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crypto.py
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crypto.py
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from Crypto.Cipher import AES
from Crypto import Random
### https://gist.github.com/crmccreary/5610068
BS = 16
pad = lambda s: s + (BS - len(s) % BS) * chr(BS - len(s) % BS)
unpad = lambda s : s[0:-ord(s[-1])]
class AESCipher:
def __init__( self, key ):
"""
Requires hex encoded param as a key
"""
self.key = key.decode("hex")
def encrypt( self, raw ):
"""
Returns hex encoded encrypted value!
"""
raw = pad(raw)
iv = Random.new().read(AES.block_size);
cipher = AES.new( self.key, AES.MODE_CBC, iv )
return ( iv + cipher.encrypt( raw ) ).encode("hex")
def decrypt( self, enc ):
"""
Requires hex encoded param to decrypt
"""
enc = enc.decode("hex")
iv = enc[:16]
enc= enc[16:]
cipher = AES.new(self.key, AES.MODE_CBC, iv )
return unpad(cipher.decrypt( enc))