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41 results

prot-a-send-async.c

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  • aes-set-encrypt-key.c 2.12 KiB
    /* aes-set-encrypt-key.c
     *
     * Key setup for the aes/rijndael block cipher.
     */
    
    /* nettle, low-level cryptographics library
     *
     * Copyright (C) 2000, 2001, 2002 Rafael R. Sevilla, 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.
     */
    
    /* Originally written by Rafael R. Sevilla <dido@pacific.net.ph> */
    
    #if HAVE_CONFIG_H
    # include "config.h"
    #endif
    
    #include <assert.h>
    
    #include "aes-internal.h"
    #include "macros.h"
    
    void
    aes_set_encrypt_key(struct aes_ctx *ctx,
    		    unsigned keysize, const uint8_t *key)
    {
      static const uint8_t rcon[10] = {
        0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80,0x1b,0x36,
      };
      unsigned nk, nr, i, lastkey;
      uint32_t temp;
      const uint8_t *rp;
    
      assert(keysize >= AES_MIN_KEY_SIZE);
      assert(keysize <= AES_MAX_KEY_SIZE);
      
      /* Truncate keysizes to the valid key sizes provided by Rijndael */
      if (keysize == 32) {
        nk = 8;
        nr = 14;
      } else if (keysize >= 24) {
        nk = 6;
        nr = 12;
      } else { /* must be 16 or more */
        nk = 4;
        nr = 10;
      }
    
      lastkey = (AES_BLOCK_SIZE/4) * (nr + 1);
      ctx->nrounds = nr;
    
      for (i=0, rp = rcon; i<nk; i++)
        ctx->keys[i] = LE_READ_UINT32(key + i*4);
    
      for (i=nk; i<lastkey; i++)
        {
          temp = ctx->keys[i-1];
          if (i % nk == 0)
    	temp = SUBBYTE(ROTL32(24, temp), aes_sbox) ^ *rp++;
    
          else if (nk > 6 && (i%nk) == 4)
    	temp = SUBBYTE(temp, aes_sbox);
    
          ctx->keys[i] = ctx->keys[i-nk] ^ temp;
        }
    }