python AES Encrypt

Question

I am new in python/django. I want to use AES Encryption. after search I found some libraries like this: https://gist.github.com/jeetsukumaran/1291836 but I could not use them because of I have IV but this dont have IV code. I have sample code in c#. any one may help me to convert this code to python code?

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

EDIT 2022

pycrypto is now probably unmaintained. Latest release was in Oct 2013 (see https://pypi.org/project/pycrypto/#history)

In modern projects, use pycryptodome instead. The official documentation gives example of AES encryption: https://www.pycryptodome.org/en/latest/src/examples.html#encrypt-data-with-aes

Original answer:

Here is an example of AES encryption using well known pycrypto library:

>>> 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
'\xd6\x83\x8dd!VT\x92\xaa`A\x05\xe0\x9b\x8b\xf1'
>>> obj2 = AES.new('This is a key123', AES.MODE_CBC, 'This is an IV456')
>>> obj2.decrypt(ciphertext)
'The answer is no'