text: // Copyright (c) 2012-2013 The Cryptonote developers
  // Distributed under the MIT/X11 software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  // Portions Copyright (c) 2018 The Monero developers
  // Portions Copyright (c) 2018 The darkCoin Developers
  
  #include <stdio.h>
  #include <stdlib.h>
  #include "crypto/oaes_lib.h"
  #include "crypto/c_keccak.h"
  #include "crypto/c_groestl.h"
  #include "crypto/c_blake256.h"
  #include "crypto/c_jh.h"
  #include "crypto/c_skein.h"
  #include "crypto/int-util.h"
  #include "crypto/hash-ops.h"
  #include "crypto/variant2_int_sqrt.h"
  
  #if defined(_MSC_VER)
  #include <malloc.h>
  #endif
  #if defined(__APPLE__)
  #include <unistd.h>
  #endif
  #define MEMORY          524288 /* 512KB - 2^19 */
  #define ITER            262144 /* 2^18 */
  #define ITER_DIV        131072 /* 2^17 */
  #define AES_BLOCK_SIZE  16
  #define AES_KEY_SIZE    32 /*16*/
  #define INIT_SIZE_BLK   8
  #define INIT_SIZE_BYTE  (INIT_SIZE_BLK * AES_BLOCK_SIZE)
  #define CN_INIT         (MEMORY / INIT_SIZE_BYTE)
  #define CN_AES_INIT     (MEMORY / AES_BLOCK_SIZE) / 2
  
  #define VARIANT1_1(p) \
    do if (variant == 1) \
    { \
      const uint8_t tmp = ((const uint8_t*)(p))[11]; \
      static const uint32_t table = 0x75310; \
      const uint8_t index = (((tmp >> 3) & 6) | (tmp & 1)) << 1; \
      ((uint8_t*)(p))[11] = tmp ^ ((table >> index) & 0x30); \
    } while(0)
  
  #define VARIANT1_2(p) \
     do if (variant == 1) \
     { \
       ((uint64_t*)p)[1] ^= tweak1_2; \
     } while(0)
  
  #define VARIANT1_INIT() \
    if (variant == 1 && len < 43) \
    { \
      fprintf(stderr, "Cryptonight variant 1 needs at least 43 bytes of data"); \
      _exit(1); \
    } \
    const uint64_t tweak1_2 = (variant == 1) ? *(const uint64_t*)(((const uint8_t*)input)+35) ^ ctx->state.hs.w[24] : 0
  
  #define U64(p) ((uint64_t*)(p))
  
  #define VARIANT2_INIT(b, state) \
    uint64_t division_result; \
    uint64_t sqrt_result; \
    do if (variant >= 2) \
    { \
      U64(b)[2] = state.hs.w[8] ^ state.hs.w[10]; \
      U64(b)[3] = state.hs.w[9] ^ state.hs.w[11]; \
      division_result = state.hs.w[12]; \
      sqrt_result = state.hs.w[13]; \
    } while (0)
  
  #define VARIANT2_SHUFFLE_ADD(base_ptr, offset, a, b) \
    do if (variant >= 2) \
    { \
      uint64_t* chunk1 = U64((base_ptr) + ((offset) ^ 0x10)); \
      uint64_t* chunk2 = U64((base_ptr) + ((offset) ^ 0x20)); \
      uint64_t* chunk3 = U64((base_ptr) + ((offset) ^ 0x30)); \
      \
      const uint64_t chunk1_old[2] = { chunk1[0], chunk1[1] }; \
      \
      chunk1[0] = chunk3[0] + U64(b + 16)[0]; \
      chunk1[1] = chunk3[1] + U64(b + 16)[1]; \
      \
      chunk3[0] = chunk2[0] + U64(a)[0]; \
      chunk3[1] = chunk2[1] + U64(a)[1]; \
      \
      chunk2[0] = chunk1_old[0] + U64(b)[0]; \
      chunk2[1] = chunk1_old[1] + U64(b)[1]; \
    } while (0)
  
  #define VARIANT2_INTEGER_MATH_DIVISION_STEP(b, ptr) \
    ((uint64_t*)(b))[0] ^= division_result ^ (sqrt_result << 32); \
    { \
      const uint64_t dividend = ((uint64_t*)(ptr))[1]; \
      const uint32_t divisor = (((uint32_t*)(ptr))[0] + (uint32_t)(sqrt_result << 1)) | 0x80000001UL; \
      division_result = ((uint32_t)(dividend / divisor)) + \
                       (((uint64_t)(dividend % divisor)) << 32); \
    } \
    const uint64_t sqrt_input = ((uint64_t*)(ptr))[0] + division_result
  
  #define VARIANT2_INTEGER_MATH(b, ptr) \
      do if (variant >= 2) \
      { \
        VARIANT2_INTEGER_MATH_DIVISION_STEP(b, ptr); \
        VARIANT2_INTEGER_MATH_SQRT_STEP_FP64(); \
        VARIANT2_INTEGER_MATH_SQRT_FIXUP(sqrt_result); \
      } while (0)
  
  #define VARIANT2_2() \
    do if (variant >= 2) { \
      ((uint64_t*)(ctx->long_state + ((j * AES_BLOCK_SIZE) ^ 0x10)))[0] ^= hi; \
      ((uint64_t*)(ctx->long_state + ((j * AES_BLOCK_SIZE) ^ 0x10)))[1] ^= lo; \
      hi ^= ((uint64_t*)(ctx->long_state + ((j * AES_BLOCK_SIZE) ^ 0x20)))[0]; \
      lo ^= ((uint64_t*)(ctx->long_state + ((j * AES_BLOCK_SIZE) ^ 0x20)))[1]; \
    } while (0)
  
  #pragma pack(push, 1)
  union cn_slow_hash_state {
      union hash_state hs;
      struct {
          uint8_t k[64];
          uint8_t init[INIT_SIZE_BYTE];
      };
  };
  #pragma pack(pop)
  
  static void do_dark_lite_blake_hash(const void* input, size_t len, char* output) {
      blake256_hash((uint8_t*)output, input, len);
  }
  
  void do_dark_lite_groestl_hash(const void* input, size_t len, char* output) {
      groestl(input, len * 8, (uint8_t*)output);
  }
  
  static void do_dark_lite_jh_hash(const void* input, size_t len, char* output) {
      int r = jh_hash(HASH_SIZE * 8, input, 8 * len, (uint8_t*)output);
      assert(SUCCESS == r);
  }
  
  static void do_dark_lite_skein_hash(const void* input, size_t len, char* output) {
      int r = c_skein_hash(8 * HASH_SIZE, input, 8 * len, (uint8_t*)output);
      assert(SKEIN_SUCCESS == r);
  }
  
  static void (* const extra_hashes[4])(const void *, size_t, char *) = {
      do_dark_lite_blake_hash, do_dark_lite_groestl_hash, do_dark_lite_jh_hash, do_dark_lite_skein_hash
  };
  
  extern int aesb_single_round(const uint8_t *in, uint8_t*out, const uint8_t *expandedKey);
  extern int aesb_pseudo_round(const uint8_t *in, uint8_t *out, const uint8_t *expandedKey);
  
  static inline size_t e2i(const uint8_t* a) {
      return (*((uint64_t*) a) / AES_BLOCK_SIZE) & (CN_AES_INIT - 1);
  }
  
  static void mul(const uint8_t* a, const uint8_t* b, uint8_t* res) {
      ((uint64_t*) res)[1] = mul128(((uint64_t*) a)[0], ((uint64_t*) b)[0], (uint64_t*) res);
  }
  
  static void sum_half_blocks(uint8_t* a, const uint8_t* b) {
      uint64_t a0, a1, b0, b1;
  
      a0 = SWAP64LE(((uint64_t*) a)[0]);
      a1 = SWAP64LE(((uint64_t*) a)[1]);
      b0 = SWAP64LE(((uint64_t*) b)[0]);
      b1 = SWAP64LE(((uint64_t*) b)[1]);
      a0 += b0;
      a1 += b1;
      ((uint64_t*) a)[0] = SWAP64LE(a0);
      ((uint64_t*) a)[1] = SWAP64LE(a1);
  }
  
  static inline void copy_block(uint8_t* dst, const uint8_t* src) {
      ((uint64_t*) dst)[0] = ((uint64_t*) src)[0];
      ((uint64_t*) dst)[1] = ((uint64_t*) src)[1];
  }
  
  static void swap_blocks(uint8_t* a, uint8_t* b) {
      size_t i;
      uint8_t t;
      for (i = 0; i < AES_BLOCK_SIZE; i++) {
          t = a[i];
          a[i] = b[i];
          b[i] = t;
      }
  }
  
  static inline void xor_blocks(uint8_t* a, const uint8_t* b) {
      ((uint64_t*) a)[0] ^= ((uint64_t*) b)[0];
      ((uint64_t*) a)[1] ^= ((uint64_t*) b)[1];
  }
  
  static inline void xor_blocks_dst(const uint8_t* a, const uint8_t* b, uint8_t* dst) {
      ((uint64_t*) dst)[0] = ((uint64_t*) a)[0] ^ ((uint64_t*) b)[0];
      ((uint64_t*) dst)[1] = ((uint64_t*) a)[1] ^ ((uint64_t*) b)[1];
  }
  
  struct cryptonightdarklite_ctx {
      uint8_t long_state[MEMORY];
      union cn_slow_hash_state state;
      uint8_t text[INIT_SIZE_BYTE];
      uint8_t a[AES_BLOCK_SIZE];
      uint8_t b[AES_BLOCK_SIZE * 2];
      uint8_t c[AES_BLOCK_SIZE];
      uint8_t aes_key[AES_KEY_SIZE];
      oaes_ctx* aes_ctx;
  };
  
  void cryptonightdarklite_hash(const char* input, char* output, uint32_t len, int variant) {
  #if defined(_MSC_VER)
      struct cryptonightdarklite_ctx *ctx = _malloca(sizeof(struct cryptonightdarklite_ctx));
  #else
      #if defined(__APPLE__)
          struct cryptonightdarklite_ctx *ctx = calloc(sizeof(struct cryptonightdarklite_ctx), sizeof(uint32_t));
      #else
          struct cryptonightdarklite_ctx *ctx = malloc(sizeof(struct cryptonightdarklite_ctx));
      #endif
  #endif
      hash_process(&ctx->state.hs, (const uint8_t*) input, len);
      memcpy(ctx->text, ctx->state.init, INIT_SIZE_BYTE);
      memcpy(ctx->aes_key, ctx->state.hs.b, AES_KEY_SIZE);
      ctx->aes_ctx = (oaes_ctx*) oaes_alloc();
      size_t i, j;
  
      VARIANT1_INIT();
      VARIANT2_INIT(ctx->b, ctx->state);
  
      oaes_key_import_data(ctx->aes_ctx, ctx->aes_key, AES_KEY_SIZE);
      for (i = 0; i < CN_INIT; i++) {
          for (j = 0; j < INIT_SIZE_BLK; j++) {
              aesb_pseudo_round(&ctx->text[AES_BLOCK_SIZE * j],
                      &ctx->text[AES_BLOCK_SIZE * j],
                      ctx->aes_ctx->key->exp_data);
          }
          memcpy(&ctx->long_state[i * INIT_SIZE_BYTE], ctx->text, INIT_SIZE_BYTE);
      }
  
      for (i = 0; i < 16; i++) {
          ctx->a[i] = ctx->state.k[i] ^ ctx->state.k[32 + i];
          ctx->b[i] = ctx->state.k[16 + i] ^ ctx->state.k[48 + i];
      }
  
      for (i = 0; i < ITER_DIV; i++) {
          /* Dependency chain: address -> read value ------+
           * written value <-+ hard function (AES or MUL) <+
           * next address  <-+
           */
          /* Iteration 1 */
          j = e2i(ctx->a);
          aesb_single_round(&ctx->long_state[j * AES_BLOCK_SIZE], ctx->c, ctx->a);
          VARIANT2_SHUFFLE_ADD(ctx->long_state, j * AES_BLOCK_SIZE, ctx->a, ctx->b);
          xor_blocks_dst(ctx->c, ctx->b, &ctx->long_state[j * AES_BLOCK_SIZE]);
          VARIANT1_1((uint8_t*)&ctx->long_state[j * AES_BLOCK_SIZE]);
          /* Iteration 2 */
          j = e2i(ctx->c);
  
          uint64_t* dst = (uint64_t*)&ctx->long_state[j * AES_BLOCK_SIZE];
  
          uint64_t t[2];
          t[0] = dst[0];
          t[1] = dst[1];
  
          VARIANT2_INTEGER_MATH(t, ctx->c);
  
          uint64_t hi;
          uint64_t lo = mul128(((uint64_t*)ctx->c)[0], t[0], &hi);
  
          VARIANT2_2();
          VARIANT2_SHUFFLE_ADD(ctx->long_state, j * AES_BLOCK_SIZE, ctx->a, ctx->b);
  
          ((uint64_t*)ctx->a)[0] += hi;
          ((uint64_t*)ctx->a)[1] += lo;
  
          dst[0] = ((uint64_t*)ctx->a)[0];
          dst[1] = ((uint64_t*)ctx->a)[1];
  
          ((uint64_t*)ctx->a)[0] ^= t[0];
          ((uint64_t*)ctx->a)[1] ^= t[1];
  
          VARIANT1_2((uint8_t*)&ctx->long_state[j * AES_BLOCK_SIZE]);
          copy_block(ctx->b + AES_BLOCK_SIZE, ctx->b);
          copy_block(ctx->b, ctx->c);
      }
  
      memcpy(ctx->text, ctx->state.init, INIT_SIZE_BYTE);
      oaes_key_import_data(ctx->aes_ctx, &ctx->state.hs.b[32], AES_KEY_SIZE);
      for (i = 0; i < CN_INIT; i++) {
          for (j = 0; j < INIT_SIZE_BLK; j++) {
              xor_blocks(&ctx->text[j * AES_BLOCK_SIZE],
                      &ctx->long_state[i * INIT_SIZE_BYTE + j * AES_BLOCK_SIZE]);
              aesb_pseudo_round(&ctx->text[j * AES_BLOCK_SIZE],
                      &ctx->text[j * AES_BLOCK_SIZE],
                      ctx->aes_ctx->key->exp_data);
          }
      }
      memcpy(ctx->state.init, ctx->text, INIT_SIZE_BYTE);
      hash_permutation(&ctx->state.hs);
      /*memcpy(hash, &state, 32);*/
      extra_hashes[ctx->state.hs.b[0] & 3](&ctx->state, 200, output);
      oaes_free((OAES_CTX **) &ctx->aes_ctx);
      free(ctx);
  }
  
  void cryptonightdarklite_fast_hash(const char* input, char* output, uint32_t len) {
      union hash_state state;
      hash_process(&state, (const uint8_t*) input, len);
      memcpy(output, &state, HASH_SIZE);
  }
  