golang使用aes庫實現加解密

golang實現加密解密的庫很多, 這裏使用的是aes庫+base64庫來實現.
使用時,需要指定一個私鑰,來進行加解密, 這裏指定是:
var aeskey = []byte(“321423u9y8d2fwfl”)

上代碼:

package main

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

func PKCS5Padding(ciphertext []byte, blockSize int) []byte {
    padding := blockSize - len(ciphertext)%blockSize
    padtext := bytes.Repeat([]byte{byte(padding)}, padding)
    return append(ciphertext, padtext...)
}

func PKCS5UnPadding(origData []byte) []byte {
    length := len(origData)
    unpadding := int(origData[length-1])
    return origData[:(length - unpadding)]
}

func AesEncrypt(origData, key []byte) ([]byte, error) {
    block, err := aes.NewCipher(key)
    if err != nil {
        return nil, err
    }

    blockSize := block.BlockSize()
    origData = PKCS5Padding(origData, blockSize)
    blockMode := cipher.NewCBCEncrypter(block, key[:blockSize])
    crypted := make([]byte, len(origData))
    blockMode.CryptBlocks(crypted, origData)
    return crypted, nil
}

func AesDecrypt(crypted, key []byte) ([]byte, error) {
    block, err := aes.NewCipher(key)
    if err != nil {
        return nil, err
    }

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

func main() {
    var aeskey = []byte("321423u9y8d2fwfl")
    pass := []byte("vdncloud123456")
    xpass, err := AesEncrypt(pass, aeskey)
    if err != nil {
        fmt.Println(err)
        return
    }

    pass64 := base64.StdEncoding.EncodeToString(xpass)
    fmt.Printf("加密後:%v\n",pass64)

    bytesPass, err := base64.StdEncoding.DecodeString(pass64)
    if err != nil {
        fmt.Println(err)
        return
    }

    tpass, err := AesDecrypt(bytesPass, aeskey)
    if err != nil {
        fmt.Println(err)
        return
    }
    fmt.Printf("解密後:%s\n", tpass)
}

輸出:

加密後:rLyZug0MCEF2TBcJdhMyjg==
解密後:vdncloud123456

實現還是比較簡單的, 想了解加解密原理的童靴,轉移步:
http://blog.csdn.net/qq_28205153/article/details/55798628