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/*
This code is written by kerukuro and released into public domain.
*/
#ifndef DIGESTPP_PROVIDERS_STREEBOG_HPP
#define DIGESTPP_PROVIDERS_STREEBOG_HPP
#include "../../detail/functions.hpp"
#include "../../detail/absorb_data.hpp"
#include "../../detail/validate_hash_size.hpp"
#include "constants/streebog_constants.hpp"
#include <array>
namespace digestpp
{
namespace detail
{
namespace streebog_functions
{
template<int I>
static inline uint64_t lps(unsigned char* ch)
{
return streebog_constants<void>::T[0][(ch[I])]
^ streebog_constants<void>::T[1][(ch[8 + I])]
^ streebog_constants<void>::T[2][(ch[16 + I])]
^ streebog_constants<void>::T[3][(ch[24 + I])]
^ streebog_constants<void>::T[4][(ch[32 + I])]
^ streebog_constants<void>::T[5][(ch[40 + I])]
^ streebog_constants<void>::T[6][(ch[48 + I])]
^ streebog_constants<void>::T[7][(ch[56 + I])];
}
static inline void lps_block(uint64_t* block)
{
unsigned char ch[64];
memcpy(ch, block, 64);
block[0] = lps<0>(ch);
block[1] = lps<1>(ch);
block[2] = lps<2>(ch);
block[3] = lps<3>(ch);
block[4] = lps<4>(ch);
block[5] = lps<5>(ch);
block[6] = lps<6>(ch);
block[7] = lps<7>(ch);
}
static inline void xor_blocks(uint64_t* block, const uint64_t* toxor)
{
block[0] ^= toxor[0];
block[1] ^= toxor[1];
block[2] ^= toxor[2];
block[3] ^= toxor[3];
block[4] ^= toxor[4];
block[5] ^= toxor[5];
block[6] ^= toxor[6];
block[7] ^= toxor[7];
}
static inline void e(uint64_t* K, const unsigned char* m)
{
uint64_t tmp[8];
memcpy(tmp, K, 64);
xor_blocks(K, reinterpret_cast<const uint64_t*>(m));
for (int i = 0; i < 12; i++)
{
lps_block(K);
xor_blocks(tmp, &streebog_constants<void>::RC[i][0]);
lps_block(tmp);
xor_blocks(K, tmp);
}
}
static inline void gN(uint64_t* h, const unsigned char* m, uint64_t N)
{
uint64_t hN[8];
memcpy(hN, h, 64);
hN[0] ^= N;
lps_block(hN);
e(hN, m);
xor_blocks(h, hN);
xor_blocks(h, reinterpret_cast<const uint64_t*>(m));
}
static inline void addm(const unsigned char* m, uint64_t* h)
{
const uint64_t* m64 = reinterpret_cast<const uint64_t*>(m);
bool carry = false, overflow = false;
for (int i = 0; i < 8; i++)
{
uint64_t t = h[i] + m64[i];
overflow = t < h[i] || t < m64[i];
h[i] = t + carry;
carry = overflow;
}
}
}
class streebog_provider
{
public:
static const bool is_xof = false;
streebog_provider(size_t hashsize)
: hs(hashsize)
{
validate_hash_size(hashsize, { 256, 512 });
}
~streebog_provider()
{
clear();
}
inline void init()
{
pos = 0;
total = 0;
memset(&h[0], hs == 512 ? 0 : 1, sizeof(uint64_t) * 8);
memset(&S[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, false); });
}
inline void final(unsigned char* hash)
{
m[pos++] = 0x01;
if (pos != 64)
memset(&m[pos], 0, 64 - pos);
transform(&m[0], 1, false);
total += (pos - 1) * 8;
memcpy(&m[0], &total, sizeof(total));
memset(&m[sizeof(total)], 0, 64 - sizeof(total));
transform(&m[0], 1, true);
transform(reinterpret_cast<const unsigned char*>(&S[0]), 1, true);
memcpy(hash, &h[8 - hash_size()/64], hash_size() / 8);
}
inline void clear()
{
zero_memory(h);
zero_memory(S);
zero_memory(m);
}
inline size_t hash_size() const { return hs; }
private:
inline void transform(const unsigned char* mp, size_t num_blks, bool final)
{
for (size_t blk = 0; blk < num_blks; blk++)
{
streebog_functions::gN(&h[0], mp + blk * 64, final ? 0ULL : total + blk * 512);
if (!final)
streebog_functions::addm(mp + blk * 64, &S[0]);
}
}
std::array<uint64_t, 8> h;
std::array<uint64_t, 8> S;
std::array<unsigned char, 64> m;
size_t hs;
size_t pos;
uint64_t total;
};
} // namespace detail
} // namespace digestpp
#endif
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