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bignum.c

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  • yarrow.h 2.72 KiB
    /* yarrow.h
     *
     * The yarrow pseudo-randomness generator.
     */
    
    /* 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.
     */
     
    #ifndef NETTLE_YARROW_COMPAT_H_INCLUDED
    #define NETTLE_YARROW_COMPAT_H_INCLUDED
    
    #include "aes.h"
    #include "sha.h"
    
    enum yarrow_pool_id { YARROW_FAST = 0, YARROW_SLOW = 1 };
    
    struct yarrow_source
    {
      /* Indexed by yarrow_pool_id */
      uint32_t estimate[2];
      
      /* The pool next sample should go to. */
      enum yarrow_pool_id next;
    };
    
    
    #define YARROW256_SEED_FILE_SIZE (2 * AES_BLOCK_SIZE)
    
    /* Yarrow-256, based on SHA-256 and AES-256 */
    struct yarrow256_ctx
    {
      /* Indexed by yarrow_pool_id */
      struct sha256_ctx pools[2];
    
      uint8_t seed_file[YARROW256_SEED_FILE_SIZE];
      
      int seeded;
    
      /* The current key and counter block */
      struct aes_ctx key;
      uint8_t counter[AES_BLOCK_SIZE];
    
      /* The entropy sources */
      unsigned nsources;
      struct yarrow_source *sources;
    };
    
    void
    yarrow256_init(struct yarrow256_ctx *ctx,
    	       unsigned nsources,
    	       struct yarrow_source *sources);
    
    void
    yarrow256_seed(struct yarrow256_ctx *ctx,
    	       unsigned length,
    	       uint8_t *seed_file);
    
    /* Returns 1 on reseed */
    int
    yarrow256_update(struct yarrow256_ctx *ctx,
    		 unsigned source, unsigned entropy,
    		 unsigned length, const uint8_t *data);
    
    void
    yarrow256_random(struct yarrow256_ctx *ctx, unsigned length, uint8_t *dst);
    
    int
    yarrow256_is_seeded(struct yarrow256_ctx *ctx);
    
    unsigned
    yarrow256_needed_sources(struct yarrow256_ctx *ctx);
    
    void
    yarrow256_force_reseed(struct yarrow256_ctx *ctx);
    
    
    /* Key event estimator */
    #define YARROW_KEY_EVENT_BUFFER 16
    
    struct yarrow_key_event_ctx
    {
      /* Counter for initial priming of the state */
      unsigned index;
      unsigned chars[YARROW_KEY_EVENT_BUFFER];
      unsigned previous;
    };
    
    void
    yarrow_key_event_init(struct yarrow_key_event_ctx *ctx);
    
    unsigned
    yarrow_key_event_estimate(struct yarrow_key_event_ctx *ctx,
    			  unsigned key, unsigned time);
      
    #endif /* NETTLE_YARROW_COMPAT_H_INCLUDED */