def generate_triples(self, field, quantity=1, gather=True):
"""Generate *quantity* multiplication triples using PRSS.
These are random numbers *a*, *b*, and *c* such that ``c =
ab``. This function can be used in pre-processing.
Returns a tuple with the number of triples generated and a
Deferred which will yield a singleton-list with a 3-tuple.
"""
# This adjusted to the PRF based on SHA1 (160 bits).
quantity = min(quantity, max(int(160 /numdigits(field.modulus - 1, 2)), 1))
a_t = self.prss_share_random_multi(field, quantity)
b_t = self.prss_share_random_multi(field, quantity)
r_t, r_2t = self.prss_double_share(field, quantity)
c_t = [0] * quantity
for i in range(quantity):
# Multiply a and b without resharing.
c_2t = gather_shares([a_t[i], b_t[i]])
c_2t.addCallback(lambda (a, b): a * b)
d_2t = c_2t - r_2t[i]
d = self.open(d_2t, threshold=2*self.threshold)
c_t[i] = r_t[i] + d
if gather:
return [gatherResults(triple) for triple in zip(a_t, b_t, c_t)]
else:
return zip(a_t, b_t, c_t)
def generate_triples(self, field, quantity=1, gather=True):
"""Generate *quantity* multiplication triples using PRSS.
These are random numbers *a*, *b*, and *c* such that ``c =
ab``. This function can be used in pre-processing.
Returns a tuple with the number of triples generated and a
Deferred which will yield a singleton-list with a 3-tuple.
"""
# This adjusted to the PRF based on SHA1 (160 bits).
quantity = min(quantity,
max(int(160 / numdigits(field.modulus - 1, 2)), 1))
a_t = self.prss_share_random_multi(field, quantity)
b_t = self.prss_share_random_multi(field, quantity)
r_t, r_2t = self.prss_double_share(field, quantity)
c_t = [0] * quantity
for i in range(quantity):
# Multiply a and b without resharing.
c_2t = gather_shares([a_t[i], b_t[i]])
c_2t.addCallback(lambda (a, b): a * b)
d_2t = c_2t - r_2t[i]
d = self.open(d_2t, threshold=2 * self.threshold)
c_t[i] = r_t[i] + d
if gather:
return [gatherResults(triple) for triple in zip(a_t, b_t, c_t)]
else:
return zip(a_t, b_t, c_t)
def rerandomize(self, nworkers=None, use_threads=False, progress=None):
""" Rerandomizes blocks: they will still decrypt to the same
plaintext. """
_progress = None
if progress is not None:
def _progress(n):
progress(float(n) / self.nblocks)
if not nworkers:
nworkers = multiprocessing.cpu_count()
l.debug("Rerandomizing %s blocks on %s workers ...", self.nblocks,
nworkers)
start_time = time.time()
gp = self.group_params
self.data['blocks'] = pol.parallel.parallel_map(
_eg_rerandomize_block,
self.data['blocks'],
args=(gp.g, gp.p),
nworkers=nworkers,
use_threads=use_threads,
initializer=_eg_rerandomize_block_initializer,
chunk_size=16,
progress=_progress)
secs = time.time() - start_time
kbps = self.nblocks * gmpy.numdigits(gp.p, 2) / 1024.0 / 8.0 / secs
if progress is not None:
progress(1.0)
l.debug(" done in %.2fs; that is %.2f KB/s", secs, kbps)
def rerandomize(self, nworkers=None, use_threads=False, progress=None):
""" Rerandomizes blocks: they will still decrypt to the same
plaintext. """
_progress = None
if progress is not None:
def _progress(n):
progress(float(n) / self.nblocks)
if not nworkers:
nworkers = multiprocessing.cpu_count()
l.debug("Rerandomizing %s blocks on %s workers ...", self.nblocks, nworkers)
start_time = time.time()
gp = self.group_params
self.data["blocks"] = pol.parallel.parallel_map(
_eg_rerandomize_block,
self.data["blocks"],
args=(gp.g, gp.p),
nworkers=nworkers,
use_threads=use_threads,
initializer=_eg_rerandomize_block_initializer,
chunk_size=16,
progress=_progress,
)
secs = time.time() - start_time
kbps = self.nblocks * gmpy.numdigits(gp.p, 2) / 1024.0 / 8.0 / secs
if progress is not None:
progress(1.0)
l.debug(" done in %.2fs; that is %.2f KB/s", secs, kbps)
def fibonacci_term_number(length):
'''
Find Fibonacci's term number for number that contains over (length) digits
'''
index = long(1)
#Initial step divisor value
step_div = 1
num = gmpy.mpz(0)
while gmpy.numdigits(num) != length:
golden_ratio = gmpy.mpf(((1 + gmpy.fsqrt(5)) / 2)**gmpy.mpf(index) / gmpy.fsqrt(5))
num = gmpy.mpz(gmpy.fround(golden_ratio, 0))
if gmpy.numdigits(num) < length:
index += length / step_div
#If the previous step was too large, then we go back and reduce it to 2 times
if gmpy.numdigits(num) > length:
index -= length / step_div
step_div *= 2
return index
def __init__(self, key, max):
"""Create a PRF keyed with the given key and max.
The key must be a string whereas the max must be a number.
Output value will be in the range zero to max, with zero
included and max excluded.
To make a PRF what generates numbers less than 1000 do:
>>> f = PRF("key", 1000)
The PRF can be evaluated by calling it on some input:
>>> f("input")
327L
Creating another PRF with the same key gives identical results
since f and g are deterministic functions, depending only on
the key:
>>> g = PRF("key", 1000)
>>> g("input")
327L
We can test that f and g behave the same on many inputs:
>>> [f(i) for i in range(100)] == [g(i) for i in range(100)]
True
Both the key and the max is used when the PRF is keyed. This
means that
>>> f = PRF("key", 1000)
>>> g = PRF("key", 10000)
>>> [f(i) for i in range(100)] == [g(i) for i in range(100)]
False
"""
self.max = max
# Number of bits needed for a number in the range [0, max-1].
bit_length = numdigits(max - 1, 2)
# Number of whole digest blocks needed.
blocks = int(ceil(bit_length / 8.0 / sha1().digest_size))
# Number of whole bytes needed.
self.bytes = int(ceil(bit_length / 8.0))
# Number of bits needed from the final byte.
self.bits = bit_length % 8
self.sha1s = []
for i in range(blocks):
# TODO: this construction is completely ad-hoc and not
# known to be secure...
# Initial seed is key + str(max). The maximum is included
# since we want PRF("input", 100) and PRF("input", 1000)
# to generate different output.
seed = key + str(max)
# The i'th generator is seeded with H^i(key + str(max))
# where H^i means repeated hashing i times.
for _ in range(i):
seed = sha1(seed).digest()
self.sha1s.append(sha1(seed))
def __init__(self, key, max):
"""Create a PRF keyed with the given key and max.
The key must be a string whereas the max must be a number.
Output value will be in the range zero to max, with zero
included and max excluded.
To make a PRF what generates numbers less than 1000 do:
>>> f = PRF("key", 1000)
The PRF can be evaluated by calling it on some input:
>>> f("input")
327L
Creating another PRF with the same key gives identical results
since f and g are deterministic functions, depending only on
the key:
>>> g = PRF("key", 1000)
>>> g("input")
327L
We can test that f and g behave the same on many inputs:
>>> [f(i) for i in range(100)] == [g(i) for i in range(100)]
True
Both the key and the max is used when the PRF is keyed. This
means that
>>> f = PRF("key", 1000)
>>> g = PRF("key", 10000)
>>> [f(i) for i in range(100)] == [g(i) for i in range(100)]
False
"""
self.max = max
# Number of bits needed for a number in the range [0, max-1].
bit_length = numdigits(max-1, 2)
# Number of whole digest blocks needed.
blocks = int(ceil(bit_length / 8.0 / sha.digest_size))
# Number of whole bytes needed.
self.bytes = int(ceil(bit_length / 8.0))
# Number of bits needed from the final byte.
self.bits = bit_length % 8
self.sha1s = []
for i in range(blocks):
# TODO: this construction is completely ad-hoc and not
# known to be secure...
# Initial seed is key + str(max). The maximum is included
# since we want PRF("input", 100) and PRF("input", 1000)
# to generate different output.
seed = key + str(max)
# The i'th generator is seeded with H^i(key + str(max))
# where H^i means repeated hashing i times.
for _ in range(i):
seed = sha.new(seed).digest()
self.sha1s.append(sha.new(seed))
if __name__ == '__main__':
try:
import gmpy
except ImportError:
pass
else:
ints = range(400)
for n in ints:
try:
assert gmpy.digits(n, 2) == digits(n)
except AssertionError:
print 'digits fail %d' % n
raise
try:
assert gmpy.numdigits(n, 2) == numdigits(n)
except AssertionError:
print 'numdigits fail %d' % n
raise
try:
assert gmpy.popcount(n) == popcount(n)
except AssertionError:
print 'popcount fail %d' % n
raise
for n in list(ints):
for i in ints:
try:
assert gmpy.getbit(n, i) == getbit(n, i)
except AssertionError:
print 'getbit fail %d, %d' % (n, i)
raise
gmp_initial_time += 1
def calculate_division(test, n):
# print n
# print 'number of digits in test is {} in base 2'.format(_g.numdigits(test,2))
# print 'number of digits in n is {} in base 2'.format(_g.numdigits(n,2))
prime = _g.next_prime(test)
# print prime
if _g.is_prime(prime):
# print 'I got a prime {}'.format(prime)
if n % prime == 0:
print n
print 'success'
# print prime
# print 'hello'
a = _g.mpz(3)
b = _g.mpz(4)
a * b
n = _g.mpz(
24273618023607084486640780738570808771621986433484759110890007663285083070301411494342166417501975875434396254572210883097197606002792961188765714012586572973883316624919480269976588918378510060114863169458998238884707186422078503198409711517331925718724992482313607561083572145615542689766892477475245783591560768105522701218201319805109927490758320089753382216289985913622881684008449778824296369632718648732093073866955919245262132806601747308245712568619870175403589653143883582535983611659536338442969098602432733731978529775504102960957720743400991276136582059048290901573859913873714239909117158697715526500669
)
digits = _g.numdigits(n, 2)
print 'number of digits in n is {}'.format(digits)
# print n
# calculate_seconds()
calculate_seed(n)
# print rvalue
gmp_initial_ppid += 1
gmp_initial_pid += 1
# print gmp_initial_time
gmp_initial_time += 1
def calculate_division(test, n):
# print n
# print 'number of digits in test is {} in base 2'.format(_g.numdigits(test,2))
# print 'number of digits in n is {} in base 2'.format(_g.numdigits(n,2))
prime = _g.next_prime(test)
# print prime
if _g.is_prime(prime):
# print 'I got a prime {}'.format(prime)
if n % prime == 0:
print n
print 'success'
# print prime
# print 'hello'
a = _g.mpz(3)
b = _g.mpz(4)
a * b
n = _g.mpz(24273618023607084486640780738570808771621986433484759110890007663285083070301411494342166417501975875434396254572210883097197606002792961188765714012586572973883316624919480269976588918378510060114863169458998238884707186422078503198409711517331925718724992482313607561083572145615542689766892477475245783591560768105522701218201319805109927490758320089753382216289985913622881684008449778824296369632718648732093073866955919245262132806601747308245712568619870175403589653143883582535983611659536338442969098602432733731978529775504102960957720743400991276136582059048290901573859913873714239909117158697715526500669)
digits = _g.numdigits(n,2)
print 'number of digits in n is {}'.format(digits)
# print n
# calculate_seconds()
calculate_seed(n)
