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docode.c

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  • chacha-set-key.c 1.54 KiB
    /* chacha-set-key.c
     *
     * Copyright (C) 2014 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., 51 Franklin Street, Fifth Floor, Boston,
     * MA 02111-1301, USA.
     */
    
    #if HAVE_CONFIG_H
    # include "config.h"
    #endif
    
    #include <stdlib.h>
    #include <string.h>
    
    #include "chacha.h"
    
    #include "macros.h"
    
    void
    chacha_set_key(struct chacha_ctx *ctx, const uint8_t *key)
    {
      static const uint32_t sigma[4] = {
        /* "expand 32-byte k" */
        0x61707865, 0x3320646e, 0x79622d32, 0x6b206574
      };
      ctx->state[4] = LE_READ_UINT32(key + 0);
      ctx->state[5] = LE_READ_UINT32(key + 4);
      ctx->state[6] = LE_READ_UINT32(key + 8);
      ctx->state[7] = LE_READ_UINT32(key + 12);
    
      ctx->state[8]  = LE_READ_UINT32(key + 16);
      ctx->state[9]  = LE_READ_UINT32(key + 20);
      ctx->state[10] = LE_READ_UINT32(key + 24);
      ctx->state[11] = LE_READ_UINT32(key + 28);
    
      memcpy (ctx->state, sigma, sizeof(sigma));
    }