golang[38]-区块链- 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)
}