go语言渐入佳境[38]-区块链- 生成比特币地址

生成比特币地址

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package main

import (
"crypto/sha256"
"golang.org/x/crypto/ripemd160"
"fmt"
"math/big"
"encoding/hex"
)


//base58编码
var b58Alphabet = []byte("123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz")

func Base58Encode(input []byte) []byte{
var result []byte

x:= big.NewInt(0).SetBytes(input)

base := big.NewInt(int64(len(b58Alphabet)))
zero := big.NewInt(0)

mod := &big.Int{}
for x.Cmp(zero) != 0 {
x.DivMod(x,base,mod) // 对x取余数
result = append(result, b58Alphabet[mod.Int64()])
}



ReverseBytes(result)

for _,b:=range input{

if b ==0x00{
result = append([]byte{b58Alphabet[0]},result...)
}else{
break
}
}


return result

}


//字节数组的反转
func ReverseBytes(data []byte){
for i,j :=0,len(data) - 1;i<j;i,j = i+1,j - 1{
data[i],data[j] = data[j],data[i]
}
}

//产生比特币地址
func generateAddress(pubkey []byte) []byte{
//1、计算pubkeuhash
pubkeyHash256 :=sha256.Sum256(pubkey)

PIPEMD160Hasher := ripemd160.New()

_,err:= PIPEMD160Hasher.Write(pubkeyHash256[:])

if err!=nil{
fmt.Println("error")
}

publicRIPEMD160 := PIPEMD160Hasher.Sum(nil)

//2、计算checksum
versionPayload := append([]byte{0x00},publicRIPEMD160...)

firstSHA := sha256.Sum256(versionPayload)
secondSHA := sha256.Sum256(firstSHA[:])
//checksum 是前面的4个字节
checksum:=secondSHA[:4]

//3、base58编码
fullPayload := append(versionPayload,checksum...)
//返回地址
address:=Base58Encode(fullPayload)
return address
}

func main(){
//外部得到公钥
publickpey,_:=hex.DecodeString("D4A6C78C0B13DBD8A07AAB17C7D79ED9CB2523B63EDAC4E7CACE93C6B66CEDC7918EE0E174E8B2B61468D0E6CAA099710EF72094ACBD70BDAE3D8E42C617ACC6")
//fmt.Printf("%X",publickpey)
//打印这个地址
address:=generateAddress(publickpey)

fmt.Printf("%s",address)
}

参考资料

Building Blockchain in Go. Part 5: Addresses

比特币公钥转地址工具

地址:比特币维基百科