base64加解密

base64base64
package main

import (
    "encoding/base64"
    "fmt"
)

func base64Encode(src []byte) []byte {
    return []byte(base64.StdEncoding.EncodeToString(src))
}

func base64Decode(src []byte) ([]byte, error) {
    return base64.StdEncoding.DecodeString(string(src))
}

func main() {
    // encode
    hello := "你好，世界！ hello world"
    debyte := base64Encode([]byte(hello))
    fmt.Println(debyte)
    // decode
    enbyte, err := base64Decode(debyte)
    if err != nil {
        fmt.Println(err.Error())
    }

    if hello != string(enbyte) {
        fmt.Println("hello is not equal to enbyte")
    }

    fmt.Println(string(enbyte))
}

高级加解密

crypto
crypto/aescrypto/des

因为这两种算法使用方法类似，所以在此，我们仅用aes包为例来讲解它们的使用，请看下面的例子

package main

import (
    "crypto/aes"
    "crypto/cipher"
    "fmt"
    "os"
)

var commonIV = []byte{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f}

func main() {
    //需要去加密的字符串
    plaintext := []byte("My name is Astaxie")
    //如果传入加密串的话，plaint就是传入的字符串
    if len(os.Args) > 1 {
        plaintext = []byte(os.Args[1])
    }

    //aes的加密字符串
    key_text := "astaxie12798akljzmknm.ahkjkljl;k"
    if len(os.Args) > 2 {
        key_text = os.Args[2]
    }

    fmt.Println(len(key_text))

    // 创建加密算法aes
    c, err := aes.NewCipher([]byte(key_text))
    if err != nil {
        fmt.Printf("Error: NewCipher(%d bytes) = %s", len(key_text), err)
        os.Exit(-1)
    }

    //加密字符串
    cfb := cipher.NewCFBEncrypter(c, commonIV)
    ciphertext := make([]byte, len(plaintext))
    cfb.XORKeyStream(ciphertext, plaintext)
    fmt.Printf("%s=>%x\n", plaintext, ciphertext)

    // 解密字符串
    cfbdec := cipher.NewCFBDecrypter(c, commonIV)
    plaintextCopy := make([]byte, len(plaintext))
    cfbdec.XORKeyStream(plaintextCopy, ciphertext)
    fmt.Printf("%x=>%s\n", ciphertext, plaintextCopy)
}

aes.NewCiphercipher.Block
type Block interface {
    // BlockSize returns the cipher's block size.
    BlockSize() int

    // Encrypt encrypts the first block in src into dst.
    // Dst and src may point at the same memory.
    Encrypt(dst, src []byte)

    // Decrypt decrypts the first block in src into dst.
    // Dst and src may point at the same memory.
    Decrypt(dst, src []byte)
}

这三个函数实现了加解密操作，详细的操作请看上面的例子