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  • rsa_md5.c 2.98 KiB
    /* rsa_md5.c
     *
     * Signatures using RSA and MD5.
     */
    
    /* nettle, low-level cryptographics library
     *
     * Copyright (C) 2001 Niels Mller
     *  
     * 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
    
    #if HAVE_LIBGMP
    
    #include "rsa.h"
    
    #include "bignum.h"
    
    #include <assert.h>
    #include <stdlib.h>
    #include <string.h>
    
    /* Forward declarations */
    static void
    pkcs1_encode_md5(mpz_t m, unsigned length, struct md5_ctx *hash);
    
    void
    rsa_md5_sign(struct rsa_private_key *key,
                 struct md5_ctx *hash,
                 mpz_t s)
    {
      assert(key->size >= 45);
    
      pkcs1_encode_md5(s, key->size - 1, hash);
    
      rsa_compute_root(key, s, s);
    }
    
    int
    rsa_md5_verify(struct rsa_public_key *key,
                   struct md5_ctx *hash,
                   const mpz_t s)
    {
      int res;
      
      mpz_t m1;
      mpz_t m2;
      
      if ( (mpz_sgn(s) <= 0)
           || (mpz_cmp(s, key->n) >= 0) )
        return 0;
           
      mpz_init(m1); mpz_init(m2);