File: sha3-permute.c

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/* sha3-permute.c
 *
 * The sha3 permutation function (aka Keccak).
 */

/* nettle, low-level cryptographics library
 *
 * Copyright (C) 2012 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 "sha3.h"

#include "macros.h"

#define SHA3_ROUNDS 24

void
sha3_permute (struct sha3_state *state)
{
  static const uint64_t rc[SHA3_ROUNDS] = {
    0x0000000000000001ULL, 0X0000000000008082ULL,
    0X800000000000808AULL, 0X8000000080008000ULL,
    0X000000000000808BULL, 0X0000000080000001ULL,
    0X8000000080008081ULL, 0X8000000000008009ULL,
    0X000000000000008AULL, 0X0000000000000088ULL,
    0X0000000080008009ULL, 0X000000008000000AULL,
    0X000000008000808BULL, 0X800000000000008BULL,
    0X8000000000008089ULL, 0X8000000000008003ULL,
    0X8000000000008002ULL, 0X8000000000000080ULL,
    0X000000000000800AULL, 0X800000008000000AULL,
    0X8000000080008081ULL, 0X8000000000008080ULL,
    0X0000000080000001ULL, 0X8000000080008008ULL,
  };

  /* Original permutation:
     
       0,10,20, 5,15,
      16, 1,11,21, 6,
       7,17, 2,12,22,
      23, 8,18, 3,13,
      14,24, 9,19, 4

     Rotation counts:

       0,  1, 62, 28, 27,
      36, 44,  6, 55, 20,
       3, 10, 43, 25, 39,
      41, 45, 15, 21,  8,
      18,  2, 61, 56, 14,
  */

  /* In-place implementation. Permutation done as a long sequence of
     25 moves "following" the permutation.

      T <--  1
      1 <--  6
      6 <--  9
      9 <-- 22
     22 <-- 14
     14 <-- 20
     20 <--  2
      2 <-- 12
     12 <-- 13
     13 <-- 19
     19 <-- 23
     23 <-- 15
     15 <--  4
      4 <-- 24
     24 <-- 21
     21 <--  8
      8 <-- 16
     16 <--  5
      5 <--  3
      3 <-- 18
     18 <-- 17
     17 <-- 11
     11 <--  7
      7 <-- 10
     10 <--  T

  */
  uint64_t C[5], D[5], T, X;
  unsigned i, y;

#define A state->a

  C[0] = A[0] ^ A[5+0] ^ A[10+0] ^ A[15+0] ^ A[20+0];
  C[1] = A[1] ^ A[5+1] ^ A[10+1] ^ A[15+1] ^ A[20+1];
  C[2] = A[2] ^ A[5+2] ^ A[10+2] ^ A[15+2] ^ A[20+2];
  C[3] = A[3] ^ A[5+3] ^ A[10+3] ^ A[15+3] ^ A[20+3];
  C[4] = A[4] ^ A[5+4] ^ A[10+4] ^ A[15+4] ^ A[20+4];

  for (i = 0; i < SHA3_ROUNDS; i++)
    {
      D[0] = C[4] ^ ROTL64(1, C[1]);
      D[1] = C[0] ^ ROTL64(1, C[2]);
      D[2] = C[1] ^ ROTL64(1, C[3]);
      D[3] = C[2] ^ ROTL64(1, C[4]);
      D[4] = C[3] ^ ROTL64(1, C[0]);

      A[0] ^= D[0];
      X = A[ 1] ^ D[1];     T = ROTL64(1, X);
      X = A[ 6] ^ D[1]; A[ 1] = ROTL64 (44, X);
      X = A[ 9] ^ D[4]; A[ 6] = ROTL64 (20, X);
      X = A[22] ^ D[2]; A[ 9] = ROTL64 (61, X);
      X = A[14] ^ D[4]; A[22] = ROTL64 (39, X);
      X = A[20] ^ D[0]; A[14] = ROTL64 (18, X);
      X = A[ 2] ^ D[2]; A[20] = ROTL64 (62, X);
      X = A[12] ^ D[2]; A[ 2] = ROTL64 (43, X);
      X = A[13] ^ D[3]; A[12] = ROTL64 (25, X);
      X = A[19] ^ D[4]; A[13] = ROTL64 ( 8, X);
      X = A[23] ^ D[3]; A[19] = ROTL64 (56, X);
      X = A[15] ^ D[0]; A[23] = ROTL64 (41, X);
      X = A[ 4] ^ D[4]; A[15] = ROTL64 (27, X);
      X = A[24] ^ D[4]; A[ 4] = ROTL64 (14, X);
      X = A[21] ^ D[1]; A[24] = ROTL64 ( 2, X);
      X = A[ 8] ^ D[3]; A[21] = ROTL64 (55, X); /* row 4 done */
      X = A[16] ^ D[1]; A[ 8] = ROTL64 (45, X);
      X = A[ 5] ^ D[0]; A[16] = ROTL64 (36, X);
      X = A[ 3] ^ D[3]; A[ 5] = ROTL64 (28, X);
      X = A[18] ^ D[3]; A[ 3] = ROTL64 (21, X); /* row 0 done */
      X = A[17] ^ D[2]; A[18] = ROTL64 (15, X);
      X = A[11] ^ D[1]; A[17] = ROTL64 (10, X); /* row 3 done */
      X = A[ 7] ^ D[2]; A[11] = ROTL64 ( 6, X); /* row 1 done */
      X = A[10] ^ D[0]; A[ 7] = ROTL64 ( 3, X);
      A[10] = T;				/* row 2 done */

      D[0] = ~A[1] & A[2];
      D[1] = ~A[2] & A[3];
      D[2] = ~A[3] & A[4];
      D[3] = ~A[4] & A[0];
      D[4] = ~A[0] & A[1];

      A[0] ^= D[0] ^ rc[i]; C[0] = A[0];
      A[1] ^= D[1]; C[1] = A[1];
      A[2] ^= D[2]; C[2] = A[2];
      A[3] ^= D[3]; C[3] = A[3];
      A[4] ^= D[4]; C[4] = A[4];

      for (y = 5; y < 25; y+= 5)
	{
	  D[0] = ~A[y+1] & A[y+2];
	  D[1] = ~A[y+2] & A[y+3];
	  D[2] = ~A[y+3] & A[y+4];
	  D[3] = ~A[y+4] & A[y+0];
	  D[4] = ~A[y+0] & A[y+1];

	  A[y+0] ^= D[0]; C[0] ^= A[y+0];
	  A[y+1] ^= D[1]; C[1] ^= A[y+1];
	  A[y+2] ^= D[2]; C[2] ^= A[y+2];
	  A[y+3] ^= D[3]; C[3] ^= A[y+3];
	  A[y+4] ^= D[4]; C[4] ^= A[y+4];
	}
    }
#undef A
}