Simple Python example of AES in ECB mode. #python #cryptography #aes #ecb #poc

aes-ecb.py

from hashlib import md5
from base64 import b64decode
from base64 import b64encode
from Crypto.Cipher import AES


# Padding for the input string --not
# related to encryption itself.
BLOCK_SIZE = 16  # Bytes
pad = lambda s: s + (BLOCK_SIZE - len(s) % BLOCK_SIZE) * \
                chr(BLOCK_SIZE - len(s) % BLOCK_SIZE)
unpad = lambda s: s[:-ord(s[len(s) - 1:])]


class AESCipher:
    """
    Usage:
        c = AESCipher('password').encrypt('message')
        m = AESCipher('password').decrypt(c)

    Tested under Python 3 and PyCrypto 2.6.1.

    """

    def __init__(self, key):
        self.key = md5(key.encode('utf8')).hexdigest()

    def encrypt(self, raw):
        raw = pad(raw)
        cipher = AES.new(self.key, AES.MODE_ECB)
        return b64encode(cipher.encrypt(raw))

    def decrypt(self, enc):
        enc = b64decode(enc)
        cipher = AES.new(self.key, AES.MODE_ECB)
        return unpad(cipher.decrypt(enc)).decode('utf8')


##
# MAIN
# Just a test.
msg = input('Message...: ')
pwd = input('Password..: ')

print('Ciphertext:', AESCipher(pwd).encrypt(msg))

The Class and functions are good, but you may want to beef up the test to:

msg = raw_input('Message...: ')
pwd = raw_input('Password..: ')
cipher_text = AESCipher(pwd).encrypt(msg)
print('Ciphertext:', cipher_text)
clear_text= AESCipher(pwd).decrypt(cipher_text)
print('Cleartext:', clear_text)