/* CryptoNight Step 3: Bounce randomly 1,048,576 times (1<<20)
* through the mixing scratchpad, using 524,288 iterations of the
* following mixing function. Each execution performs two reads
* and writes from the mixing scratchpad.
*/
private static void MixScratchpadV0(CNState cnState,
ICryptoNight cnParams,
byte[] scratchpad)
{
MixScratchpadState mixingState = new MixScratchpadState(cnState);
for (int i = 0; i < cnParams.Iterations() / 2; i++)
{
for (int iteration = 1; iteration < 3; iteration++)
{
/* Get our 'memory' address we're using for this round */
int j = E2I(mixingState.a, cnParams.Memory());
/* Load c from the scratchpad */
CopyBlockFromScratchpad(scratchpad, mixingState.c, j);
/* Perform the mixing function */
if (iteration == 1)
{
MixScratchpadIterationOne(mixingState);
}
else
{
MixScratchpadIterationTwo(mixingState);
}
/* Write c back to the scratchpad */
CopyBlockToScratchpad(scratchpad, mixingState.c, j);
SwapBlocks(ref mixingState.a, ref mixingState.b);
}
}
}
private static void MixScratchpadIterationOne(MixScratchpadState
mixingState)
{
AES.AES.AESBSingleRound(mixingState.a, mixingState.c, 0);
XORBlocks(mixingState.b, mixingState.c);
SwapBlocks(ref mixingState.b, ref mixingState.c);
}
private static void MixScratchpadIterationTwo(MixScratchpadState
mixingState)
{
/* Multiply a and c together, and place the result in
* b, a and c are ulongs stored as byte arrays, d is a
* 128 bit value stored as a byte array */
Multiply128(mixingState.a, mixingState.c, mixingState.d);
SumHalfBlocks(mixingState.b, mixingState.d);
SwapBlocks(ref mixingState.b, ref mixingState.c);
XORBlocks(mixingState.b, mixingState.c);
}
