# -*- coding: utf-8 -*-
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#
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# Copyright 2011 Sybren A. Stüvel <sybren@stuvel.eu>
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# https://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Tests string operations."""
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import struct
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import unittest
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import rsa
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from rsa import pkcs1
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from rsa._compat import byte, is_bytes
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class BinaryTest(unittest.TestCase):
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def setUp(self):
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(self.pub, self.priv) = rsa.newkeys(256)
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def test_enc_dec(self):
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message = struct.pack('>IIII', 0, 0, 0, 1)
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print("\tMessage: %r" % message)
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encrypted = pkcs1.encrypt(message, self.pub)
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print("\tEncrypted: %r" % encrypted)
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decrypted = pkcs1.decrypt(encrypted, self.priv)
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print("\tDecrypted: %r" % decrypted)
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self.assertEqual(message, decrypted)
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def test_decoding_failure(self):
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message = struct.pack('>IIII', 0, 0, 0, 1)
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encrypted = pkcs1.encrypt(message, self.pub)
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# Alter the encrypted stream
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a = encrypted[5]
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if is_bytes(a):
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a = ord(a)
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altered_a = (a + 1) % 256
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encrypted = encrypted[:5] + byte(altered_a) + encrypted[6:]
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self.assertRaises(pkcs1.DecryptionError, pkcs1.decrypt, encrypted,
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self.priv)
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def test_randomness(self):
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"""Encrypting the same message twice should result in different
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cryptos.
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"""
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message = struct.pack('>IIII', 0, 0, 0, 1)
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encrypted1 = pkcs1.encrypt(message, self.pub)
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encrypted2 = pkcs1.encrypt(message, self.pub)
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self.assertNotEqual(encrypted1, encrypted2)
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class SignatureTest(unittest.TestCase):
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def setUp(self):
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(self.pub, self.priv) = rsa.newkeys(512)
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def test_sign_verify(self):
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"""Test happy flow of sign and verify"""
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message = b'je moeder'
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signature = pkcs1.sign(message, self.priv, 'SHA-256')
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self.assertEqual('SHA-256', pkcs1.verify(message, signature, self.pub))
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def test_find_signature_hash(self):
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"""Test happy flow of sign and find_signature_hash"""
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message = b'je moeder'
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signature = pkcs1.sign(message, self.priv, 'SHA-256')
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self.assertEqual('SHA-256', pkcs1.find_signature_hash(signature, self.pub))
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def test_alter_message(self):
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"""Altering the message should let the verification fail."""
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signature = pkcs1.sign(b'je moeder', self.priv, 'SHA-256')
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self.assertRaises(pkcs1.VerificationError, pkcs1.verify,
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b'mijn moeder', signature, self.pub)
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def test_sign_different_key(self):
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"""Signing with another key should let the verification fail."""
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(otherpub, _) = rsa.newkeys(512)
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message = b'je moeder'
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signature = pkcs1.sign(message, self.priv, 'SHA-256')
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self.assertRaises(pkcs1.VerificationError, pkcs1.verify,
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message, signature, otherpub)
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def test_multiple_signings(self):
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"""Signing the same message twice should return the same signatures."""
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message = struct.pack('>IIII', 0, 0, 0, 1)
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signature1 = pkcs1.sign(message, self.priv, 'SHA-1')
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signature2 = pkcs1.sign(message, self.priv, 'SHA-1')
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self.assertEqual(signature1, signature2)
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def test_split_hash_sign(self):
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"""Hashing and then signing should match with directly signing the message. """
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message = b'je moeder'
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msg_hash = pkcs1.compute_hash(message, 'SHA-256')
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signature1 = pkcs1.sign_hash(msg_hash, self.priv, 'SHA-256')
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# Calculate the signature using the unified method
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signature2 = pkcs1.sign(message, self.priv, 'SHA-256')
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self.assertEqual(signature1, signature2)
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def test_hash_sign_verify(self):
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"""Test happy flow of hash, sign, and verify"""
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message = b'je moeder'
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msg_hash = pkcs1.compute_hash(message, 'SHA-224')
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signature = pkcs1.sign_hash(msg_hash, self.priv, 'SHA-224')
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self.assertTrue(pkcs1.verify(message, signature, self.pub))
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