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'''Tests string operations.'''
import struct
import unittest2
import rsa
from rsa import pkcs1
class BinaryTest(unittest2.TestCase):
def setUp(self):
(self.pub, self.priv) = rsa.newkeys(256)
def test_enc_dec(self):
message = struct.pack('>IIII', 0, 0, 0, 1)
print("\tMessage: %r" % message)
encrypted = pkcs1.encrypt(message, self.pub)
print("\tEncrypted: %r" % encrypted)
decrypted = pkcs1.decrypt(encrypted, self.priv)
print("\tDecrypted: %r" % decrypted)
self.assertEqual(message, decrypted)
def test_decoding_failure(self):
message = struct.pack('>IIII', 0, 0, 0, 1)
encrypted = pkcs1.encrypt(message, self.pub)
# Alter the encrypted stream
encrypted = encrypted[:5] + chr(ord(encrypted[5]) + 1) + encrypted[6:]
self.assertRaises(pkcs1.DecryptionError, pkcs1.decrypt, encrypted,
self.priv)
def test_randomness(self):
'''Encrypting the same message twice should result in different
cryptos.
'''
message = struct.pack('>IIII', 0, 0, 0, 1)
encrypted1 = pkcs1.encrypt(message, self.pub)
encrypted2 = pkcs1.encrypt(message, self.pub)
self.assertNotEqual(encrypted1, encrypted2)
class SignatureTest(unittest2.TestCase):
def setUp(self):
(self.pub, self.priv) = rsa.newkeys(512)
def test_sign_verify(self):
'''Test happy flow of sign and verify'''
message = 'je moeder'
print("\tMessage: %r" % message)
signature = pkcs1.sign(message, self.priv, 'SHA-256')
print("\tSignature: %r" % signature)
pkcs1.verify(message, signature, self.pub)
def test_alter_message(self):
'''Altering the message should let the verification fail.'''
signature = pkcs1.sign('je moeder', self.priv, 'SHA-256')
self.assertRaises(pkcs1.VerificationError, pkcs1.verify,
'mijn moeder', signature, self.pub)
def test_sign_different_key(self):
'''Signing with another key should let the verification fail.'''
(otherpub, _) = rsa.newkeys(512)
message = 'je moeder'
signature = pkcs1.sign(message, self.priv, 'SHA-256')
self.assertRaises(pkcs1.VerificationError, pkcs1.verify,
message, signature, otherpub)
def test_multiple_signings(self):
'''Signing the same message twice should return the same signatures.'''
message = struct.pack('>IIII', 0, 0, 0, 1)
signature1 = pkcs1.sign(message, self.priv, 'SHA-1')
signature2 = pkcs1.sign(message, self.priv, 'SHA-1')
self.assertEqual(signature1, signature2)
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