def chal_11():
'''An ECB/CBC detection oracle'''
chal = (2, 11)
s = b'yellow submarineyellow submarineyellow submarineyellow submarine'
for i in range(64):
c = encryption_oracle(s)
return ran(chal, True, True)
def chal_9():
"""Implement PKCS#7 padding"""
chal = (2, 9)
b = b'YELLOW SUBMARINE'
exp = b"YELLOW SUBMARINE\x04\x04\x04\x04"
got = pad(b, 20)
return ran(chal, exp, got)
def chal_3():
"""Single-byte XOR cipher"""
chal = (1, 3)
s = b'1b37373331363f78151b7f2b783431333d78397828372d363c78373e783a393b3736'
exp = b'Cooking MC\'s like a pound of bacon'
brute_force = bruteforce_scx(hex_to_byte(s))
rated = rate(brute_force)
got = (top_rated(rated))
return ran(chal, exp, got)
def chal_2():
"""Fixed XOR"""
chal = (1, 2)
s = b'1c0111001f010100061a024b53535009181c'
t = b'686974207468652062756c6c277320657965'
exp = b'746865206b696420646f6e277420706c6179'
b = same_length_xor(hex_to_byte(s), hex_to_byte(t))
got = byte_to_hex(b)
return ran(chal, exp, got)
def chal_1():
"""Convert hex to base64"""
chal = (1, 1)
s = b'49276d206b696c6c696e6720796f757220627261696e206c'
s += b'696b65206120706f69736f6e6f7573206d757368726f6f6d'
exp = b'SSdtIGtpbGxpbmcgeW91ciBicmFpbiBsaWtlIGEgcG9pc29ub3VzIG11c2hyb29t'
b = hex_to_byte(s)
got = byte_to_base64(b)
return ran(chal, exp, got)
def chal_8():
"""Detect AES in ECB mode"""
chal = (1, 8)
got = (False, "")
f = open('8.txt')
for line in f:
b = hex_to_byte(line.strip("\n").encode('ascii'))
if has_repeating_blocks(b):
got = (True, line)
return ran(chal, True, got[0])
def chal_12():
'''Byte-at-a-time ECB decryption (Simple)'''
chal = (2, 12)
f = open('12.exp.txt')
exp = f.read().encode('ascii')
n = twelve.detect_blocksize()
if has_repeating_blocks == False:
raise RuntimeError("ciphertext does not appear to be using ECB mode")
got = twelve.attack_ecb()
return ran(chal, exp, got)
def chal_5():
"""Implement repeating-key XOR"""
chal = (1, 5)
key = b'ICE'
s = b'Burning \'em, if you ain\'t quick and nimble\n'
s += b'I go crazy when I hear a cymbal'
exp = b'0b3637272a2b2e63622c2e69692a23693a2a3c6324202d623d63343c2a'
exp += b'26226324272765272a282b2f20430a652e2c652a3124333a653e2b202'
exp += b'7630c692b20283165286326302e27282f'
got = byte_to_hex(repeating_xor( bytearray(s), bytearray(key)))
return ran(chal, exp, got)
def chal_4():
"""Detect single-character XOR"""
chal = (1, 4)
filename = '4.txt'
exp = b'Now that the party is jumping\n'
rated = []
for line in open( filename ):
b = hex_to_byte( line.strip("\n" ))
rated.extend( rate( bruteforce_scx( b )))
got = top_rated( rated )
return ran(chal, exp, got)
def chal_7():
"""AES in ECB mode"""
chal = (1, 7)
key = b'YELLOW SUBMARINE'
f = open('7.exp.txt')
exp = f.read()
exp = exp[0:len(exp)-1]
exp = exp.encode('ascii')
f = open('7.txt')
c = f.read()
got = decrypt_ecb(base64.b64decode(c), key)
return ran(chal, exp, got)
def chal_6():
chal = (1, 6)
f = open('6.exp.txt')
exp = f.read().strip("\n")
f = open('6.txt')
b = base64_to_byte( f.read().encode('ascii') )
# keysize = keysize_friedman_method(b)
keysize = 29 # from above
# key = crack_key(b, keysize)
key = b'Terminator X: Bring the noise' # from above
got = repeating_xor(b, key).decode('ascii')
return ran(chal, exp, got)
def chal_10():
'''Implement CBC mode'''
chal = (2, 10)
f = open('10.txt')
ciphertext = base64.b64decode(f.read())
key = b'YELLOW SUBMARINE'
iv = chr(0x00) * 16
iv = iv.encode('ascii')
assert (len(iv) == 16)
assert (len(key) == 16)
got = decrypt_cbc(ciphertext, iv, key)
f = open('10.exp.txt')
exp = bytearray(f.read().encode('latin-1'))
return ran(chal, exp, unpad(got))
def chal_16():
chal = (2, 16)
return ran(chal, True, sixteen.attack_cbc())
def chal_15():
'''completed in block.py'''
chal = (2, 15)
return ran(chal, 1, 1)
def chal_13():
'''ECB cut-and-paste'''
chal = (2, 13)
exp = b'admin'
role = thirteen.attack_ecb()
return ran(chal, exp, role)