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# Copyright 2011 Sybren A. Stüvel <sybren@stuvel.eu>
#
# 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.
"""Unittest for saving and loading keys."""
import base64
import os.path
import pickle
import unittest
import warnings
from unittest import mock
import rsa.key
B64PRIV_DER = b'MC4CAQACBQDeKYlRAgMBAAECBQDHn4npAgMA/icCAwDfxwIDANcXAgInbwIDAMZt'
PRIVATE_DER = base64.standard_b64decode(B64PRIV_DER)
B64PUB_DER = b'MAwCBQDeKYlRAgMBAAE='
PUBLIC_DER = base64.standard_b64decode(B64PUB_DER)
PRIVATE_PEM = b'''\
-----BEGIN CONFUSING STUFF-----
Cruft before the key
-----BEGIN RSA PRIVATE KEY-----
Comment: something blah
''' + B64PRIV_DER + b'''
-----END RSA PRIVATE KEY-----
Stuff after the key
-----END CONFUSING STUFF-----
'''
CLEAN_PRIVATE_PEM = b'''\
-----BEGIN RSA PRIVATE KEY-----
''' + B64PRIV_DER + b'''
-----END RSA PRIVATE KEY-----
'''
PUBLIC_PEM = b'''\
-----BEGIN CONFUSING STUFF-----
Cruft before the key
-----BEGIN RSA PUBLIC KEY-----
Comment: something blah
''' + B64PUB_DER + b'''
-----END RSA PUBLIC KEY-----
Stuff after the key
-----END CONFUSING STUFF-----
'''
CLEAN_PUBLIC_PEM = b'''\
-----BEGIN RSA PUBLIC KEY-----
''' + B64PUB_DER + b'''
-----END RSA PUBLIC KEY-----
'''
class DerTest(unittest.TestCase):
"""Test saving and loading DER keys."""
def test_load_private_key(self):
"""Test loading private DER keys."""
key = rsa.key.PrivateKey.load_pkcs1(PRIVATE_DER, 'DER')
expected = rsa.key.PrivateKey(3727264081, 65537, 3349121513, 65063, 57287)
self.assertEqual(expected, key)
self.assertEqual(key.exp1, 55063)
self.assertEqual(key.exp2, 10095)
self.assertEqual(key.coef, 50797)
@mock.patch('pyasn1.codec.der.decoder.decode')
def test_load_malformed_private_key(self, der_decode):
"""Test loading malformed private DER keys."""
# Decode returns an invalid exp2 value.
der_decode.return_value = (
[0, 3727264081, 65537, 3349121513, 65063, 57287, 55063, 0, 50797],
0,
)
with warnings.catch_warnings(record=True) as w:
# Always print warnings
warnings.simplefilter('always')
# Load 3 keys
for _ in range(3):
key = rsa.key.PrivateKey.load_pkcs1(PRIVATE_DER, 'DER')
# Check that 3 warnings were generated.
self.assertEqual(3, len(w))
for warning in w:
self.assertTrue(issubclass(warning.category, UserWarning))
self.assertIn('malformed', str(warning.message))
# Check that we are creating the key with correct values
self.assertEqual(key.exp1, 55063)
self.assertEqual(key.exp2, 10095)
self.assertEqual(key.coef, 50797)
def test_save_private_key(self):
"""Test saving private DER keys."""
key = rsa.key.PrivateKey(3727264081, 65537, 3349121513, 65063, 57287)
der = key.save_pkcs1('DER')
self.assertIsInstance(der, bytes)
self.assertEqual(PRIVATE_DER, der)
def test_load_public_key(self):
"""Test loading public DER keys."""
key = rsa.key.PublicKey.load_pkcs1(PUBLIC_DER, 'DER')
expected = rsa.key.PublicKey(3727264081, 65537)
self.assertEqual(expected, key)
def test_save_public_key(self):
"""Test saving public DER keys."""
key = rsa.key.PublicKey(3727264081, 65537)
der = key.save_pkcs1('DER')
self.assertIsInstance(der, bytes)
self.assertEqual(PUBLIC_DER, der)
class PemTest(unittest.TestCase):
"""Test saving and loading PEM keys."""
def test_load_private_key(self):
"""Test loading private PEM files."""
key = rsa.key.PrivateKey.load_pkcs1(PRIVATE_PEM, 'PEM')
expected = rsa.key.PrivateKey(3727264081, 65537, 3349121513, 65063, 57287)
self.assertEqual(expected, key)
self.assertEqual(key.exp1, 55063)
self.assertEqual(key.exp2, 10095)
self.assertEqual(key.coef, 50797)
def test_save_private_key(self):
"""Test saving private PEM files."""
key = rsa.key.PrivateKey(3727264081, 65537, 3349121513, 65063, 57287)
pem = key.save_pkcs1('PEM')
self.assertIsInstance(pem, bytes)
self.assertEqual(CLEAN_PRIVATE_PEM, pem)
def test_load_public_key(self):
"""Test loading public PEM files."""
key = rsa.key.PublicKey.load_pkcs1(PUBLIC_PEM, 'PEM')
expected = rsa.key.PublicKey(3727264081, 65537)
self.assertEqual(expected, key)
def test_save_public_key(self):
"""Test saving public PEM files."""
key = rsa.key.PublicKey(3727264081, 65537)
pem = key.save_pkcs1('PEM')
self.assertIsInstance(pem, bytes)
self.assertEqual(CLEAN_PUBLIC_PEM, pem)
def test_load_from_disk(self):
"""Test loading a PEM file from disk."""
fname = os.path.join(os.path.dirname(__file__), 'private.pem')
with open(fname, mode='rb') as privatefile:
keydata = privatefile.read()
privkey = rsa.key.PrivateKey.load_pkcs1(keydata)
self.assertEqual(15945948582725241569, privkey.p)
self.assertEqual(14617195220284816877, privkey.q)
class PickleTest(unittest.TestCase):
"""Test saving and loading keys by pickling."""
def test_private_key(self):
pk = rsa.key.PrivateKey(3727264081, 65537, 3349121513, 65063, 57287)
pickled = pickle.dumps(pk)
unpickled = pickle.loads(pickled)
self.assertEqual(pk, unpickled)
for attr in rsa.key.AbstractKey.__slots__:
self.assertTrue(hasattr(unpickled, attr))
def test_public_key(self):
pk = rsa.key.PublicKey(3727264081, 65537)
pickled = pickle.dumps(pk)
unpickled = pickle.loads(pickled)
self.assertEqual(pk, unpickled)
for attr in rsa.key.AbstractKey.__slots__:
self.assertTrue(hasattr(unpickled, attr))
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