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hash/blake2: avoid copying hash state from compression function

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This commit is contained in:
Danny Robson 2019-02-04 20:34:57 +11:00
parent b6477214ad
commit 485cc52a7b
1 changed files with 7 additions and 9 deletions
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14
hash/blake2.cpp
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@ -81,8 +81,8 @@ G (word_t v[16], int a, int b, int c, int d, word_t x, word_t y)
//-----------------------------------------------------------------------------
// compression function
static std::array<word_t,8>
F (std::array<word_t,8> h, const word_t m[16], u64 t, bool f)
static void
F (std::array<word_t,8> &h, const word_t m[16], u64 t, bool const f)
{
word_t v[16] {
h[0], h[1], h[2], h[3], h[4], h[5], h[6], h[7],
@ -119,8 +119,6 @@ F (std::array<word_t,8> h, const word_t m[16], u64 t, bool f)
for (int i = 0; i < 8; ++i)
h[i] ^= v[i] ^ v[i + 8];
return h;
}
@ -153,12 +151,12 @@ blake2::operator() (cruft::view<const u08 *> data) const noexcept
h[0] ^= 0x01010000 ^ (m_keylen << 8) ^ sizeof (digest_t);
if (m_keylen)
h = F (h, reinterpret_cast<const word_t*> (m_salt.data ()), ::traits::block_bytes, data.empty ());
F (h, reinterpret_cast<const word_t*> (m_salt.data ()), ::traits::block_bytes, data.empty ());
// special case for the empty key and empty data
if (!m_keylen && data.empty ()) {
std::array<word_t,16> zeroes {};
h = F (h, zeroes.data (), 0, true);
F (h, zeroes.data (), 0, true);
}
u64 counter = m_keylen ? ::traits::block_bytes : 0;
@ -166,7 +164,7 @@ blake2::operator() (cruft::view<const u08 *> data) const noexcept
auto cursor = data.begin ();
while (cursor + ::traits::block_bytes < data.end ()) {
counter += ::traits::block_bytes;
h = F (h, reinterpret_cast<const word_t*> (cursor), counter, false);
F (h, reinterpret_cast<const word_t*> (cursor), counter, false);
cursor += ::traits::block_bytes;
}
@ -174,7 +172,7 @@ blake2::operator() (cruft::view<const u08 *> data) const noexcept
std::array<u64,16> tail {};
memcpy (tail.data(), data.data (), data.cend () - cursor);
counter += data.end () - cursor;
h = F (h, tail.data (), counter, true);
F (h, tail.data (), counter, true);
}
digest_t d;