go语言实战之实现比特币地址校验步骤

func (w Wallet) GetAddress() []byte {
    pubKeyHash := HashPubKey(w.PublicKey)

    versionedPayload := append([]byte{version}, pubKeyHash...)
    checksum := checksum(versionedPayload)

    fullPayload := append(versionedPayload, checksum...)
    address := Base58Encode(fullPayload)

    return address
}
func HashPubKey(pubKey []byte) []byte {
    publicSHA256 := sha256.Sum256(pubKey)

    RIPEMD160Hasher := ripemd160.New()
    _, err := RIPEMD160Hasher.Write(publicSHA256[:])
    publicRIPEMD160 := RIPEMD160Hasher.Sum(nil)

    return publicRIPEMD160
}

func checksum(payload []byte) []byte {
    firstSHA := sha256.Sum256(payload)
    secondSHA := sha256.Sum256(firstSHA[:])

    return secondSHA[:addressChecksumLen]
}

addressChecksumLen：=4
func ValidateAddress(address string) bool {
    pubKeyHash := Base58Decode([]byte(address))
    actualChecksum := pubKeyHash[len(pubKeyHash)-addressChecksumLen:]
    version := pubKeyHash[0]
    pubKeyHash = pubKeyHash[1 : len(pubKeyHash)-addressChecksumLen]
    targetChecksum := checksum(append([]byte{version}, pubKeyHash...))
    return bytes.Compare(actualChecksum, targetChecksum) == 0
}

func checksum(payload []byte) []  //利用两次shah256求校验位
 byte {
    firstSHA := sha256.Sum256(payload)
    secondSHA := sha256.Sum256(firstSHA[:])

    return secondSHA[:addressChecksumLen]
}

func Base58Decode(input []byte) []byte {
    result := big.NewInt(0)
    zeroBytes := 0

    for b := range input {
        if b == 0x00 {
            zeroBytes++
        }
    }

    payload := input[zeroBytes:]
    for _, b := range payload {
        charIndex := bytes.IndexByte(b58Alphabet, b)
        result.Mul(result, big.NewInt(58))
        result.Add(result, big.NewInt(int64(charIndex)))
    }

    decoded := result.Bytes()
    decoded = append(bytes.Repeat([]byte{byte(0x00)}, zeroBytes), decoded...)

    return decoded
}