from AESCipher import AESCipher
def f1(s, aes):
return a.cbc_encrypt("comment1=cooking%20MCs;userdata=" + s + ";comment2=%20like%20a%20pound%20of%20bacon")
a = AESCipher()
prefix_size = 32
block_size = 16
flp1 = "IAAAAAIAAAAAAAAA" #This is our goal first 16 blocks
str1 = "AAAAAAAAAAAAAAAA3admin5true" #This is what we'll pass as the userdata to f1
enc1 = f1(str1, a)
#This string has 2 bits flipped in the specfic positions required to turn the 3 into ; and 5 into =
xor = "\x00" * 32 + "\x08\x00\x00\x00\x00\x00\x08\x00\x00\x00\x00\x00\x00\x00\x00\x00" + "\x00" * (len(enc1) - 48)
#xor them together
enc2 = ''.join(chr(ord(a) ^ ord(b)) for a,b in zip(enc1, xor))
#Great success!
print a.cbc_decrypt(enc2)
from base64 import b64decode
from binascii import hexlify
from AESCipher import AESCipher
a = AESCipher("YELLOW SUBMARINE", 16, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00")
f = open('task10_data.txt', 'rb')
cipher_text = b64decode(f.read())
f.close()
print a.cbc_decrypt(cipher_text)
