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60 lines
1.7 KiB
Python
60 lines
1.7 KiB
Python
import os
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import random
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import sys
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import cryptomath_module as cryptoMath
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import rabin_miller as rabinMiller
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def main():
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print("Making key files...")
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makeKeyFiles("rsa", 1024)
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print("Key files generation successful.")
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def generateKey(keySize):
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print("Generating prime p...")
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p = rabinMiller.generateLargePrime(keySize)
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print("Generating prime q...")
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q = rabinMiller.generateLargePrime(keySize)
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n = p * q
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print("Generating e that is relatively prime to (p - 1) * (q - 1)...")
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while True:
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e = random.randrange(2 ** (keySize - 1), 2 ** (keySize))
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if cryptoMath.gcd(e, (p - 1) * (q - 1)) == 1:
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break
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print("Calculating d that is mod inverse of e...")
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d = cryptoMath.findModInverse(e, (p - 1) * (q - 1))
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publicKey = (n, e)
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privateKey = (n, d)
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return (publicKey, privateKey)
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def makeKeyFiles(name, keySize):
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if os.path.exists("%s_pubkey.txt" % (name)) or os.path.exists(
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"%s_privkey.txt" % (name)
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):
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print("\nWARNING:")
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print(
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'"%s_pubkey.txt" or "%s_privkey.txt" already exists. \n'
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"Use a different name or delete these files and re-run this program."
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% (name, name)
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)
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sys.exit()
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publicKey, privateKey = generateKey(keySize)
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print("\nWriting public key to file %s_pubkey.txt..." % name)
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with open("%s_pubkey.txt" % name, "w") as out_file:
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out_file.write("{},{},{}".format(keySize, publicKey[0], publicKey[1]))
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print("Writing private key to file %s_privkey.txt..." % name)
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with open("%s_privkey.txt" % name, "w") as out_file:
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out_file.write("{},{},{}".format(keySize, privateKey[0], privateKey[1]))
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if __name__ == "__main__":
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main()
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