kopia lustrzana https://github.com/micropython/micropython-lib
Merge a973883985 into 45ead11f96
Marceau Fillon
GitHub
commit
951ff7a5a9
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uaesmac is a module containing an aes cypher and aes-cmac hash algorithm,
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it was adapted to Micropython based on the work from https://github.com/secworks/aes/blob/master/src/model/python/aes.py
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and https://github.com/secworks/cmac/blob/master/src/model/python/cmac.py .
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It was adapted to match the same functions as other hashers, with "update"
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and "digest" methods.
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Keys and messages to test the digest, cipher and decipher methods were taken
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from https://csrc.nist.gov/CSRC/media/Projects/Cryptographic-Standards-and-Guidelines/documents/examples/AES_Core128.pdf ,
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https://csrc.nist.gov/CSRC/media/Projects/Cryptographic-Standards-and-Guidelines/documents/examples/AES_Core256.pdf and
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https://csrc.nist.gov/CSRC/media/Projects/Cryptographic-Standards-and-Guidelines/documents/examples/AES_CMAC.pdf .
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srctype = micropython-lib
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type = module
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version = 0.0
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author = Marceau Fillon
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desc = Module containing an aes cypher and aes-cmac hash algorithm.
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long_desc = README
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import unittest
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from uaes import AesCypher
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nist_aes128_key = (0x2b7e1516, 0x28aed2a6, 0xabf71588, 0x09cf4f3c)
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nist_aes256_key = (0x603deb10, 0x15ca71be, 0x2b73aef0, 0x857d7781,
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0x1f352c07, 0x3b6108d7, 0x2d9810a3, 0x0914dff4)
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class TestAes(unittest.TestCase):
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def setUp(self):
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self.cypher = AesCypher(verbose=False, dump_vars=False)
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class TestAesMixColumns():
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def test_mixcolumns(self):
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print("Test of _mixcolumns and inverse _mixcolumns:")
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mixresult = self._mixcolumns(nist_aes128_key)
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inv_mixresult = self._inv__mixcolumns(mixresult)
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print("Test of _mixw ochi _inv__mixw:")
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testw = 0xdb135345
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expw = 0x8e4da1bc
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mixresult = self._mixw(testw)
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inv_mixresult = self._inv__mixw(mixresult)
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print("Testword: 0x%08x" % testw)
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print("expexted: 0x%08x" % expw)
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print("_mixword: 0x%08x" % mixresult)
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print("inv_mixword: 0x%08x" % inv_mixresult)
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class TestAesCypher128Bits(TestAes):
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"""
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Plain text and expected values come from: https://csrc.nist.gov/CSRC/media/Projects/Cryptographic-Standards-and-Guidelines/documents/examples/AES_Core128.pdf
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"""
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def _test_aes_cypher_128_bits(self, plain_text, expected):
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result = self.cypher.aes_encipher_block(nist_aes128_key, plain_text)
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self.assertEqual(result, expected)
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def test_aes_1(self):
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plain_text = (0x6bc1bee2, 0x2e409f96, 0xe93d7e11, 0x7393172a)
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expected = (0x3ad77bb4, 0x0d7a3660, 0xa89ecaf3, 0x2466ef97)
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self._test_aes_cypher_128_bits(plain_text, expected)
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def test_aes_2(self):
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plain_text = (0xae2d8a57, 0x1e03ac9c, 0x9eb76fac, 0x45af8e51)
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expected = (0xf5d3d585, 0x03b9699d, 0xe785895a, 0x96fdbaaf)
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self._test_aes_cypher_128_bits(plain_text, expected)
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def test_aes_3(self):
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plain_text = (0x30c81c46, 0xa35ce411, 0xe5fbc119, 0x1a0a52ef)
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expected = (0x43b1cd7f, 0x598ece23, 0x881b00e3, 0xed030688)
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self._test_aes_cypher_128_bits(plain_text, expected)
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def test_aes_4(self):
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plain_text = (0xf69f2445, 0xdf4f9b17, 0xad2b417b, 0xe66c3710)
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expected = (0x7b0c785e, 0x27e8ad3f, 0x82232071, 0x04725dd4)
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self._test_aes_cypher_128_bits(plain_text, expected)
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class TestAesCypher256Bits(TestAes):
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"""
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Plain text and expected values come from: https://csrc.nist.gov/CSRC/media/Projects/Cryptographic-Standards-and-Guidelines/documents/examples/AES_Core256.pdf
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"""
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def _test_aes_cypher_256_bits(self, plain_text, expected):
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result = self.cypher.aes_encipher_block(nist_aes256_key, plain_text)
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self.assertEqual(result, expected)
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def test_aes_1(self):
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plain_text = (0x6bc1bee2, 0x2e409f96, 0xe93d7e11, 0x7393172a)
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expected = (0xf3eed1bd, 0xb5d2a03c, 0x064b5a7e, 0x3db181f8)
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self._test_aes_cypher_256_bits(plain_text, expected)
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def test_aes_2(self):
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plain_text = (0xae2d8a57, 0x1e03ac9c, 0x9eb76fac, 0x45af8e51)
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expected = (0x591ccb10, 0xd410ed26, 0xdc5ba74a, 0x31362870)
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self._test_aes_cypher_256_bits(plain_text, expected)
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def test_aes_3(self):
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plain_text = (0x30c81c46, 0xa35ce411, 0xe5fbc119, 0x1a0a52ef)
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expected = (0xb6ed21b9, 0x9ca6f4f9, 0xf153e7b1, 0xbeafed1d)
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self._test_aes_cypher_256_bits(plain_text, expected)
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def test_aes_4(self):
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plain_text = (0xf69f2445, 0xdf4f9b17, 0xad2b417b, 0xe66c3710)
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expected = (0x23304b7a, 0x39f9f3ff, 0x067d8d8f, 0x9e24ecc7)
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self._test_aes_cypher_256_bits(plain_text, expected)
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class TestAesDecypher128Bits(TestAes):
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"""
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Plain text and expected values come from: https://csrc.nist.gov/CSRC/media/Projects/Cryptographic-Standards-and-Guidelines/documents/examples/AES_Core128.pdf
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"""
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def _test_aes_decypher_128_bits(self, cipher_text, expected):
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result = self.cypher.aes_decipher_block(nist_aes128_key, cipher_text)
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self.assertEqual(result, expected)
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def test_aes_1(self):
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plain_text = (0x6bc1bee2, 0x2e409f96, 0xe93d7e11, 0x7393172a)
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cipher_text = (0x3ad77bb4, 0x0d7a3660, 0xa89ecaf3, 0x2466ef97)
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self._test_aes_decypher_128_bits(cipher_text, plain_text)
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def test_aes_2(self):
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plain_text = (0xae2d8a57, 0x1e03ac9c, 0x9eb76fac, 0x45af8e51)
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cipher_text = (0xf5d3d585, 0x03b9699d, 0xe785895a, 0x96fdbaaf)
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self._test_aes_decypher_128_bits(cipher_text, plain_text)
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def test_aes_3(self):
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plain_text = (0x30c81c46, 0xa35ce411, 0xe5fbc119, 0x1a0a52ef)
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cipher_text = (0x43b1cd7f, 0x598ece23, 0x881b00e3, 0xed030688)
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self._test_aes_decypher_128_bits(cipher_text, plain_text)
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def test_aes_4(self):
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plain_text = (0xf69f2445, 0xdf4f9b17, 0xad2b417b, 0xe66c3710)
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cipher_text = (0x7b0c785e, 0x27e8ad3f, 0x82232071, 0x04725dd4)
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self._test_aes_decypher_128_bits(cipher_text, plain_text)
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class TestAesDecypher256Bits(TestAes):
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"""
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Plain text and expected values come from: https://csrc.nist.gov/CSRC/media/Projects/Cryptographic-Standards-and-Guidelines/documents/examples/AES_Core256.pdf
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"""
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def _test_aes_decypher_256_bits(self, cipher_text, expected):
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result = self.cypher.aes_decipher_block(nist_aes256_key, cipher_text)
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self.assertEqual(result, expected)
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def test_aes_1(self):
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plain_text = (0x6bc1bee2, 0x2e409f96, 0xe93d7e11, 0x7393172a)
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cipher_text = (0xf3eed1bd, 0xb5d2a03c, 0x064b5a7e, 0x3db181f8)
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self._test_aes_decypher_256_bits(cipher_text, plain_text)
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def test_aes_2(self):
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plain_text = (0xae2d8a57, 0x1e03ac9c, 0x9eb76fac, 0x45af8e51)
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cipher_text = (0x591ccb10, 0xd410ed26, 0xdc5ba74a, 0x31362870)
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self._test_aes_decypher_256_bits(cipher_text, plain_text)
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def test_aes_3(self):
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plain_text = (0x30c81c46, 0xa35ce411, 0xe5fbc119, 0x1a0a52ef)
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cipher_text = (0xb6ed21b9, 0x9ca6f4f9, 0xf153e7b1, 0xbeafed1d)
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self._test_aes_decypher_256_bits(cipher_text, plain_text)
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def test_aes_4(self):
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plain_text = (0xf69f2445, 0xdf4f9b17, 0xad2b417b, 0xe66c3710)
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cipher_text = (0x23304b7a, 0x39f9f3ff, 0x067d8d8f, 0x9e24ecc7)
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self._test_aes_decypher_256_bits(cipher_text, plain_text)
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if __name__ == "__main__":
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unittest.main()
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import unittest
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from ucmac import CmacHasher
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import struct
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test_sub_block_bytes = b'12345678'
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test_sub_block_int = 305419896
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test_block = (test_sub_block_int, test_sub_block_int, test_sub_block_int, test_sub_block_int)
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class TestCmac(unittest.TestCase):
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def setUp(self):
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self.hasher = CmacHasher()
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class TestCmacUpdate(TestCmac):
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def test_update_empty_message(self):
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self.hasher.update(b'12345')
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self.assertEqual(b'12345', self.hasher.current_block)
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self.assertEqual(self.hasher.message, [])
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def test_update_message_enough_space(self):
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self.hasher.current_block = b'12345'
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self.hasher.update(b'678')
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self.assertEqual(test_sub_block_bytes, self.hasher.current_block)
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self.assertEqual(self.hasher.message, [])
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def test_update_message_exact_space(self):
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self.hasher.current_block = test_sub_block_bytes + test_sub_block_bytes
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self.hasher.update(test_sub_block_bytes + test_sub_block_bytes)
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self.assertEqual(b'', self.hasher.current_block)
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self.assertEqual(self.hasher.message, [(test_sub_block_int,
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test_sub_block_int,
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test_sub_block_int,
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test_sub_block_int
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)])
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def test_update_message_extra_bytes(self):
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self.hasher.current_block = b'12345678123456781234567812'
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self.hasher.update(b'34567812345')
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self.assertEqual(b'12345', self.hasher.current_block)
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self.assertEqual(self.hasher.message, [test_block])
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def test_update_message_extra_block(self):
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self.hasher.current_block = b'12345678123456781234567812'
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self.hasher.update(b'3456781234567812345678123456781234567812345')
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self.assertEqual(self.hasher.current_block, b'12345')
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self.assertEqual(len(self.hasher.message), 2)
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self.assertEqual(self.hasher.message, [test_block,
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test_block])
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class TestCmacXor(TestCmac):
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def test_xor(self):
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a = (0x00000000, 0x55555555, 0xaaaaaaaa, 0xff00ff00)
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b = (0xdeadbeef, 0xaa00aa00, 0x55555555, 0xffffffff)
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c = self.hasher.xor_words(a , b)
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self.assertEqual((0xdeadbeef, 0xff55ff55, 0xffffffff, 0x00ff00ff), c)
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class TestCmacSubkeyGenerator(TestCmac):
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def test_cmac_subkey_gen(self):
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"""
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Test the subkey functionality by itself. Testvectors are
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from the first examples in NISTs test case suite.
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"""
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nist_key128 = (0x2b7e1516, 0x28aed2a6, 0xabf71588, 0x09cf4f3c)
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nist_exp_k1 = (0xfbeed618, 0x35713366, 0x7c85e08f, 0x7236a8de)
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nist_exp_k2 = (0xf7ddac30, 0x6ae266cc, 0xf90bc11e, 0xe46d513b)
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(K1, K2) = self.hasher.cmac_gen_subkeys(nist_key128)
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self.assertEqual(K1, nist_exp_k1)
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self.assertEqual(K2, nist_exp_k2)
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class TestCmacDigest(unittest.TestCase):
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def setUp(self):
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key = (0x2b7e1516, 0x28aed2a6, 0xabf71588, 0x09cf4f3c)
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self.hasher = CmacHasher(key)
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def test_zero_length_message(self):
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expected = (0xbb1d6929, 0xe9593728, 0x7fa37d12, 0x9b756746)
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digest = struct.unpack('<IIII', self.hasher.digest())
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self.assertEqual(digest, expected)
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def test_message_1_block(self):
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expected = (0x070a16b4, 0x6b4d4144, 0xf79bdd9d, 0xd04a287c)
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self.hasher.message = [(0x6bc1bee2, 0x2e409f96, 0xe93d7e11, 0x7393172a)]
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digest = struct.unpack('<IIII', self.hasher.digest())
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self.assertEqual(digest, expected)
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def test_message_one_and_quart_blocks(self):
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expected = (0x7d85449e, 0xa6ea19c8, 0x23a7bf78, 0x837dfade)
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self.hasher.message = [(0x6bc1bee2, 0x2e409f96, 0xe93d7e11, 0x7393172a)]
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self.hasher.current_block = b"ae2d8a57"
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digest = struct.unpack('<IIII', self.hasher.digest())
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self.assertEqual(digest, expected)
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def test_message_incomplete_last_block(self):
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expected = (0x72675e5d, 0x1289f7f3, 0x96166b1d, 0xd5e38149)
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self.hasher.message = [(0x6bc1bee2, 0x2e409f96, 0xe93d7e11, 0x7393172a)]
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self.hasher.current_block = b"ae2d8a"
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digest = struct.unpack('<IIII', self.hasher.digest())
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self.assertEqual(digest, expected)
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def test_message_four_blocks(self):
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print("128 bit key, four block message.")
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expected = (0x51f0bebf, 0x7e3b9d92, 0xfc497417, 0x79363cfe)
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self.hasher.message = [(0x6bc1bee2, 0x2e409f96, 0xe93d7e11, 0x7393172a),
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(0xae2d8a57, 0x1e03ac9c, 0x9eb76fac, 0x45af8e51),
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(0x30c81c46, 0xa35ce411, 0xe5fbc119, 0x1a0a52ef),
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(0xf69f2445, 0xdf4f9b17, 0xad2b417b, 0xe66c3710)]
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digest = struct.unpack('<IIII', self.hasher.digest())
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self.assertEqual(digest, expected)
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class TestCmacDigestKey256Bits(unittest.TestCase):
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def setUp(self):
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nist_key256 = (0x603deb10, 0x15ca71be, 0x2b73aef0, 0x857d7781,
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0x1f352c07, 0x3b6108d7, 0x2d9810a3, 0x0914dff4)
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self.hasher = CmacHasher(key=nist_key256)
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def test_digest_zero_length_message(self):
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expected = (0x028962f6, 0x1b7bf89e, 0xfc6b551f, 0x4667d983)
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self.hasher.message = []
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digest = struct.unpack('<IIII', self.hasher.digest())
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self.assertEqual(digest, expected)
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def test_digest_four_blocks_message(self):
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expected = (0xe1992190, 0x549f6ed5, 0x696a2c05, 0x6c315410)
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self.hasher.message = [(0x6bc1bee2, 0x2e409f96, 0xe93d7e11, 0x7393172a),
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(0xae2d8a57, 0x1e03ac9c, 0x9eb76fac, 0x45af8e51),
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(0x30c81c46, 0xa35ce411, 0xe5fbc119, 0x1a0a52ef),
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(0xf69f2445, 0xdf4f9b17, 0xad2b417b, 0xe66c3710)]
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digest = struct.unpack('<IIII', self.hasher.digest())
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self.assertEqual(digest, expected)
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class TestCmacPadding(TestCmac):
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def test_padding_empty_block(self):
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padded_block = self.hasher.pad_block(b'')
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self.assertEqual(padded_block, (0x80000000, 0x00000000, 0x00000000, 0x00000000))
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def test_padding_first_block_complete(self):
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padded_block = self.hasher.pad_block(b'12345678')
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self.assertEqual(padded_block, (0x12345678, 0x80000000, 0x00000000, 0x00000000))
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def test_padding_first_block_incomplete(self):
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padded_block = self.hasher.pad_block(b'1234567')
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self.assertEqual(padded_block, (0x12345678, 0x00000000, 0x00000000, 0x00000000))
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def test_padding_all_blocks_complete(self):
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padded_block = self.hasher.pad_block(b'12345678123456781234567812345678')
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self.assertEqual(padded_block, (0x12345678, 0x12345678, 0x12345678, 0x12345678))
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if __name__ == "__main__":
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unittest.main()
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@ -0,0 +1,702 @@
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#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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#=======================================================================
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# Author: Joachim Strömbergson
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# Copyright (c) 2014, Secworks Sweden AB
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||||
# All rights reserved.
|
||||
#
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||||
# Redistribution and use in source and binary forms, with or
|
||||
# without modification, are permitted provided that the following
|
||||
# conditions are met:
|
||||
#
|
||||
# 1. Redistributions of source code must retain the above copyright
|
||||
# notice, this list of conditions and the following disclaimer.
|
||||
#
|
||||
# 2. Redistributions in binary form must reproduce the above copyright
|
||||
# notice, this list of conditions and the following disclaimer in
|
||||
# the documentation and/or other materials provided with the
|
||||
# distribution.
|
||||
#
|
||||
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
||||
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
||||
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
||||
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
||||
# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||||
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
|
||||
# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
#
|
||||
#=======================================================================
|
||||
|
||||
AES_128_ROUNDS = 10
|
||||
AES_256_ROUNDS = 14
|
||||
|
||||
|
||||
class AesCypher():
|
||||
sbox = [0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5,
|
||||
0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
|
||||
0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0,
|
||||
0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
|
||||
0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc,
|
||||
0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
|
||||
0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a,
|
||||
0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
|
||||
0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0,
|
||||
0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
|
||||
0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b,
|
||||
0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
|
||||
0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85,
|
||||
0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
|
||||
0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5,
|
||||
0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
|
||||
0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17,
|
||||
0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
|
||||
0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88,
|
||||
0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
|
||||
0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c,
|
||||
0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
|
||||
0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9,
|
||||
0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
|
||||
0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6,
|
||||
0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
|
||||
0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e,
|
||||
0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
|
||||
0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94,
|
||||
0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
|
||||
0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68,
|
||||
0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16]
|
||||
|
||||
inv_sbox = [0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38,
|
||||
0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb,
|
||||
0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87,
|
||||
0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb,
|
||||
0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d,
|
||||
0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e,
|
||||
0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2,
|
||||
0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25,
|
||||
0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16,
|
||||
0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92,
|
||||
0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda,
|
||||
0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84,
|
||||
0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a,
|
||||
0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06,
|
||||
0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02,
|
||||
0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b,
|
||||
0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea,
|
||||
0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73,
|
||||
0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85,
|
||||
0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e,
|
||||
0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89,
|
||||
0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b,
|
||||
0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20,
|
||||
0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4,
|
||||
0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31,
|
||||
0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f,
|
||||
0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d,
|
||||
0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef,
|
||||
0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0,
|
||||
0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61,
|
||||
0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26,
|
||||
0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d]
|
||||
|
||||
|
||||
def __init__(self, verbose = True, dump_vars = True):
|
||||
self.verbose = verbose
|
||||
self.dump_vars = dump_vars
|
||||
|
||||
def check_block(self, expected, result):
|
||||
"""
|
||||
Checks and reports if a result block matches expected block.
|
||||
|
||||
Parameters
|
||||
----------
|
||||
expected : tuple(int, int, int, int)
|
||||
Expected block
|
||||
result : tuple(int, int, int, int)
|
||||
Block to compare with expected result
|
||||
|
||||
Returns
|
||||
-------
|
||||
int
|
||||
0 if block matches the expected block
|
||||
1 otherwise
|
||||
"""
|
||||
if (expected[0] == result[0]) and (expected[1] == result[1]) and\
|
||||
(expected[2] == result[2]) and (expected[3] == result[3]):
|
||||
if self.verbose:
|
||||
print("OK. Result matches expected.")
|
||||
print("")
|
||||
return 0
|
||||
|
||||
else:
|
||||
print("ERROR. Result does not match expected.")
|
||||
print("Expected:")
|
||||
self._print_block(expected)
|
||||
print("Got:")
|
||||
self._print_block(result)
|
||||
print("")
|
||||
return 1
|
||||
|
||||
def aes_encipher_block(self, key, block):
|
||||
"""
|
||||
Perform AES encipher operation for the given block using the
|
||||
given key length.
|
||||
|
||||
Parameters
|
||||
----------
|
||||
key : tuple
|
||||
128 or 256 bits key split in 32 bits words
|
||||
block : tuple(int, int, int, int)
|
||||
128 bits block split in 32 bits words
|
||||
|
||||
Returns
|
||||
-------
|
||||
tuple(int, int, int, int)
|
||||
128 bits block, result from the encipher operation
|
||||
"""
|
||||
|
||||
# Get round keys based on the given key.
|
||||
if len(key) == 4:
|
||||
round_keys = self._key_gen128(key)
|
||||
num_rounds = AES_128_ROUNDS
|
||||
else:
|
||||
round_keys = self._key_gen256(key)
|
||||
num_rounds = AES_256_ROUNDS
|
||||
|
||||
# Init round
|
||||
if self.verbose:
|
||||
print(" Initial AddRoundKeys round.")
|
||||
tmp_block4 = self._addroundkey(round_keys[0], block)
|
||||
|
||||
# Main rounds
|
||||
for i in range(1 , (num_rounds)):
|
||||
if self.verbose:
|
||||
print("")
|
||||
print(" Round %02d" % i)
|
||||
print(" ---------")
|
||||
|
||||
tmp_block1 = self._subbytes(tmp_block4)
|
||||
tmp_block2 = self._shiftrows(tmp_block1)
|
||||
tmp_block3 = self._mixcolumns(tmp_block2)
|
||||
tmp_block4 = self._addroundkey(round_keys[i], tmp_block3)
|
||||
|
||||
|
||||
# Final round
|
||||
if self.verbose:
|
||||
print(" Final round.")
|
||||
tmp_block1 = self._subbytes(tmp_block4)
|
||||
tmp_block2 = self._shiftrows(tmp_block1)
|
||||
tmp_block3 = self._addroundkey(round_keys[num_rounds], tmp_block2)
|
||||
|
||||
return tmp_block3
|
||||
|
||||
def aes_decipher_block(self, key, block):
|
||||
"""
|
||||
Perform AES decipher operation for the given block
|
||||
using the given key length.
|
||||
|
||||
Parameters
|
||||
----------
|
||||
key : tuple
|
||||
128 or 256 bits key split in 32 bits words
|
||||
block : tuple(int, int, int, int)
|
||||
128 bits block split in 32 bits words
|
||||
|
||||
Returns
|
||||
-------
|
||||
tuple(int, int, int, int)
|
||||
128 bits block, result from the decipher operation
|
||||
"""
|
||||
tmp_block = block[:]
|
||||
|
||||
# Get round keys based on the given key.
|
||||
if len(key) == 4:
|
||||
round_keys = self._key_gen128(key)
|
||||
num_rounds = AES_128_ROUNDS
|
||||
else:
|
||||
round_keys = self._key_gen256(key)
|
||||
num_rounds = AES_256_ROUNDS
|
||||
|
||||
# Initial round
|
||||
if self.verbose:
|
||||
print(" Initial, partial round.")
|
||||
tmp_block1 = self._addroundkey(round_keys[len(round_keys) - 1], tmp_block)
|
||||
tmp_block2 = self._inv__shiftrows(tmp_block1)
|
||||
tmp_block4 = self._inv__subbytes(tmp_block2)
|
||||
|
||||
# Main rounds
|
||||
for i in range(1 , (num_rounds)):
|
||||
if self.verbose:
|
||||
print("")
|
||||
print(" Round %02d" % i)
|
||||
print(" ---------")
|
||||
|
||||
tmp_block1 = self._addroundkey(round_keys[(len(round_keys) - i - 1)], tmp_block4)
|
||||
tmp_block2 = self._inv__mixcolumns(tmp_block1)
|
||||
tmp_block3 = self._inv__shiftrows(tmp_block2)
|
||||
tmp_block4 = self._inv__subbytes(tmp_block3)
|
||||
|
||||
# Final round
|
||||
if self.verbose:
|
||||
print(" Final AddRoundKeys round.")
|
||||
res_block = self._addroundkey(round_keys[0], tmp_block4)
|
||||
|
||||
return res_block
|
||||
|
||||
def _print_block(self, block):
|
||||
"""
|
||||
Print the given block as four 32 bit words.
|
||||
"""
|
||||
(w0, w1, w2, w3) = block
|
||||
print("0x%08x, 0x%08x, 0x%08x, 0x%08x" % (w0, w1, w2, w3))
|
||||
|
||||
def _print_key(self, key):
|
||||
"""
|
||||
Print the given key as on or two sets of four 32 bit words.
|
||||
"""
|
||||
if len(key) == 8:
|
||||
(k0, k1, k2, k3, k4, k5, k6, k7) = key
|
||||
self._print_block((k0, k1, k2, k3))
|
||||
self._print_block((k4, k5, k6, k7))
|
||||
else:
|
||||
self._print_block(key)
|
||||
|
||||
def _b2w(self, b0, b1, b2, b3):
|
||||
"""
|
||||
Creates a word from the given bytes.
|
||||
"""
|
||||
return (b0 << 24) + (b1 << 16) + (b2 << 8) + b3
|
||||
|
||||
def _w2b(self, w):
|
||||
"""
|
||||
Extracts the bytes in a word.
|
||||
"""
|
||||
b0 = w >> 24
|
||||
b1 = w >> 16 & 0xff
|
||||
b2 = w >> 8 & 0xff
|
||||
b3 = w & 0xff
|
||||
return (b0, b1, b2, b3)
|
||||
|
||||
def _gm2(self, b):
|
||||
"""
|
||||
The specific Galois Multiplication by two for a given byte.
|
||||
"""
|
||||
return ((b << 1) ^ (0x1b & ((b >> 7) * 0xff))) & 0xff
|
||||
|
||||
def _gm3(self, b):
|
||||
"""
|
||||
The specific Galois Multiplication by three for a given byte.
|
||||
"""
|
||||
return self._gm2(b) ^ b
|
||||
|
||||
def _gm4(self, b):
|
||||
"""
|
||||
The specific Galois Multiplication by four for a given byte.
|
||||
"""
|
||||
return self._gm2(self._gm2(b))
|
||||
|
||||
def _gm8(self, b):
|
||||
"""
|
||||
The specific Galois Multiplication by eight for a given byte.
|
||||
"""
|
||||
return self._gm2(self._gm4(b))
|
||||
|
||||
def _gm09(self, b):
|
||||
"""
|
||||
The specific Galois Multiplication by nine for a given byte.
|
||||
"""
|
||||
return self._gm8(b) ^ b
|
||||
|
||||
def _gm11(self, b):
|
||||
"""
|
||||
The specific Galois Multiplication by 11 for a given byte.
|
||||
"""
|
||||
return self._gm8(b) ^ self._gm2(b) ^ b
|
||||
|
||||
def _gm13(self, b):
|
||||
"""
|
||||
The specific Galois Multiplication by 13 for a given byte.
|
||||
"""
|
||||
return self._gm8(b) ^ self._gm4(b) ^ b
|
||||
|
||||
def gm14(self, b):
|
||||
"""
|
||||
The specific Galois Multiplication by 14 for a given byte.
|
||||
"""
|
||||
return self._gm8(b) ^ self._gm4(b) ^ self._gm2(b)
|
||||
|
||||
def _substw(self, w):
|
||||
"""
|
||||
Returns a 32-bit word in which each of the bytes in the
|
||||
given 32-bit word has been used as lookup into the AES S-box.
|
||||
"""
|
||||
(b0, b1, b2, b3) = self._w2b(w)
|
||||
s0 = self.sbox[b0]
|
||||
s1 = self.sbox[b1]
|
||||
s2 = self.sbox[b2]
|
||||
s3 = self.sbox[b3]
|
||||
res = self._b2w(s0, s1, s2, s3)
|
||||
|
||||
if (self.verbose):
|
||||
print("Inside _substw:")
|
||||
print("b0 = 0x%02x, b1 = 0x%02x, b2 = 0x%02x, b3 = 0x%02x" %
|
||||
(b0, b1, b2, b3))
|
||||
print("s0 = 0x%02x, s1 = 0x%02x, s2 = 0x%02x, s3 = 0x%02x" %
|
||||
(s0, s1, s2, s3))
|
||||
print("res = 0x%08x" % (res))
|
||||
return res
|
||||
|
||||
def _inv__substw(self, w):
|
||||
"""
|
||||
Returns a 32-bit word in which each of the bytes in the
|
||||
given 32-bit word has been used as lookup into
|
||||
the inverse AES S-box.
|
||||
"""
|
||||
(b0, b1, b2, b3) = self._w2b(w)
|
||||
s0 = self.inv_sbox[b0]
|
||||
s1 = self.inv_sbox[b1]
|
||||
s2 = self.inv_sbox[b2]
|
||||
s3 = self.inv_sbox[b3]
|
||||
res = self._b2w(s0, s1, s2, s3)
|
||||
|
||||
if (self.verbose):
|
||||
print("Inside _inv__substw:")
|
||||
print("b0 = 0x%02x, b1 = 0x%02x, b2 = 0x%02x, b3 = 0x%02x" %
|
||||
(b0, b1, b2, b3))
|
||||
print("s0 = 0x%02x, s1 = 0x%02x, s2 = 0x%02x, s3 = 0x%02x" %
|
||||
(s0, s1, s2, s3))
|
||||
print("res = 0x%08x" % (res))
|
||||
return res
|
||||
|
||||
def _rolx(self, w, x):
|
||||
"""
|
||||
Rotate the given 32 bit word x bits left.
|
||||
"""
|
||||
return ((w << x) | (w >> (32 - x))) & 0xffffffff
|
||||
|
||||
def _next_128bit_key(self, prev_key, rcon):
|
||||
"""
|
||||
Generate the next four key words for aes-128 based on given
|
||||
rcon and previous key words.
|
||||
"""
|
||||
(w0, w1, w2, w3) = prev_key
|
||||
|
||||
rol = self._rolx(w3, 8)
|
||||
subst = self._substw(rol)
|
||||
t = subst ^ (rcon << 24)
|
||||
|
||||
k0 = w0 ^ t
|
||||
k1 = w1 ^ w0 ^ t
|
||||
k2 = w2 ^ w1 ^ w0 ^ t
|
||||
k3 = w3 ^ w2 ^ w1 ^ w0 ^ t
|
||||
|
||||
if (self.verbose):
|
||||
print("Inside next 128bit key:")
|
||||
print("w0 = 0x%08x, w1 = 0x%08x, w2 = 0x%08x, w3 = 0x%08x" %
|
||||
(w0, w1, w2, w3))
|
||||
print("rol = 0x%08x, subst = 0x%08x, rcon = 0x%02x, t = 0x%08x" %
|
||||
(rol, subst, rcon, t))
|
||||
print("k0 = 0x%08x, k1 = 0x%08x, k2 = 0x%08x, k3 = 0x%08x" %
|
||||
(k0, k1, k2, k3))
|
||||
return (k0, k1, k2, k3)
|
||||
|
||||
def _key_gen128(self, key):
|
||||
"""
|
||||
Generating the keys for 128 bit keys.
|
||||
"""
|
||||
if self.verbose:
|
||||
print("Doing the 128 bit key expansion")
|
||||
|
||||
round_keys = []
|
||||
round_keys.append(key)
|
||||
|
||||
for i in range(10):
|
||||
round_keys.append(self._next_128bit_key(round_keys[i], self._get_rcon(i + 1)))
|
||||
|
||||
if (self.verbose):
|
||||
print("Input key:")
|
||||
self._print_block(key)
|
||||
print("")
|
||||
|
||||
print("Generated keys:")
|
||||
for k in round_keys:
|
||||
self._print_block(k)
|
||||
print("")
|
||||
|
||||
return round_keys
|
||||
|
||||
def _next_256bit_key_a(self, key0, key1, rcon):
|
||||
"""
|
||||
Generate the next four key words for aes-256 using algorithm A
|
||||
based on given rcon and the previous two keys.
|
||||
"""
|
||||
(w0, w1, w2, w3) = key0
|
||||
(w4, w5, w6, w7) = key1
|
||||
|
||||
sw = self._substw(self._rolx(w7, 8))
|
||||
rw = (rcon << 24)
|
||||
t = sw ^ rw
|
||||
|
||||
k0 = w0 ^ t
|
||||
k1 = w1 ^ w0 ^ t
|
||||
k2 = w2 ^ w1 ^ w0 ^ t
|
||||
k3 = w3 ^ w2 ^ w1 ^ w0 ^ t
|
||||
|
||||
if (self.dump_vars):
|
||||
print("next_256bit_key_a:")
|
||||
print("w0 = 0x%08x, w0 = 0x%08x, w0 = 0x%08x, w0 = 0x%08x" % (w0, w1, w2, w3))
|
||||
print("w4 = 0x%08x, w5 = 0x%08x, w6 = 0x%08x, w7 = 0x%08x" % (w4, w5, w6, w7))
|
||||
print("t = 0x%08x, sw = 0x%08x, rw = 0x%08x" % (t, sw, rw))
|
||||
print("k0 = 0x%08x, k0 = 0x%08x, k0 = 0x%08x, k0 = 0x%08x" % (k0, k1, k2, k3))
|
||||
print("")
|
||||
|
||||
return (k0, k1, k2, k3)
|
||||
|
||||
def _next_256bit_key_b(self, key0, key1):
|
||||
"""
|
||||
Generate the next four key words for aes-256 using algorithm B
|
||||
based on given previous eight keywords.
|
||||
"""
|
||||
(w0, w1, w2, w3) = key0
|
||||
(w4, w5, w6, w7) = key1
|
||||
|
||||
t = self._substw(w7)
|
||||
|
||||
k0 = w0 ^ t
|
||||
k1 = w1 ^ w0 ^ t
|
||||
k2 = w2 ^ w1 ^ w0 ^ t
|
||||
k3 = w3 ^ w2 ^ w1 ^ w0 ^ t
|
||||
|
||||
if (self.dump_vars):
|
||||
print("next_256bit_key_b:")
|
||||
print("w0 = 0x%08x, w0 = 0x%08x, w0 = 0x%08x, w0 = 0x%08x" % (w0, w1, w2, w3))
|
||||
print("w4 = 0x%08x, w5 = 0x%08x, w6 = 0x%08x, w7 = 0x%08x" % (w4, w5, w6, w7))
|
||||
print("t = 0x%08x" % (t))
|
||||
print("k0 = 0x%08x, k0 = 0x%08x, k0 = 0x%08x, k0 = 0x%08x" % (k0, k1, k2, k3))
|
||||
print("")
|
||||
|
||||
return (k0, k1, k2, k3)
|
||||
|
||||
def _key_gen256(self, key):
|
||||
"""
|
||||
Generating the keys for 256 bit keys.
|
||||
"""
|
||||
round_keys = []
|
||||
(k0, k1, k2, k3, k4, k5, k6, k7) = key
|
||||
|
||||
round_keys.append((k0, k1, k2, k3))
|
||||
round_keys.append((k4, k5, k6, k7))
|
||||
|
||||
j = 1
|
||||
for i in range(0, (AES_256_ROUNDS - 2), 2):
|
||||
k = self._next_256bit_key_a(round_keys[i], round_keys[i + 1], self._get_rcon(j))
|
||||
round_keys.append(k)
|
||||
k = self._next_256bit_key_b(round_keys[i + 1], round_keys[i + 2])
|
||||
round_keys.append(k)
|
||||
j += 1
|
||||
|
||||
# One final key needs to be generated.
|
||||
k = self._next_256bit_key_a(round_keys[12], round_keys[13], self._get_rcon(7))
|
||||
round_keys.append(k)
|
||||
|
||||
if (self.verbose):
|
||||
print("Input key:")
|
||||
self._print_block((k0, k1, k2, k3))
|
||||
self._print_block((k4, k5, k6, k7))
|
||||
print("")
|
||||
|
||||
print("Generated keys:")
|
||||
for k in round_keys:
|
||||
self._print_block(k)
|
||||
print("")
|
||||
|
||||
return round_keys
|
||||
|
||||
def _get_rcon(self, round):
|
||||
"""
|
||||
Function implementation of rcon. Calculates rcon for a
|
||||
given round. This could be implemented as an iterator.
|
||||
"""
|
||||
rcon = 0x8d
|
||||
|
||||
for i in range(0, round):
|
||||
rcon = ((rcon << 1) ^ (0x11b & - (rcon >> 7))) & 0xff
|
||||
|
||||
return rcon
|
||||
|
||||
def _addroundkey(self, key, block):
|
||||
"""
|
||||
AES AddRoundKey block operation.
|
||||
Perform XOR combination of the given block and the given key.
|
||||
"""
|
||||
(w0, w1, w2, w3) = block
|
||||
(k0, k1, k2, k3) = key
|
||||
|
||||
res_block = (w0 ^ k0, w1 ^ k1, w2 ^ k2, w3 ^ k3)
|
||||
|
||||
if (self.verbose):
|
||||
print("AddRoundKey key, block in and block out:")
|
||||
self._print_block(key)
|
||||
self._print_block(block)
|
||||
self._print_block(res_block)
|
||||
print("")
|
||||
|
||||
return res_block
|
||||
|
||||
def _mixw(self, w):
|
||||
"""
|
||||
Perform bit mixing of the given words.
|
||||
"""
|
||||
(b0, b1, b2, b3) = self._w2b(w)
|
||||
|
||||
mb0 = self._gm2(b0) ^ self._gm3(b1) ^ b2 ^ b3
|
||||
mb1 = b0 ^ self._gm2(b1) ^ self._gm3(b2) ^ b3
|
||||
mb2 = b0 ^ b1 ^ self._gm2(b2) ^ self._gm3(b3)
|
||||
mb3 = self._gm3(b0) ^ b1 ^ b2 ^ self._gm2(b3)
|
||||
|
||||
return self._b2w(mb0, mb1, mb2, mb3)
|
||||
|
||||
def _mixcolumns(self, block):
|
||||
"""
|
||||
AES MixColumns on the given block.
|
||||
"""
|
||||
(c0, c1, c2, c3) = block
|
||||
|
||||
mc0 = self._mixw(c0)
|
||||
mc1 = self._mixw(c1)
|
||||
mc2 = self._mixw(c2)
|
||||
mc3 = self._mixw(c3)
|
||||
|
||||
res_block = (mc0, mc1, mc2, mc3)
|
||||
|
||||
if (self.verbose):
|
||||
print("MixColumns block in and block out:")
|
||||
self._print_block(block)
|
||||
self._print_block(res_block)
|
||||
print("")
|
||||
|
||||
return res_block
|
||||
|
||||
def _subbytes(self, block):
|
||||
"""
|
||||
AES SubBytes operation on the given block.
|
||||
"""
|
||||
(w0, w1, w2, w3) = block
|
||||
|
||||
res_block = (self._substw(w0), self._substw(w1),
|
||||
self._substw(w2), self._substw(w3))
|
||||
|
||||
if (self.verbose):
|
||||
print("SubBytes block in and block out:")
|
||||
self._print_block(block)
|
||||
self._print_block(res_block)
|
||||
print("")
|
||||
|
||||
return res_block
|
||||
|
||||
def _shiftrows(self, block):
|
||||
"""
|
||||
AES ShiftRows block operation.
|
||||
"""
|
||||
(w0, w1, w2, w3) = block
|
||||
|
||||
c0 = self._w2b(w0)
|
||||
c1 = self._w2b(w1)
|
||||
c2 = self._w2b(w2)
|
||||
c3 = self._w2b(w3)
|
||||
|
||||
ws0 = self._b2w(c0[0], c1[1], c2[2], c3[3])
|
||||
ws1 = self._b2w(c1[0], c2[1], c3[2], c0[3])
|
||||
ws2 = self._b2w(c2[0], c3[1], c0[2], c1[3])
|
||||
ws3 = self._b2w(c3[0], c0[1], c1[2], c2[3])
|
||||
|
||||
res_block = (ws0, ws1, ws2, ws3)
|
||||
|
||||
if (self.verbose):
|
||||
print("ShiftRows block in and block out:")
|
||||
self._print_block(block)
|
||||
self._print_block(res_block)
|
||||
print("")
|
||||
|
||||
return res_block
|
||||
|
||||
def _inv__mixw(self, w):
|
||||
"""
|
||||
Perform inverse bit mixing of the given words.
|
||||
"""
|
||||
(b0, b1, b2, b3) = self._w2b(w)
|
||||
|
||||
mb0 = self.gm14(b0) ^ self._gm11(b1) ^ self._gm13(b2) ^ self._gm09(b3)
|
||||
mb1 = self._gm09(b0) ^ self.gm14(b1) ^ self._gm11(b2) ^ self._gm13(b3)
|
||||
mb2 = self._gm13(b0) ^ self._gm09(b1) ^ self.gm14(b2) ^ self._gm11(b3)
|
||||
mb3 = self._gm11(b0) ^ self._gm13(b1) ^ self._gm09(b2) ^ self.gm14(b3)
|
||||
|
||||
return self._b2w(mb0, mb1, mb2, mb3)
|
||||
|
||||
def _inv__mixcolumns(self, block):
|
||||
"""
|
||||
AES Inverse MixColumns on the given block.
|
||||
"""
|
||||
(c0, c1, c2, c3) = block
|
||||
|
||||
mc0 = self._inv__mixw(c0)
|
||||
mc1 = self._inv__mixw(c1)
|
||||
mc2 = self._inv__mixw(c2)
|
||||
mc3 = self._inv__mixw(c3)
|
||||
|
||||
res_block = (mc0, mc1, mc2, mc3)
|
||||
|
||||
if (self.verbose):
|
||||
print("Inverse MixColumns block in and block out:")
|
||||
self._print_block(block)
|
||||
self._print_block(res_block)
|
||||
print("")
|
||||
|
||||
return res_block
|
||||
|
||||
def _inv__shiftrows(self, block):
|
||||
"""
|
||||
AES inverse ShiftRows block operation.
|
||||
"""
|
||||
(w0, w1, w2, w3) = block
|
||||
|
||||
c0 = self._w2b(w0)
|
||||
c1 = self._w2b(w1)
|
||||
c2 = self._w2b(w2)
|
||||
c3 = self._w2b(w3)
|
||||
|
||||
ws0 = self._b2w(c0[0], c3[1], c2[2], c1[3])
|
||||
ws1 = self._b2w(c1[0], c0[1], c3[2], c2[3])
|
||||
ws2 = self._b2w(c2[0], c1[1], c0[2], c3[3])
|
||||
ws3 = self._b2w(c3[0], c2[1], c1[2], c0[3])
|
||||
|
||||
res_block = (ws0, ws1, ws2, ws3)
|
||||
|
||||
if (self.verbose):
|
||||
print("Inverse ShiftRows block in and block out:")
|
||||
self._print_block(block)
|
||||
self._print_block(res_block)
|
||||
print("")
|
||||
|
||||
return res_block
|
||||
|
||||
def _inv__subbytes(self, block):
|
||||
"""
|
||||
AES inverse SubBytes operation on the given block.
|
||||
"""
|
||||
(w0, w1, w2, w3) = block
|
||||
|
||||
res_block = (self._inv__substw(w0), self._inv__substw(w1),
|
||||
self._inv__substw(w2), self._inv__substw(w3))
|
||||
|
||||
if (self.verbose):
|
||||
print("Inverse SubBytes block in and block out:")
|
||||
self._print_block(block)
|
||||
self._print_block(res_block)
|
||||
print("")
|
||||
|
||||
return res_block
|
||||
|
|
@ -0,0 +1,265 @@
|
|||
#!/usr/bin/env python3
|
||||
# -*- coding: utf-8 -*-
|
||||
#=======================================================================
|
||||
# Author: Joachim Strömbergson
|
||||
# Copyright (c) 2016, Secworks Sweden AB
|
||||
# All rights reserved.
|
||||
#
|
||||
# Redistribution and use in source and binary forms, with or
|
||||
# without modification, are permitted provided that the following
|
||||
# conditions are met:
|
||||
#
|
||||
# 1. Redistributions of source code must retain the above copyright
|
||||
# notice, this list of conditions and the following disclaimer.
|
||||
#
|
||||
# 2. Redistributions in binary form must reproduce the above copyright
|
||||
# notice, this list of conditions and the following disclaimer in
|
||||
# the documentation and/or other materials provided with the
|
||||
# distribution.
|
||||
#
|
||||
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
||||
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
||||
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
||||
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
||||
# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||||
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
|
||||
# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
#
|
||||
#=======================================================================
|
||||
|
||||
from uaes import AesCypher
|
||||
|
||||
R128 = (0, 0, 0, 0x00000087)
|
||||
MAX128 = ((2**128) - 1)
|
||||
AES_BLOCK_LENGTH = 128
|
||||
AES_BLOCK_BYTES_LENGTH = int(AES_BLOCK_LENGTH / 4)
|
||||
SUB_BLOCK_BYTES_LENGTH = 8
|
||||
|
||||
|
||||
class CmacHasher():
|
||||
def __init__(self, key=(0x00000000, 0x00000000, 0x00000000, 0x00000000), verbose = False):
|
||||
self.verbose = verbose
|
||||
self.cypher = AesCypher(verbose=verbose, dump_vars=verbose)
|
||||
self.current_block = b''
|
||||
self.message = []
|
||||
self.key = key
|
||||
|
||||
def pad_block(self, block_in_bytes):
|
||||
"""
|
||||
Pads a given block with the "1000...." padding.
|
||||
|
||||
Parameters
|
||||
----------
|
||||
block_in_bytes : bytes array
|
||||
bytes array to complete with the appropriate padding
|
||||
|
||||
Returns
|
||||
-------
|
||||
tuple(int, int, int, int)
|
||||
Block with padding split in the cmac block format
|
||||
"""
|
||||
if len(block_in_bytes) < AES_BLOCK_BYTES_LENGTH:
|
||||
block_in_bytes += b'8'
|
||||
block_in_bytes += b'0' * (AES_BLOCK_BYTES_LENGTH - len(block_in_bytes))
|
||||
|
||||
return self._bytes_to_block(block_in_bytes)
|
||||
|
||||
def update(self, bytes_value):
|
||||
"""
|
||||
Adds the given bytes value to the current block.
|
||||
If the current block reaches the CMAC block size, the bytes array
|
||||
is converted into a block of 4 integers and added to the message.
|
||||
|
||||
Parameters
|
||||
----------
|
||||
bytes_value : bytes array
|
||||
Hexadecimal value to concatenate in the message
|
||||
"""
|
||||
free_space = AES_BLOCK_BYTES_LENGTH - len(self.current_block)
|
||||
n_extra_bytes = len(bytes_value) - free_space
|
||||
|
||||
if n_extra_bytes > 0:
|
||||
while(n_extra_bytes > 0):
|
||||
self.current_block += bytes_value[:free_space]
|
||||
self._update_message()
|
||||
|
||||
self.current_block = b''
|
||||
bytes_value = bytes_value[free_space:]
|
||||
free_space = AES_BLOCK_BYTES_LENGTH - len(self.current_block)
|
||||
n_extra_bytes = len(bytes_value) - free_space
|
||||
|
||||
self.current_block = bytes_value
|
||||
else:
|
||||
self.current_block += bytes_value
|
||||
if n_extra_bytes == 0:
|
||||
self._update_message()
|
||||
self.current_block = b''
|
||||
|
||||
def xor_words(self, a, b):
|
||||
"""
|
||||
Apply an XOR operator element to element between a and b.
|
||||
|
||||
Parameters
|
||||
----------
|
||||
a : tuple(int, int, int, int)
|
||||
Tuple of four integers to be 'xor-ed' with b
|
||||
b : tuple(int, int, int, int)
|
||||
Tuple of four integers to be 'xor-ed' with a
|
||||
|
||||
Returns
|
||||
-------
|
||||
tuple(int, int, int, int)
|
||||
Result of the element to element xor operation.
|
||||
"""
|
||||
c = (a[0] ^ b[0], a[1] ^ b[1], a[2] ^ b[2], a[3] ^ b[3])
|
||||
if (self.verbose):
|
||||
print("XORing words in the following two 128 bit block gives the result:")
|
||||
self.cypher.print_block(a)
|
||||
self.cypher.print_block(b)
|
||||
self.cypher.print_block(c)
|
||||
return c
|
||||
|
||||
def cmac_gen_subkeys(self, key):
|
||||
"""
|
||||
Generate subkeys K1 and K2.
|
||||
K1 is used to generate complete message, i.e. where all blocks contain
|
||||
128 bits of information.
|
||||
K2 is used to generate incomplete messages, i.e with a final block length
|
||||
lower than 128 bits.
|
||||
|
||||
Parameters
|
||||
----------
|
||||
key : tuple
|
||||
128 or 256 bits key to compute the aes cmac key
|
||||
|
||||
Returns
|
||||
-------
|
||||
tuple
|
||||
K1 and K2
|
||||
"""
|
||||
L = self.cypher.aes_encipher_block(key, (0, 0, 0, 0))
|
||||
Pre_K1 = self._shift_words(L)
|
||||
MSBL = (L[0] >> 31) & 0x01
|
||||
if MSBL:
|
||||
K1 = self.xor_words(Pre_K1, R128)
|
||||
else:
|
||||
K1 = Pre_K1
|
||||
|
||||
Pre_K2 = self._shift_words(K1)
|
||||
MSBK1 = (K1[0] >> 31) & 0x01
|
||||
if MSBK1:
|
||||
K2 = self.xor_words(Pre_K2, R128)
|
||||
else:
|
||||
K2 = Pre_K2
|
||||
|
||||
if (self.verbose):
|
||||
print("Internal data during sub key generation")
|
||||
print("---------------------------------------")
|
||||
print("L:")
|
||||
self.cypher.print_block(L)
|
||||
|
||||
print("MSBL = 0x%01x" % MSBL)
|
||||
print("Pre_K1:")
|
||||
self.cypher.print_block(Pre_K1)
|
||||
print("K1:")
|
||||
self.cypher.print_block(K1)
|
||||
print("MSBK1 = 0x%01x" % MSBK1)
|
||||
print("Pre_K2:")
|
||||
self.cypher.print_block(Pre_K2)
|
||||
print("K2:")
|
||||
self.cypher.print_block(K2)
|
||||
print()
|
||||
|
||||
return (K1, K2)
|
||||
|
||||
def digest(self):
|
||||
"""
|
||||
Hash the message given to the hasher.
|
||||
The message is a list of 4-integers blocks, if the last block
|
||||
does not contain 128 bits of information, it will be padded.
|
||||
|
||||
Returns
|
||||
-------
|
||||
bytes array
|
||||
Hash value for the given message
|
||||
"""
|
||||
import struct
|
||||
key = self.key
|
||||
final_length = len(self.current_block) * 4 if len(self.current_block) != 0 else AES_BLOCK_LENGTH
|
||||
|
||||
message = self.message
|
||||
|
||||
# Start by generating the subkeys
|
||||
(K1, K2) = self.cmac_gen_subkeys(key)
|
||||
print("CMAC Subkeys generated.")
|
||||
state = (0x00000000, 0x00000000, 0x00000000, 0x00000000)
|
||||
blocks = len(message) if final_length == AES_BLOCK_LENGTH else len(message) + 1
|
||||
|
||||
if blocks == 0:
|
||||
# Empty message.
|
||||
paddded_block = self.pad_block(self.current_block)
|
||||
tweak = self.xor_words(paddded_block, K2)
|
||||
if (self.verbose):
|
||||
print("tweak empty block")
|
||||
self.cypher.print_block(tweak)
|
||||
cmac_hash = self.cypher.aes_encipher_block(key, tweak)
|
||||
|
||||
else:
|
||||
for i in range(blocks - 1):
|
||||
state = self.xor_words(state, message[i])
|
||||
if (self.verbose):
|
||||
print("state before aes block %d:" % (i + 1))
|
||||
self.cypher.print_block(state)
|
||||
state = self.cypher.aes_encipher_block(key, state)
|
||||
if (self.verbose):
|
||||
print("state after aes block %d:" % (i + 1))
|
||||
self.cypher.print_block(state)
|
||||
|
||||
if (final_length == AES_BLOCK_LENGTH):
|
||||
tweak = self.xor_words(K1, message[-1])
|
||||
if (self.verbose):
|
||||
print("tweak complete final block")
|
||||
self.cypher.print_block(tweak)
|
||||
|
||||
else:
|
||||
padded_block = self.pad_block(self.current_block)
|
||||
tweak = self.xor_words(K2, padded_block)
|
||||
if (self.verbose):
|
||||
print("tweak incomplete final block")
|
||||
self.cypher.print_block(tweak)
|
||||
|
||||
state = self.xor_words(state, tweak)
|
||||
if (self.verbose):
|
||||
print("state before aes final block:")
|
||||
self.cypher.print_block(state)
|
||||
cmac_hash = self.cypher.aes_encipher_block(key, state)
|
||||
if (self.verbose):
|
||||
print("state after aes final block:")
|
||||
self.cypher.print_block(cmac_hash)
|
||||
|
||||
print("CMAC hash generated: ", cmac_hash)
|
||||
cmac_hash = struct.pack('<IIII', *cmac_hash)
|
||||
print("CMAC hash (bytes): ", cmac_hash)
|
||||
return cmac_hash
|
||||
|
||||
def _bytes_to_block(self, block_in_bytes):
|
||||
sub_blocks = []
|
||||
for sb_start in range(0, AES_BLOCK_BYTES_LENGTH, SUB_BLOCK_BYTES_LENGTH):
|
||||
sub_blocks.append(int("0x" + block_in_bytes[sb_start:sb_start + SUB_BLOCK_BYTES_LENGTH].decode()) )
|
||||
|
||||
return tuple(sub_blocks)
|
||||
|
||||
def _update_message(self):
|
||||
block = self._bytes_to_block(self.current_block)
|
||||
self.message.append(block)
|
||||
|
||||
def _shift_words(self, wl):
|
||||
w = ((wl[0] << 96) + (wl[1] << 64) + (wl[2] << 32) + wl[3]) & MAX128
|
||||
ws = w << 1 & MAX128
|
||||
return ((ws >> 96) & 0xffffffff, (ws >> 64) & 0xffffffff,
|
||||
(ws >> 32) & 0xffffffff, ws & 0xffffffff)
|
||||
Ładowanie…
Reference in New Issue