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import random, sys, os

import rabin_miller as rabinMiller, cryptomath_module as cryptoMath

def main():

print("Making key files...")

makeKeyFiles("rsa", 1024)

print("Key files generation successful.")

def generateKey(keySize):

print("Generating prime p...")

p = rabinMiller.generateLargePrime(keySize)

print("Generating prime q...")

q = rabinMiller.generateLargePrime(keySize)

n = p * q

print("Generating e that is relatively prime to (p - 1) * (q - 1)...")

while True:

e = random.randrange(2 ** (keySize - 1), 2 ** (keySize))

if cryptoMath.gcd(e, (p - 1) * (q - 1)) == 1:

break

print("Calculating d that is mod inverse of e...")

d = cryptoMath.findModInverse(e, (p - 1) * (q - 1))

publicKey = (n, e)

privateKey = (n, d)

return (publicKey, privateKey)

def makeKeyFiles(name, keySize):

if os.path.exists("%s_pubkey.txt" % (name)) or os.path.exists(

"%s_privkey.txt" % (name)

print("\nWARNING:")

print(

'"%s_pubkey.txt" or "%s_privkey.txt" already exists. \nUse a different name or delete these files and re-run this program.'

% (name, name)

)

sys.exit()

publicKey, privateKey = generateKey(keySize)

print("\nWriting public key to file %s_pubkey.txt..." % name)

with open("%s_pubkey.txt" % name, "w") as fo:

fo.write("{},{},{}".format(keySize, publicKey[0], publicKey[1]))

print("Writing private key to file %s_privkey.txt..." % name)

with open("%s_privkey.txt" % name, "w") as fo:

fo.write("{},{},{}".format(keySize, privateKey[0], privateKey[1]))

if __name__ == "__main__":

main()

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