Created
November 5, 2018 07:35
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package main | |
import ( | |
"bytes" | |
"crypto/ecdsa" | |
"fmt" | |
"log" | |
"github.com/ethereum/go-ethereum/common/hexutil" | |
"github.com/ethereum/go-ethereum/crypto" | |
) | |
func main() { | |
privateKey, err := crypto.HexToECDSA("fad9c8855b740a0b7ed4c221dbad0f33a83a49cad6b3fe8d5817ac83d38b6a19") | |
if err != nil { | |
log.Fatal(err) | |
} | |
publicKey := privateKey.Public() | |
publicKeyECDSA, ok := publicKey.(*ecdsa.PublicKey) | |
if !ok { | |
log.Fatal("error casting public key to ECDSA") | |
} | |
publicKeyBytes := crypto.FromECDSAPub(publicKeyECDSA) | |
data := []byte("hello") | |
hash := crypto.Keccak256Hash(data) | |
fmt.Println(hash.Hex()) // 0x1c8aff950685c2ed4bc3174f3472287b56d9517b9c948127319a09a7a36deac8 | |
signature, err := crypto.Sign(hash.Bytes(), privateKey) | |
if err != nil { | |
log.Fatal(err) | |
} | |
fmt.Println(hexutil.Encode(signature)) // 0x789a80053e4927d0a898db8e065e948f5cf086e32f9ccaa54c1908e22ac430c62621578113ddbb62d509bf6049b8fb544ab06d36f916685a2eb8e57ffadde02301 | |
sigPublicKey, err := crypto.Ecrecover(hash.Bytes(), signature) | |
if err != nil { | |
log.Fatal(err) | |
} | |
matches := bytes.Equal(sigPublicKey, publicKeyBytes) | |
fmt.Println(matches) // true | |
sigPublicKeyECDSA, err := crypto.SigToPub(hash.Bytes(), signature) | |
if err != nil { | |
log.Fatal(err) | |
} | |
sigPublicKeyBytes := crypto.FromECDSAPub(sigPublicKeyECDSA) | |
matches = bytes.Equal(sigPublicKeyBytes, publicKeyBytes) | |
fmt.Println(matches) // true | |
signatureNoRecoverID := signature[:len(signature)-1] // remove recovery id | |
verified := crypto.VerifySignature(publicKeyBytes, hash.Bytes(), signatureNoRecoverID) | |
fmt.Println(verified) // true | |
} |
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