golang使用aes库实现加解密

golang实现加密解密的库很多, 这里使用的是aes库+base64库来实现.
使用时,需要指定一个私钥,来进行加解密.

上代码:

package main

import (
    "bytes"
    "crypto/aes"
    "crypto/cipher"
    "encoding/base64"
    "fmt"
)

type AesCrypt struct {
    Key   []byte
    Text  []byte
    crypt string
}

func (t *AesCrypt) PKCS5Padding(cipherText []byte, blockSize int) []byte {
    padding := blockSize - len(cipherText)%blockSize
    padText := bytes.Repeat([]byte{byte(padding)}, padding)
    return append(cipherText, padText...)
}

func (t *AesCrypt) PKCS5UnPadding(data []byte) []byte {
    length := len(data)
    unPadding := int(data[length-1])
    return data[:(length - unPadding)]
}

func (t *AesCrypt) encrypt() (string, error) {
    block, err := aes.NewCipher(t.Key)
    if err != nil {
        return "", err
    }

    blockSize := block.BlockSize()
    t.Text = t.PKCS5Padding(t.Text, blockSize)

    blockMode := cipher.NewCBCEncrypter(block, t.Key[:blockSize])
    data := make([]byte, len(t.Text))
    blockMode.CryptBlocks(data, t.Text)

    return base64.StdEncoding.EncodeToString(data), nil
}

func (t *AesCrypt) decrypt() ([]byte, error) {
    crypted, err := base64.StdEncoding.DecodeString(t.crypt)
    if err != nil {
        return nil, err
    }

    block, err := aes.NewCipher(t.Key)
    if err != nil {
        return nil, err
    }

    blockSize := block.BlockSize()
    blockMode := cipher.NewCBCDecrypter(block, t.Key[:blockSize])
    data := make([]byte, len(crypted))
    blockMode.CryptBlocks(data, crypted)
    data = t.PKCS5UnPadding(data)
    return data, nil
}

func main() {

    key := []byte("12345678123456cc") //私钥
    word := []byte("this is test!")   //要加密的字符串

    var aesCrypt AesCrypt
    //设置key
    aesCrypt.Key = key

    //加密
    aesCrypt.Text = word
    crypt, err := aesCrypt.encrypt()
    if err != nil {
        fmt.Println(err)
        return
    }
    fmt.Printf("加密后:%vn", crypt)

    //解密
    aesCrypt.crypt = crypt
    word, err = aesCrypt.decrypt()
    if err != nil {
        fmt.Println(err)
        return
    }
    fmt.Printf("解密后:%sn", word)
}

输出:

加密后:6/soAEkh3oVaIZkABcwjJQ==
解密后:this is test!