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/*
This code is written by kerukuro and released into public domain.
*/
#ifndef DIGESTPP_PROVIDERS_WHIRLPOOL_HPP
#define DIGESTPP_PROVIDERS_WHIRLPOOL_HPP
#include "../../detail/functions.hpp"
#include "../../detail/absorb_data.hpp"
#include "constants/whirlpool_constants.hpp"
#include <array>
namespace digestpp
{
namespace detail
{
namespace whirlpool_functions
{
template<int a>
static inline uint64_t G(const uint64_t* ll)
{
return whirlpool_constants<void>::T[0][static_cast<unsigned char>(ll[a % 8])]
^ whirlpool_constants<void>::T[1][static_cast<unsigned char>(ll[(a - 1) % 8] >> 8)]
^ whirlpool_constants<void>::T[2][static_cast<unsigned char>(ll[(a - 2) % 8] >> 16)]
^ whirlpool_constants<void>::T[3][static_cast<unsigned char>(ll[(a - 3) % 8] >> 24)]
^ whirlpool_constants<void>::T[4][static_cast<unsigned char>(ll[(a - 4) % 8] >> 32)]
^ whirlpool_constants<void>::T[5][static_cast<unsigned char>(ll[(a - 5) % 8] >> 40)]
^ whirlpool_constants<void>::T[6][static_cast<unsigned char>(ll[(a - 6) % 8] >> 48)]
^ whirlpool_constants<void>::T[7][static_cast<unsigned char>(ll[(a - 7) % 8] >> 56)];
}
}
class whirlpool_provider
{
public:
static const bool is_xof = false;
whirlpool_provider()
{
}
~whirlpool_provider()
{
clear();
}
inline void init()
{
pos = 0;
total = 0;
memset(&h[0], 0, sizeof(uint64_t)*8);
}
inline void update(const unsigned char* data, size_t len)
{
detail::absorb_bytes(data, len, 64, 64, m.data(), pos, total,
[this](const unsigned char* data, size_t len) { transform(data, len); });
}
inline void final(unsigned char* hash)
{
total += pos * 8;
uint64_t mlen = byteswap(total);
m[pos++] = 0x80;
if (pos > 32)
{
if (pos != 64)
memset(&m[pos], 0, 64 - pos);
transform(m.data(), 1);
pos = 0;
}
memset(&m[pos], 0, 56 - pos);
memcpy(&m[64 - 8], &mlen, 64 / 8);
transform(m.data(), 1);
memcpy(hash, h.data(), hash_size() / 8);
}
inline void clear()
{
zero_memory(h);
zero_memory(m);
}
inline size_t hash_size() const { return 512; }
private:
inline void transform(const unsigned char* mp, size_t num_blks)
{
for (uint64_t b = 0; b < num_blks; b++)
{
uint64_t K[8], state[8];
memcpy(K, h.data(), sizeof(K));
for (int i = 0; i < 8; ++i)
state[i] = h[i] ^ (reinterpret_cast<const uint64_t*>(mp)[i]);
for (int r = 0; r < 10; ++r)
{
uint64_t L[8];
L[0] = whirlpool_functions::G<0 + 8>(K) ^ whirlpool_constants<void>::RC[r];
L[1] = whirlpool_functions::G<1 + 8>(K);
L[2] = whirlpool_functions::G<2 + 8>(K);
L[3] = whirlpool_functions::G<3 + 8>(K);
L[4] = whirlpool_functions::G<4 + 8>(K);
L[5] = whirlpool_functions::G<5 + 8>(K);
L[6] = whirlpool_functions::G<6 + 8>(K);
L[7] = whirlpool_functions::G<7 + 8>(K);
memcpy(K, L, sizeof(L));
L[0] ^= whirlpool_functions::G<0 + 8>(state);
L[1] ^= whirlpool_functions::G<1 + 8>(state);
L[2] ^= whirlpool_functions::G<2 + 8>(state);
L[3] ^= whirlpool_functions::G<3 + 8>(state);
L[4] ^= whirlpool_functions::G<4 + 8>(state);
L[5] ^= whirlpool_functions::G<5 + 8>(state);
L[6] ^= whirlpool_functions::G<6 + 8>(state);
L[7] ^= whirlpool_functions::G<7 + 8>(state);
memcpy(state, L, sizeof(L));
}
for (int i = 0; i < 8; ++i)
h[i] ^= state[i] ^ reinterpret_cast<const uint64_t*>(mp)[i];
mp += 64;
}
}
std::array<uint64_t, 8> h;
std::array<unsigned char, 64> m;
size_t pos;
uint64_t total;
};
} // namespace detail
} // namespace digestpp
#endif
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