aes.py

#Using the PyCrypto module
import base64
from Crypto.Cipher import AES, DES
import random
import hashlib
 
def pkcs7padding(text):
    bs = AES.block_size
    length = len(text)
    bytes_length = len(bytes(text, encoding='utf-8'))
    padding_size = length if(bytes_length == length) else bytes_length
    padding = bs - padding_size % bs
    padding_text = chr(padding) * padding
    return text + padding_text

def pkcs7unpadding(text):
    length = len(text)
    unpadding = ord(text[length-1])
    return text[0:length-unpadding]
def encrypt(key, iv, content):
    cipher = AES.new(key, AES.MODE_CBC, iv)
    content_padding = pkcs7padding(content)
    encrypt_bytes = cipher.encrypt(bytes(content_padding, encoding='utf-8'))
    result = str(base64.b64encode(encrypt_bytes), encoding='utf-8')
    return result 
def decrypt(key, iv, content):
    cipher = AES.new(key, AES.MODE_CBC, iv)
    encrypt_bytes = base64.b64decode(content)
    decrypt_bytes = cipher.decrypt(encrypt_bytes)
    result = str(decrypt_bytes, encoding='utf8')
    result = pkcs7unpadding(result)
    return result