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ciphers/rsa_key_generator.py

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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('%s,%s,%s' % (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('%s,%s,%s' % (keySize, privateKey[0], privateKey[1]))
+
+if __name__ == '__main__':
+    main()