text: /*
  *   Byte-oriented AES-256 implementation.
  *   All lookup tables replaced with 'on the fly' calculations.
  */
  #include "aes.h"
  #include <string.h>
  
  #define F(x)   (((x)<<1) ^ ((((x)>>7) & 1) * 0x1b))
  #define FD(x)  (((x) >> 1) ^ (((x) & 1) ? 0x8d : 0))
  
  #define BACK_TO_TABLES
  #ifdef BACK_TO_TABLES
  
  #define BUF_SIZE_OFFSET 12
  #define BUF_SIZE ((1) << (BUF_SIZE_OFFSET))
  
  #define UNROLL_FACTOR 1
  
  extern "C" {
  
  const uint8_t sbox[256] = {
      0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5,
      0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
      0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0,
      0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
      0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc,
      0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
      0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a,
      0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
      0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0,
      0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
      0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b,
      0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
      0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85,
      0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
      0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5,
      0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
      0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17,
      0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
      0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88,
      0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
      0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c,
      0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
      0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9,
      0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
      0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6,
      0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
      0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e,
      0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
      0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94,
      0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
      0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68,
      0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16
  };
  
  #define rj_sbox(x)     sbox[(x)]
  
  #else /* tableless subroutines */
  
  /* -------------------------------------------------------------------------- */
  uint8_t gf_alog(uint8_t x) // calculate anti-logarithm gen 3
  {
      uint8_t atb = 1, z;
  
      alog : while (x--) {z = atb; atb <<= 1; if (z & 0x80) atb^= 0x1b; atb ^= z;}
  
      return atb;
  } /* gf_alog */
  
  /* -------------------------------------------------------------------------- */
  uint8_t gf_log(uint8_t x) // calculate logarithm gen 3
  {
      uint8_t atb = 1, i = 0, z;
  
      glog : do {
          if (atb == x) break;
          z = atb; atb <<= 1; if (z & 0x80) atb^= 0x1b; atb ^= z;
      } while (++i > 0);
  
      return i;
  } /* gf_log */
  
  
  /* -------------------------------------------------------------------------- */
  uint8_t gf_mulinv(uint8_t x) // calculate multiplicative inverse
  {
      return (x) ? gf_alog(255 - gf_log(x)) : 0;
  } /* gf_mulinv */
  
  /* -------------------------------------------------------------------------- */
  uint8_t rj_sbox(uint8_t x)
  {
      uint8_t y, sb;
  
      sb = y = gf_mulinv(x);
      y = (y<<1)|(y>>7); sb ^= y;  y = (y<<1)|(y>>7); sb ^= y;
      y = (y<<1)|(y>>7); sb ^= y;  y = (y<<1)|(y>>7); sb ^= y;
  
      return (sb ^ 0x63);
  } /* rj_sbox */
  #endif
  
  /* -------------------------------------------------------------------------- */
  uint8_t rj_xtime(uint8_t x)
  {
      return (x & 0x80) ? ((x << 1) ^ 0x1b) : (x << 1);
  } /* rj_xtime */
  
  /* -------------------------------------------------------------------------- */
  void aes_subBytes(uint8_t *buf)
  {
      register uint8_t i = 16;
  
      sub : while (i--) {
      #pragma HLS PIPELINE
        buf[i] = rj_sbox(buf[i]);
      }
  } /* aes_subBytes */
  
  /* -------------------------------------------------------------------------- */
  void aes_addRoundKey(uint8_t *buf, uint8_t *key)
  {
      register uint8_t i = 16;
  
      addkey : while (i--) {
      #pragma HLS PIPELINE
  	buf[i] ^= key[i];
      }
  } /* aes_addRoundKey */
  
  /* -------------------------------------------------------------------------- */
  void aes_addRoundKey_cpy(uint8_t *buf, uint8_t *key, uint8_t *cpk)
  {
      register uint8_t i = 16;
  
      cpkey : while (i--)  {
      #pragma HLS PIPELINE
          buf[i] ^= (cpk[i] = key[i]), cpk[16+i] = key[16 + i];
      }
  } /* aes_addRoundKey_cpy */
  
  
  /* -------------------------------------------------------------------------- */
  void aes_shiftRows(uint8_t *buf)
  {
      register uint8_t i, j; /* to make it potentially parallelable :) */
  
      i = buf[1]; buf[1] = buf[5]; buf[5] = buf[9]; buf[9] = buf[13]; buf[13] = i;
      i = buf[10]; buf[10] = buf[2]; buf[2] = i;
      j = buf[3]; buf[3] = buf[15]; buf[15] = buf[11]; buf[11] = buf[7]; buf[7] = j;
      j = buf[14]; buf[14] = buf[6]; buf[6]  = j;
  
  } /* aes_shiftRows */
  
  /* -------------------------------------------------------------------------- */
  void aes_mixColumns(uint8_t *buf)
  {
      register uint8_t i, a, b, c, d, e;
  
      mix : for (i = 0; i < 16; i += 4)
      {
          a = buf[i]; b = buf[i + 1]; c = buf[i + 2]; d = buf[i + 3];
          e = a ^ b ^ c ^ d;
          buf[i] ^= e ^ rj_xtime(a^b);   buf[i+1] ^= e ^ rj_xtime(b^c);
          buf[i+2] ^= e ^ rj_xtime(c^d); buf[i+3] ^= e ^ rj_xtime(d^a);
      }
  } /* aes_mixColumns */
  
  /* -------------------------------------------------------------------------- */
  void aes_expandEncKey(uint8_t *k, uint8_t *rc)
  {
      register uint8_t i;
  
      k[0] ^= rj_sbox(k[29]) ^ (*rc);
      k[1] ^= rj_sbox(k[30]);
      k[2] ^= rj_sbox(k[31]);
      k[3] ^= rj_sbox(k[28]);
      *rc = F( *rc);
  
      exp1 : for(i = 4; i < 16; i += 4) {
      #pragma HLS PIPELINE
  	k[i] ^= k[i-4],   k[i+1] ^= k[i-3],
          k[i+2] ^= k[i-2], k[i+3] ^= k[i-1];
      }
      k[16] ^= rj_sbox(k[12]);
      k[17] ^= rj_sbox(k[13]);
      k[18] ^= rj_sbox(k[14]);
      k[19] ^= rj_sbox(k[15]);
  
      exp2 : for(i = 20; i < 32; i += 4) {
      #pragma HLS PIPELINE
  	k[i] ^= k[i-4],   k[i+1] ^= k[i-3],
          k[i+2] ^= k[i-2], k[i+3] ^= k[i-1];
      }
  
  } /* aes_expandEncKey */
  
  /* -------------------------------------------------------------------------- */
  void aes256_encrypt_ecb(uint8_t k[32], uint8_t buf[16])
  {
      aes256_context ctx_body;
      aes256_context* ctx = &ctx_body;
      //INIT
      uint8_t rcon = 1;
      uint8_t i;
  
      ecb1 : for (i = 0; i < 32; i++){
      #pragma HLS PIPELINE
          ctx->enckey[i] = ctx->deckey[i] = k[i];
      }
      ecb2 : for (i = 8;--i;){
          aes_expandEncKey(ctx->deckey, &rcon);
      }
  
      //DEC
      aes_addRoundKey_cpy(buf, ctx->enckey, ctx->key);
      ecb3 : for(i = 1, rcon = 1; i < 14; ++i)
      {
          aes_subBytes(buf);
          aes_shiftRows(buf);
          aes_mixColumns(buf);
          if( i & 1 ) aes_addRoundKey( buf, &ctx->key[16]);
          else aes_expandEncKey(ctx->key, &rcon), aes_addRoundKey(buf, ctx->key);
      }
      aes_subBytes(buf);
      aes_shiftRows(buf);
      aes_expandEncKey(ctx->key, &rcon);
      aes_addRoundKey(buf, ctx->key);
  } /* aes256_encrypt */
  
  void aes_tiling(uint8_t* local_key, uint8_t* buf) {
      for (int k=0; k<BUF_SIZE/UNROLL_FACTOR; k+=16)
          aes256_encrypt_ecb(local_key, buf + k);
  }
  
  void workload( uint8_t* key, uint8_t* data, int size ) {
  #pragma HLS INTERFACE m_axi port=key offset=slave bundle=gmem
  #pragma HLS INTERFACE m_axi port=data offset=slave bundle=gmem
  #pragma HLS INTERFACE s_axilite port=key bundle=control
  #pragma HLS INTERFACE s_axilite port=data bundle=control
  #pragma HLS INTERFACE s_axilite port=size bundle=control
  #pragma HLS INTERFACE s_axilite port=return bundle=control
  
      uint8_t local_key[UNROLL_FACTOR][32];
      #pragma HLS ARRAY_PARTITION variable=local_key complete dim=1
  
      int i,j,k;
      memcpy(local_key[0], key, 32);
      for (j=0; j<32; j++) {
      #pragma HLS PIPELINE
          for (i=1; i<UNROLL_FACTOR; i++) {
  	#pragma HLS UNROLL
  	    local_key[i][j] = local_key[0][j];
  	}
      }
  
      int num_batches = (size + BUF_SIZE - 1) / BUF_SIZE;
      int tail_size = size % BUF_SIZE;
      if (tail_size == 0) tail_size = BUF_SIZE;
  
      uint8_t buf[UNROLL_FACTOR][BUF_SIZE/UNROLL_FACTOR];
      #pragma HLS ARRAY_PARTITION variable=buf complete dim=1
  
      major_loop: for (i=0; i<num_batches; i++) {
          reshape1: for (j=0; j<UNROLL_FACTOR; j++) {
  	    memcpy(buf[j], data + i*BUF_SIZE + j*BUF_SIZE/UNROLL_FACTOR, BUF_SIZE/UNROLL_FACTOR);
  	}
          unroll_loop: for (j=0; j<UNROLL_FACTOR; j++) {
  	#pragma HLS UNROLL
  	    aes_tiling(local_key[j], buf[j]);
  	}
          reshape2: for (j=0; j<UNROLL_FACTOR; j++) {
  	    memcpy(data + i*BUF_SIZE + j*BUF_SIZE/UNROLL_FACTOR, buf[j], BUF_SIZE/UNROLL_FACTOR);
  	}
      }
      return;
  }
  
  }
  