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sha256_gc.py
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sha256_gc.py
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# SHA256 with Garbled Circuit
# python 3.7.4
# encoding=utf-8
import os
import sys
import string
import random
from garbled_circuit import garbled_circuit
class sha256:
# initial
def __init__(self, plaintext):
self._h = list() # data block of variables h[0] .. h[7]
self._k = list() # data block of constants k[0] .. k[63]
self._pathtext = ["ch", "ma", "s00", "s01", "s10", "s11"]
self._circuit = dict()
self._input_wire = dict()
self._output_wire = dict()
self.message = list()
self.genTime = 0
self.decTime = 0
self.text_to_bits(plaintext)
# load constant data block
if os.path.isfile("sha256_h") and os.path.isfile("sha256_k"):
self.read_h()
self.read_k()
self.read_circuit()
self.pre_process()
self.process()
else:
print("sha256_h & sha256_k not found")
exit(0)
print("Generate garbled circuit: ", self.genTime)
print("Drcrypt garbled circuit: ", self.decTime)
# pre-processing
def pre_process(self):
length = len(self.message)
self.message += "1"
while len(self.message) % 512 != 448:
self.message += "0"
self.message += "{0:064b}".format(length)
# print(len(self.message))
# process the message in successive 512-bit chunks
def process(self):
chunks = [self.message[i:i + 512] for i in range(0, len(self.message), 512)]
for chunk in chunks:
w = self.extend(chunk)
al = self._h.copy()
self.main_loop(w, al)
for i in range(0, 8):
self._h[i] = format(int(self._h[i], 2) + int(al[i], 2), "032b")
while len(self._h[i]) > 32:
self._h[i] = self._h[i][1:]
# extend the sixteen 32-bit words into sixty-four 32-bit words
def extend(self, chunk):
w = []
for i in range(0, len(chunk), 32):
w_ = chunk[i:i + 32]
w.append(w_)
for i in range(16, 64):
s0 = self._sigma("s10", w[i - 15])
s1 = self._sigma("s11", w[i - 2])
w_ = format(int(w[i - 16], 2) + int(s0, 2) + \
int(w[i - 7], 2) + int(s1, 2), "032b")
while len(w_) > 32:
w_ = w_[1:]
w.append(w_)
return w
# process main loop
def main_loop(self, w, al):
for i in range(0, 64):
s0 = self._sigma("s00", al[0])
ma = self._mach("ma", al[0], al[1], al[2])
t2 = format(int(s0, 2) + int(ma, 2), "032b")
while len(t2) > 32:
t2 = t2[1:]
s1 = self._sigma("s01", al[4])
ch = self._mach("ch", al[4], al[5], al[6])
t1 = format(int(al[7], 2) + int(s1, 2) + int(ch, 2) + \
int(self._k[i], 2) + int(w[i], 2), "032b")
while len(t1) > 32:
t1 = t1[1:]
al.pop()
al.insert(0, format(int(t1, 2) + int(t2, 2), "032b"))
al[4] = format(int(al[4], 2) + int(t1, 2), "032b")
while len(al[4]) > 32:
al[4] = al[4][1:]
while len(al[0]) > 32:
al[0] = al[0][1:]
# Sigma
def _sigma(self, tag, x):
gc = garbled_circuit(x, self._input_wire[tag], self._output_wire[tag], self._circuit[tag])
gc.update()
ans = gc.ans
self.genTime += gc.genTime
self.decTime += gc.decTime
s = ""
for i in range(0, 32):
s += str(ans["o_" + str(i)])
return s
# Ma、Ch
def _mach(self, tag, a, b, c):
gc = garbled_circuit(a + b + c, self._input_wire[tag], self._output_wire[tag], self._circuit[tag])
gc.update()
ans = gc.ans
self.genTime += gc.genTime
self.decTime += gc.decTime
s = ""
for i in range(0, 32):
s += str(ans["o_" + str(i)])
return s
# produce the final hash value
# transform binary to heximal
def hexdigest(self):
bits = "".join(l for l in self._h)
return "{0:0{1}x}".format(int(bits, 2), 64)
# load variables from file
def read_h(self):
f = open("sha256_h", "r")
if f.mode == "r":
lines = f.readlines()
for line in lines:
self._h.append(format(int(line, 16), "032b"))
# print(self._h)
f.close()
# load constants from file
def read_k(self):
f = open("sha256_k", "r")
if f.mode == "r":
lines = f.readlines()
for line in lines:
line_ = line.split()
for l in line_:
self._k.append(format(int(l, 16), "032b"))
# print(self._k)
f.close()
# load circuit
def read_circuit(self):
for pathname in self._pathtext:
circuit = []
if os.path.isfile("circuit/" + pathname):
f = open("circuit/" + pathname, "r")
if f.mode == "r":
lines = f.readlines()
self._input_wire[pathname] = lines.pop(0).split()
self._output_wire[pathname] = lines.pop(0).split()
for line in lines:
circuit.append(line)
self._circuit[pathname] = circuit
f.close()
# transform text to binary
def text_to_bits(self, text, encoding="utf-8", errors="surrogatepass"):
bits = bin(int.from_bytes(text.encode(encoding, errors), "big"))[2:]
self.message = bits.zfill(8 * ((len(bits) + 7) // 8))
def main():
if len(sys.argv) == 1:
plaintext = "".join(random.choices(string.ascii_uppercase + string.digits + string.ascii_lowercase, k=32))
print("RANDOM STRING: " + plaintext)
else:
plaintext = sys.argv[1]
print("INPUT STRING: " + plaintext)
sha256_gc = sha256(plaintext)
print(sha256_gc.hexdigest())
if __name__ == "__main__":
main()