(&sig[0..64]) {
+			Ok(rs) => rs,
+			_ => return Ok(1),
+		};
+		let v = match secp256k1::RecoveryId::parse(if sig[64] > 26 { sig[64] - 27 } else { sig[64] } as u8) {
+			Ok(v) => v,
+			_ => return Ok(2),
+		};
+
+
+		let mut msg = [0u8; 32];
+		this.memory.get_into(msg_data, &mut msg[..]).map_err(|_| UserError("Invalid attempt to get message in ext_secp256k1_ecdsa_recover"))?;
+
+		let pubkey = match secp256k1::recover(&secp256k1::Message::parse(&msg), &rs, &v) {
+			Ok(pk) => pk,
+			_ => return Ok(3),
+		};
+
+		this.memory.set(pubkey_data, &pubkey.serialize()[1..65]).map_err(|_| UserError("Invalid attempt to set pubkey in ext_secp256k1_ecdsa_recover"))?;
+
+		Ok(0)
+	},
 	ext_sandbox_instantiate(
 		dispatch_thunk_idx: usize,
 		wasm_ptr: *const u8,

substrate/core/sr-io/Cargo.toml

@@ -12,7 +12,8 @@ sr-std = { path = "../sr-std", default-features = false }
 substrate-primitives = { path = "../primitives", default-features = false }
 parity-codec = { version = "2.2", default-features = false }
 hash-db = { version = "0.9", default-features = false }
-
+libsecp256k1 = { version = "0.2.1", optional = true }
+tiny-keccak = { version = "1.4.2", optional = true }
 environmental = { version = "~1.0", optional = true }
 substrate-state-machine = { path = "../state-machine", optional = true }
 substrate-trie = { path = "../trie", optional = true }
@@ -27,7 +28,9 @@ std = [
 	"hash-db/std",
 	"environmental",
 	"substrate-state-machine",
-	"substrate-trie"
+	"substrate-trie",
+	"libsecp256k1",
+	"tiny-keccak"
 ]
 nightly = []
 strict = []

substrate/core/sr-io/src/lib.rs

@@ -25,6 +25,12 @@
 #![cfg_attr(feature = "std", doc = "Substrate runtime standard library as compiled when linked with Rust's standard library.")]
 #![cfg_attr(not(feature = "std"), doc = "Substrate's runtime standard library as compiled without Rust's standard library.")]
 
+pub enum EcdsaVerifyError {
+	BadRS,
+	BadV,
+	BadSignature,
+}
+
 #[cfg(feature = "std")]
 include!("../with_std.rs");
 

substrate/core/sr-io/with_std.rs

@@ -24,10 +24,14 @@ extern crate substrate_state_machine;
 extern crate substrate_trie as trie;
 extern crate hash_db;
 
+extern crate tiny_keccak;
+extern crate secp256k1;
+
 #[doc(hidden)]
 pub extern crate parity_codec as codec;
 // re-export hashing functions.
 pub use primitives::{blake2_256, twox_128, twox_256, ed25519};
+pub use tiny_keccak::keccak256 as keccak_256;
 
 pub use primitives::{Blake2Hasher};
 // Switch to this after PoC-3
@@ -200,6 +204,18 @@ pub fn ed25519_verify<P: AsRef<[u8]>>(sig: &[u8; 64], msg: &[u8], pubkey: P) ->
 	ed25519::verify(sig, msg, pubkey)
 }
 
+/// Verify and recover a SECP256k1 ECDSA signature.
+/// - `sig` is passed in RSV format. V should be either 0/1 or 27/28.
+/// - returns `Err` if the signatue is bad, otherwise the 64-byte pubkey (doesn't include the 0x04 prefix).
+pub fn secp256k1_ecdsa_recover(sig: &[u8; 65], msg: &[u8; 32]) -> Result<[u8; 64], EcdsaVerifyError> {
+	let rs = secp256k1::Signature::parse_slice(&sig[0..64]).map_err(|_| EcdsaVerifyError::BadRS)?;
+	let v = secp256k1::RecoveryId::parse(if sig[64] > 26 { sig[64] - 27 } else { sig[64] } as u8).map_err(|_| EcdsaVerifyError::BadV)?;
+	let pubkey = secp256k1::recover(&secp256k1::Message::parse(msg), &rs, &v).map_err(|_| EcdsaVerifyError::BadSignature)?;
+	let mut res = [0u8; 64];
+	res.copy_from_slice(&pubkey.serialize()[1..65]);
+	Ok(res)
+}
+
 /// Execute the given closure with global function available whose functionality routes into the
 /// externalities `ext`. Forwards the value that the closure returns.
 // NOTE: need a concrete hasher here due to limitations of the `environmental!` macro, otherwise a type param would have been fine I think.

substrate/core/sr-io/without_std.rs

@@ -91,8 +91,11 @@ extern "C" {
 	fn ext_blake2_256(data: *const u8, len: u32, out: *mut u8);
 	fn ext_twox_128(data: *const u8, len: u32, out: *mut u8);
 	fn ext_twox_256(data: *const u8, len: u32, out: *mut u8);
+	fn ext_keccak_256(data: *const u8, len: u32, out: *mut u8);
 	/// Note: ext_ed25519_verify returns 0 if the signature is correct, nonzero otherwise.
 	fn ext_ed25519_verify(msg_data: *const u8, msg_len: u32, sig_data: *const u8, pubkey_data: *const u8) -> u32;
+	/// Note: ext_secp256k1_ecdsa_recover returns 0 if the signature is correct, nonzero otherwise.
+	fn ext_secp256k1_ecdsa_recover(msg_data: *const u8, sig_data: *const u8, pubkey_data: *mut u8) -> u32;
 }
 
 /// Ensures we use the right crypto when calling into native
@@ -343,6 +346,15 @@ pub fn blake2_256(data: &[u8]) -> [u8; 32] {
 	result
 }
 
+/// Conduct a 256-bit Keccak hash.
+pub fn keccak_256(data: &[u8]) -> [u8; 32] {
+	let mut result: [u8; 32] = Default::default();
+	unsafe {
+		ext_keccak_256(data.as_ptr(), data.len() as u32, result.as_mut_ptr());
+	}
+	result
+}
+
 /// Conduct four XX hashes to give a 256-bit result.
 pub fn twox_256(data: &[u8]) -> [u8; 32] {
 	let mut result: [u8; 32] = Default::default();
@@ -368,6 +380,22 @@ pub fn ed25519_verify<P: AsRef<[u8]>>(sig: &[u8; 64], msg: &[u8], pubkey: P) ->
 	}
 }
 
+/// Verify and recover a SECP256k1 ECDSA signature.
+/// - `sig` is passed in RSV format. V should be either 0/1 or 27/28.
+/// - returns `None` if the signatue is bad, the 64-byte pubkey (doesn't include the 0x04 prefix).
+pub fn secp256k1_ecdsa_recover(sig: &[u8; 65], msg: &[u8; 32]) -> Result<[u8; 64], EcdsaVerifyError> {
+	let mut pubkey = [0u8; 64];
+	match unsafe {
+		ext_secp256k1_ecdsa_recover(msg.as_ptr(), sig.as_ptr(), pubkey.as_mut_ptr())
+	} {
+		0 => Ok(pubkey),
+		1 => Err(EcdsaVerifyError::BadRS),
+		2 => Err(EcdsaVerifyError::BadV),
+		3 => Err(EcdsaVerifyError::BadSignature),
+		_ => unreachable!("`ext_secp256k1_ecdsa_recover` only returns 0, 1, 2 or 3; qed"),
+	}
+}
+
 /// Trait for things which can be printed.
 pub trait Printable {
 	fn print(self);

substrate/core/test-runtime/wasm/Cargo.lock

@@ -1,3 +1,8 @@
+[[package]]
+name = "arrayref"
+version = "0.3.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "arrayvec"
 version = "0.4.8"
@@ -46,6 +51,20 @@ dependencies = [
  "constant_time_eq 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "block-buffer"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "byte-tools 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "generic-array 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "byte-tools"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "byteorder"
 version = "1.2.7"
@@ -138,6 +157,23 @@ name = "crunchy"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "crypto-mac"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "constant_time_eq 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "generic-array 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "digest"
+version = "0.6.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "generic-array 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "elastic-array"
 version = "0.10.0"
@@ -159,6 +195,11 @@ dependencies = [
  "backtrace 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "fake-simd"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "fixed-hash"
 version = "0.3.0"
@@ -209,6 +250,15 @@ name = "futures"
 version = "0.1.25"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "generic-array"
+version = "0.8.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "nodrop 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "typenum 1.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "hash-db"
 version = "0.9.0"
@@ -247,6 +297,26 @@ dependencies = [
  "proc-macro-hack 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "hmac"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "crypto-mac 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "digest 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "generic-array 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "hmac-drbg"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "digest 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "generic-array 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hmac 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "httparse"
 version = "1.3.3"
@@ -336,6 +406,19 @@ name = "libc"
 version = "0.2.44"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "libsecp256k1"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "arrayref 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "digest 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hmac-drbg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sha2 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "typenum 1.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "lock_api"
 version = "0.1.5"
@@ -833,6 +916,18 @@ name = "sha1"
 version = "0.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "sha2"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "block-buffer 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byte-tools 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "digest 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fake-simd 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "generic-array 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "slab"
 version = "0.4.1"
@@ -898,12 +993,14 @@ version = "0.1.0"
 dependencies = [
  "environmental 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "hash-db 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libsecp256k1 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "sr-std 0.1.0",
  "substrate-primitives 0.1.0",
  "substrate-state-machine 0.1.0",
  "substrate-trie 0.4.0",
+ "tiny-keccak 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1079,6 +1176,7 @@ dependencies = [
  "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libsecp256k1 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1090,6 +1188,7 @@ dependencies = [
  "substrate-serializer 0.1.0",
  "substrate-state-machine 0.1.0",
  "substrate-trie 0.4.0",
+ "tiny-keccak 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasmi 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1248,6 +1347,14 @@ dependencies = [
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "tiny-keccak"
+version = "1.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "crunchy 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "tokio"
 version = "0.1.13"
@@ -1430,6 +1537,11 @@ dependencies = [
  "rand 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "typenum"
+version = "1.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "uint"
 version = "0.5.0"
@@ -1559,12 +1671,15 @@ dependencies = [
 ]
 
 [metadata]
+"checksum arrayref 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "0d382e583f07208808f6b1249e60848879ba3543f57c32277bf52d69c2f0f0ee"
 "checksum arrayvec 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)" = "f405cc4c21cd8b784f6c8fc2adf9bc00f59558f0049b5ec21517f875963040cc"
 "checksum backtrace 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)" = "89a47830402e9981c5c41223151efcced65a0510c13097c769cede7efb34782a"
 "checksum backtrace-sys 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)" = "c66d56ac8dabd07f6aacdaf633f4b8262f5b3601a810a0dcddffd5c22c69daa0"
 "checksum base58 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5024ee8015f02155eee35c711107ddd9a9bf3cb689cf2a9089c97e79b6e1ae83"
 "checksum bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "228047a76f468627ca71776ecdebd732a3423081fcf5125585bcd7c49886ce12"
 "checksum blake2-rfc 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)" = "5d6d530bdd2d52966a6d03b7a964add7ae1a288d25214066fd4b600f0f796400"
+"checksum block-buffer 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1339a1042f5d9f295737ad4d9a6ab6bf81c84a933dba110b9200cd6d1448b814"
+"checksum byte-tools 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "560c32574a12a89ecd91f5e742165893f86e3ab98d21f8ea548658eb9eef5f40"
 "checksum byteorder 1.2.7 (registry+https://github.com/rust-lang/crates.io-index)" = "94f88df23a25417badc922ab0f5716cc1330e87f71ddd9203b3a3ccd9cedf75d"
 "checksum bytes 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)" = "40ade3d27603c2cb345eb0912aec461a6dec7e06a4ae48589904e808335c7afa"
 "checksum cc 1.0.25 (registry+https://github.com/rust-lang/crates.io-index)" = "f159dfd43363c4d08055a07703eb7a3406b0dac4d0584d96965a3262db3c9d16"
@@ -1578,9 +1693,12 @@ dependencies = [
 "checksum crossbeam-utils 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "e07fc155212827475223f0bcfae57e945e694fc90950ddf3f6695bbfd5555c72"
 "checksum crunchy 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "a2f4a431c5c9f662e1200b7c7f02c34e91361150e382089a8f2dec3ba680cbda"
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