python-md5-collision/gen_coll_python.py at master · DamnVulnerableCryptoApp/python-md5-collision · GitHub

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#!/usr/bin/env python3

from coll import Collider, md5pad, filter_disallow_binstrings

import os

# We generate a file of the form:

"""

#!/usr/bin/env python2

# -*- coding: utf-8 -*-

diff = '''<one of 2 collision blocks>'''

same = '''<first of the 2 collision blocks>'''

if (same == diff):

print "good"

else:

print "evil"

"""

collider = Collider(blockfilter=filter_disallow_binstrings([b'\0', b"'''"]))

prefix1 = b"""#!/usr/bin/env python2

# -*- coding: utf-8 -*-

#"""

prefix2 = b"""\ndiff = '''"""

# Ensure prefix is a multiple of 64 bytes

prefix = prefix1 + md5pad(prefix1 + prefix2, b' ') + prefix2

# Load the first half of the collision files that opens the 'diff' variable delcaration

collider.bincat(prefix)

# Fill in the 'diff' variable with 2 different blocks that may be chosen

collider.safe_diverge()

postfix = b"""'''

same = '''"""

c1, c2 = collider.get_last_coll()

postfix += c1

postfix += b"""'''

if (same == diff):

print "good"

else:

print "evil"

"""

# Close the 'diff' variable string and declare the 'same' variable to always have the 1st collision block

# Thus for one file: same == diff, but for the other: same != diff

collider.bincat(postfix)

# Write out the good and evil scripts

cols = collider.get_collisions()

GOOD = 'out_py_good.py'

EVIL = 'out_py_evil.py'

with open(GOOD, 'wb') as good:

good.write(next(cols))

with open(EVIL, 'wb') as evil:

evil.write(next(cols))

os.system('chmod +x {} {}'.format(GOOD, EVIL))

python-md5-collision/gen_coll_python.py at master · DamnVulnerableCryptoApp/python-md5-collision · GitHub

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