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<H1>[pycrypto] RSA output on long inputs can sometimes be gibberish</H1>
<B>Philip Horger</B>
<A HREF="mailto:pycrypto%40lists.dlitz.net?Subject=Re%3A%20%5Bpycrypto%5D%20RSA%20output%20on%20long%20inputs%20can%20sometimes%20be%20gibberish&In-Reply-To=%3CCAHAkNZ2Ffc9kbT2EXqyD1Y5EnFvfy6KCRwkKK5uHBowE9ciqJw%40mail.gmail.com%3E"
TITLE="[pycrypto] RSA output on long inputs can sometimes be gibberish">campadrenalin at gmail.com
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<I>Fri Jul 27 09:19:48 EDT 2012</I>
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<PRE>Fantastic! Thank you very much, this sounds like exactly what I was looking
for!
On Fri, Jul 27, 2012 at 3:15 AM, Sebastian Ramacher <
<A HREF="http://lists.dlitz.net/cgi-bin/mailman/listinfo/pycrypto">sebastian+lists at ramacher.at</A>> wrote:
><i> Running the tests fails most of the time with:
</I>><i>
</I>><i> $ python -m ejtp.rsatest
</I>><i> key1 >> key2
</I>><i> Traceback (most recent call last):
</I>><i> File "/usr/lib/python2.7/runpy.py", line 162, in _run_module_as_main
</I>><i> "__main__", fname, loader, pkg_name)
</I>><i> File "/usr/lib/python2.7/runpy.py", line 72, in _run_code
</I>><i> exec code in run_globals
</I>><i> File "/tmp/EJTP-lib-python/ejtp/rsatest.py", line 33, in <module>
</I>><i> test_run(key1, key2)
</I>><i> File "/tmp/EJTP-lib-python/ejtp/rsatest.py", line 27, in test_run
</I>><i> ciphertext = encode(plaintext, key1, key2)
</I>><i> File "/tmp/EJTP-lib-python/ejtp/rsatest.py", line 19, in encode
</I>><i> return reciever.encrypt(sender.decrypt(msg))
</I>><i> File "ejtp/util/crypto/rsa.py", line 44, in encrypt
</I>><i> value[marker:marker+self.blocksize], "")[0])
</I>><i> File "/usr/lib/python2.7/dist-packages/Crypto/PublicKey/RSA.py", line
</I>><i> 150, in
</I>><i> encrypt
</I>><i> return pubkey.pubkey.encrypt(self, plaintext, K)
</I>><i> File "/usr/lib/python2.7/dist-packages/Crypto/PublicKey/pubkey.py", line
</I>><i> 75,
</I>><i> in encrypt
</I>><i> ciphertext=self._encrypt(plaintext, K)
</I>><i> File "/usr/lib/python2.7/dist-packages/Crypto/PublicKey/RSA.py", line
</I>><i> 224, in
</I>><i> _encrypt
</I>><i> return (self.key._encrypt(c),)
</I>><i> ValueError: Plaintext too large
</I>><i>
</I>><i> The code in ejtp/util/crypto/rsa.py looks like you're not doing proper
</I>><i> padding
</I>><i> and using fixed sized blocks that don't depend on the key parameters. That
</I>><i> won't
</I>><i> work.
</I>><i>
</I>><i> You might want to have a look at PKCS#1 OAEP and pycrypto's
</I>><i> Crypto.Cipher.PKCS1_OAEP module [1].
</I>><i>
</I>><i> Kind regards
</I>><i>
</I>><i> [1]
</I>><i>
</I>><i> <A HREF="https://www.dlitz.net/software/pycrypto/api/current/Crypto.Cipher.PKCS1_OAEP-module.html">https://www.dlitz.net/software/pycrypto/api/current/Crypto.Cipher.PKCS1_OAEP-module.html</A>
</I>><i> _______________________________________________
</I>><i> pycrypto mailing list
</I>><i> <A HREF="http://lists.dlitz.net/cgi-bin/mailman/listinfo/pycrypto">pycrypto at lists.dlitz.net</A>
</I>><i> <A HREF="http://lists.dlitz.net/cgi-bin/mailman/listinfo/pycrypto">http://lists.dlitz.net/cgi-bin/mailman/listinfo/pycrypto</A>
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