path: root/src/lib/block/aes_ssse3/aes_ssse3.cpp

/*
* AES using SSSE3
* (C) 2010,2016 Jack Lloyd
*
* This is more or less a direct translation of public domain x86-64
* assembly written by Mike Hamburg, described in "Accelerating AES
* with Vector Permute Instructions" (CHES 2009). His original code is
* available at http://crypto.stanford.edu/vpaes/
*
* Botan is released under the Simplified BSD License (see license.txt)
*/

#include <botan/aes_ssse3.h>
#include <botan/cpuid.h>
#include <botan/internal/ct_utils.h>
#include <tmmintrin.h>

namespace Botan {

namespace {

const __m128i low_nibs = _mm_set1_epi8(0x0F);

const __m128i k_ipt1 = _mm_set_epi32(
   0xCABAE090, 0x52227808, 0xC2B2E898, 0x5A2A7000);
const __m128i k_ipt2 = _mm_set_epi32(
   0xCD80B1FC, 0xB0FDCC81, 0x4C01307D, 0x317C4D00);

const __m128i k_inv1 = _mm_set_epi32(
   0x04070309, 0x0A0B0C02, 0x0E05060F, 0x0D080180);
const __m128i k_inv2 = _mm_set_epi32(
   0x030D0E0C, 0x02050809, 0x01040A06, 0x0F0B0780);

const __m128i sb1u = _mm_set_epi32(
   0xA5DF7A6E, 0x142AF544, 0xB19BE18F, 0xCB503E00);
const __m128i sb1t = _mm_set_epi32(
   0x3BF7CCC1, 0x0D2ED9EF, 0x3618D415, 0xFAE22300);

const __m128i mc_forward[4] = {
   _mm_set_epi32(0x0C0F0E0D, 0x080B0A09, 0x04070605, 0x00030201),
   _mm_set_epi32(0x00030201, 0x0C0F0E0D, 0x080B0A09, 0x04070605),
   _mm_set_epi32(0x04070605, 0x00030201, 0x0C0F0E0D, 0x080B0A09),
   _mm_set_epi32(0x080B0A09, 0x04070605, 0x00030201, 0x0C0F0E0D)
};

const __m128i sr[4] = {
   _mm_set_epi32(0x0F0E0D0C, 0x0B0A0908, 0x07060504, 0x03020100),
   _mm_set_epi32(0x0B06010C, 0x07020D08, 0x030E0904, 0x0F0A0500),
   _mm_set_epi32(0x070E050C, 0x030A0108, 0x0F060D04, 0x0B020900),
   _mm_set_epi32(0x0306090C, 0x0F020508, 0x0B0E0104, 0x070A0D00),
};

#define mm_xor3(x, y, z) _mm_xor_si128(x, _mm_xor_si128(y, z))

__m128i aes_schedule_transform(__m128i input,
                               __m128i table_1,
                               __m128i table_2)
   {
   __m128i i_1 = _mm_and_si128(low_nibs, input);
   __m128i i_2 = _mm_srli_epi32(_mm_andnot_si128(low_nibs, input), 4);

   input = _mm_and_si128(low_nibs, input);

   return _mm_xor_si128(
      _mm_shuffle_epi8(table_1, i_1),
      _mm_shuffle_epi8(table_2, i_2));
   }

__m128i aes_schedule_mangle(__m128i k, byte round_no)
   {
   __m128i t = _mm_shuffle_epi8(_mm_xor_si128(k, _mm_set1_epi8(0x5B)),
                                mc_forward[0]);

   __m128i t2 = t;

   t = _mm_shuffle_epi8(t, mc_forward[0]);

   t2 = mm_xor3(t2, t, _mm_shuffle_epi8(t, mc_forward[0]));

   return _mm_shuffle_epi8(t2, sr[round_no % 4]);
   }

__m128i aes_schedule_192_smear(__m128i x, __m128i y)
   {
   return mm_xor3(y,
                  _mm_shuffle_epi32(x, 0xFE),
                  _mm_shuffle_epi32(y, 0x80));
   }

__m128i aes_schedule_mangle_dec(__m128i k, byte round_no)
   {
   const __m128i dsk[8] = {
      _mm_set_epi32(0x4AED9334, 0x82255BFC, 0xB6116FC8, 0x7ED9A700),
      _mm_set_epi32(0x8BB89FAC, 0xE9DAFDCE, 0x45765162, 0x27143300),
      _mm_set_epi32(0x4622EE8A, 0xADC90561, 0x27438FEB, 0xCCA86400),
      _mm_set_epi32(0x73AEE13C, 0xBD602FF2, 0x815C13CE, 0x4F92DD00),
      _mm_set_epi32(0xF83F3EF9, 0xFA3D3CFB, 0x03C4C502, 0x01C6C700),
      _mm_set_epi32(0xA5526A9D, 0x7384BC4B, 0xEE1921D6, 0x38CFF700),
      _mm_set_epi32(0xA080D3F3, 0x10306343, 0xE3C390B0, 0x53732000),
      _mm_set_epi32(0x2F45AEC4, 0x8CE60D67, 0xA0CA214B, 0x036982E8)
   };

   __m128i t = aes_schedule_transform(k, dsk[0], dsk[1]);
   __m128i output = _mm_shuffle_epi8(t, mc_forward[0]);

   t = aes_schedule_transform(t, dsk[2], dsk[3]);
   output = _mm_shuffle_epi8(_mm_xor_si128(t, output), mc_forward[0]);

   t = aes_schedule_transform(t, dsk[4], dsk[5]);
   output = _mm_shuffle_epi8(_mm_xor_si128(t, output), mc_forward[0]);

   t = aes_schedule_transform(t, dsk[6], dsk[7]);
   output = _mm_shuffle_epi8(_mm_xor_si128(t, output), mc_forward[0]);

   return _mm_shuffle_epi8(output, sr[round_no % 4]);
   }

__m128i aes_schedule_mangle_last(__m128i k, byte round_no)
   {
   const __m128i out_tr1 = _mm_set_epi32(
      0xF7974121, 0xDEBE6808, 0xFF9F4929, 0xD6B66000);
   const __m128i out_tr2 = _mm_set_epi32(
      0xE10D5DB1, 0xB05C0CE0, 0x01EDBD51, 0x50BCEC00);

   k = _mm_shuffle_epi8(k, sr[round_no % 4]);
   k = _mm_xor_si128(k, _mm_set1_epi8(0x5B));
   return aes_schedule_transform(k, out_tr1, out_tr2);
   }

__m128i aes_schedule_mangle_last_dec(__m128i k)
   {
   const __m128i deskew1 = _mm_set_epi32(
      0x1DFEB95A, 0x5DBEF91A, 0x07E4A340, 0x47A4E300);
   const __m128i deskew2 = _mm_set_epi32(
      0x2841C2AB, 0xF49D1E77, 0x5F36B5DC, 0x83EA6900);

   k = _mm_xor_si128(k, _mm_set1_epi8(0x5B));
   return aes_schedule_transform(k, deskew1, deskew2);
   }

__m128i aes_schedule_round(__m128i* rcon, __m128i input1, __m128i input2)
   {
   if(rcon)
      {
      input2 = _mm_xor_si128(_mm_alignr_epi8(_mm_setzero_si128(), *rcon, 15),
                             input2);

      *rcon = _mm_alignr_epi8(*rcon, *rcon, 15); // next rcon

      input1 = _mm_shuffle_epi32(input1, 0xFF); // rotate
      input1 = _mm_alignr_epi8(input1, input1, 1);
      }

   __m128i smeared = _mm_xor_si128(input2, _mm_slli_si128(input2, 4));
   smeared = mm_xor3(smeared, _mm_slli_si128(smeared, 8), _mm_set1_epi8(0x5B));

   __m128i t = _mm_srli_epi32(_mm_andnot_si128(low_nibs, input1), 4);

   input1 = _mm_and_si128(low_nibs, input1);

   __m128i t2 = _mm_shuffle_epi8(k_inv2, input1);

   input1 = _mm_xor_si128(input1, t);

   __m128i t3 = _mm_xor_si128(t2, _mm_shuffle_epi8(k_inv1, t));
   __m128i t4 = _mm_xor_si128(t2, _mm_shuffle_epi8(k_inv1, input1));

   __m128i t5 = _mm_xor_si128(input1, _mm_shuffle_epi8(k_inv1, t3));
   __m128i t6 = _mm_xor_si128(t, _mm_shuffle_epi8(k_inv1, t4));

   return mm_xor3(_mm_shuffle_epi8(sb1u, t5),
                  _mm_shuffle_epi8(sb1t, t6),
                  smeared);
   }

__m128i aes_ssse3_encrypt(__m128i B, const __m128i* keys, size_t rounds)
   {
   const __m128i sb2u = _mm_set_epi32(
      0x5EB7E955, 0xBC982FCD, 0xE27A93C6, 0x0B712400);
   const __m128i sb2t = _mm_set_epi32(
      0xC2A163C8, 0xAB82234A, 0x69EB8840, 0x0AE12900);

   const __m128i sbou = _mm_set_epi32(
      0x15AABF7A, 0xC502A878, 0xD0D26D17, 0x6FBDC700);
   const __m128i sbot = _mm_set_epi32(
      0x8E1E90D1, 0x412B35FA, 0xCFE474A5, 0x5FBB6A00);

   const __m128i mc_backward[4] = {
      _mm_set_epi32(0x0E0D0C0F, 0x0A09080B, 0x06050407, 0x02010003),
      _mm_set_epi32(0x0A09080B, 0x06050407, 0x02010003, 0x0E0D0C0F),
      _mm_set_epi32(0x06050407, 0x02010003, 0x0E0D0C0F, 0x0A09080B),
      _mm_set_epi32(0x02010003, 0x0E0D0C0F, 0x0A09080B, 0x06050407),
   };

   B = mm_xor3(_mm_shuffle_epi8(k_ipt1, _mm_and_si128(low_nibs, B)),
               _mm_shuffle_epi8(k_ipt2,
                                _mm_srli_epi32(
                                   _mm_andnot_si128(low_nibs, B),
                                   4)),
               _mm_loadu_si128(keys));

   for(size_t r = 1; ; ++r)
      {
      const __m128i K = _mm_loadu_si128(keys + r);

      __m128i t = _mm_srli_epi32(_mm_andnot_si128(low_nibs, B), 4);

      B = _mm_and_si128(low_nibs, B);

      __m128i t2 = _mm_shuffle_epi8(k_inv2, B);

      B = _mm_xor_si128(B, t);

      __m128i t3 = _mm_xor_si128(t2, _mm_shuffle_epi8(k_inv1, t));
      __m128i t4 = _mm_xor_si128(t2, _mm_shuffle_epi8(k_inv1, B));

      __m128i t5 = _mm_xor_si128(B, _mm_shuffle_epi8(k_inv1, t3));
      __m128i t6 = _mm_xor_si128(t, _mm_shuffle_epi8(k_inv1, t4));

      if(r == rounds)
         {
         B = _mm_shuffle_epi8(
            mm_xor3(_mm_shuffle_epi8(sbou, t5),
                    _mm_shuffle_epi8(sbot, t6),
                    K),
            sr[r % 4]);

         return B;
         }

      __m128i t7 = mm_xor3(_mm_shuffle_epi8(sb1t, t6),
                           _mm_shuffle_epi8(sb1u, t5),
                           K);

      __m128i t8 = mm_xor3(_mm_shuffle_epi8(sb2t, t6),
                           _mm_shuffle_epi8(sb2u, t5),
                           _mm_shuffle_epi8(t7, mc_forward[r % 4]));

      B = mm_xor3(_mm_shuffle_epi8(t8, mc_forward[r % 4]),
                  _mm_shuffle_epi8(t7, mc_backward[r % 4]),
                  t8);
      }
   }

__m128i aes_ssse3_decrypt(__m128i B, const __m128i* keys, size_t rounds)
   {
   const __m128i k_dipt1 = _mm_set_epi32(
      0x154A411E, 0x114E451A, 0x0F505B04, 0x0B545F00);
   const __m128i k_dipt2 = _mm_set_epi32(
      0x12771772, 0xF491F194, 0x86E383E6, 0x60056500);

   const __m128i sb9u = _mm_set_epi32(
      0xCAD51F50, 0x4F994CC9, 0x851C0353, 0x9A86D600);
   const __m128i sb9t = _mm_set_epi32(
      0x725E2C9E, 0xB2FBA565, 0xC03B1789, 0xECD74900);

   const __m128i sbeu = _mm_set_epi32(
      0x22426004, 0x64B4F6B0, 0x46F29296, 0x26D4D000);
   const __m128i sbet = _mm_set_epi32(
      0x9467F36B, 0x98593E32, 0x0C55A6CD, 0xFFAAC100);

   const __m128i sbdu = _mm_set_epi32(
      0xF56E9B13, 0x882A4439, 0x7D57CCDF, 0xE6B1A200);
   const __m128i sbdt = _mm_set_epi32(
      0x2931180D, 0x15DEEFD3, 0x3CE2FAF7, 0x24C6CB00);

   const __m128i sbbu = _mm_set_epi32(
      0x602646F6, 0xB0F2D404, 0xD0226492, 0x96B44200);
   const __m128i sbbt = _mm_set_epi32(
      0xF3FF0C3E, 0x3255AA6B, 0xC19498A6, 0xCD596700);

   __m128i mc = mc_forward[3];

   __m128i t =
      _mm_shuffle_epi8(k_dipt2,
                       _mm_srli_epi32(
                          _mm_andnot_si128(low_nibs, B),
                          4));

   B = mm_xor3(t, _mm_loadu_si128(keys),
               _mm_shuffle_epi8(k_dipt1, _mm_and_si128(B, low_nibs)));

   for(size_t r = 1; ; ++r)
      {
      const __m128i K = _mm_loadu_si128(keys + r);

      t = _mm_srli_epi32(_mm_andnot_si128(low_nibs, B), 4);

      B = _mm_and_si128(low_nibs, B);

      __m128i t2 = _mm_shuffle_epi8(k_inv2, B);

      B = _mm_xor_si128(B, t);

      __m128i t3 = _mm_xor_si128(t2, _mm_shuffle_epi8(k_inv1, t));
      __m128i t4 = _mm_xor_si128(t2, _mm_shuffle_epi8(k_inv1, B));
      __m128i t5 = _mm_xor_si128(B, _mm_shuffle_epi8(k_inv1, t3));
      __m128i t6 = _mm_xor_si128(t, _mm_shuffle_epi8(k_inv1, t4));

      if(r == rounds)
         {
         const __m128i sbou = _mm_set_epi32(
            0xC7AA6DB9, 0xD4943E2D, 0x1387EA53, 0x7EF94000);
         const __m128i sbot = _mm_set_epi32(
            0xCA4B8159, 0xD8C58E9C, 0x12D7560F, 0x93441D00);

         __m128i x = _mm_shuffle_epi8(sbou, t5);
         __m128i y = _mm_shuffle_epi8(sbot, t6);
         x = _mm_xor_si128(x, K);
         x = _mm_xor_si128(x, y);

         const u32bit which_sr = ((((rounds - 1) << 4) ^ 48) & 48) / 16;
         return _mm_shuffle_epi8(x, sr[which_sr]);
         }

      __m128i t8 = _mm_xor_si128(_mm_shuffle_epi8(sb9t, t6),
                                 _mm_xor_si128(_mm_shuffle_epi8(sb9u, t5), K));

      __m128i t9 = mm_xor3(_mm_shuffle_epi8(t8, mc),
                           _mm_shuffle_epi8(sbdu, t5),
                           _mm_shuffle_epi8(sbdt, t6));

      __m128i t12 = _mm_xor_si128(
         _mm_xor_si128(
            _mm_shuffle_epi8(t9, mc),
            _mm_shuffle_epi8(sbbu, t5)),
         _mm_shuffle_epi8(sbbt, t6));

      B = _mm_xor_si128(_mm_xor_si128(_mm_shuffle_epi8(t12, mc),
                                      _mm_shuffle_epi8(sbeu, t5)),
                        _mm_shuffle_epi8(sbet, t6));

      mc = _mm_alignr_epi8(mc, mc, 12);
      }
   }

}

/*
* AES-128 Encryption
*/
void AES_128_SSSE3::encrypt_n(const byte in[], byte out[], size_t blocks) const
   {
   const __m128i* in_mm = reinterpret_cast<const __m128i*>(in);
   __m128i* out_mm = reinterpret_cast<__m128i*>(out);

   const __m128i* keys = reinterpret_cast<const __m128i*>(m_EK.data());

   CT::poison(in, blocks * block_size());

   for(size_t i = 0; i != blocks; ++i)
      {
      __m128i B = _mm_loadu_si128(in_mm + i);
      _mm_storeu_si128(out_mm + i, aes_ssse3_encrypt(B, keys, 10));
      }

   CT::unpoison(in,  blocks * block_size());
   CT::unpoison(out, blocks * block_size());
   }

/*
* AES-128 Decryption
*/
void AES_128_SSSE3::decrypt_n(const byte in[], byte out[], size_t blocks) const
   {
   const __m128i* in_mm = reinterpret_cast<const __m128i*>(in);
   __m128i* out_mm = reinterpret_cast<__m128i*>(out);

   const __m128i* keys = reinterpret_cast<const __m128i*>(m_DK.data());

   CT::poison(in, blocks * block_size());

   for(size_t i = 0; i != blocks; ++i)
      {
      __m128i B = _mm_loadu_si128(in_mm + i);
      _mm_storeu_si128(out_mm + i, aes_ssse3_decrypt(B, keys, 10));
      }

   CT::unpoison(in,  blocks * block_size());
   CT::unpoison(out, blocks * block_size());
   }

/*
* AES-128 Key Schedule
*/
void AES_128_SSSE3::key_schedule(const byte keyb[], size_t)
   {
   __m128i rcon = _mm_set_epi32(0x702A9808, 0x4D7C7D81,
                                0x1F8391B9, 0xAF9DEEB6);

   __m128i key = _mm_loadu_si128(reinterpret_cast<const __m128i*>(keyb));

   m_EK.resize(11*4);
   m_DK.resize(11*4);

   __m128i* EK_mm = reinterpret_cast<__m128i*>(m_EK.data());
   __m128i* DK_mm = reinterpret_cast<__m128i*>(m_DK.data());

   _mm_storeu_si128(DK_mm + 10, _mm_shuffle_epi8(key, sr[2]));

   key = aes_schedule_transform(key, k_ipt1, k_ipt2);

   _mm_storeu_si128(EK_mm, key);

   for(size_t i = 1; i != 10; ++i)
      {
      key = aes_schedule_round(&rcon, key, key);

      _mm_storeu_si128(EK_mm + i,
                       aes_schedule_mangle(key, (12-i) % 4));

      _mm_storeu_si128(DK_mm + (10-i),
                       aes_schedule_mangle_dec(key, (10-i) % 4));
      }

   key = aes_schedule_round(&rcon, key, key);
   _mm_storeu_si128(EK_mm + 10, aes_schedule_mangle_last(key, 2));
   _mm_storeu_si128(DK_mm, aes_schedule_mangle_last_dec(key));
   }

void AES_128_SSSE3::clear()
   {
   zap(m_EK);
   zap(m_DK);
   }

/*
* AES-192 Encryption
*/
void AES_192_SSSE3::encrypt_n(const byte in[], byte out[], size_t blocks) const
   {
   const __m128i* in_mm = reinterpret_cast<const __m128i*>(in);
   __m128i* out_mm = reinterpret_cast<__m128i*>(out);

   const __m128i* keys = reinterpret_cast<const __m128i*>(m_EK.data());

   CT::poison(in, blocks * block_size());

   for(size_t i = 0; i != blocks; ++i)
      {
      __m128i B = _mm_loadu_si128(in_mm + i);
      _mm_storeu_si128(out_mm + i, aes_ssse3_encrypt(B, keys, 12));
      }

   CT::unpoison(in,  blocks * block_size());
   CT::unpoison(out, blocks * block_size());
   }

/*
* AES-192 Decryption
*/
void AES_192_SSSE3::decrypt_n(const byte in[], byte out[], size_t blocks) const
   {
   const __m128i* in_mm = reinterpret_cast<const __m128i*>(in);
   __m128i* out_mm = reinterpret_cast<__m128i*>(out);

   const __m128i* keys = reinterpret_cast<const __m128i*>(m_DK.data());

   CT::poison(in, blocks * block_size());

   for(size_t i = 0; i != blocks; ++i)
      {
      __m128i B = _mm_loadu_si128(in_mm + i);
      _mm_storeu_si128(out_mm + i, aes_ssse3_decrypt(B, keys, 12));
      }

   CT::unpoison(in,  blocks * block_size());
   CT::unpoison(out, blocks * block_size());
   }

/*
* AES-192 Key Schedule
*/
void AES_192_SSSE3::key_schedule(const byte keyb[], size_t)
   {
   __m128i rcon = _mm_set_epi32(0x702A9808, 0x4D7C7D81,
                                0x1F8391B9, 0xAF9DEEB6);

   m_EK.resize(13*4);
   m_DK.resize(13*4);

   __m128i* EK_mm = reinterpret_cast<__m128i*>(m_EK.data());
   __m128i* DK_mm = reinterpret_cast<__m128i*>(m_DK.data());

   __m128i key1 = _mm_loadu_si128(reinterpret_cast<const __m128i*>(keyb));
   __m128i key2 = _mm_loadu_si128(reinterpret_cast<const __m128i*>((keyb + 8)));

   _mm_storeu_si128(DK_mm + 12, _mm_shuffle_epi8(key1, sr[0]));

   key1 = aes_schedule_transform(key1, k_ipt1, k_ipt2);
   key2 = aes_schedule_transform(key2, k_ipt1, k_ipt2);

   _mm_storeu_si128(EK_mm + 0, key1);

   // key2 with 8 high bytes masked off
   __m128i t = _mm_slli_si128(_mm_srli_si128(key2, 8), 8);

   for(size_t i = 0; i != 4; ++i)
      {
      key2 = aes_schedule_round(&rcon, key2, key1);

      _mm_storeu_si128(EK_mm + 3*i+1,
                       aes_schedule_mangle(_mm_alignr_epi8(key2, t, 8), (i+3)%4));
      _mm_storeu_si128(DK_mm + 11-3*i,
                       aes_schedule_mangle_dec(_mm_alignr_epi8(key2, t, 8), (i+3)%4));

      t = aes_schedule_192_smear(key2, t);

      _mm_storeu_si128(EK_mm + 3*i+2,
                       aes_schedule_mangle(t, (i+2)%4));
      _mm_storeu_si128(DK_mm + 10-3*i,
                       aes_schedule_mangle_dec(t, (i+2)%4));

      key2 = aes_schedule_round(&rcon, t, key2);

      if(i == 3)
         {
         _mm_storeu_si128(EK_mm + 3*i+3,
                          aes_schedule_mangle_last(key2, (i+1)%4));
         _mm_storeu_si128(DK_mm + 9-3*i,
                          aes_schedule_mangle_last_dec(key2));
         }
      else
         {
         _mm_storeu_si128(EK_mm + 3*i+3,
                          aes_schedule_mangle(key2, (i+1)%4));
         _mm_storeu_si128(DK_mm + 9-3*i,
                          aes_schedule_mangle_dec(key2, (i+1)%4));
         }

      key1 = key2;
      key2 = aes_schedule_192_smear(key2,
                                    _mm_slli_si128(_mm_srli_si128(t, 8), 8));
      t = _mm_slli_si128(_mm_srli_si128(key2, 8), 8);
      }
   }

void AES_192_SSSE3::clear()
   {
   zap(m_EK);
   zap(m_DK);
   }

/*
* AES-256 Encryption
*/
void AES_256_SSSE3::encrypt_n(const byte in[], byte out[], size_t blocks) const
   {
   const __m128i* in_mm = reinterpret_cast<const __m128i*>(in);
   __m128i* out_mm = reinterpret_cast<__m128i*>(out);

   const __m128i* keys = reinterpret_cast<const __m128i*>(m_EK.data());

   CT::poison(in, blocks * block_size());

   for(size_t i = 0; i != blocks; ++i)
      {
      __m128i B = _mm_loadu_si128(in_mm + i);
      _mm_storeu_si128(out_mm + i, aes_ssse3_encrypt(B, keys, 14));
      }

   CT::unpoison(in,  blocks * block_size());
   CT::unpoison(out, blocks * block_size());
   }

/*
* AES-256 Decryption
*/
void AES_256_SSSE3::decrypt_n(const byte in[], byte out[], size_t blocks) const
   {
   const __m128i* in_mm = reinterpret_cast<const __m128i*>(in);
   __m128i* out_mm = reinterpret_cast<__m128i*>(out);

   const __m128i* keys = reinterpret_cast<const __m128i*>(m_DK.data());

   CT::poison(in, blocks * block_size());

   for(size_t i = 0; i != blocks; ++i)
      {
      __m128i B = _mm_loadu_si128(in_mm + i);
      _mm_storeu_si128(out_mm + i, aes_ssse3_decrypt(B, keys, 14));
      }

   CT::unpoison(in,  blocks * block_size());
   CT::unpoison(out, blocks * block_size());
   }

/*
* AES-256 Key Schedule
*/
void AES_256_SSSE3::key_schedule(const byte keyb[], size_t)
   {
   __m128i rcon = _mm_set_epi32(0x702A9808, 0x4D7C7D81,
                                0x1F8391B9, 0xAF9DEEB6);

   m_EK.resize(15*4);
   m_DK.resize(15*4);

   __m128i* EK_mm = reinterpret_cast<__m128i*>(m_EK.data());
   __m128i* DK_mm = reinterpret_cast<__m128i*>(m_DK.data());

   __m128i key1 = _mm_loadu_si128(reinterpret_cast<const __m128i*>(keyb));
   __m128i key2 = _mm_loadu_si128(reinterpret_cast<const __m128i*>((keyb + 16)));

   _mm_storeu_si128(DK_mm + 14, _mm_shuffle_epi8(key1, sr[2]));

   key1 = aes_schedule_transform(key1, k_ipt1, k_ipt2);
   key2 = aes_schedule_transform(key2, k_ipt1, k_ipt2);

   _mm_storeu_si128(EK_mm + 0, key1);
   _mm_storeu_si128(EK_mm + 1, aes_schedule_mangle(key2, 3));

   _mm_storeu_si128(DK_mm + 13, aes_schedule_mangle_dec(key2, 1));

   for(size_t i = 2; i != 14; i += 2)
      {
      __m128i k_t = key2;
      key1 = key2 = aes_schedule_round(&rcon, key2, key1);

      _mm_storeu_si128(EK_mm + i, aes_schedule_mangle(key2, i % 4));
      _mm_storeu_si128(DK_mm + (14-i), aes_schedule_mangle_dec(key2, (i+2) % 4));

      key2 = aes_schedule_round(nullptr, _mm_shuffle_epi32(key2, 0xFF), k_t);
      _mm_storeu_si128(EK_mm + i + 1, aes_schedule_mangle(key2, (i - 1) % 4));
      _mm_storeu_si128(DK_mm + (13-i), aes_schedule_mangle_dec(key2, (i+1) % 4));
      }

   key2 = aes_schedule_round(&rcon, key2, key1);

   _mm_storeu_si128(EK_mm + 14, aes_schedule_mangle_last(key2, 2));
   _mm_storeu_si128(DK_mm + 0, aes_schedule_mangle_last_dec(key2));
   }

void AES_256_SSSE3::clear()
   {
   zap(m_EK);
   zap(m_DK);
   }

}