image

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pubkeyhash
      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,设主网版本version为[]byte{0x00}
        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)
}