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You should do it by defining your own class derived
from HashTransformation (say SHA_MD5) and then you can use:
RSASS<PSS, SHA_MD5>::Signer signer;
...
signer.SignMessage(...);
----- Original Message -----
Sent: Thursday, September 14, 2006 7:35
PM
Subject: RE: SHA/MD5 Combination
Hi Søren
then how SHA/MD5 Combination or any custom signatures will be
implemented?
Regards
Have a look here:
http://www.eskimo.com/~weidai/cgi-bin/fom-serve/cache/96.html
Date: Wed, 13 Sep 2006 05:22:48 -0700
From: [EMAIL PROTECTED]
Subject:
Re: SHA/MD5 Combination
To: [email protected]
Hi all
Does the library support asymmetric
encryption using private key in
RSA?
Regards
Haytham Mohammed
Jakub <[EMAIL PROTECTED]>
wrote:
Yes,
Mohammed, I want to prevent the colisions. MD5 is not as resistant
as
SHA-1, while co-author of SHA-1 is NSA, so we are not 100% sure,
if they
have this alg. cracked, but is good rated anyway! Crypto++
contains 2
different types, i.e. RSA-ES for encryption and RSA-SS for
signature. You
say that I can use RSA-ES, that is intended for
encryption and sign the
combined hash using its private key? The
truth is I am not sure how to do
it...
Haytham Mohammed
wrote:
>
> Hi Jakub
>
> What is your reference
for this idea? (it is a creative one :) )
> I think it will be
more secure since the collision resistance will be
>
increased.
>
> you are going to hash the message
twice
> 1-once with SHA and other with MD5
> 2-then concat
the 2 hashes
> 3-then encrypt the result from 2 using your private
key (using RSA)
> 4- the result from 3 is the signature :)
>
> Regards
> Haytham Mohammed
>
> Jakub
wrote:
>
> Does anybody know, how to combine i.e. SHA + MD5
hashes in one signature
> (i.e. RSA)? I know that there may be 2
separated signatures, but it should
> be more secure and efficient
having 2 hashes in one signature.
> Thanks, Jakub
> --
> View this message in context:
>
http://www.nabble.com/SHA-MD5-Combination-tf2192153.html#a6066434
>
Sent from the Crypto++ forum at Nabble.com.
>
>
>
>
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--
View this message in
context:
http://www.nabble.com/SHA-MD5-Combination-tf2192153.html#a6179915
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from the Crypto++ forum at Nabble.com.
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