Last active
December 19, 2015 19:10
-
-
Save fleder/ba27b6d0d142b542a18f to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
from boolector import Boolector | |
if __name__ == "__main__": | |
b = Boolector() | |
b.Set_opt("model_gen", 1) | |
input_bytes = 13 | |
input_bits = 8*input_bytes #10 bytes of input | |
input = b.Var(input_bits, "input") | |
#hash = b.Const(446055857, 32) | |
mask = b.Const(0x04C11DB7, 32) | |
hash = b.Const(0, 32) #+ | |
#hash = b.Const(1802000166, 32) #++ | |
#hash = b.Const(1408200592, 32) #++<> | |
for i in range(0,input_bits/8): | |
o = i * 8 | |
#all input bytes are from "+-><; " | |
cur = b.Slice(input,o+7, o) | |
b.Assert( (cur == 43) | (cur == 45) | (cur ==60) | (cur == 62) | (cur == 59) | (cur == 20) ) | |
for i in range (0,input_bits): | |
hashnew = b.Var(32,"hash"+str(i)) | |
# hash = if inptu[i] then hash+136... else hash*308.. end | |
#b.Assert( hashnew == b.Cond(input[input_bits-i-1], hash + 1364396257, hash*3084817850 ) ) | |
""" | |
b.Assert( hashnew == b.Cond(input[input_bits-i-1] == hash[31], | |
b.Sll(hash, 1), | |
b.Xor( b.Sll(hash, 1), mask) | |
) ) | |
""" | |
b.Assert( hashnew == b.Cond(input[input_bits-i-1] == hash[31], | |
(hash << 1) & 0xffffffff, | |
((hash << 1) ^ mask) & 0xffffffff | |
) ) | |
hash = hashnew | |
#b.Assert( hash == 3009969537) #+ | |
#b.Assert( hash == 1408200592) #++<> | |
b.Assert( hash == 0) | |
#b.Assert( input == 43 ) | |
""" | |
for i in range (0,input_bits): | |
hashnew = b.Var(32,"hash"+str(i)) | |
# hash = if inptu[i] then hash+136... else hash*308.. end | |
b.Assert( hashnew == b.Cond(input[input_bits-i-1], hash + 1364396257, hash*3084817850 ) ) | |
hash = hashnew | |
for i in range(0,input_bits/8): | |
o = i * 8 | |
#all input bytes are from A..Z | |
cur = b.Slice(input,o+7, o) | |
b.Assert( cur >= 65) | |
b.Assert( cur <= 90) | |
b.Assert( hash == 2870426180) | |
""" | |
#import pdb; pdb.set_trace() | |
res = b.Sat() | |
if res == b.SAT: | |
b.Print_model() | |
print("{} {:x}".format(input.symbol, int(input.assignment,2))) | |
hx = "{:x}".format(int(input.assignment,2)) | |
print(hx, type(hx)) | |
print hx.decode('hex') | |
else: | |
print("unsat") |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment