[pycrypto] Create a Digital Signature (DER Encoded PKCS#1) - SHA1withRSA

[Anurag Chourasia]

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 <sbehrens at gmx.li> wrote:

> On 12/28/2010 2:44 PM, Anurag Chourasia wrote:
> >
> > I have a Private key and Public Key which comes in an XML in the
> > following form.
> [..]
> > Could you please let me know how I could use Crypto to meet this
> > requirement. Appreciate if you could help me with a simple code snippet.
> >
>
> Is this homework? :)
>
> If so, I'd give you a hint: Take a good look at the test routines in
> Crypto/Selftest, they are examples of how to use the library.
>
> Thorsten
>
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