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break_rsa.py
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break_rsa.py
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#!/usr/bin/python3
#
#Breaking (weak) RSA
#Adam Duby, aduby@uccs.edu
#UC Lions, UCCS
from Crypto.PublicKey import RSA
from sympy import mod_inverse
from sympy import factorint
import sys
def get_d(e, n):
factors = factorint(n, multiple=True)
p = factors[0];
q = factors[1];
print("p = ", int(p))
print("q = ", int(q))
phi = int((int(p)-1)*(int(q)-1))
print("phi = ", int(phi))
return mod_inverse(e, int(phi))
def read_from_pem(filename):
fd = open(filename, 'r')
key = RSA.importKey(fd.read())
fd.close()
return get_d(key.e, key.n)
def printUsage():
print("\nUsage:\n\tbreak_rsa.py [public.pem]")
print("\n\t\tOR")
print("\n\tbreak_rsa.py [e] [n]\n")
def main(argv):
if (len(sys.argv) == 2):
d = read_from_pem(argv[0])
elif (len(sys.argv) == 3):
d = get_d(int(argv[0]), int(argv[1]))
else:
printUsage()
sys.exit()
print('d = ', int(d))
if __name__ == "__main__":
main(sys.argv[1:])