[pycrypto] PyCrypto AND Crypt_RSA integration

Mauricio Arozi mauricioarozi at gmail.com
Fri Feb 6 22:37:04 CST 2009

'I'm trying to *import/export keys* from/to
using PyCrypto <http://www.dlitz.net/software/pycrypto/>. '
'I've made some examples to find out why *it's not working*'

I want to import/export keys directly from/to
PyCrypto <http://www.dlitz.net/software/pycrypto/>." I'm not able to use the
same keys, so I can't verify signatures, or encrypt/decrypt stuff from php
to python and vice-versa. I want to know how to do it, actually I only need
a way to go with php, I don't depend on Crypt_RSA, it was already there

So in simple words, I only need to be able to encrypt/decrypt sign and
verify signs on php and python, simultaneously, if possible, using RSA algo.

On Fri, Feb 6, 2009 at 10:56 PM, Mads Kiilerich <mads at kiilerich.com> wrote:

> Mauricio Arozi wrote, On 02/06/2009 07:53 PM:
>> Hello,
>> I'm trying to import/export keys from/to Crypt_RSA <
>> http://pear.php.net/package/Crypt_RSA>, using PyCrypto <
>> http://www.dlitz.net/software/pycrypto/>. My problem is that while using
>> PyCrypto to generate both public and private keys, the e(exponent?) is
>> always the same.
>> According to this site: http://pajhome.org.uk/crypt/rsa/rsa.html, and yet
>> others, the e(exponent?) is used for the public key, and d for the private
>> key.
> 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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