mirror of git://git.gnupg.org/gnupg.git
97 lines
2.4 KiB
C
97 lines
2.4 KiB
C
/* checksig.c - check a signature
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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 "packet.h"
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#include "iobuf.h"
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#include "memory.h"
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#include "util.h"
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#include "cipher.h"
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static void
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usage(void)
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{
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fprintf(stderr, "usage: checksig textfile sigfile\n");
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exit(1);
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}
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int
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main(int argc, char **argv)
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{
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IOBUF a;
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PACKET pkt;
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PKT_signature *sig;
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int rc, result, c;
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FILE *fp;
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MD5HANDLE md5;
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if( argc != 3 )
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usage();
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argc--; argv++;
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if( !(a = iobuf_open(argv[1])) )
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log_fatal("can't open '%s'\n", argv[1]);
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init_packet(&pkt);
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while( (rc=parse_packet(a, &pkt)) != -1 ) {
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if( !rc && pkt.pkttype == PKT_SECKEY_ENC ) {
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sig = pkt.pkt.signature;
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printf("sig: keyid=%08lX%08lX: ", sig->keyid[0], sig->keyid[1] );
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if( sig->pubkey_algo == PUBKEY_ALGO_RSA ) {
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if( sig->d.rsa.digest_algo == DIGEST_ALGO_MD5 ) {
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if( !(fp = fopen(*argv, "rb")) )
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log_fatal("can't open '%s'\n", *argv);
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md5 = md5_open(0);
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while( (c=getc(fp)) != EOF )
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md5_putchar(md5, c );
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fclose(fp);
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result = md5_signature_check( sig, md5 );
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md5_close(md5);
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}
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else
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result = G10ERR_DIGEST_ALGO;
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}
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else
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result = G10ERR_PUBKEY_ALGO;
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if( !result )
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fputs( "signature is good", stdout );
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else if( result == G10ERR_DIGEST_ALGO )
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printf( "Unknown digest algorithm %d", sig->d.rsa.digest_algo);
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else if( result == G10ERR_PUBKEY_ALGO )
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printf( "Unknown pubkey algorithm %d", sig->pubkey_algo);
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else
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fputs( g10_errstr(result), stdout);
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putchar('\n');
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}
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free_packet(&pkt);
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}
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iobuf_close(a);
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return 0;
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}
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