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https://github.com/pezkuwichain/pezkuwi-subxt.git
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PG Herveou
64effd0e6f
Small PR that introduce a new crate that will host RISC-V & wasm fixtures for testing pallet-contracts
56 lines
1.7 KiB
WebAssembly Text Format
56 lines
1.7 KiB
WebAssembly Text Format
;; This contract:
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;; 1) Reads signature, message and public key from the input
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;; 2) Calls and return the result of sr25519_verify
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(module
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;; import the host functions from the seal0 module
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(import "seal0" "sr25519_verify" (func $sr25519_verify (param i32 i32 i32 i32) (result i32)))
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(import "seal0" "seal_input" (func $seal_input (param i32 i32)))
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(import "seal0" "seal_return" (func $seal_return (param i32 i32 i32)))
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;; give the program 1 page of memory
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(import "env" "memory" (memory 1 1))
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;; [0, 4) length of signature + message + public key - 64 + 11 + 32 = 107 bytes
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;; write the length of the input (6b = 107) bytes at offset 0
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(data (i32.const 0) "\6b")
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(func (export "deploy"))
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(func (export "call")
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;; define local variables
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(local $signature_ptr i32)
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(local $pub_key_ptr i32)
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(local $message_len i32)
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(local $message_ptr i32)
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;; set the pointers to the memory locations
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;; Memory layout during `call`
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;; [10, 74) signature
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;; [74, 106) public key
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;; [106, 117) message (11 bytes)
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(local.set $signature_ptr (i32.const 10))
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(local.set $pub_key_ptr (i32.const 74))
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(local.set $message_ptr (i32.const 106))
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;; store the input into the memory, starting at the signature and
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;; up to 107 bytes stored at offset 0
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(call $seal_input (local.get $signature_ptr) (i32.const 0))
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;; call sr25519_verify and store the return code
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(i32.store
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(i32.const 0)
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(call $sr25519_verify
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(local.get $signature_ptr)
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(local.get $pub_key_ptr)
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(i32.const 11)
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(local.get $message_ptr)
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)
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)
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;; exit with success and take transfer return code to the output buffer
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(call $seal_return (i32.const 0) (i32.const 0) (i32.const 4))
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)
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)
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