Re: ElGamal, EME-PKCS1-v1_5
Brian Lewis <brian@monetra.com> Thu, 24 June 2010 20:08 UTC
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Date: Thu, 24 Jun 2010 16:10:26 -0400
From: Brian Lewis <brian@monetra.com>
To: Marko Kreen <markokr@gmail.com>
Cc: ietf-openpgp@imc.org
Subject: Re: ElGamal, EME-PKCS1-v1_5
Message-ID: <20100624201026.GL25604@brian.internal.monetra.com>
References: <20100624173119.GJ25604@brian.internal.monetra.com> <AANLkTilyE2RAaXxa2sfKgzY0xiGM6Y-5budUOJbTkdwd@mail.gmail.com>
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On Thursday, 24.06.10 at 22:52, Marko Kreen wrote: > On 6/24/10, Brian Lewis <brian@monetra.com> wrote: > > I'm trying to generate a tag 1 (public-key encrypted session key) > > packet. > > > > I'm using ElGamal, so the algorithm-specific fields are, according to > > http://tools.ietf.org/html/rfc4880#section-5.1, > > MPI g**k mod p > > MPI m * y**k mod p > > > > So I need m = EME-PKCS1-v1_5(...). According to > > http://tools.ietf.org/html/rfc3447#section-7.2.1, PS is k - mLen > > - 3 random nonzero bytes, where k is the length of RSA n in bytes. But I > > don't have RSA n. I have ElGamal p, g, and y. > > > > In EME-PKCS1-v1_5, what is k if I'm using ElGamal? > > mod p ~ mod n I don't understand. Could you elaborate?
- Re: ElGamal, EME-PKCS1-v1_5 Daniel A. Nagy
- Re: ElGamal, EME-PKCS1-v1_5 Brian Lewis
- Re: ElGamal, EME-PKCS1-v1_5 Marko Kreen
- ElGamal, EME-PKCS1-v1_5 Brian Lewis