mirror of
git://git.gnupg.org/gnupg.git
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99 lines
2.8 KiB
C
99 lines
2.8 KiB
C
/* elg.c
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* Copyright (c) 1997 by Werner Koch (dd9jn)
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*
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* This file is part of G10.
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*
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* G10 is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* G10 is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <assert.h>
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#include "options.h"
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#include "packet.h"
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#include "errors.h"
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#include "iobuf.h"
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#include "keydb.h"
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#include "memory.h"
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#include "util.h"
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#include "main.h"
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void
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g10_elg_encrypt( PKT_public_cert *pkc, PKT_pubkey_enc *enc, DEK *dek )
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{
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ELG_public_key pkey;
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MPI frame;
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assert( enc->pubkey_algo == PUBKEY_ALGO_ELGAMAL );
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enc->d.elg.a = mpi_alloc( mpi_get_nlimbs(pkc->d.elg.p) );
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enc->d.elg.b = mpi_alloc( mpi_get_nlimbs(pkc->d.elg.p) );
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keyid_from_pkc( pkc, enc->keyid );
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frame = encode_session_key( dek, mpi_get_nbits(pkc->d.elg.p) );
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pkey.p = pkc->d.elg.p;
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pkey.g = pkc->d.elg.g;
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pkey.y = pkc->d.elg.y;
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if( DBG_CIPHER )
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log_mpidump("Plain DEK frame: ", frame);
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elg_encrypt( enc->d.elg.a, enc->d.elg.b, frame, &pkey);
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mpi_free( frame );
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if( DBG_CIPHER ) {
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log_mpidump("Encry DEK a: ", enc->d.elg.a );
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log_mpidump(" DEK b: ", enc->d.elg.b );
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}
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if( opt.verbose ) {
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char *ustr = get_user_id_string( enc->keyid );
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log_info("ElGamal encrypted for: %s\n", ustr );
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m_free(ustr);
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}
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}
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void
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g10_elg_sign( PKT_secret_cert *skc, PKT_signature *sig, MD_HANDLE *md )
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{
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ELG_secret_key skey;
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MPI frame;
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byte *dp;
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assert( sig->pubkey_algo == PUBKEY_ALGO_ELGAMAL );
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dp = md_final( md );
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keyid_from_skc( skc, sig->keyid );
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sig->d.elg.digest_algo = md->algo;
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sig->d.elg.digest_start[0] = dp[0];
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sig->d.elg.digest_start[1] = dp[1];
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sig->d.elg.a = mpi_alloc( mpi_get_nlimbs(skc->d.elg.p) );
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sig->d.elg.b = mpi_alloc( mpi_get_nlimbs(skc->d.elg.p) );
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frame = encode_md_value( md, mpi_get_nbits(skc->d.elg.p));
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skey.p = skc->d.elg.p;
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skey.g = skc->d.elg.g;
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skey.y = skc->d.elg.y;
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skey.x = skc->d.elg.x;
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elg_sign( sig->d.elg.a, sig->d.elg.b, frame, &skey);
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memset( &skey, 0, sizeof skey );
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mpi_free(frame);
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if( opt.verbose ) {
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char *ustr = get_user_id_string( sig->keyid );
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log_info("ElGamal signature from: %s\n", ustr );
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m_free(ustr);
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}
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}
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