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<H1>[pycrypto] Create a Digital Signature (DER Encoded PKCS#1) - SHA1withRSA</H1>
<B>Anurag Chourasia</B>
<A HREF="mailto:pycrypto%40lists.dlitz.net?Subject=%5Bpycrypto%5D%20Create%20a%20Digital%20Signature%20%28DER%20Encoded%20PKCS%231%29%20-%0A%09SHA1withRSA&In-Reply-To=4D1A4272.5080002%40gmx.li"
TITLE="[pycrypto] Create a Digital Signature (DER Encoded PKCS#1) - SHA1withRSA">anurag.chourasia at gmail.com
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<I>Tue Dec 28 14:14:18 CST 2010</I>
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<PRE>Hi Thorsten,
Thanks for the response.
It wasn't for Home Work :-)
I went through some examples and I understand that to achieve my goal i have
to do two things.
1. Compute the Hash Value of my Data.
2. Sign the computed Hash Value with my Private Key.
To achieve 1 above, i believe that the following code will help me (assuming
that data is ABC).
from Crypto.Hash import SHA
m = SHA.new()
m.update('ABC')
What I am not sure is if I should use
m.digest()
or
m.hexdigest() as the computed hash value.
Following this, how can i use Crypto again to Sign the computed Hash Value
using the Private Key?
Appreciate your help on this.
Regards,
Anurag
On Wed, Dec 29, 2010 at 1:32 AM, Thorsten Behrens <<A HREF="http://lists.dlitz.net/cgi-bin/mailman/listinfo/pycrypto">sbehrens at gmx.li</A>> wrote:
><i> On 12/28/2010 2:44 PM, Anurag Chourasia wrote:
</I>><i> >
</I>><i> > I have a Private key and Public Key which comes in an XML in the
</I>><i> > following form.
</I>><i> [..]
</I>><i> > Could you please let me know how I could use Crypto to meet this
</I>><i> > requirement. Appreciate if you could help me with a simple code snippet.
</I>><i> >
</I>><i>
</I>><i> Is this homework? :)
</I>><i>
</I>><i> If so, I'd give you a hint: Take a good look at the test routines in
</I>><i> Crypto/Selftest, they are examples of how to use the library.
</I>><i>
</I>><i> Thorsten
</I>><i>
</I>><i> _______________________________________________
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