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crypto: add SignatureLength constant and use it everywhere (#19996)

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Original change by @jpeletier
This commit is contained in:
Felix Lange
2019-08-22 15:14:06 +02:00
committed by GitHub
parent b90cdbaa79
commit 54b271a86d
11 changed files with 46 additions and 33 deletions
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10
internal/ethapi/api.go
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@ -427,7 +427,7 @@ func (s *PrivateAccountAPI) Sign(ctx context.Context, data hexutil.Bytes, addr c
log.Warn("Failed data sign attempt", "address", addr, "err", err)
return nil, err
}
signature[64] += 27 // Transform V from 0/1 to 27/28 according to the yellow paper
signature[crypto.RecoveryIDOffset] += 27 // Transform V from 0/1 to 27/28 according to the yellow paper
return signature, nil
}
@ -442,13 +442,13 @@ func (s *PrivateAccountAPI) Sign(ctx context.Context, data hexutil.Bytes, addr c
//
// https://github.com/ethereum/go-ethereum/wiki/Management-APIs#personal_ecRecover
func (s *PrivateAccountAPI) EcRecover(ctx context.Context, data, sig hexutil.Bytes) (common.Address, error) {
if len(sig) != 65 {
return common.Address{}, fmt.Errorf("signature must be 65 bytes long")
if len(sig) != crypto.SignatureLength {
return common.Address{}, fmt.Errorf("signature must be %d bytes long", crypto.SignatureLength)
}
if sig[64] != 27 && sig[64] != 28 {
if sig[crypto.RecoveryIDOffset] != 27 && sig[crypto.RecoveryIDOffset] != 28 {
return common.Address{}, fmt.Errorf("invalid Ethereum signature (V is not 27 or 28)")
}
sig[64] -= 27 // Transform yellow paper V from 27/28 to 0/1
sig[crypto.RecoveryIDOffset] -= 27 // Transform yellow paper V from 27/28 to 0/1
rpk, err := crypto.SigToPub(accounts.TextHash(data), sig)
if err != nil {