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    <p>PyCrypto has no function, which can manage RSA passphrase. </p> <p>Instead, You can use <strong>ezPyCrypto</strong> (<a href="http://freenet.mcnabhosting.com/ezPyCrypto/" rel="nofollow noreferrer">homepage</a>) module, which is built top of PyCrypto module. It has simpler interface and lets you: </p> <ul> <li>Generate, export and import public and private keys</li> <li>Encrypt and decrypt strings with ease</li> <li>Optionally create encrypted data as email-friendly text</li> <li>Sign and verify strings (incl. documents)</li> <li><strong>Protect your private key with a passphrase</strong></li> <li>Create 'streams', for sending data through secured sockets</li> <li>Choose any public key size you like (2048-bit recommended)</li> <li>Choose between RSA and ElGamal for public key, and IDEA, DES3, Blowfish, ARC4, IDEA for session key</li> <li>Rest in the comfort of security, with 256-bit session keys and defences against common RSA and ElGamal attacks, which will painfully frustrate anyone seeking to violate your privacy.</li> </ul> <p><strong>Usage:</strong></p> <pre><code>""" example7.py Demonstrate the use of passphrases with private keys """ import ezPyCrypto mysecret = "Don't look at this!!!" raw = "Here is a string to encrypt" # Create a key object k = ezPyCrypto.key(passphrase=mysecret) # Export public/private key publicAndPrivateKey = k.exportKeyPrivate() # Encrypt against this keypair enc = k.encString(raw) # Create a new key object, and import keys (with passphrase) k1 = ezPyCrypto.key(publicAndPrivateKey, passphrase=mysecret) # Decrypt text dec = k.decString(enc) # test if dec == raw: print "Successful decryption using correct passphrase" else: print "Failed somewhere" print "Trying now with a bad passphrase" try: k2 = ezPyCrypto.key(publicAndPrivateKey, passphrase="cracking attempt") except ezPyCrypto.CryptoKeyError: print "Oops - our feeble cracking attempt failed (which is a good thing)." else: print "Cracking attempt succeeded - we're not safe" # We're in - let's plunder dec2 = k2.decString(enc) </code></pre> <p><strong>Build it</strong></p> <p>If you look into ezCryptoPy source,then you'll see key is actually encrypted/decrypted by using BlueFish algorithm:</p> <pre><code> # decrypt against passphrase blksiz = 8 # lazy of me # create temporary symmetric cipher object for passphrase - #hardwire to Blowfish ppCipher = Blowfish.new(passphrase, Blowfish.MODE_CFB, self._passIV[0:blksiz]) enclen = len(keyobj) decpriv = '' i = 0 while i &lt; enclen: decbit = ppCipher.decrypt(keyobj[i:i+blksiz]) decpriv += decbit i += blksiz keyobj = decpriv[0:size] </code></pre> <p>That means, you can write your own passphrase handler by using previous code example without installing ezPyCrypto. Here can you find many code examples, how do to it yourself: <a href="http://nullege.com/codes/search/Crypto.PublicKey.RSA" rel="nofollow noreferrer">Nullege code search</a></p> <p><strong>My first and alternative solution:</strong></p> <p>You can use python <em>exec()</em> function and commandline function "ssh-keygen"(<a href="http://kimmo.suominen.com/docs/ssh/#passwd" rel="nofollow noreferrer">doc</a>):</p> <p><code>ssh-keygen -p [-P old_passphrase] [-N new_passphrase] [-f keyfile]</code>. </p>
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