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test_keywrap.doctest - test keywrap functions
Copyright (C) 2014-2016 Arthur de Jong
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
>>> from binascii import a2b_hex
>>> from pskc.crypto.aeskw import wrap, unwrap
Wrap 128 bits of Key Data with a 128-bit KEK (test vector 4.1 from RFC 3394).
>>> key = a2b_hex('000102030405060708090A0B0C0D0E0F')
>>> plaintext = a2b_hex('00112233445566778899AABBCCDDEEFF')
>>> ciphertext = a2b_hex('1FA68B0A8112B447AEF34BD8FB5A7B829D3E862371D2CFE5')
>>> wrap(plaintext, key) == ciphertext
True
>>> unwrap(ciphertext, key) == plaintext
True
Wrap 128 bits of Key Data with a 192-bit KEK (test vector 4.2 from RFC 3394).
>>> key = a2b_hex('000102030405060708090A0B0C0D0E0F1011121314151617')
>>> plaintext = a2b_hex('00112233445566778899AABBCCDDEEFF')
>>> ciphertext = a2b_hex('96778B25AE6CA435F92B5B97C050AED2468AB8A17AD84E5D')
>>> wrap(plaintext, key) == ciphertext
True
>>> unwrap(ciphertext, key) == plaintext
True
Wrap 128 bits of Key Data with a 256-bit KEK (test vector 4.3 from RFC 3394).
>>> key = a2b_hex('000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F')
>>> plaintext = a2b_hex('00112233445566778899AABBCCDDEEFF')
>>> ciphertext = a2b_hex('64E8C3F9CE0F5BA263E9777905818A2A93C8191E7D6E8AE7')
>>> wrap(plaintext, key) == ciphertext
True
>>> unwrap(ciphertext, key) == plaintext
True
Wrap 192 bits of Key Data with a 192-bit KEK (test vector 4.4 from RFC 3394).
>>> key = a2b_hex('000102030405060708090A0B0C0D0E0F1011121314151617')
>>> plaintext = a2b_hex('00112233445566778899AABBCCDDEEFF0001020304050607')
>>> ciphertext = a2b_hex('031D33264E15D33268F24EC260743EDCE1C6C7DDEE725A936BA814915C6762D2')
>>> wrap(plaintext, key) == ciphertext
True
>>> unwrap(ciphertext, key) == plaintext
True
Wrap 192 bits of Key Data with a 256-bit KEK (test vector 4.5 from RFC 3394).
>>> key = a2b_hex('000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F')
>>> plaintext = a2b_hex('00112233445566778899AABBCCDDEEFF0001020304050607')
>>> ciphertext = a2b_hex('A8F9BC1612C68B3FF6E6F4FBE30E71E4769C8B80A32CB8958CD5D17D6B254DA1')
>>> wrap(plaintext, key) == ciphertext
True
>>> unwrap(ciphertext, key) == plaintext
True
Wrap 256 bits of Key Data with a 256-bit KEK (test vector 4.6 from RFC 3394).
>>> key = a2b_hex('000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F')
>>> plaintext = a2b_hex('00112233445566778899AABBCCDDEEFF000102030405060708090A0B0C0D0E0F')
>>> ciphertext = a2b_hex('28C9F404C4B810F4CBCCB35CFB87F8263F5786E2D80ED326CBC7F0E71A99F43BFB988B9B7A02DD21')
>>> wrap(plaintext, key) == ciphertext
True
>>> unwrap(ciphertext, key) == plaintext
True
Mangling the ciphertext and unwrapping results in an exception:
>>> ciphertext = b'XX' + ciphertext[2:]
>>> unwrap(ciphertext, key) # doctest: +IGNORE_EXCEPTION_DETAIL
Traceback (most recent call last):
...
DecryptionError: IV does not match
>>> ciphertext = ciphertext[2:]
>>> unwrap(ciphertext, key) # doctest: +IGNORE_EXCEPTION_DETAIL
Traceback (most recent call last):
...
DecryptionError: Ciphertext length wrong
Wrap 20 octets with a 192-bit key (first example from section 6 of RFC 5649).
>>> key = a2b_hex('5840df6e29b02af1ab493b705bf16ea1ae8338f4dcc176a8')
>>> plaintext = a2b_hex('c37b7e6492584340bed12207808941155068f738')
>>> ciphertext = a2b_hex('138bdeaa9b8fa7fc61f97742e72248ee5ae6ae5360d1ae6a5f54f373fa543b6a')
>>> wrap(plaintext, key) == ciphertext
True
>>> unwrap(ciphertext, key) == plaintext
True
>>> wrap(plaintext, key, pad=False) # doctest: +IGNORE_EXCEPTION_DETAIL
Traceback (most recent call last):
...
EncryptionError: Plaintext length wrong
>>> unwrap(ciphertext, key, pad=False) # doctest: +IGNORE_EXCEPTION_DETAIL
Traceback (most recent call last):
...
DecryptionError: IV does not match
Wrap 7 octets with a 192-bit key (second example from section 6 of RFC 5649).
>>> key = a2b_hex('5840df6e29b02af1ab493b705bf16ea1ae8338f4dcc176a8')
>>> plaintext = a2b_hex('466f7250617369')
>>> ciphertext = a2b_hex('afbeb0f07dfbf5419200f2ccb50bb24f')
>>> wrap(plaintext, key) == ciphertext
True
>>> unwrap(ciphertext, key) == plaintext
True
>>> wrap(plaintext, key, pad=False) # disable padding
Traceback (most recent call last):
...
EncryptionError: Plaintext length wrong
>>> unwrap(ciphertext, key, pad=False)
Traceback (most recent call last):
...
DecryptionError: Ciphertext length wrong
Normally padding is only done if needed but it can be forced.
>>> key = a2b_hex('000102030405060708090A0B0C0D0E0F')
>>> plaintext = a2b_hex('00112233445566778899AABBCCDDEEFF')
>>> ciphertext = a2b_hex('1FA68B0A8112B447AEF34BD8FB5A7B829D3E862371D2CFE5')
>>> wrap(plaintext, key) == ciphertext
True
>>> unwrap(ciphertext, key) == plaintext
True
>>> ciphertext = a2b_hex('2cef0c9e30de26016c230cb78bc60d51b1fe083ba0c79cd5')
>>> wrap(plaintext, key, pad=True) == ciphertext
True
>>> unwrap(ciphertext, key) == plaintext
True
>>> unwrap(ciphertext, key, pad=False) # disabling padding fails IV check
Traceback (most recent call last):
...
DecryptionError: IV does not match
Padding can also be disabled. This also disables the shortcut for small
plaintexts as described in RFC 5649.
>>> key = a2b_hex('000102030405060708090A0B0C0D0E0F')
>>> plaintext = a2b_hex('0011223344556677')
>>> ciphertext = a2b_hex('f4740052e82a225174ce86fbd7b805e7')
>>> wrap(plaintext, key) == ciphertext
True
>>> unwrap(ciphertext, key) == plaintext
True
>>> wrap(plaintext, key, pad=False) # disable padding
Traceback (most recent call last):
...
EncryptionError: Plaintext length wrong
>>> unwrap(ciphertext, key, pad=False)
Traceback (most recent call last):
...
DecryptionError: Ciphertext length wrong
Lastly, an explicit IV can be set but this disables the padding functionality.
>>> key = a2b_hex('000102030405060708090A0B0C0D0E0F')
>>> plaintext = a2b_hex('0011223344556677')
>>> iv = a2b_hex('1010101010101010')
>>> wrap(plaintext, key, iv)
Traceback (most recent call last):
...
EncryptionError: Plaintext length wrong
>>> plaintext = a2b_hex('00112233445566778899AABBCCDDEEFF')
>>> ciphertext = a2b_hex('4cd926c570e19c35ace71d59a1062dae850e6a709066e0bf')
>>> wrap(plaintext, key, iv) == ciphertext
True
>>> unwrap(ciphertext, key, iv) == plaintext
True
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