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crypt_for_py3.py
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crypt_for_py3.py
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import hashlib
from Crypto import Random
from Crypto.Cipher import AES
'''
Thanks to
http://stackoverflow.com/questions/12524994/encrypt-decrypt-using-pycrypto-aes-256
'''
class AESCipher:
def __init__(self, key):
self.bs = 32 # Block size
self.key = hashlib.sha256(key.encode()).digest() # 32 bit digest
def encrypt(self, raw):
raw = self._pad(raw)
iv = Random.new().read(AES.block_size)
cipher = AES.new(self.key, AES.MODE_CBC, iv)
return iv + cipher.encrypt(raw)
def decrypt(self, enc):
iv = enc[:AES.block_size]
cipher = AES.new(self.key, AES.MODE_CBC, iv)
return self._unpad(cipher.decrypt(enc[AES.block_size:]))
def _pad(self, s):
return s + (self.bs - len(s) % self.bs) * chr(self.bs - len(s) % self.bs).encode('utf-8')
@staticmethod
def _unpad(s):
return s[:-ord(s[len(s) - 1:])]