text: /* crypto/aes/aes.h -*- mode:C; c-file-style: "eay" -*- */
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  #ifndef LIBGARBLE_AES_H
  #define LIBGARBLE_AES_H
  
  #include "block.h"
      
  typedef struct { block rd_key[11]; unsigned int rounds; } AES_KEY;
  
  #define EXPAND_ASSIST(v1,v2,v3,v4,shuff_const,aes_const)                    \
      v2 = _mm_aeskeygenassist_si128(v4,aes_const);                           \
      v3 = _mm_castps_si128(_mm_shuffle_ps(_mm_castsi128_ps(v3),              \
                                           _mm_castsi128_ps(v1), 16));        \
      v1 = _mm_xor_si128(v1,v3);                                              \
      v3 = _mm_castps_si128(_mm_shuffle_ps(_mm_castsi128_ps(v3),              \
                                           _mm_castsi128_ps(v1), 140));       \
      v1 = _mm_xor_si128(v1,v3);                                              \
      v2 = _mm_shuffle_epi32(v2,shuff_const);                                 \
      v1 = _mm_xor_si128(v1,v2)
  
  static inline void
  AES_set_encrypt_key(const block userkey, AES_KEY *key)
  {
      block x0, x1, x2;
      block *kp = key->rd_key;
      kp[0] = x0 = userkey;
      x2 = _mm_setzero_si128();
      EXPAND_ASSIST(x0, x1, x2, x0, 255, 1);
      kp[1] = x0;
      EXPAND_ASSIST(x0, x1, x2, x0, 255, 2);
      kp[2] = x0;
      EXPAND_ASSIST(x0, x1, x2, x0, 255, 4);
      kp[3] = x0;
      EXPAND_ASSIST(x0, x1, x2, x0, 255, 8);
      kp[4] = x0;
      EXPAND_ASSIST(x0, x1, x2, x0, 255, 16);
      kp[5] = x0;
      EXPAND_ASSIST(x0, x1, x2, x0, 255, 32);
      kp[6] = x0;
      EXPAND_ASSIST(x0, x1, x2, x0, 255, 64);
      kp[7] = x0;
      EXPAND_ASSIST(x0, x1, x2, x0, 255, 128);
      kp[8] = x0;
      EXPAND_ASSIST(x0, x1, x2, x0, 255, 27);
      kp[9] = x0;
      EXPAND_ASSIST(x0, x1, x2, x0, 255, 54);
      kp[10] = x0;
      key->rounds = 10;
  }
  
  static inline void
  AES_ecb_encrypt_blks(block *blks, unsigned int nblks, const AES_KEY *key)
  {
      for (unsigned int i = 0; i < nblks; ++i)
          blks[i] = _mm_xor_si128(blks[i], key->rd_key[0]);
      for (unsigned int j = 1; j < key->rounds; ++j)
          for (unsigned int i = 0; i < nblks; ++i)
              blks[i] = _mm_aesenc_si128(blks[i], key->rd_key[j]);
      for (unsigned int i = 0; i < nblks; ++i)
          blks[i] = _mm_aesenclast_si128(blks[i], key->rd_key[key->rounds]);
  }
  
  static inline void
  AES_set_decrypt_key_fast(AES_KEY *dkey, const AES_KEY *ekey)
  {
      int j = 0;
      int i = ekey->rounds;
  #if (OCB_KEY_LEN == 0)
      dkey->rounds = i;
  #endif
      dkey->rd_key[i--] = ekey->rd_key[j++];
      while (i)
          dkey->rd_key[i--] = _mm_aesimc_si128(ekey->rd_key[j++]);
      dkey->rd_key[i] = ekey->rd_key[j];
  }
  
  static inline void
  AES_set_decrypt_key(block userkey, AES_KEY *key)
  {
      AES_KEY temp_key;
      AES_set_encrypt_key(userkey, &temp_key);
      AES_set_decrypt_key_fast(key, &temp_key);
  }
  
  static inline void
  AES_ecb_decrypt_blks(block *blks, unsigned nblks, const AES_KEY *key)
  {
      unsigned i, j, rnds = key->rounds;
      for (i = 0; i < nblks; ++i)
          blks[i] = _mm_xor_si128(blks[i], key->rd_key[0]);
      for (j = 1; j < rnds; ++j)
          for (i = 0; i < nblks; ++i)
              blks[i] = _mm_aesdec_si128(blks[i], key->rd_key[j]);
      for (i = 0; i < nblks; ++i)
          blks[i] = _mm_aesdeclast_si128(blks[i], key->rd_key[j]);
  }
  
  #endif
  