def test_size(self):
self.assertEqual(number.size(2),2)
self.assertEqual(number.size(3),2)
self.assertEqual(number.size(0xa2),8)
self.assertEqual(number.size(0xa2ba40),8*3)
self.assertEqual(number.size(0xa2ba40ee07e3b2bd2f02ce227f36a195024486e49c19cb41bbbdfbba98b22b0e577c2eeaffa20d883a76e65e394c69d4b3c05a1e8fadda27edb2a42bc000fe888b9b32c22d15add0cd76b3e7936e19955b220dd17d4ea904b1ec102b2e4de7751222aa99151024c7cb41cc5ea21d00eeb41f7c800834d2c6e06bce3bce7ea9a5), 1024)
self.assertRaises(ValueError, number.size, -1)
def randrange(self, *args):
"""randrange([start,] stop[, step]):
Return a randomly-selected element from range(start, stop, step)."""
if len(args) == 3:
(start, stop, step) = args
elif len(args) == 2:
(start, stop) = args
step = 1
elif len(args) == 1:
(stop,) = args
start = 0
step = 1
else:
raise TypeError("randrange expected at most 3 arguments, got %d" % (len(args),))
if (not isinstance(start, (int, long))
or not isinstance(stop, (int, long))
or not isinstance(step, (int, long))):
raise TypeError("randrange requires integer arguments")
if step == 0:
raise ValueError("randrange step argument must not be zero")
num_choices = ceil_div(stop - start, step)
if num_choices < 0:
num_choices = 0
if num_choices < 1:
raise ValueError("empty range for randrange(%r, %r, %r)" % (start, stop, step))
# Pick a random number in the range of possible numbers
r = num_choices
while r >= num_choices:
r = self.getrandbits(size(num_choices))
return start + (step * r)
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 randrange(self, *args):
"""randrange([start,] stop[, step]):
Return a randomly-selected element from range(start, stop, step)."""
if len(args) == 3:
(start, stop, step) = args
elif len(args) == 2:
(start, stop) = args
step = 1
elif len(args) == 1:
(stop,) = args
start = 0
step = 1
else:
raise TypeError("randrange expected at most 3 arguments, got %d" % (len(args),))
if (not isinstance(start, (int, long))
or not isinstance(stop, (int, long))
or not isinstance(step, (int, long))):
raise TypeError("randrange requires integer arguments")
if step == 0:
raise ValueError("randrange step argument must not be zero")
num_choices = ceil_div(stop - start, step)
if num_choices < 0:
num_choices = 0
if num_choices < 1:
raise ValueError("empty range for randrange(%r, %r, %r)" % (start, stop, step))
# Pick a random number in the range of possible numbers
r = num_choices
while r >= num_choices:
r = self.getrandbits(size(num_choices))
return start + (step * r)
def _encrypt(key, message):
mod_bits = size(key.n)
k = ceil_div(mod_bits, 8)
m_len = len(message)
# Step 1
if m_len > k - 11:
raise ValueError("Plaintext is too long.")
# Step 2a
ps = []
while len(ps) != k - m_len - 3:
new_byte = bchr(0xFF)
if bord(new_byte[0]) == 0x00:
continue
ps.append(new_byte)
ps = b("").join(ps)
assert (len(ps) == k - m_len - 3)
# Step 2b
em = b('\x00\x01') + ps + bchr(0x00) + message
# Step 3a (OS2IP)
em_int = bytes_to_long(em)
# Step 3b (RSAEP)
if not 0 < em_int < key._n:
raise ValueError("Plaintext too large")
m_int = int(pow(Integer(em_int), key._d, key._n))
# Step 3c (I2OSP)
c = long_to_bytes(m_int, k)
return c
def _check_private_key(self, dsaObj):
# Check capabilities
self.assertEqual(1, dsaObj.has_private())
self.assertEqual(1, dsaObj.can_sign())
self.assertEqual(0, dsaObj.can_encrypt())
# 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
self.assertEqual(dsaObj.y, pow(dsaObj.g, dsaObj.x, dsaObj.p)) # y == g**x mod p
self.assertEqual(1, 0 < dsaObj.x < dsaObj.q) # 0 < x < q
def _decrypt(key, ciphertext):
modBits = size(key.n)
k = ceil_div(modBits, 8) # Convert from bits to bytes
# Step 1
if len(ciphertext) != k:
raise ValueError("Ciphertext with incorrect length.")
# Step 2a (O2SIP)
ct_int = bytes_to_long(bstr(ciphertext))
# Step 2b (RSADP)
m_int = pow(Integer(ct_int), key._e, key._n)
# Complete step 2c (I2OSP)
em = long_to_bytes(m_int, k)
# Step 3
sep = em.find(bchr(0x00), 2)
# Step 4
return em[sep + 1:]
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 test_size(self):
self.assertEqual(number.size(2),2)
self.assertEqual(number.size(3),2)
self.assertEqual(number.size(0xa2),8)
self.assertEqual(number.size(0xa2ba40),8*3)
self.assertEqual(number.size(0xa2ba40ee07e3b2bd2f02ce227f36a195024486e49c19cb41bbbdfbba98b22b0e577c2eeaffa20d883a76e65e394c69d4b3c05a1e8fadda27edb2a42bc000fe888b9b32c22d15add0cd76b3e7936e19955b220dd17d4ea904b1ec102b2e4de7751222aa99151024c7cb41cc5ea21d00eeb41f7c800834d2c6e06bce3bce7ea9a5L), 1024)