def test_break_repeating_key_xor_2():
test = "0b3637272a2b2e63622c2e69692a23693a2a3c6324202d623d63343c2a26226324272765272a282b2f20430a652e2c652a3124333a653e2b2027630c692b20283165286326302e27282f"
ciphertext_bytes = binascii.unhexlify(test)
plaintexts = [
decrypt[2]
for decrypt in set1.break_repeating_key_xor(ciphertext_bytes)
]
assert "Burning 'em, if you ain't quick and nimble\nI go crazy when I hear a cymbal" in plaintexts, \
"Plaintext should be decrypted by break_repeating_key_xor()"
def break_repeating_nonce_ctr(ciphertexts):
""" Decrypt CTR encrypted ciphertexts that were encrypted with a fixed nonce
:param ciphertextx: A list of ciphertexts encrypted with a fixed nonce
:return: A list of decrypted plaintexts
"""
block_size = 16
ciphertext = ''.join(ct[:block_size] for ct in ciphertexts)
guess = list(chunks(break_repeating_key_xor(ciphertext, keysize=block_size), block_size))
block_keystream = string_xor(guess[0], ciphertexts[0])
plaintexts = []
for ct in ciphertexts:
plaintext = ''
for block in chunks(ct, block_size):
plaintext += string_xor(block, block_keystream)
plaintexts.append(plaintext)
return plaintexts
def test_break_repeating_key_xor_1():
pt = b'The libel pleaded that the pew was erected under a faculty in 1725, and was transferred to Haines in 1816.'
key = b'\x30\x30\xff'
test = set1.repeating_key_xor(pt, key)
plaintexts = [decrypt[2] for decrypt in set1.break_repeating_key_xor(test)]
assert pt in plaintexts, "Plaintext should be decrypted by break_repeating_key_xor()"
def test_break_repeating_key_xor(self):
with open('6.txt') as f:
contents = bytes(base64.b64decode(f.read()))
deciphered, key, error = set1.break_repeating_key_xor(contents)
self.assertIn(b"I'm back and I'm ringin' the bell \nA rockin'", deciphered)
def test_break_repeating_key_xor():
""" Set 1, Challenge 6 """
assert (set1.break_repeating_key_xor(open(SCRIPT_DIR + 'test_data/1_6.txt', 'r').read().decode('base64'))[:83]
== "I'm back and I'm ringin' the bell \nA rockin' on the mike while the fly girls yell \n")
def test_break_repeating_key_xor_2():
test = "0b3637272a2b2e63622c2e69692a23693a2a3c6324202d623d63343c2a26226324272765272a282b2f20430a652e2c652a3124333a653e2b2027630c692b20283165286326302e27282f"
ciphertext_bytes = binascii.unhexlify(test)
plaintexts = [decrypt[2] for decrypt in set1.break_repeating_key_xor(ciphertext_bytes)]
assert "Burning 'em, if you ain't quick and nimble\nI go crazy when I hear a cymbal" in plaintexts, \
"Plaintext should be decrypted by break_repeating_key_xor()"
def test_break_repeating_key_xor_1():
pt = b'The libel pleaded that the pew was erected under a faculty in 1725, and was transferred to Haines in 1816.'
key = b'\x30\x30\xff'
test = set1.repeating_key_xor(pt, key)
plaintexts = [decrypt[2] for decrypt in set1.break_repeating_key_xor(test)]
assert pt in plaintexts, "Plaintext should be decrypted by break_repeating_key_xor()"
