1 files changed, 96 insertions, 0 deletions
diff --git a/g10/checksig.c b/g10/checksig.c
new file mode 100644
index 000000000..7f00d5801
--- /dev/null
+++ b/g10/checksig.c
@@ -0,0 +1,96 @@
+/* checksig.c - check a signature
+ *	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 "packet.h"
+#include "iobuf.h"
+#include "memory.h"
+#include "util.h"
+#include "cipher.h"
+
+static void
+usage(void)
+{
+    fprintf(stderr, "usage: checksig textfile sigfile\n");
+    exit(1);
+}
+
+
+int
+main(int argc, char **argv)
+{
+    IOBUF a;
+    PACKET pkt;
+    PKT_signature *sig;
+    int rc, result, c;
+    FILE *fp;
+    MD5HANDLE md5;
+
+    if( argc != 3 )
+	usage();
+    argc--; argv++;
+
+
+    if( !(a = iobuf_open(argv[1])) )
+	log_fatal("can't open '%s'\n", argv[1]);
+
+    init_packet(&pkt);
+    while( (rc=parse_packet(a, &pkt)) != -1 ) {
+	if( !rc && pkt.pkttype == PKT_SECKEY_ENC ) {
+	    sig = pkt.pkt.signature;
+	    printf("sig: keyid=%08lX%08lX: ", sig->keyid[0], sig->keyid[1] );
+	    if( sig->pubkey_algo == PUBKEY_ALGO_RSA ) {
+		if( sig->d.rsa.digest_algo == DIGEST_ALGO_MD5 ) {
+		    if( !(fp = fopen(*argv, "rb")) )
+			log_fatal("can't open '%s'\n", *argv);
+		    md5 = md5_open(0);
+		    while( (c=getc(fp)) != EOF )
+			md5_putchar(md5, c );
+		    fclose(fp);
+		    result = md5_signature_check( sig, md5 );
+		    md5_close(md5);
+		}
+		else
+		    result = G10ERR_DIGEST_ALGO;
+	    }
+	    else
+		result = G10ERR_PUBKEY_ALGO;
+
+	    if( !result )
+		fputs( "signature is good", stdout );
+	    else if( result == G10ERR_DIGEST_ALGO )
+		printf( "Unknown digest algorithm %d", sig->d.rsa.digest_algo);
+	    else if( result == G10ERR_PUBKEY_ALGO )
+		printf( "Unknown pubkey algorithm %d", sig->pubkey_algo);
+	    else
+		fputs( g10_errstr(result), stdout);
+	    putchar('\n');
+	}
+	free_packet(&pkt);
+    }
+
+    iobuf_close(a);
+    return 0;
+}
+
+