private void CompressOneBlock(ReadOnlySpan <byte> block)
{
_blockCount += 1;
Span <uint> w = stackalloc uint[68];
for (var i = 0; i < 16; i++)
{
w[i] = ReadU32Be(block.Slice(i * 4, 4));
}
for (var j = 16; j < 68; j++)
{
w[j] = P1(w[j - 16] ^ w[j - 9] ^ RotL32(w[j - 3], 15)) ^ RotL32(w[j - 13], 7) ^ w[j - 6];
}
Span <uint> wp = stackalloc uint[64];
for (var j = 0; j < 64; j++)
{
wp[j] = w[j] ^ w[j + 4];
}
var(a, b, c, d, e, f, g, h) = _state;
for (var j = 0; j < 64; j++)
{
var ss1 = RotL32(RotL32(a, 12) + e + RotL32(T(j), (byte)(j % 32)), 7);
var ss2 = ss1 ^ RotL32(a, 12);
var tt1 = FF(j, a, b, c) + d + ss2 + wp[j];
var tt2 = GG(j, e, f, g) + h + ss1 + w[j];
d = c;
c = RotL32(b, 9);
b = a;
a = tt1;
h = g;
g = RotL32(f, 19);
f = e;
e = P0(tt2);
}
_state = (a, b, c, d, e, f, g, h) ^ _state;
}
public override void Initialize()
{
_state = (0x7380166fu, 0x4914b2b9u, 0x172442d7u, 0xda8a0600u, 0xa96f30bcu, 0x163138aau, 0xe38dee4du, 0xb0fb0e4e);
_blockCount = 0;
_msgBufCount = 0;
}