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git://git.gnupg.org/gnupg.git
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85 lines
2.3 KiB
C
85 lines
2.3 KiB
C
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/* pubkey.c - pubkey dispatcher
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* Copyright (C) 1998 Free Software Foundation, Inc.
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*
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* This file is part of GNUPG.
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*
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* GNUPG 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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* GNUPG 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 "util.h"
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#include "errors.h"
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#include "mpi.h"
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#include "cipher.h"
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#include "dynload.h"
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/****************
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* This is the interface for the public key decryption.
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* ALGO gives the algorithm to use and this implicitly determines
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* the size of the arrays.
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* result is a pointer to a mpi variable which will receive a
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* newly allocated mpi or NULL in case of an error.
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*/
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int
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pubkey_decrypt( int algo, MPI *result, int ndata, MPI *data,
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int nskey, MPI *skey )
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{
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MPI plain = NULL;
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*result = NULL; /* so the caller can do always do an mpi_free */
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if( DBG_CIPHER ) {
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int i;
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log_debug("pubkey_decrypt: algo=%d\n", algo );
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for(i=0; i < nskey; i++ )
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log_mpidump(" skey:", skey[i] );
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for(i=0; i < ndata; i++ )
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log_mpidump(" data:", data[i] );
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}
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if( is_ELGAMAL(algo) ) {
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ELG_secret_key sk;
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assert( ndata == 2 && nskey == 4 );
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sk.p = skey[0];
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sk.g = skey[1];
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sk.y = skey[2];
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sk.x = skey[3];
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plain = mpi_alloc_secure( mpi_get_nlimbs( sk.p ) );
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elg_decrypt( plain, data[0], data[1], &sk );
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}
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else if( is_RSA(k->pubkey_algo) ) {
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RSA_secret_key sk;
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assert( ndata == 1 && nskey == 6 );
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sk.e = skey[0];
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sk.n = skey[1];
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sk.p = skey[2];
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sk.q = skey[3];
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sk.d = skey[4];
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sk.u = skey[5];
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plain = mpi_alloc_secure( mpi_get_nlimbs(sk.n) );
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rsa_secret( plain, data[0], &sk );
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}
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else
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return G10ERR_PUBKEY_ALGO;
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*result = plain;
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return 0;
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}
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