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core/vm: force the input length of p256verify

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(cherry picked from commit 21f4932c9b)
This commit is contained in:
Ulaş Erdoğan 2023-09-24 04:42:41 +03:00 committed by Anshal Shukla
parent d64d8e73c1
commit 2bbf30ff90
1 changed files with 6 additions and 4 deletions
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10
core/vm/contracts.go
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@ -1124,13 +1124,15 @@ func (c *p256Verify) RequiredGas(input []byte) uint64 {
return params.P256VerifyGas
}
// Run executes the precompiled contract, 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) {
// Required input length is 160 bytes
const p256VerifyInputLength = 160
// "input" is (hash, r, s, x, y), each 32 bytes
input = common.RightPadBytes(input, p256VerifyInputLength)
// Check the input length
if len(input) != p256VerifyInputLength {
// Input length is invalid
return nil, nil
}
// Extract the hash, r, s, x, y from the input
hash := input[0:32]