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run.py
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run.py
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#!/usr/bin/env python
# The matasano crypto challenges - Set 2 Challenge 13 (http://cryptopals.com/sets/2/challenges/13/)
#
# Copyright (c) 2015 - Albert Puigsech Galicia (albert@puigsech.com)
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
# DEALINGS IN THE SOFTWARE.
import base64
import sys
import random
import re
# Cryptohelper from https://github.com/apuigsech/cryptohelper
from cryptohelper import *
key = ''.join([chr(random.randint(0,255)) for i in range(16)])
def profile_for(email):
if re.match('.[=&].', email):
return None
profile = {
'email': email,
'uid': 10,
'role': 'user'
}
query_str = 'email={0}&uid={1}&role={2}'.format(profile['email'], profile['uid'], profile['role'])
return encrypt_block_ECB(query_str, 16, key, encrypt_block_AES)
def encrypt_data(data):
fake = "A"*10 + data
numblocks = int(math.ceil(float(len(data))/16))
ct = profile_for(fake)
return block_join(block_split(ct,16)[1:numblocks+1])
def tamper_data(ct, fakedata, idx):
if len(fakedata) % 16 != 0:
fakedata = data_pad_PKCS7(fakedata, 16)
fakect = encrypt_data(fakedata)
fakect_blocks = block_split(fakect, 16)
ct_blocks = block_split(ct, 16)
for i in range(idx,idx+len(fakect_blocks)):
ct_blocks[i] = fakect_blocks[i-idx];
return block_join(ct_blocks)
def main(argv):
ct = profile_for("fake@mail.com")
newct = tamper_data(ct, "admin", 2)
print decrypt_block_ECB(newct, 16, key, decrypt_block_AES)
if __name__ == "__main__":
main(sys.argv)