[Botan-devel] RSA with EMSA3 padding

Rickard Bondesson Rickard.Bondesson at iis.se
Fri Nov 28 10:41:24 EST 2008

No, that is not right. EME_PKCS1v15 if for encrypting with RSA, block type 2. I would like block type 1.

This page:
have something called EMSA3 Raw. That is what I would like to use.

The padding should look like this:
0x00 0x01 0xff ... 0xff 0x00 hash/data
Which is what is used in the EMSA3 class in Botan.

I could do my own padding function, but is it possible to have the EMSA3 Raw functionality?

// Rickard

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Från: botan-devel-bounces at randombit.net [mailto:botan-devel-bounces at randombit.net] För Rickard Bondesson
Skickat: den 28 november 2008 15:22
Till: Botan development list
Ämne: Re: [Botan-devel] RSA with EMSA3 padding

Hmm.... It seems like I do want RSA signing with PKCS1 padding, but not with the aid of EMSA3. Is there another method?

Then perhaps I should pad it with EME_PKCS1v15::encode() and then pass it on to key->sign()?

// Rickard
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