/*

* Whirlpool

* (C) 1999-2007 Jack Lloyd

*

* Botan is released under the Simplified BSD License (see license.txt)

*/

#include <botan/whrlpool.h>

#include <botan/loadstor.h>

namespace Botan {

std::unique_ptr<HashFunction> Whirlpool::copy_state() const

   {

   return std::unique_ptr<HashFunction>(new Whirlpool(*this));

   }

/*

* Whirlpool Compression Function

*/

void Whirlpool::compress_n(const uint8_t in[], size_t blocks)

   {

   static const uint64_t RC[10] = {

      0x1823C6E887B8014F, 0x36A6D2F5796F9152,

      0x60BC9B8EA30C7B35, 0x1DE0D7C22E4BFE57,

      0x157737E59FF04ADA, 0x58C9290AB1A06B85,

      0xBD5D10F4CB3E0567, 0xE427418BA77D95D8,

      0xFBEE7C66DD17479E, 0xCA2DBF07AD5A8333

   };

   for(size_t i = 0; i != blocks; ++i)

      {

      load_be(m_M.data(), in, m_M.size());

      uint64_t K0, K1, K2, K3, K4, K5, K6, K7;

      K0 = m_digest[0]; K1 = m_digest[1]; K2 = m_digest[2]; K3 = m_digest[3];

      K4 = m_digest[4]; K5 = m_digest[5]; K6 = m_digest[6]; K7 = m_digest[7];

      uint64_t B0, B1, B2, B3, B4, B5, B6, B7;

      B0 = K0 ^ m_M[0]; B1 = K1 ^ m_M[1]; B2 = K2 ^ m_M[2]; B3 = K3 ^ m_M[3];

      B4 = K4 ^ m_M[4]; B5 = K5 ^ m_M[5]; B6 = K6 ^ m_M[6]; B7 = K7 ^ m_M[7];

      for(size_t j = 0; j != 10; ++j)

         {

         uint64_t T0, T1, T2, T3, T4, T5, T6, T7;

         T0 = C0[get_byte(0, K0)] ^ C1[get_byte(1, K7)] ^

              C2[get_byte(2, K6)] ^ C3[get_byte(3, K5)] ^

              C4[get_byte(4, K4)] ^ C5[get_byte(5, K3)] ^

              C6[get_byte(6, K2)] ^ C7[get_byte(7, K1)] ^ RC[j];

         T1 = C0[get_byte(0, K1)] ^ C1[get_byte(1, K0)] ^

              C2[get_byte(2, K7)] ^ C3[get_byte(3, K6)] ^

              C4[get_byte(4, K5)] ^ C5[get_byte(5, K4)] ^

              C6[get_byte(6, K3)] ^ C7[get_byte(7, K2)];

         T2 = C0[get_byte(0, K2)] ^ C1[get_byte(1, K1)] ^

              C2[get_byte(2, K0)] ^ C3[get_byte(3, K7)] ^

              C4[get_byte(4, K6)] ^ C5[get_byte(5, K5)] ^

              C6[get_byte(6, K4)] ^ C7[get_byte(7, K3)];

         T3 = C0[get_byte(0, K3)] ^ C1[get_byte(1, K2)] ^

              C2[get_byte(2, K1)] ^ C3[get_byte(3, K0)] ^

              C4[get_byte(4, K7)] ^ C5[get_byte(5, K6)] ^

              C6[get_byte(6, K5)] ^ C7[get_byte(7, K4)];

         T4 = C0[get_byte(0, K4)] ^ C1[get_byte(1, K3)] ^

              C2[get_byte(2, K2)] ^ C3[get_byte(3, K1)] ^

              C4[get_byte(4, K0)] ^ C5[get_byte(5, K7)] ^

              C6[get_byte(6, K6)] ^ C7[get_byte(7, K5)];

         T5 = C0[get_byte(0, K5)] ^ C1[get_byte(1, K4)] ^

              C2[get_byte(2, K3)] ^ C3[get_byte(3, K2)] ^

              C4[get_byte(4, K1)] ^ C5[get_byte(5, K0)] ^

              C6[get_byte(6, K7)] ^ C7[get_byte(7, K6)];

         T6 = C0[get_byte(0, K6)] ^ C1[get_byte(1, K5)] ^

              C2[get_byte(2, K4)] ^ C3[get_byte(3, K3)] ^

              C4[get_byte(4, K2)] ^ C5[get_byte(5, K1)] ^

              C6[get_byte(6, K0)] ^ C7[get_byte(7, K7)];

         T7 = C0[get_byte(0, K7)] ^ C1[get_byte(1, K6)] ^

              C2[get_byte(2, K5)] ^ C3[get_byte(3, K4)] ^

              C4[get_byte(4, K3)] ^ C5[get_byte(5, K2)] ^

              C6[get_byte(6, K1)] ^ C7[get_byte(7, K0)];

         K0 = T0; K1 = T1; K2 = T2; K3 = T3;

         K4 = T4; K5 = T5; K6 = T6; K7 = T7;

         T0 = C0[get_byte(0, B0)] ^ C1[get_byte(1, B7)] ^

              C2[get_byte(2, B6)] ^ C3[get_byte(3, B5)] ^

              C4[get_byte(4, B4)] ^ C5[get_byte(5, B3)] ^

              C6[get_byte(6, B2)] ^ C7[get_byte(7, B1)] ^ K0;

         T1 = C0[get_byte(0, B1)] ^ C1[get_byte(1, B0)] ^

              C2[get_byte(2, B7)] ^ C3[get_byte(3, B6)] ^

              C4[get_byte(4, B5)] ^ C5[get_byte(5, B4)] ^

              C6[get_byte(6, B3)] ^ C7[get_byte(7, B2)] ^ K1;

         T2 = C0[get_byte(0, B2)] ^ C1[get_byte(1, B1)] ^

              C2[get_byte(2, B0)] ^ C3[get_byte(3, B7)] ^

              C4[get_byte(4, B6)] ^ C5[get_byte(5, B5)] ^

              C6[get_byte(6, B4)] ^ C7[get_byte(7, B3)] ^ K2;

         T3 = C0[get_byte(0, B3)] ^ C1[get_byte(1, B2)] ^

              C2[get_byte(2, B1)] ^ C3[get_byte(3, B0)] ^

              C4[get_byte(4, B7)] ^ C5[get_byte(5, B6)] ^

              C6[get_byte(6, B5)] ^ C7[get_byte(7, B4)] ^ K3;

         T4 = C0[get_byte(0, B4)] ^ C1[get_byte(1, B3)] ^

              C2[get_byte(2, B2)] ^ C3[get_byte(3, B1)] ^

              C4[get_byte(4, B0)] ^ C5[get_byte(5, B7)] ^

              C6[get_byte(6, B6)] ^ C7[get_byte(7, B5)] ^ K4;

         T5 = C0[get_byte(0, B5)] ^ C1[get_byte(1, B4)] ^

              C2[get_byte(2, B3)] ^ C3[get_byte(3, B2)] ^

              C4[get_byte(4, B1)] ^ C5[get_byte(5, B0)] ^

              C6[get_byte(6, B7)] ^ C7[get_byte(7, B6)] ^ K5;

         T6 = C0[get_byte(0, B6)] ^ C1[get_byte(1, B5)] ^

              C2[get_byte(2, B4)] ^ C3[get_byte(3, B3)] ^

              C4[get_byte(4, B2)] ^ C5[get_byte(5, B1)] ^

              C6[get_byte(6, B0)] ^ C7[get_byte(7, B7)] ^ K6;

         T7 = C0[get_byte(0, B7)] ^ C1[get_byte(1, B6)] ^

              C2[get_byte(2, B5)] ^ C3[get_byte(3, B4)] ^

              C4[get_byte(4, B3)] ^ C5[get_byte(5, B2)] ^

              C6[get_byte(6, B1)] ^ C7[get_byte(7, B0)] ^ K7;

         B0 = T0; B1 = T1; B2 = T2; B3 = T3;

         B4 = T4; B5 = T5; B6 = T6; B7 = T7;

         }

      m_digest[0] ^= B0 ^ m_M[0];

      m_digest[1] ^= B1 ^ m_M[1];

      m_digest[2] ^= B2 ^ m_M[2];

      m_digest[3] ^= B3 ^ m_M[3];

      m_digest[4] ^= B4 ^ m_M[4];

      m_digest[5] ^= B5 ^ m_M[5];

      m_digest[6] ^= B6 ^ m_M[6];

      m_digest[7] ^= B7 ^ m_M[7];

      in += hash_block_size();

      }

   }

/*

* Copy out the digest

*/

void Whirlpool::copy_out(uint8_t output[])

   {

   copy_out_vec_be(output, output_length(), m_digest);

   }

/*

* Clear memory of sensitive data

*/

void Whirlpool::clear()

   {

   MDx_HashFunction::clear();

   zeroise(m_M);

   zeroise(m_digest);

   }

}