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rsa-verify.c

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  • Forked from Nettle / nettle
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    rsa-verify.c 2.16 KiB
    /* rsa-verify.c
     *
     */
    
    /* nettle, low-level cryptographics library
     *
     * Copyright (C) 2002 Niels Möller
     *  
     * 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
    
    #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)
        {
          werror("Usage: rsa-verify PUBLIC-KEY SIGNATURE-FILE < FILE\n");
          return EXIT_FAILURE;
        }
    
      rsa_public_key_init(&key);
      
      if (!read_rsa_key(argv[1], &key, NULL))
        {