From d00852509aa3702827941882941dc1c76368cf8c Mon Sep 17 00:00:00 2001 From: Michael Manganiello Date: Sat, 10 Jun 2017 06:29:32 -0300 Subject: PKCS#1 2.0: Implementation of MGF1 (#89) Implementation of the Mask Generation Function `MGF1` used in the OAEP encoding step. For more information, the MGF1 specification is at https://tools.ietf.org/html/rfc2437#section-10.2.1 --- tests/test_pkcs1_v2.py | 83 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 83 insertions(+) create mode 100644 tests/test_pkcs1_v2.py (limited to 'tests') diff --git a/tests/test_pkcs1_v2.py b/tests/test_pkcs1_v2.py new file mode 100644 index 0000000..1d8f001 --- /dev/null +++ b/tests/test_pkcs1_v2.py @@ -0,0 +1,83 @@ +# -*- coding: utf-8 -*- +# +# Copyright 2011 Sybren A. Stüvel +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# https://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. + +"""Tests PKCS #1 version 2 functionality. + +Most of the mocked values come from the test vectors found at: +http://www.itomorrowmag.com/emc-plus/rsa-labs/standards-initiatives/pkcs-rsa-cryptography-standard.htm +""" + +import unittest + +from rsa import pkcs1_v2 + + +class MGFTest(unittest.TestCase): + def test_oaep_int_db_mask(self): + seed = ( + b'\xaa\xfd\x12\xf6\x59\xca\xe6\x34\x89\xb4\x79\xe5\x07\x6d\xde\xc2' + b'\xf0\x6c\xb5\x8f' + ) + db = ( + b'\xda\x39\xa3\xee\x5e\x6b\x4b\x0d\x32\x55\xbf\xef\x95\x60\x18\x90' + b'\xaf\xd8\x07\x09\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00' + b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00' + b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00' + b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00' + b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\xd4\x36\xe9\x95\x69' + b'\xfd\x32\xa7\xc8\xa0\x5b\xbc\x90\xd3\x2c\x49' + ) + masked_db = ( + b'\xdc\xd8\x7d\x5c\x68\xf1\xee\xa8\xf5\x52\x67\xc3\x1b\x2e\x8b\xb4' + b'\x25\x1f\x84\xd7\xe0\xb2\xc0\x46\x26\xf5\xaf\xf9\x3e\xdc\xfb\x25' + b'\xc9\xc2\xb3\xff\x8a\xe1\x0e\x83\x9a\x2d\xdb\x4c\xdc\xfe\x4f\xf4' + b'\x77\x28\xb4\xa1\xb7\xc1\x36\x2b\xaa\xd2\x9a\xb4\x8d\x28\x69\xd5' + b'\x02\x41\x21\x43\x58\x11\x59\x1b\xe3\x92\xf9\x82\xfb\x3e\x87\xd0' + b'\x95\xae\xb4\x04\x48\xdb\x97\x2f\x3a\xc1\x4f\x7b\xc2\x75\x19\x52' + b'\x81\xce\x32\xd2\xf1\xb7\x6d\x4d\x35\x3e\x2d' + ) + + # dbMask = MGF(seed, length(DB)) + db_mask = pkcs1_v2.mgf1(seed, length=len(db)) + expected_db_mask = ( + b'\x06\xe1\xde\xb2\x36\x9a\xa5\xa5\xc7\x07\xd8\x2c\x8e\x4e\x93\x24' + b'\x8a\xc7\x83\xde\xe0\xb2\xc0\x46\x26\xf5\xaf\xf9\x3e\xdc\xfb\x25' + b'\xc9\xc2\xb3\xff\x8a\xe1\x0e\x83\x9a\x2d\xdb\x4c\xdc\xfe\x4f\xf4' + b'\x77\x28\xb4\xa1\xb7\xc1\x36\x2b\xaa\xd2\x9a\xb4\x8d\x28\x69\xd5' + b'\x02\x41\x21\x43\x58\x11\x59\x1b\xe3\x92\xf9\x82\xfb\x3e\x87\xd0' + b'\x95\xae\xb4\x04\x48\xdb\x97\x2f\x3a\xc1\x4e\xaf\xf4\x9c\x8c\x3b' + b'\x7c\xfc\x95\x1a\x51\xec\xd1\xdd\xe6\x12\x64' + ) + + self.assertEqual(db_mask, expected_db_mask) + + # seedMask = MGF(maskedDB, length(seed)) + seed_mask = pkcs1_v2.mgf1(masked_db, length=len(seed)) + expected_seed_mask = ( + b'\x41\x87\x0b\x5a\xb0\x29\xe6\x57\xd9\x57\x50\xb5\x4c\x28\x3c\x08' + b'\x72\x5d\xbe\xa9' + ) + + self.assertEqual(seed_mask, expected_seed_mask) + + def test_invalid_hasher(self): + """Tests an invalid hasher generates an exception""" + with self.assertRaises(ValueError): + pkcs1_v2.mgf1(b'\x06\xe1\xde\xb2', length=8, hasher='SHA2') + + def test_invalid_length(self): + with self.assertRaises(OverflowError): + pkcs1_v2.mgf1(b'\x06\xe1\xde\xb2', length=2**50) -- cgit v1.2.1