Padra/tls/AES.py

from hashlib import sha256
import base64
from Crypto import Random
from Crypto.Cipher import AES

BS = 16
pad = lambda s: bytes(s + (BS - len(s) % BS) * chr(BS - len(s) % BS), 'utf-8')
unpad = lambda s : s[0:-ord(s[-1:])]

class AESCipher:

    def __init__( self, key ):
        self.key = bytes(key, 'utf-8')

    def encrypt( self, raw ):
        raw = pad(raw)
        iv = Random.new().read( AES.block_size )
        print(iv,raw)
        cipher = AES.new(self.key, AES.MODE_CBC, iv )
        return  (iv + cipher.encrypt( raw )).hex()

    def decrypt( self, enc ):
        enc = bytes.fromhex(enc)
        iv = enc[:16]
        print(iv,enc)

        cipher = AES.new(self.key, AES.MODE_CBC, iv )
        return unpad(cipher.decrypt( enc[16:] )).decode('utf8')

cipher = AESCipher('mysecretpassword')
encrypted = cipher.encrypt('Secret')
decrypted = cipher.decrypt(encrypted)

print(encrypted)
print(decrypted)