Created
May 7, 2015 13:28
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Using pycrypto AES
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# Taken from http://stackoverflow.com/questions/12524994/encrypt-decrypt-using-pycrypto-aes-256/12525165#12525165 | |
import base64 | |
import hashlib | |
from Crypto import Random | |
from Crypto.Cipher import AES | |
class AESCipher(object): | |
def __init__(self, key): | |
self.bs = 32 | |
self.key = hashlib.sha256(key.encode()).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 base64.b64encode(iv + cipher.encrypt(raw)) | |
def decrypt(self, enc): | |
enc = base64.b64decode(enc) | |
iv = enc[:AES.block_size] | |
cipher = AES.new(self.key, AES.MODE_CBC, iv) | |
return self._unpad(cipher.decrypt(enc[AES.block_size:])).decode('utf-8') | |
def _pad(self, s): | |
return s + (self.bs - len(s) % self.bs) * chr(self.bs - len(s) % self.bs) | |
@staticmethod | |
def _unpad(s): | |
return s[:-ord(s[len(s)-1:])] |
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