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core/vm: simplify p256Verify

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This commit is contained in:
Felix Lange 2025-06-11 14:55:45 +02:00
parent 881459ff5e
commit 30057ba7e0
1 changed files with 4 additions and 10 deletions
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14
core/vm/contracts.go
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@ -1253,25 +1253,19 @@ func (c *p256Verify) RequiredGas(input []byte) uint64 {
// Run executes the precompiled contract with given 160 bytes of param, returning the output and the used gas // Run executes the precompiled contract with given 160 bytes of param, returning the output and the used gas
func (c *p256Verify) Run(input []byte) ([]byte, error) { func (c *p256Verify) Run(input []byte) ([]byte, error) {
// Required input length is 160 bytes
const p256VerifyInputLength = 160 const p256VerifyInputLength = 160
// Check the input length
if len(input) != p256VerifyInputLength { if len(input) != p256VerifyInputLength {
// Input length is invalid
return nil, nil return nil, nil
} }
// Extract the hash, r, s, x, y from the input // Extract hash, r, s, x, y from the input.
hash := input[0:32] hash := input[0:32]
r, s := new(big.Int).SetBytes(input[32:64]), new(big.Int).SetBytes(input[64:96]) r, s := new(big.Int).SetBytes(input[32:64]), new(big.Int).SetBytes(input[64:96])
x, y := new(big.Int).SetBytes(input[96:128]), new(big.Int).SetBytes(input[128:160]) x, y := new(big.Int).SetBytes(input[96:128]), new(big.Int).SetBytes(input[128:160])
// Verify the secp256r1 signature // Verify the signature.
if secp256r1.Verify(hash, r, s, x, y) { if secp256r1.Verify(hash, r, s, x, y) {
// Signature is valid return true32Byte, nil
return common.LeftPadBytes(common.Big1.Bytes(), 32), nil }
} else {
// Signature is invalid
return nil, nil return nil, nil
} }
}