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38 results

dsa-hash.c

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  • Forked from Nettle / nettle
    Source project has a limited visibility.
    chacha-crypt.c 2.02 KiB
    /* chacha-crypt.c
    
       The crypt function in the ChaCha stream cipher.
       Heavily based on the Salsa20 implementation in Nettle.
    
       Copyright (C) 2014 Niels Möller
       Copyright (C) 2013 Joachim Strömbergson
       Copyright (C) 2012 Simon Josefsson
    
       This file is part of GNU Nettle.
    
       GNU Nettle is free software: you can redistribute it and/or
       modify it under the terms of either:
    
         * the GNU Lesser General Public License as published by the Free
           Software Foundation; either version 3 of the License, or (at your
           option) any later version.
    
       or
    
         * the GNU General Public License as published by the Free
           Software Foundation; either version 2 of the License, or (at your
           option) any later version.
    
       or both in parallel, as here.
    
       GNU Nettle 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
       General Public License for more details.
    
       You should have received copies of the GNU General Public License and
       the GNU Lesser General Public License along with this program.  If
       not, see http://www.gnu.org/licenses/.
    */
    
    /* Based on:
       chacha-ref.c version 2008.01.20.
       D. J. Bernstein
       Public domain.
    */
    
    #if HAVE_CONFIG_H
    # include "config.h"
    #endif
    
    #include <string.h>
    
    #include "chacha.h"
    
    #include "macros.h"
    #include "memxor.h"
    
    #define CHACHA_ROUNDS 20
    
    void
    chacha_crypt(struct chacha_ctx *ctx,
    	      size_t length,
    	      uint8_t *c,
    	      const uint8_t *m)
    {
      if (!length)
        return;
      
      for (;;)
        {
          uint32_t x[_CHACHA_STATE_LENGTH];
    
          _chacha_core (x, ctx->state, CHACHA_ROUNDS);
    
          ctx->state[13] += (++ctx->state[12] == 0);
    
          /* stopping at 2^70 length per nonce is user's responsibility */
          
          if (length <= CHACHA_BLOCK_SIZE)
    	{
    	  memxor3 (c, m, x, length);
    	  return;
    	}
          memxor3 (c, m, x, CHACHA_BLOCK_SIZE);
    
          length -= CHACHA_BLOCK_SIZE;
          c += CHACHA_BLOCK_SIZE;
          m += CHACHA_BLOCK_SIZE;
      }
    }