Golang. 加密

// AesEncrypt 加密
// @origData 要加密的字符串
func (s *Service) AesEncrypt(encryptStr, key []byte) (string, error) {
   block, err := aes.NewCipher(key)
   if err != nil {
      return "", err
   }
   blockSize := block.BlockSize()
   encryptStr = s.PKCS7Padding(encryptStr, blockSize)
   blockMode := cipher.NewCBCEncrypter(block, key[:blockSize])
   crypted := make([]byte, len(encryptStr))
   blockMode.CryptBlocks(crypted, encryptStr)
   return gconv.String(crypted), nil
   //// 转成字节数组
   //encryptData := []byte(encryptStr)
   //k := []byte(key)
   //
   //// 分组秘钥
   //block, _ := aes.NewCipher(k)
   //// 获取秘钥块的长度
   //blockSize := block.BlockSize()
   //// 补全码
   //encryptData = s.PKCS7Padding(encryptData, blockSize)
   //// 加密模式
   //blockMode := cipher.NewCBCEncrypter(block, k[:blockSize])
   //// 创建数组
   //cryted := make([]byte, len(encryptData))
   //// 加密
   //blockMode.CryptBlocks(cryted, encryptData)
   //
   //return base64.StdEncoding.EncodeToString(cryted)
}

// AesDecrypt 解密
// @cryted 需要解密的数据
func (s *Service) AesDecrypt(cryted string, key string) string {
   // 转成字节数组
   crytedByte, _ := base64.StdEncoding.DecodeString(cryted)
   k := []byte(key)
   // 分组秘钥
   block, _ := aes.NewCipher(k)
   // 获取秘钥块的长度
   blockSize := block.BlockSize()
   // 加密模式
   blockMode := cipher.NewCBCDecrypter(block, k[:blockSize])
   // 创建数组
   orig := make([]byte, len(crytedByte))
   // 解密
   blockMode.CryptBlocks(orig, crytedByte)
   // 去补全码
   orig = s.PKCS7UnPadding(orig)
   return string(orig)
}

func (s *Service) PKCS7Padding(ciphertext []byte, blocksize int) []byte {
   padding := blocksize - len(ciphertext)%blocksize
   padtext := bytes.Repeat([]byte{byte(padding)}, padding)
   return append(ciphertext, padtext...)
}

//去码
func (s *Service) PKCS7UnPadding(origData []byte) []byte {
   length := len(origData)
   unpadding := int(origData[length-1])
   return origData[:(length - unpadding)]
}