def _check_decryption(self, rsaObj):
plaintext = bytes_to_long(a2b_hex(self.plaintext))
ciphertext = bytes_to_long(a2b_hex(self.ciphertext))
# Test plain decryption
new_plaintext = rsaObj._decrypt(ciphertext)
self.assertEqual(plaintext, new_plaintext)
def _test_signing(self, dsaObj):
k = bytes_to_long(a2b_hex(self.k))
m_hash = bytes_to_long(a2b_hex(self.m_hash))
r = bytes_to_long(a2b_hex(self.r))
s = bytes_to_long(a2b_hex(self.s))
(r_out, s_out) = dsaObj._sign(m_hash, k)
self.assertEqual((r, s), (r_out, s_out))
def _check_encryption(self, rsaObj):
plaintext = a2b_hex(self.plaintext)
ciphertext = a2b_hex(self.ciphertext)
# Test encryption
new_ciphertext2 = rsaObj._encrypt(bytes_to_long(plaintext))
self.assertEqual(bytes_to_long(ciphertext), new_ciphertext2)
def _check_public_key(self, dsaObj):
k = bytes_to_long(a2b_hex(self.k))
m_hash = bytes_to_long(a2b_hex(self.m_hash))
# Check capabilities
self.assertEqual(0, dsaObj.has_private())
self.assertEqual(1, dsaObj.can_sign())
self.assertEqual(0, dsaObj.can_encrypt())
# Check that private parameters are all missing
self.assertEqual(0, hasattr(dsaObj, 'x'))
# Sanity check key data
self.assertEqual(1, dsaObj.p > dsaObj.q) # p > q
self.assertEqual(160, size(dsaObj.q)) # size(q) == 160 bits
self.assertEqual(0, (dsaObj.p - 1) % dsaObj.q) # q is a divisor of p-1
# Public-only key objects should raise an error when .sign() is called
self.assertRaises(TypeError, dsaObj._sign, m_hash, k)
# Check __eq__ and __ne__
self.assertEqual(dsaObj.publickey() == dsaObj.publickey(),
True) # assert_
self.assertEqual(dsaObj.publickey() != dsaObj.publickey(),
False) # failIf
def setUp(self):
global RSA, Random, bytes_to_long
from crypto.PublicKey import RSA
from crypto import Random
from crypto.Util.number import bytes_to_long, inverse
self.n = bytes_to_long(a2b_hex(self.modulus))
self.p = bytes_to_long(a2b_hex(self.prime_factor))
# Compute q, d, and u from n, e, and p
self.q = self.n // self.p
self.d = inverse(self.e, (self.p-1)*(self.q-1))
self.u = inverse(self.p, self.q) # u = e**-1 (mod q)
self.rsa = RSA
def t2b(t):
"""Convert a text string with bytes in hex form to a byte string"""
clean = b(rws(t))
if len(clean) % 2 == 1:
print(clean)
raise ValueError("Even number of characters expected")
return a2b_hex(clean)
def _check_public_key(self, rsaObj):
ciphertext = a2b_hex(self.ciphertext)
# Check capabilities
self.assertEqual(0, rsaObj.has_private())
# Check rsaObj.[ne] -> rsaObj.[ne] mapping
self.assertEqual(rsaObj.n, rsaObj.n)
self.assertEqual(rsaObj.e, rsaObj.e)
# Check that private parameters are all missing
self.assertEqual(0, hasattr(rsaObj, 'd'))
self.assertEqual(0, hasattr(rsaObj, 'p'))
self.assertEqual(0, hasattr(rsaObj, 'q'))
self.assertEqual(0, hasattr(rsaObj, 'u'))
# Sanity check key data
self.assertEqual(1, rsaObj.e > 1) # e > 1
# Public keys should not be able to sign or decrypt
self.assertRaises(TypeError, rsaObj._decrypt,
bytes_to_long(ciphertext))
# Check __eq__ and __ne__
self.assertEqual(rsaObj.publickey() == rsaObj.publickey(),True) # assert_
self.assertEqual(rsaObj.publickey() != rsaObj.publickey(),False) # failIf
def test_construct_4tuple(self):
"""DSA (default implementation) constructed key (4-tuple)"""
(y, g, p, q) = [
bytes_to_long(a2b_hex(param))
for param in (self.y, self.g, self.p, self.q)
]
dsaObj = self.dsa.construct((y, g, p, q))
self._test_verification(dsaObj)
def test_construct_bad_key5(self):
(y, g, p, q, x) = [
bytes_to_long(a2b_hex(param))
for param in (self.y, self.g, self.p, self.q, self.x)
]
tup = (y, g, p, q, x + 1)
self.assertRaises(ValueError, self.dsa.construct, tup)
tup = (y, g, p, q, q + 10)
self.assertRaises(ValueError, self.dsa.construct, tup)
def _exercise_primitive(self, rsaObj):
# Since we're using a randomly-generated key, we can't check the test
# vector, but we can make sure encryption and decryption are inverse
# operations.
ciphertext = bytes_to_long(a2b_hex(self.ciphertext))
# Test decryption
plaintext = rsaObj._decrypt(ciphertext)
# Test encryption (2 arguments)
new_ciphertext2 = rsaObj._encrypt(plaintext)
self.assertEqual(ciphertext, new_ciphertext2)
def convert_tv(self, tv, as_longs=0):
"""Convert a test vector from textual form (hexadecimal ascii
to either integers or byte strings."""
key_comps = 'p', 'g', 'y', 'x'
tv2 = {}
for c in list(tv.keys()):
tv2[c] = a2b_hex(tv[c])
if as_longs or c in key_comps or c in ('sig1', 'sig2'):
tv2[c] = bytes_to_long(tv2[c])
tv2['key'] = []
for c in key_comps:
tv2['key'] += [tv2[c]]
del tv2[c]
return tv2
def _exercise_public_primitive(self, rsaObj):
plaintext = a2b_hex(self.plaintext)
# Test encryption (2 arguments)
new_ciphertext2 = rsaObj._encrypt(bytes_to_long(plaintext))
def _test_verification(self, dsaObj):
m_hash = bytes_to_long(a2b_hex(self.m_hash))
r = bytes_to_long(a2b_hex(self.r))
s = bytes_to_long(a2b_hex(self.s))
self.assertTrue(dsaObj._verify(m_hash, (r, s)))
self.assertFalse(dsaObj._verify(m_hash + 1, (r, s)))
