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salsa20-internal.h

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  • dsa-keygen.c 5.12 KiB
    /* dsa-keygen.c
     *
     * Generation of DSA keypairs
     */
    
    /* nettle, low-level cryptographics library
     *
     * Copyright (C) 2002 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 WITH_PUBLIC_KEY
    
    #include "dsa.h"
    
    #include "bignum.h"
    #include "memxor.h"
    
    #include <stdlib.h>
    
    /* The (slow) NIST method of generating DSA primes. Algorithm 4.56 of
     * Handbook of Applied Cryptography. */
    
    #define SEED_LENGTH SHA1_DIGEST_SIZE
    #define SEED_BITS (SEED_LENGTH * 8)
    
    static void
    hash(mpz_t x, uint8_t *digest)
    {
      mpz_t t;
      uint8_t data[SEED_LENGTH];
      struct sha1_ctx ctx;
      
      mpz_init_set(t, x);
      mpz_fdiv_r_2exp(t, t, SEED_BITS);
      
      nettle_mpz_get_str_256(SEED_LENGTH, data, t);
      mpz_clear(t);
    
      sha1_init(&ctx);
      sha1_update(&ctx, SEED_LENGTH, data);
      sha1_digest(&ctx, SHA1_DIGEST_SIZE, digest);
    }
    
    static void
    dsa_nist_gen(mpz_t p, mpz_t q,
    	     void *random_ctx, nettle_random_func random,
    	     void *progress_ctx, nettle_progress_func progress,
    	     unsigned L)
    {
      unsigned n;
      unsigned b;