Re: ElGamal, EME-PKCS1-v1_5
Marko Kreen <markokr@gmail.com> Thu, 24 June 2010 19:52 UTC
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In-Reply-To: <20100624173119.GJ25604@brian.internal.monetra.com>
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Date: Thu, 24 Jun 2010 22:52:35 +0300
Message-ID: <AANLkTilyE2RAaXxa2sfKgzY0xiGM6Y-5budUOJbTkdwd@mail.gmail.com>
Subject: Re: ElGamal, EME-PKCS1-v1_5
From: Marko Kreen <markokr@gmail.com>
To: Brian Lewis <brian@monetra.com>
Cc: ietf-openpgp@imc.org
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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 -- marko
- 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