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Merge 711c4fcd28 into 38827dd9ca

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Jorge Izquierdo 2016-12-15 22:51:51 +00:00 committed by GitHub
commit b2a28f7de7
1 changed files with 4 additions and 1 deletions
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5
internal/ethapi/api.go
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@ -292,9 +292,12 @@ func (s *PrivateAccountAPI) SendTransaction(ctx context.Context, args SendTxArgs
// safely used to calculate a signature from. The hash is calulcated with:
// keccak256("\x19Ethereum Signed Message:\n"${message length}${message}).
func signHash(message string) []byte {
data := common.FromHex(message)
// Give context to the signed message. This prevents an adversery to sign a tx.
// It has no cryptographic purpose.
data := common.FromHex(message)
if len(data) == 0 {
data = []byte(message)
}
msg := fmt.Sprintf("\x19Ethereum Signed Message:\n%d%s", len(data), data)
// Always hash, this prevents choosen plaintext attacks that can extract key information
return crypto.Keccak256([]byte(msg))