I'm doing AES 256 encrypt/decrypt and I can't figure out why I'm getting this error.
Key : fce4aa4dcf0d2b27fe4ffdafa602c81d1930c410f48ada5c763d4c4052a939eb
IV : c75271d593ca86ca785e3bb25e8d02cb
Traceback (most recent call last): File "C:\Users\xx\Desktop\pycrypto.py", line 25, in <module> print(a.encrypt(codecs.decode("This bloody encryption engine won't work !", 'c75271d593ca86ca785e3bb25e8d02cb', 'hex_codec'))) LookupError: unknown encoding: c75271d593ca86ca785e3bb25e8d02cb import base64 from Crypto.Cipher import AES from Crypto import Random import codecs BS = 16 pad = lambda s: s + (BS - len(s) % BS) * chr(BS - len(s) % BS) unpad = lambda s : s[:-ord(s[len(s)-1:])] class AESCipher: def __init__( self, key ): self.key = key def encrypt( self, raw, iv ): raw = pad(raw) cipher = AES.new( self.key, AES.MODE_CBC, iv ) return base64.b64encode( cipher.encrypt( raw ) ) def decrypt( self, enc, iv ): enc = base64.b64decode(enc) cipher = AES.new(self.key, AES.MODE_CBC, iv ) return unpad(cipher.decrypt( enc )) a = AESCipher(codecs.decode('fce4aa4dcf0d2b27fe4ffdafa602c81d1930c410f48ada5c763d4c4052a939eb', 'hex_codec')) print(a.encrypt(codecs.decode("This bloody encryption engine won't work !", 'c75271d593ca86ca785e3bb25e8d02cb', 'hex_codec'))) b = AESCipher(codecs.decode('fce4aa4dcf0d2b27fe4ffdafa602c81d1930c410f48ada5c763d4c4052a939eb', 'hex_codec')) print(b.decrypt(codecs.decode('44FsQIcqM412+YXZBwwoQSCz2uB9QPQMXJ410Xpw1f/M5RTRS7N6yfziAGq/Fd/E', 'c75271d593ca86ca785e3bb25e8d02cb', 'hex_codec'))) 1 Answer
From the docs, codecs.decode() takes the following arguments:
codecs.decode(obj, encoding='utf-8', errors='strict')
In your case, you're passing c75271d593ca86ca785e3bb25e8d02cb as the encoding, hence the error.
