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/*
* Streebog
* (C) 2017 Ribose Inc.
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/streebog.h>
#include <botan/exceptn.h>
namespace Botan {
extern const uint64_t STREEBOG_Ax[8][256];
extern const uint64_t STREEBOG_C[12][8];
std::unique_ptr<HashFunction> Streebog::copy_state() const
{
return std::unique_ptr<HashFunction>(new Streebog(*this));
}
namespace {
static inline void addm(const uint8_t* m, uint64_t* h)
{
uint64_t carry = false;
for(int i = 0; i < 8; i++)
{
const uint64_t m64 = load_le<uint64_t>(m, i);
const uint64_t hi = load_le<uint64_t>(reinterpret_cast<uint8_t*>(h), i);
const uint64_t t = hi + m64;
const uint64_t overflow = (t < hi) | (t < m64);
store_le(t + carry, reinterpret_cast<uint8_t*>(&h[i]));
carry = overflow;
}
}
inline void lps(uint64_t* block)
{
uint8_t r[64];
std::memcpy(r, block, 64);
for(int i = 0; i < 8; ++i)
{
block[i] = load_le<uint64_t>(reinterpret_cast<const uint8_t*>(&STREEBOG_Ax[0][r[i]]), 0) ^
load_le<uint64_t>(reinterpret_cast<const uint8_t*>(&STREEBOG_Ax[1][r[i + 8]]), 0) ^
load_le<uint64_t>(reinterpret_cast<const uint8_t*>(&STREEBOG_Ax[2][r[i + 16]]), 0) ^
load_le<uint64_t>(reinterpret_cast<const uint8_t*>(&STREEBOG_Ax[3][r[i + 24]]), 0) ^
load_le<uint64_t>(reinterpret_cast<const uint8_t*>(&STREEBOG_Ax[4][r[i + 32]]), 0) ^
load_le<uint64_t>(reinterpret_cast<const uint8_t*>(&STREEBOG_Ax[5][r[i + 40]]), 0) ^
load_le<uint64_t>(reinterpret_cast<const uint8_t*>(&STREEBOG_Ax[6][r[i + 48]]), 0) ^
load_le<uint64_t>(reinterpret_cast<const uint8_t*>(&STREEBOG_Ax[7][r[i + 56]]), 0);
}
}
inline void e(uint64_t* K, const uint8_t* m)
{
uint64_t tmp[8];
uint64_t C[8];
std::memcpy(tmp, K, 64);
xor_buf(K, reinterpret_cast<const uint64_t*>(m), 8);
for(int i = 0; i < 12; ++i)
{
lps(K);
load_le(C, reinterpret_cast<const uint8_t*>(&STREEBOG_C[i][0]), 8);
xor_buf(tmp, C, 8);
lps(tmp);
xor_buf(K, tmp, 8);
}
}
inline void g(uint64_t* h, const uint8_t* m, uint64_t N)
{
uint64_t hN[8];
// force N to little-endian
store_le(N, reinterpret_cast<uint8_t*>(&N));
std::memcpy(hN, h, 64);
hN[0] ^= N;
lps(hN);
e(hN, m);
xor_buf(h, hN, 8);
xor_buf(h, reinterpret_cast<const uint64_t*>(m), 8);
}
} //namespace
Streebog::Streebog(size_t output_bits) :
m_output_bits(output_bits),
m_count(0),
m_position(0),
m_buffer(64),
m_h(8),
m_S(8)
{
if(output_bits != 256 && output_bits != 512)
throw Invalid_Argument("Streebog: Invalid output length " +
std::to_string(output_bits));
clear();
}
std::string Streebog::name() const
{
return "Streebog-" + std::to_string(m_output_bits);
}
/*
* Clear memory of sensitive data
*/
void Streebog::clear()
{
m_count = 0;
m_position = 0;
zeroise(m_buffer);
zeroise(m_S);
const uint64_t fill = (m_output_bits == 512) ? 0 : 0x0101010101010101;
std::fill(m_h.begin(), m_h.end(), fill);
}
/*
* Update the hash
*/
void Streebog::add_data(const uint8_t input[], size_t length)
{
while(m_position + length >= 64)
{
buffer_insert(m_buffer, m_position, input, 64 - m_position);
compress(m_buffer.data());
m_count += 512;
input += (64 - m_position);
length -= (64 - m_position);
m_position = 0;
}
buffer_insert(m_buffer, m_position, input, length);
m_position += length;
}
/*
* Finalize a hash
*/
void Streebog::final_result(uint8_t output[])
{
m_buffer[m_position++] = 0x01;
if(m_position != m_buffer.size())
clear_mem(&m_buffer[m_position], m_buffer.size() - m_position);
compress(m_buffer.data());
m_count += (m_position - 1) * 8;
zeroise(m_buffer);
store_le(m_count, m_buffer.data());
compress(m_buffer.data(), true);
compress(reinterpret_cast<const uint8_t*>(m_S.data()), true);
std::memcpy(output, &m_h[8 - output_length() / 8], output_length());
clear();
}
void Streebog::compress(const uint8_t input[], bool last_block)
{
g(m_h.data(), input, last_block ? 0ULL : m_count);
if(!last_block)
{ addm(input, m_S.data()); }
}
}
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