github.com/sealerio/sealer@v0.11.1-0.20240507115618-f4f89c5853ae/utils/hash/aes.go (about)

     1  // Copyright © 2021 Alibaba Group Holding Ltd.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package hash
    16  
    17  import (
    18  	"bytes"
    19  	"crypto/aes"
    20  	"crypto/cipher"
    21  	"encoding/base64"
    22  	"fmt"
    23  )
    24  
    25  const aesKey = "ZU9WbzRMVXRQZ2pzTGowR2hNWUpIZjRkWld4aWVRWko="
    26  
    27  func AesEncrypt(origData []byte) (string, error) {
    28  	key, err := base64.StdEncoding.DecodeString(aesKey)
    29  	if err != nil {
    30  		return "", fmt.Errorf("failed to decode key base64: %v", err)
    31  	}
    32  	block, err := aes.NewCipher(key)
    33  	if err != nil {
    34  		return "", err
    35  	}
    36  	blockSize := block.BlockSize()
    37  	origData = pkcs7Padding(origData, blockSize)
    38  	blockMode := cipher.NewCBCEncrypter(block, key[:blockSize])
    39  	ciphertext := make([]byte, len(origData))
    40  	blockMode.CryptBlocks(ciphertext, origData)
    41  	return base64.StdEncoding.EncodeToString(ciphertext), nil
    42  }
    43  
    44  func AesDecrypt(ciphertext []byte) (string, error) {
    45  	key, err := base64.StdEncoding.DecodeString(aesKey)
    46  	if err != nil {
    47  		return "", fmt.Errorf("failed to decode key base64: %v", err)
    48  	}
    49  	ciphertext, err = base64.StdEncoding.DecodeString(string(ciphertext))
    50  	if err != nil {
    51  		return "", fmt.Errorf("failed to decode key base64: %v", err)
    52  	}
    53  	block, err := aes.NewCipher(key)
    54  	if err != nil {
    55  		return "", err
    56  	}
    57  	blockSize := block.BlockSize()
    58  	if len(ciphertext) < blockSize {
    59  		return "", fmt.Errorf("ciphertext short than block size")
    60  	}
    61  
    62  	plaintext := make([]byte, len(ciphertext))
    63  	mode := cipher.NewCBCDecrypter(block, key[:blockSize])
    64  	mode.CryptBlocks(plaintext, ciphertext)
    65  	plaintext = pkcs7UnPadding(plaintext)
    66  	return string(plaintext), nil
    67  }
    68  
    69  func pkcs7Padding(origData []byte, blockSize int) []byte {
    70  	padding := blockSize - len(origData)%blockSize
    71  	padText := bytes.Repeat([]byte{byte(padding)}, padding)
    72  	return append(origData, padText...)
    73  }
    74  
    75  func pkcs7UnPadding(origData []byte) []byte {
    76  	length := len(origData)
    77  	unPadding := int(origData[length-1])
    78  	return origData[:(length - unPadding)]
    79  }