python AES Encrypt

Question

我是python/django的新手。我想使用AES加密。搜索后，我找到了一些这样的库：https：//gist.github.com/jeetsukumaran/1291836但是由于我有IV，我无法使用它们，但这没有静脉代码。我在C＃中有示例代码。有人可以帮助我将此代码转换为Python代码？

using System;
using System.Collections.Generic;
using System.Text;
using System.Security.Cryptography;
using System.IO;
namespace AESUtility {
 public class AES {
  string AES_Key = string.Empty;
  string AES_IV = string.Empty;
  public AES(string AES_Key, string AES_IV) {
   this.AES_Key = AES_Key;
   this.AES_IV = AES_IV;
  }
  public bool Encrypt(String Input, out string encryptedString) {
   try {
    var aes = new RijndaelManaged();
    aes.KeySize = 256;
    aes.BlockSize = 256;
    aes.Padding = PaddingMode.PKCS7;
    aes.Key = Convert.FromBase64String(this.AES_Key);
    aes.IV = Convert.FromBase64String(this.AES_IV);
    var encrypt = aes.CreateEncryptor(aes.Key, aes.IV);
    byte[] xBuff = null;
    using(var ms = new MemoryStream()) {
     using(var cs = new CryptoStream(ms, encrypt, CryptoStreamMode.Write)) {
      byte[] xXml = Encoding.UTF8.GetBytes(Input);
      cs.Write(xXml, 0, xXml.Length);
     }
     xBuff = ms.ToArray();
    }
    encryptedString = Convert.ToBase64String(xBuff);
    return true;
   } catch (Exception ex) {
    encryptedString = string.Empty;
    return false;
   }
  }
  public bool Decrypt(String Input, out string decodedString) {
   try {
    RijndaelManaged aes = new RijndaelManaged();
    aes.KeySize = 256;
    aes.BlockSize = 256;
    aes.Mode = CipherMode.CBC;
    aes.Padding = PaddingMode.PKCS7;
    aes.Key = Convert.FromBase64String(this.AES_Key);
    aes.IV = Convert.FromBase64String(this.AES_IV);
    var decrypt = aes.CreateDecryptor();
    byte[] xBuff = null;
    using(var ms = new MemoryStream()) {
     using(var cs = new CryptoStream(ms, decrypt, CryptoStreamMode.Write)) {
      byte[] xXml = Convert.FromBase64String(Input);
      cs.Write(xXml, 0, xXml.Length);
     }
     xBuff = ms.ToArray();
    }
    decodedString = Encoding.UTF8.GetString(xBuff);
    return true;
   } catch (Exception ex) {
    decodedString = string.Empty;
    return false;
   }
  }
 }
}

Answer 1

编辑2022

pycrypto现在可能是不受欢迎的。最新版本是2013年10月(请参阅https://pypi.org/project/pycrypto/#history(

在现代项目中，使用pycryptodome。官方文档给出了AES加密的示例：https：//www.pycryptodome.org/en/latest/src/src/examples.html#encrypt-data-with-aes-aes

原始答案：

这是使用众所周知的pycrypto库的AES加密的示例：

>>> from Crypto.Cipher import AES
>>> obj = AES.new('This is a key123', AES.MODE_CBC, 'This is an IV456')
>>> message = "The answer is no"
>>> ciphertext = obj.encrypt(message)
>>> ciphertext
'xd6x83x8dd!VTx92xaa`Ax05xe0x9bx8bxf1'
>>> obj2 = AES.new('This is a key123', AES.MODE_CBC, 'This is an IV456')
>>> obj2.decrypt(ciphertext)
'The answer is no'

Answer 2

AES 256在OFB模式下：

from Crypto.Cipher import AES
from Crypto.Random import new as Random
from hashlib import sha256
from base64 import b64encode,b64decode
class AESCipher:
  def __init__(self,data,key):
    self.block_size = 16
    self.data = data
    self.key = sha256(key.encode()).digest()[:32]
    self.pad = lambda s: s + (self.block_size - len(s) % self.block_size) * chr (self.block_size - len(s) % self.block_size)
    self.unpad = lambda s: s[:-ord(s[len(s) - 1:])]
  def encrypt(self):
    plain_text = self.pad(self.data)
    iv = Random().read(AES.block_size)
    cipher = AES.new(self.key,AES.MODE_OFB,iv)
    return b64encode(iv + cipher.encrypt(plain_text.encode())).decode()
  def decrypt(self):
    cipher_text = b64decode(self.data.encode())
    iv = cipher_text[:self.block_size]
    cipher = AES.new(self.key,AES.MODE_OFB,iv)
    return self.unpad(cipher.decrypt(cipher_text[self.block_size:])).decode()

用法：

AESCipher("data to encrypt","key to use").encrypt()

AESCipher("encrypted data","key to use").decrypt()