Go AES加解密

package aeswrap

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

//@brief:填充明文
func PKCS5Padding(plaintext []byte, blockSize int) []byte{
    padding := blockSize-len(plaintext)%blockSize
    padtext := bytes.Repeat([]byte{byte(padding)},padding)
    return append(plaintext,padtext...)
}

//@brief:去除填充数据
func PKCS5UnPadding(origData []byte) []byte{
    length := len(origData)
    unpadding := int(origData[length-1])
    return origData[:(length - unpadding)]
}

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

	//AES分组长度为128位，所以blockSize=16，单位字节
    blockSize := block.BlockSize()
    origData = PKCS5Padding(origData,blockSize)					
    blockMode := cipher.NewCBCEncrypter(block,key[:blockSize])	//初始向量的长度必须等于块block的长度16字节
    crypted := make([]byte, len(origData))
    blockMode.CryptBlocks(crypted,origData)
    return crypted, nil
}

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

	//AES分组长度为128位，所以blockSize=16，单位字节
    blockSize := block.BlockSize()
    blockMode := cipher.NewCBCDecrypter(block, key[:blockSize])	//初始向量的长度必须等于块block的长度16字节
    origData := make([]byte, len(crypted))
    blockMode.CryptBlocks(origData, crypted)
    origData = PKCS5UnPadding(origData)
    return origData, nil
}

func main(){
	//key的长度必须是16、24或者32字节，分别用于选择AES-128, AES-192, or AES-256
    var aeskey = []byte("12345678abcdefgh")
    pass := []byte("vdncloud123456")
    xpass, err := AesEncrypt(pass,aeskey)
    if err != nil {
        fmt.Println(err)
        return
    }

    pass64 := base64.StdEncoding.EncodeToString(xpass)
    fmt.Printf("加密后:%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("解密后:%s\n", tpass)
}

加密后:Z9Mz4s6LDwYpIam4z+fqxw==
解密后:vdncloud123456