编码

base58(区块链)：去掉6个容易混淆的，去掉0，大写的O、大写的I、小写的L、/、+/、+影响双击选择

实现

var base58 = []byte("123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz")

func ReverseByte(bytes []byte) []byte {
    for i := 0; i < len(bytes)/2; i++ {
        bytes[i], bytes[len(bytes)-1-i] = bytes[len(bytes)-1-i], bytes[i]
    }
    return bytes
}

func Base58Encoding(str string) string {
    bytes := []byte(str)
    l := big.NewInt(0).SetBytes(bytes)
    var mod []byte
    for l.Cmp(big.NewInt(0)) > 0 {
        m := big.NewInt(0)
        ten58 := big.NewInt(58)
        l.DivMod(l, ten58, m)
        mod = append(mod, base58[m.Int64()])
    }

    for _, v := range bytes {
        if v != 0 {
            break
        } else if v == 0 {
            mod = append(mod, byte('1'))
        }
    }
    return string(ReverseByte(mod))
}

func Base58Decoding(str string) string {
    sBytes := []byte(str)
    r := big.NewInt(0)
    for _, v := range sBytes {
        i := bytes.IndexByte(base58, v)
        r.Mul(r, big.NewInt(58))
        r.Add(r, big.NewInt(int64(i)))
    }
    return string(r.Bytes())
}

func main() {
    src := "blog.caixiaoxin.cn"
    res := Base58Encoding(src)
    fmt.Println(res)
    decoding := Base58Decoding(res)
    fmt.Println(decoding)
}