private static unsafe void BlockMix
(uint *B, // 16*2*r
int Boffset,
uint *Bp, // 16*2*r
uint Bpoffset,
uint *x, // 16
uint *y, // 16*2*r -- unnecessary but it allows us to alias B and Bp
uint *scratch1, // 16
/*uint* scratch2, // 16 */
int r)
{
int k = Boffset, m = 0, n = 16 * r;
CopyExtensions.CopyMemory((byte *)(B + ((2 * r - 1) * 16)), (byte *)x, 16 * sizeof(uint));
for (int i = 0; i < r; i++)
{
for (int j = 0; j < 16; j++)
{
scratch1[j] = x[j] ^ B[j + k];
}
XSalsa20Engine.HSalsaUnsafe(8, scratch1, x);
CopyExtensions.CopyMemory((byte *)x, (byte *)(y + m), 16 * sizeof(uint));
k += 16;
for (int j = 0; j < 16; j++)
{
scratch1[j] = x[j] ^ B[j + k];
}
XSalsa20Engine.HSalsaUnsafe(8, scratch1, x);
CopyExtensions.CopyMemory((byte *)x, (byte *)(y + m + n), 16 * sizeof(uint));
k += 16;
m += 16;
}
CopyExtensions.CopyMemory((byte *)y, (byte *)(Bp + Bpoffset), n * 2 * sizeof(uint));
}
public static T Copy <T>(this T sourceItem) => CopyExtensions.Copy(sourceItem);
