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<H1>[pycrypto] PyCrypto AND Crypt_RSA integration</H1>
<B>Mads Kiilerich</B>
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TITLE="[pycrypto] PyCrypto AND Crypt_RSA integration">mads at kiilerich.com
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<I>Fri Feb 6 18:56:50 CST 2009</I>
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<PRE>Mauricio Arozi wrote, On 02/06/2009 07:53 PM:
><i> Hello,
</I>><i> I'm trying to import/export keys from/to Crypt_RSA
</I>><i> <<A HREF="http://pear.php.net/package/Crypt_RSA">http://pear.php.net/package/Crypt_RSA</A>>, using PyCrypto
</I>><i> <<A HREF="http://www.dlitz.net/software/pycrypto/">http://www.dlitz.net/software/pycrypto/</A>>. My problem is that while
</I>><i> using PyCrypto to generate both public and private keys, the
</I>><i> e(exponent?) is always the same.
</I>><i> According to this site: <A HREF="http://pajhome.org.uk/crypt/rsa/rsa.html,">http://pajhome.org.uk/crypt/rsa/rsa.html,</A> and
</I>><i> yet others, the e(exponent?) is used for the public key, and d for the
</I>><i> private key.
</I>
Yes, many implementations and applications of RSA uses a fixed exponent
- very often 65537 (F4). Usually that is a good decision and no problem
- perhaps except for interoperability.
And yes, interoperability is often very hard when implementing crypto
stuff. IMHO an important criteria when selecting a crypto library is
having examples / proof of how it interoperates with other implementations.
It is not clear to me exactly what you are asking for, so I can't answer
that directly - I hope someone else can do that.
/Mads
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