class TestBlock(unittest.TestCase):
"""
Tests raw AES-128 block operations.
"""
def setUp(self):
self.aes = AES(b'\x00' * 16)
def test_success(self):
""" Should be able to encrypt and decrypt block messages. """
message = b'\x01' * 16
ciphertext = self.aes.encrypt_block(message)
self.assertEqual(self.aes.decrypt_block(ciphertext), message)
message = b'a secret message'
ciphertext = self.aes.encrypt_block(message)
self.assertEqual(self.aes.decrypt_block(ciphertext), message)
def test_bad_key(self):
""" Raw AES requires keys of an exact size. """
with self.assertRaises(AssertionError):
AES(b'short key')
with self.assertRaises(AssertionError):
AES(b'long key' * 10)
def test_expected_value(self):
"""
Tests taken from the NIST document, Appendix B:
http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf
"""
message = b'\x32\x43\xF6\xA8\x88\x5A\x30\x8D\x31\x31\x98\xA2\xE0\x37\x07\x34'
key = b'\x2B\x7E\x15\x16\x28\xAE\xD2\xA6\xAB\xF7\x15\x88\x09\xCF\x4F\x3C'
ciphertext = AES(bytes(key)).encrypt_block(bytes(message))
self.assertEqual(ciphertext, b'\x39\x25\x84\x1D\x02\xDC\x09\xFB\xDC\x11\x85\x97\x19\x6A\x0B\x32')
class TestBlock(unittest.TestCase):
"""
Tests raw AES-128 block operations.
"""
def setUp(self):
self.aes = AES(b'\00' * 16)
def test_success(self):
""" Should be able to encrypt and decrypt block messages. """
message = b'\01' * 16
ciphertext = self.aes.encrypt_block(message)
self.assertEqual(self.aes.decrypt_block(ciphertext), message)
message = b'a secret message'
ciphertext = self.aes.encrypt_block(message)
self.assertEqual(self.aes.decrypt_block(ciphertext), message)
def test_bad_key(self):
""" Raw AES requires keys of an exact size. """
with self.assertRaises(AssertionError):
AES(b'short key')
with self.assertRaises(AssertionError):
AES(b'long key' * 10)
def test_expected_value(self):
"""
Tests taken from the NIST document, Appendix B:
http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf
"""
message = b'\x32\x43\xF6\xA8\x88\x5A\x30\x8D\x31\x31\x98\xA2\xE0\x37\x07\x34'
key = b'\x2B\x7E\x15\x16\x28\xAE\xD2\xA6\xAB\xF7\x15\x88\x09\xCF\x4F\x3C'
ciphertext = AES(bytes(key)).encrypt_block(bytes(message))
self.assertEqual(ciphertext, b'\x39\x25\x84\x1D\x02\xDC\x09\xFB\xDC\x11\x85\x97\x19\x6A\x0B\x32')
def test_expected_values256(self):
message = b'\x00\x11\x22\x33\x44\x55\x66\x77\x88\x99\xAA\xBB\xCC\xDD\xEE\xFF'
aes = AES(b'\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f')
ciphertext = aes.encrypt_block(message)
self.assertEqual(
ciphertext, b'\x8e\xa2\xb7\xca\x51\x67\x45\xbf\xea\xfc\x49\x90\x4b\x49\x60\x89')
self.assertEqual(aes.decrypt_block(ciphertext), message)
def aes_ecb_decrypt(key, ciphertext):
"""
Decrypts a ciphertext that was encrypted with AES in ECB mode.
"""
aes = AES(key)
decrypted_blocks = [aes.decrypt_block(b) for b in divide(ciphertext, AES.BLOCK_SIZE)]
return unpad_pkcs7(b''.join(decrypted_blocks))
def test_expected_values192(self):
message = b'\x00\x11\x22\x33\x44\x55\x66\x77\x88\x99\xAA\xBB\xCC\xDD\xEE\xFF'
aes = AES(
b'\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17')
ciphertext = aes.encrypt_block(message)
self.assertEqual(
ciphertext, b'\xdd\xa9\x7c\xa4\x86\x4c\xdf\xe0\x6e\xaf\x70\xa0\xec\x0d\x71\x91')
self.assertEqual(aes.decrypt_block(ciphertext), message)
def aes_cbc_decrypt(key, ciphertext, iv=None):
"""
Decrypts a ciphertext that was encrypted with AES en CBC mode. If IV is not
given take the first ciphertext block.
"""
aes = AES(key)
encrypted_blocks = divide(ciphertext, AES.BLOCK_SIZE)
if not iv:
iv = encrypted_blocks.pop(0)
decrypted_blocks = []
previous = iv
for block in encrypted_blocks:
data = xor(previous, aes.decrypt_block(block))
previous = block
decrypted_blocks.append(data)
return unpad_pkcs7(b''.join(decrypted_blocks))
def test_256(self):
aes = AES(b'P' * 32)
message = b'M' * 16
ciphertext = aes.encrypt_block(message)
self.assertEqual(aes.decrypt_block(ciphertext), message)
class TestBlock(unittest.TestCase):
"""
Tests raw AES-128 block operations.
"""
def setUp(self):
self.aes = AES(b'\00' * 16)
def test_success(self):
""" Should be able to encrypt and decrypt block messages. """
message = b'\01' * 16
ciphertext = self.aes.encrypt_block(message)
self.assertEqual(self.aes.decrypt_block(ciphertext), message)
message = b'a secret message'
ciphertext = self.aes.encrypt_block(message)
self.assertEqual(self.aes.decrypt_block(ciphertext), message)
def test_bad_key(self):
""" Raw AES requires keys of an exact size. """
with self.assertRaises(AssertionError):
AES(b'short key')
with self.assertRaises(AssertionError):
AES(b'long key' * 10)
def test_expected_value_128(self):
"""
Tests taken from the NIST document, Appendix B:
http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf
"""
message = b'\x32\x43\xF6\xA8\x88\x5A\x30\x8D\x31\x31\x98\xA2\xE0\x37\x07\x34'
key = b'\x2B\x7E\x15\x16\x28\xAE\xD2\xA6\xAB\xF7\x15\x88\x09\xCF\x4F\x3C'
ciphertext = AES(bytes(key)).encrypt_block(bytes(message))
self.assertEqual(ciphertext, b'\x39\x25\x84\x1D\x02\xDC\x09\xFB\xDC\x11\x85\x97\x19\x6A\x0B\x32')
def test_expected_value_printing(self):
#Tests taken from the NIST document, Appendix B:
#http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf
message = b'\x43\x6f\x72\x72\x65\x63\x74\x20\x44\x65\x63\x72\x79\x70\x74\x21'
key = b'\x30\x31\x32\x33\x34\x35\x36\x37\x38\x39\x3A\x3B\x3C\x3D\x3E\x3F'
ciphertext = AES(bytes(key)).encrypt_block_with_printing(bytes(message))
self.assertEqual(ciphertext, b'\xF4\x35\x15\x03\xAA\x78\x1C\x52\x02\x67\xD6\x90\xC4\x2D\x1F\x43')
def test_decrypt_value_printing(self):
#Tests taken from the NIST document, Appendix B:
#http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf
key = b'\x30\x31\x32\x33\x34\x35\x36\x37\x38\x39\x3A\x3B\x3C\x3D\x3E\x3F'
ciphertext = b'\xF4\x35\x15\x03\xAA\x78\x1C\x52\x02\x67\xD6\x90\xC4\x2D\x1F\x43'
message = AES(bytes(key)).decrypt_block_with_printing(bytes(ciphertext))
self.assertEqual(message, b'\x43\x6f\x72\x72\x65\x63\x74\x20\x44\x65\x63\x72\x79\x70\x74\x21')
def test_expected_value2_printing(self):
"""
Tests taken from the NIST document, Appendix B:
http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf
"""
message = b'\x00\x11\x22\x33\x44\x55\x66\x77\x88\x99\xaa\xbb\xcc\xdd\xee\xff'
key = b'\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f'
ciphertext = AES(bytes(key)).encrypt_block(bytes(message))
self.assertEqual(ciphertext, b'\x69\xc4\xe0\xd8\x6a\x7b\x04\x30\xd8\xcd\xb7\x80\x70\xb4\xc5\x5a')
def test_decrypt_value2_printing(self):
"""
Tests taken from the NIST document, Appendix B:
http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf
"""
key = b'\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f'
ciphertext = b'\x69\xc4\xe0\xd8\x6a\x7b\x04\x30\xd8\xcd\xb7\x80\x70\xb4\xc5\x5a'
message = AES(bytes(key)).decrypt_block(bytes(ciphertext))
self.assertEqual(message, b'\x00\x11\x22\x33\x44\x55\x66\x77\x88\x99\xaa\xbb\xcc\xdd\xee\xff')
def test_expected_values256(self):
message = b'\x00\x11\x22\x33\x44\x55\x66\x77\x88\x99\xAA\xBB\xCC\xDD\xEE\xFF'
aes = AES(b'\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f')
ciphertext = aes.encrypt_block(message)
self.assertEqual(ciphertext, b'\x8e\xa2\xb7\xca\x51\x67\x45\xbf\xea\xfc\x49\x90\x4b\x49\x60\x89')
self.assertEqual(aes.decrypt_block(ciphertext), message)
def test_expected_values192(self):
message = b'\x00\x11\x22\x33\x44\x55\x66\x77\x88\x99\xAA\xBB\xCC\xDD\xEE\xFF'
aes = AES(b'\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17')
ciphertext = aes.encrypt_block(message)
self.assertEqual(ciphertext, b'\xdd\xa9\x7c\xa4\x86\x4c\xdf\xe0\x6e\xaf\x70\xa0\xec\x0d\x71\x91')
self.assertEqual(aes.decrypt_block(ciphertext), message)
def test_256(self):
aes = AES(b'P' * 32)
message = b'M' * 16
ciphertext = aes.encrypt_block(message)
self.assertEqual(aes.decrypt_block(ciphertext), message)
