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