[Botan-devel] RSA with EMSA3 padding
Rickard.Bondesson at iis.se
Fri Nov 28 08:52:30 EST 2008
Ohh, sorry I misinterpreted the standard document that I am working with: PKCS#11
RFC 3447 states that: "Accordingly, the EMSA-PKCS-v1_5 encoding method explicitly includes a hash operation and is not intended for signature schemes with message recovery."
Thus is it not possible to have EMSA3 without an hash algorithm as I wanted. The thing I want is plain signing with the RSA key, which is possible. I just thought that I should pad it like EMSA3, which is not possible.
Från: botan-devel-bounces at randombit.net [mailto:botan-devel-bounces at randombit.net] För Jack Lloyd
Skickat: den 28 november 2008 14:34
Till: Botan development list
Ämne: Re: [Botan-devel] RSA with EMSA3 padding
On Wed, Nov 26, 2008 at 04:13:18PM +0100, Rickard Bondesson wrote:
> I am trying to sign data with RSA and I am using PK_Signer for this
> task. It works well if I also want to hash the data that I get. Is
> there a way of using PK_Signer with EMSA3 padding but no hash
Sorry about the delay, Thanksgiving here the US was occupying me.
Is the reason you want to do this to support some custom hash function? I don't quite understand the problem.
One wrinkle is that EMSA3 padding includes a hash identifier - it's not clear to me what hash id EMSA3 should include in the case of no hash at all.
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