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set4_test.py
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set4_test.py
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import base64
import hashlib
import hmac
import os
import pytest
import set3
import set4
import constants
def test_challenge25():
with open('25.txt') as file:
plaintexts = [base64.b64decode(line.strip().encode())
for line in file]
for plaintext in plaintexts:
ciphertext = set3.aes_ctr(plaintext, constants.key)
assert set4.challenge25(ciphertext) == plaintext
def test_challenge26():
assert set4.challenge26()
def test_challenge27():
assert set4.challenge27() == constants.key
def test_challenge28():
for length in [10, 100, 1000]:
data = os.urandom(length)
expected = hashlib.sha1(constants.key + data).digest()
assert set4.challenge28(data) == expected
def test_challenge29():
message = b"comment1=cooking%20MCs;userdata=foo;comment2=%20like%20a%20pound%20of%20bacon"
extension = b";admin=true"
forged_message, forged_digest = set4.challenge29(message, extension)
digest = hashlib.sha1(constants.key + forged_message).digest()
assert forged_digest == digest
for length in [10, 100, 1000]:
message = os.urandom(length)
forged_message, forged_digest = set4.challenge29(message, extension)
digest = hashlib.sha1(constants.key + forged_message).digest()
assert forged_digest == digest
def test_challenge30():
message = b"comment1=cooking%20MCs;userdata=foo;comment2=%20like%20a%20pound%20of%20bacon"
extension = b";admin=true"
forged_message, forged_digest = set4.challenge30(message, extension)
digest = set4.mac(forged_message, 'md4')
assert forged_digest == digest
for length in [10, 100, 1000]:
message = os.urandom(length)
forged_message, forged_digest = set4.challenge30(message, extension)
digest = set4.mac(forged_message, 'md4')
assert forged_digest == digest
@pytest.mark.skip(reason="test time too long")
def test_challenge31():
for length in [10, 100, 1000]:
message = os.urandom(length)
hashmac = hmac.new(constants.key, message, 'md5').digest()
assert set4.challenge31(message) == hashmac
@pytest.mark.skip(reason="test time too long")
def test_challenge32():
for length in [10, 100, 1000]:
message = os.urandom(length)
hashmac = hmac.new(constants.key, message, 'md5').digest()
assert set4.challenge32(message) == hashmac