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August 19, 2016 00:05
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from base64 import b64decode, b64encode | |
from Crypto.Cipher import AES | |
int_offset = 96 | |
def pad(msg): | |
int_pad = abs((len(msg) % 16) - 16) | |
if int_pad != 16: | |
msg += chr(int_pad + int_offset) * int_pad | |
return msg | |
def unpad(str_msg): | |
chr_last = str_msg[(len(str_msg)-1):len(str_msg)] | |
int_remove = ord(chr_last) - int_offset | |
return str_msg[:(len(str_msg)-int_remove)] | |
def encryptMSG(str_key, str_IV, str_msg): | |
str_pad = pad(str_msg) | |
ea = AES.new(str_key, AES.MODE_CBC, str_IV) | |
ct = ea.encrypt(str_pad) | |
return b64encode(ct) | |
def decryptMSG(str_key, str_IV, byt_msg): | |
str_msg = b64decode(byt_msg) | |
ea = AES.new(str_key, AES.MODE_CBC, str_IV) | |
return unpad(ea.decrypt(str_msg).decode("utf-8")) |
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