def _pseudo_random_data(self, bytes):
if not 0 <= bytes <= self.max_bytes_per_request:
raise AssertionError(
'You cannot ask for more than 1 MiB of data per request')
num_blocks = ceil_shift(bytes, self.block_size_shift)
retval = self._generate_blocks(num_blocks)[:bytes]
self._set_key(self._generate_blocks(self.blocks_per_key))
return retval
def _pseudo_random_data(self, bytes):
if not 0 <= bytes <= self.max_bytes_per_request:
raise AssertionError('You cannot ask for more than 1 MiB of data per request')
num_blocks = ceil_shift(bytes, self.block_size_shift)
retval = self._generate_blocks(num_blocks)[:bytes]
self._set_key(self._generate_blocks(self.blocks_per_key))
assert len(retval) == bytes
assert len(self.key) == self.key_size
return retval
def do_encrypt(message, keyname='key_0x8d2bc.pem'): key = RSA.importKey(open(keyname).read()) #see PKCS1_v1_5.py > verify() k = ceil_shift(key.size(), 3) if len(message) != k: print "key length does not match!" return "" m = key.encrypt(message, 0)[0] return m
def do_encrypt_hash(h, signature, keyname='pub.der'): key = RSA.importKey(open(keyname).read()) #see PKCS1_v1_5.py > verify() k = ceil_shift(key.size(), 3) if len(signature) != k: print "key length does not match!" return False m = key.encrypt(signature, 0)[0] print "deciphered signature: %s" % binascii.hexlify(m) return False
def _pseudo_random_data(self, bytes):
if not (0 <= bytes <= self.max_bytes_per_request):
raise AssertionError("You cannot ask for more than 1 MiB of data per request")
num_blocks = ceil_shift(bytes, self.block_size_shift) # num_blocks = ceil(bytes / self.block_size)
# Compute the output
retval = self._generate_blocks(num_blocks)[:bytes]
# Switch to a new key to avoid later compromises of this output (i.e.
# state compromise extension attacks)
self._set_key(self._generate_blocks(self.blocks_per_key))
assert len(retval) == bytes
assert len(self.key) == self.key_size
return retval
def _pseudo_random_data(self, bytes):
if not (0 <= bytes <= self.max_bytes_per_request):
raise AssertionError("You cannot ask for more than 1 MiB of data per request")
num_blocks = ceil_shift(bytes, self.block_size_shift) # num_blocks = ceil(bytes / self.block_size)
# Compute the output
retval = self._generate_blocks(num_blocks)[:bytes]
# Switch to a new key to avoid later compromises of this output (i.e.
# state compromise extension attacks)
self._set_key(self._generate_blocks(self.blocks_per_key))
assert len(retval) == bytes
assert len(self.key) == self.key_size
return retval
def test_ceil_shift(self):
"""Util.number.ceil_shift"""
self.assertRaises(AssertionError, number.ceil_shift, -1, 1)
self.assertRaises(AssertionError, number.ceil_shift, 1, -1)
# b = 0
self.assertEqual(0, number.ceil_shift(0, 0))
self.assertEqual(1, number.ceil_shift(1, 0))
self.assertEqual(2, number.ceil_shift(2, 0))
self.assertEqual(3, number.ceil_shift(3, 0))
# b = 1
self.assertEqual(0, number.ceil_shift(0, 1))
self.assertEqual(1, number.ceil_shift(1, 1))
self.assertEqual(1, number.ceil_shift(2, 1))
self.assertEqual(2, number.ceil_shift(3, 1))
# b = 2
self.assertEqual(0, number.ceil_shift(0, 2))
self.assertEqual(1, number.ceil_shift(1, 2))
self.assertEqual(1, number.ceil_shift(2, 2))
self.assertEqual(1, number.ceil_shift(3, 2))
self.assertEqual(1, number.ceil_shift(4, 2))
self.assertEqual(2, number.ceil_shift(5, 2))
self.assertEqual(2, number.ceil_shift(6, 2))
self.assertEqual(2, number.ceil_shift(7, 2))
self.assertEqual(2, number.ceil_shift(8, 2))
self.assertEqual(3, number.ceil_shift(9, 2))
for b in range(3, 1 + 129, 3): # 3, 6, ... , 129
self.assertEqual(0, number.ceil_shift(0, b))
n = 1
while n <= 2**(b + 2):
(q, r) = divmod(n - 1, 2**b)
expected = q + int(not not r)
self.assertEqual((n - 1, b, expected),
(n - 1, b, number.ceil_shift(n - 1, b)))
(q, r) = divmod(n, 2**b)
expected = q + int(not not r)
self.assertEqual((n, b, expected),
(n, b, number.ceil_shift(n, b)))
(q, r) = divmod(n + 1, 2**b)
expected = q + int(not not r)
self.assertEqual((n + 1, b, expected),
(n + 1, b, number.ceil_shift(n + 1, b)))
n *= 2
def test_ceil_shift(self):
"""Util.number.ceil_shift"""
self.assertRaises(AssertionError, number.ceil_shift, -1, 1)
self.assertRaises(AssertionError, number.ceil_shift, 1, -1)
# b = 0
self.assertEqual(0, number.ceil_shift(0, 0))
self.assertEqual(1, number.ceil_shift(1, 0))
self.assertEqual(2, number.ceil_shift(2, 0))
self.assertEqual(3, number.ceil_shift(3, 0))
# b = 1
self.assertEqual(0, number.ceil_shift(0, 1))
self.assertEqual(1, number.ceil_shift(1, 1))
self.assertEqual(1, number.ceil_shift(2, 1))
self.assertEqual(2, number.ceil_shift(3, 1))
# b = 2
self.assertEqual(0, number.ceil_shift(0, 2))
self.assertEqual(1, number.ceil_shift(1, 2))
self.assertEqual(1, number.ceil_shift(2, 2))
self.assertEqual(1, number.ceil_shift(3, 2))
self.assertEqual(1, number.ceil_shift(4, 2))
self.assertEqual(2, number.ceil_shift(5, 2))
self.assertEqual(2, number.ceil_shift(6, 2))
self.assertEqual(2, number.ceil_shift(7, 2))
self.assertEqual(2, number.ceil_shift(8, 2))
self.assertEqual(3, number.ceil_shift(9, 2))
for b in range(3, 1+129, 3): # 3, 6, ... , 129
self.assertEqual(0, number.ceil_shift(0, b))
n = 1L
while n <= 2L**(b+2):
(q, r) = divmod(n-1, 2L**b)
expected = q + int(not not r)
self.assertEqual((n-1, b, expected),
(n-1, b, number.ceil_shift(n-1, b)))
(q, r) = divmod(n, 2L**b)
expected = q + int(not not r)
self.assertEqual((n, b, expected),
(n, b, number.ceil_shift(n, b)))
(q, r) = divmod(n+1, 2L**b)
expected = q + int(not not r)
self.assertEqual((n+1, b, expected),
(n+1, b, number.ceil_shift(n+1, b)))
n *= 2
