blockchain/tests/functional_tests/sha3.cpp

// code from tiny_sha3 project
// distibuted under MIT license:
// The MIT License(MIT)
// 
// Copyright(c) 2015 Markku - Juhani O.Saarinen
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files(the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions :
// 
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
#include <iostream>
#include <iomanip>
using namespace std;

#ifndef KECCAKF_ROUNDS
#define KECCAKF_ROUNDS 24
#endif

#ifndef ROTL64
#define ROTL64(x, y) (((x) << (y)) | ((x) >> (64 - (y))))
#endif

// state context
typedef struct {
  union {                                 // state:
    uint8_t b[200];                     // 8-bit bytes
    uint64_t q[25];                     // 64-bit words
  } st;
  int pt, rsiz, mdlen;                    // these don't overflow
} sha3_ctx_t;


void sha3_keccakf(uint64_t st[25])
{
  // constants
  const uint64_t keccakf_rndc[24] = {
      0x0000000000000001, 0x0000000000008082, 0x800000000000808a,
      0x8000000080008000, 0x000000000000808b, 0x0000000080000001,
      0x8000000080008081, 0x8000000000008009, 0x000000000000008a,
      0x0000000000000088, 0x0000000080008009, 0x000000008000000a,
      0x000000008000808b, 0x800000000000008b, 0x8000000000008089,
      0x8000000000008003, 0x8000000000008002, 0x8000000000000080,
      0x000000000000800a, 0x800000008000000a, 0x8000000080008081,
      0x8000000000008080, 0x0000000080000001, 0x8000000080008008
  };
  const int keccakf_rotc[24] = {
      1,  3,  6,  10, 15, 21, 28, 36, 45, 55, 2,  14,
      27, 41, 56, 8,  25, 43, 62, 18, 39, 61, 20, 44
  };
  const int keccakf_piln[24] = {
      10, 7,  11, 17, 18, 3, 5,  16, 8,  21, 24, 4,
      15, 23, 19, 13, 12, 2, 20, 14, 22, 9,  6,  1
  };

  // variables
  int i, j, r;
  uint64_t t, bc[5];

#if __BYTE_ORDER__ != __ORDER_LITTLE_ENDIAN__
  uint8_t *v;

  // endianess conversion. this is redundant on little-endian targets
  for (i = 0; i < 25; i++) {
    v = (uint8_t *)&st[i];
    st[i] = ((uint64_t)v[0]) | (((uint64_t)v[1]) << 8) |
      (((uint64_t)v[2]) << 16) | (((uint64_t)v[3]) << 24) |
      (((uint64_t)v[4]) << 32) | (((uint64_t)v[5]) << 40) |
      (((uint64_t)v[6]) << 48) | (((uint64_t)v[7]) << 56);
  }
#endif

  // actual iteration
  for (r = 0; r < KECCAKF_ROUNDS; r++) {

    // Theta
    for (i = 0; i < 5; i++)
      bc[i] = st[i] ^ st[i + 5] ^ st[i + 10] ^ st[i + 15] ^ st[i + 20];

    for (i = 0; i < 5; i++) {
      t = bc[(i + 4) % 5] ^ ROTL64(bc[(i + 1) % 5], 1);
      for (j = 0; j < 25; j += 5)
        st[j + i] ^= t;
    }

    // Rho Pi
    t = st[1];
    for (i = 0; i < 24; i++) {
      j = keccakf_piln[i];
      bc[0] = st[j];
      st[j] = ROTL64(t, keccakf_rotc[i]);
      t = bc[0];
    }

    //  Chi
    for (j = 0; j < 25; j += 5) {
      for (i = 0; i < 5; i++)
        bc[i] = st[j + i];
      for (i = 0; i < 5; i++)
        st[j + i] ^= (~bc[(i + 1) % 5]) & bc[(i + 2) % 5];
    }

    //  Iota
    st[0] ^= keccakf_rndc[r];
  }

#if __BYTE_ORDER__ != __ORDER_LITTLE_ENDIAN__
  // endianess conversion. this is redundant on little-endian targets
  for (i = 0; i < 25; i++) {
    v = (uint8_t *)&st[i];
    t = st[i];
    v[0] = t & 0xFF;
    v[1] = (t >> 8) & 0xFF;
    v[2] = (t >> 16) & 0xFF;
    v[3] = (t >> 24) & 0xFF;
    v[4] = (t >> 32) & 0xFF;
    v[5] = (t >> 40) & 0xFF;
    v[6] = (t >> 48) & 0xFF;
    v[7] = (t >> 56) & 0xFF;
  }
#endif
}

// Initialize the context for SHA3

int sha3_init(sha3_ctx_t *c, int mdlen)
{
  int i;

  for (i = 0; i < 25; i++)
    c->st.q[i] = 0;
  c->mdlen = mdlen;
  c->rsiz = 200 - 2 * mdlen;
  c->pt = 0;

  return 1;
}

// update state with more data

int sha3_update(sha3_ctx_t *c, const void *data, size_t len)
{
  size_t i;
  int j;

  j = c->pt;
  for (i = 0; i < len; i++) {
    c->st.b[j++] ^= ((const uint8_t *)data)[i];
    if (j >= c->rsiz) {
      sha3_keccakf(c->st.q);
      j = 0;
    }
  }
  c->pt = j;

  return 1;
}

// finalize and output a hash

int sha3_final(void *md, sha3_ctx_t *c)
{
  int i;

  c->st.b[c->pt] ^= 0x06;
  c->st.b[c->rsiz - 1] ^= 0x80;
  sha3_keccakf(c->st.q);

  for (i = 0; i < c->mdlen; i++) {
    ((uint8_t *)md)[i] = c->st.b[i];
  }

  return 1;
}

// compute a SHA-3 hash (md) of given byte length from "in"

void *sha3(const void *in, size_t inlen, void *md, int mdlen)
{
  sha3_ctx_t sha3;

  sha3_init(&sha3, mdlen);
  sha3_update(&sha3, in, inlen);
  sha3_final(md, &sha3);

  return md;
}