From 63675694c858e060dfcd90ad68ff502119a684e6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Niels=20M=C3=B6ller?= <nisse@lysator.liu.se>
Date: Tue, 1 Oct 2002 15:48:24 +0200
Subject: [PATCH] New example program.
Rev: src/nettle/examples/rsa-verify.c:1.1
---
examples/rsa-verify.c | 114 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 114 insertions(+)
create mode 100644 examples/rsa-verify.c
diff --git a/examples/rsa-verify.c b/examples/rsa-verify.c
new file mode 100644
index 00000000..77e25694
--- /dev/null
+++ b/examples/rsa-verify.c
@@ -0,0 +1,114 @@
+/* rsa-verify.c
+ *
+ */
+
+/* nettle, low-level cryptographics library
+ *
+ * Copyright (C) 2002 Niels M�ller
+ *
+ * The nettle library is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or (at your
+ * option) any later version.
+ *
+ * The nettle library 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 Lesser General Public
+ * License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with the nettle library; see the file COPYING.LIB. If not, write to
+ * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ */
+
+#if HAVE_CONFIG_H
+# include "config.h"
+#endif /* HAVE_CONFIG_H */
+
+#if !WITH_PUBLIC_KEY
+int
+main(int argc, char **argv)
+{
+ fprintf(stderr,
+ "You need to install GMP somewhere where Nettle can find it,\n"
+ "and recompile Nettle\n");
+ return EXIT_FAILURE;
+}
+#else /* WITH_PUBLIC_KEY */
+
+#include <errno.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "rsa.h"
+#include "io.h"
+
+static int
+read_signature(const char *name, mpz_t s)
+{
+ char *buffer;
+ unsigned length;
+ int res;
+
+ length = read_file(name, 0, &buffer);
+ if (!length)
+ return 0;
+
+ res = (mpz_set_str(s, buffer, 16) == 0);
+ free(buffer);
+
+ return res;
+}
+
+int
+main(int argc, char **argv)
+{
+ struct rsa_public_key key;
+ struct sha1_ctx hash;
+ mpz_t s;
+
+ if (argc != 3)
+ {
+ fprintf(stderr, "Usage: rsa-sign PUBLIC-KEY SIGNATURE-FILE < file\n");
+ return EXIT_FAILURE;
+ }
+
+ rsa_init_public_key(&key);
+
+ if (!read_rsa_key(argv[1], &key, NULL))
+ {
+ fprintf(stderr, "Invalid key\n");
+ return EXIT_FAILURE;
+ }
+
+ mpz_init(s);
+
+ if (!read_signature(argv[2], s))
+ {
+ fprintf(stderr, "Failed to read signature file `%s'\n",
+ argv[2]);
+ return EXIT_FAILURE;
+ }
+
+ sha1_init(&hash);
+ if (!hash_file(&nettle_sha1, &hash, stdin))
+ {
+ fprintf(stderr, "Failed reading stdin: %s\n",
+ strerror(errno));
+ return 0;
+ }
+
+ if (!rsa_sha1_verify(&key, &hash, s))
+ {
+ fprintf(stderr, "Invalid signature!\n");
+ return EXIT_FAILURE;
+ }
+
+ mpz_clear(s);
+ rsa_clear_public_key(&key);
+
+ return EXIT_SUCCESS;
+}
+#endif /* WITH_PUBLIC_KEY */
--
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