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package main | |
import ( | |
"fmt" | |
"github.com/ethereum/go-ethereum/accounts" | |
"github.com/ethereum/go-ethereum/common/hexutil" | |
"github.com/ethereum/go-ethereum/crypto" | |
) | |
func main() { | |
fmt.Println(verifySig( | |
"0x0EaE3eF6CC7176553E6B45d94e9eFDE2Da7B82a5", | |
"0x34850b7e36e635783df0563c7202c3ac776df59db5015d2b6f0add33955bb5c43ce35efb5ce695a243bc4c5dc4298db40cd765f3ea5612d2d57da1e4933b2f201b", | |
[]byte("Example `personal_sign` message"), | |
)) | |
} | |
func verifySig(from, sigHex string, msg []byte) bool { | |
sig := hexutil.MustDecode(sigHex) | |
msg = accounts.TextHash(msg) | |
if sig[crypto.RecoveryIDOffset] == 27 || sig[crypto.RecoveryIDOffset] == 28 { | |
sig[crypto.RecoveryIDOffset] -= 27 // Transform yellow paper V from 27/28 to 0/1 | |
} | |
recovered, err := crypto.SigToPub(msg, sig) | |
if err != nil { | |
return false | |
} | |
recoveredAddr := crypto.PubkeyToAddress(*recovered) | |
return from == recoveredAddr.Hex() | |
} |
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