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desCode.h

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  • Forked from Nettle / nettle
    Source project has a limited visibility.
    dsa-keygen.c 2.90 KiB
    /* dsa-keygen.c
     *
     * Generation of DSA keypairs
     */
    
    /* 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 <assert.h>
    #include <stdlib.h>
    
    #include "dsa.h"
    
    #include "bignum.h"
    #include "nettle-internal.h"
    
    
    /* Valid sizes, according to FIPS 186-3 are (1024, 160), (2048. 224),
       (2048, 256), (3072, 256). Currenty, we use only q_bits of 160 or
       256. */
    int
    dsa_generate_keypair(struct dsa_public_key *pub,
    		     struct dsa_private_key *key,
    		     void *random_ctx, nettle_random_func random,
    		     void *progress_ctx, nettle_progress_func progress,
    		     unsigned p_bits, unsigned q_bits)
    {
      mpz_t p0, p0q, r;
      unsigned p0_bits;
      unsigned a;
    
      switch (q_bits)
        {
        case 160:
          if (p_bits < DSA_SHA1_MIN_P_BITS)
    	return 0;
          break;
        case 256:
          if (p_bits < DSA_SHA256_MIN_P_BITS)
    	return 0;
          break;
        default:
          return 0;
        }
    
      mpz_init (p0);
      mpz_init (p0q);
      mpz_init (r);