[Go语言] go语言实战之实现比特币地址校验步骤

   

• 随机取一个32位随机数作为私钥   
  
• 利用生产的随机数采用椭圆加密算法生成公钥   
  
• 计算公钥的sha256哈希值   
  
• 计算RIPEMD-160哈希值   
  
• 第4步结果加上版本号（比特币为0x00）   
  
• 对第5步结果取两次sha256哈希值   
  
• 取上一步结果的前四个字节   
  
• 将第7步结果加到第步的结果后面作为校验   
  
• 利用base58对第8步结果进行变化得到地址
  

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
}