/* CryptoNight Step 5: Apply Keccak to the state again, and then
* use the resulting data to select which of four finalizer
* hash functions to apply to the data (Blake, Groestl, JH,
* or Skein). Use this hash to squeeze the state array down
* to the final 32 byte hash output.
*/
public static byte[] HashFinalState(CNState cnState)
{
/* Get the state buffer as an array of ulongs rather than bytes */
ulong[] hashState = cnState.GetHashState();
Keccak.Keccakf(hashState, 24);
/* Set the state buffer from the coerced hash state */
cnState.SetHashState(hashState);
/* Get the actual state buffer finally */
byte[] state = cnState.GetState();
/* Choose the final hashing function to use based on the value of
* state[0] */
switch (state[0] % 4)
{
case 0:
{
return(new Blake().Hash(state));
}
case 1:
{
return(new Groestl().Hash(state));
}
case 2:
{
return(new JH().Hash(state));
}
default:
{
return(new Skein().Hash(state));
}
}
}
/* 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 unsafe void MixScratchpadV2(
CNState cnState,
ICryptoNight cnParams,
byte[] scratchpad)
{
byte[] aArray = new byte[AES.BLOCK_SIZE];
byte[] bArray = new byte[AES.BLOCK_SIZE * 2];
byte[] cArray = new byte[AES.BLOCK_SIZE];
fixed(byte *scratchpadPtr = scratchpad,
aByte = aArray,
bByte = bArray,
cByte = cArray,
k = cnState.GetK(),
hashState = cnState.GetState())
{
ulong lo;
ulong hi;
ulong *loPtr = &lo;
ulong *p;
ulong *a = (ulong *)aByte;
ulong *b = (ulong *)bByte;
ulong *c = (ulong *)cByte;
CryptoNight.InitMixingState((ulong *)a, (ulong *)b, (ulong *)k);
int j;
ulong *w = (ulong *)hashState;
b[2] = w[8] ^ w[10];
b[3] = w[9] ^ w[11];
ulong divisionResult = w[12];
ulong sqrtResult = w[13];
Vector128 <byte> _a;
Vector128 <byte> _b = Sse2.LoadVector128(bByte);
Vector128 <byte> _b1 = Sse2.LoadVector128(bByte + 16);
Vector128 <byte> _c;
for (int i = 0; i < cnParams.AesRounds; i++)
{
/* Get our 'memory' address we're using for this round */
j = CryptoNight.StateIndex(*a, cnParams.ScratchModulus);
/* Load C from the memory address in the scratchpad */
_c = Sse2.LoadVector128(scratchpadPtr + j);
/* Reload A from the buffer */
_a = Sse2.LoadVector128(aByte);
/* Use AES to mix scratchpad into c */
_c = Aes.Encrypt(_c, _a);
VariantTwoShuffleAdd(
scratchpadPtr,
j,
_b1,
_b,
_a
);
/* Store C back in it's original spot */
Sse2.Store(cByte, _c);
/* XOR b and C, and store back at the 'memory' address
* in the scratchpad */
Sse2.Store(scratchpadPtr + j, Sse2.Xor(_b, _c));
/* Get the new 'memory' address we're using for this round */
j = CryptoNight.StateIndex(*c, cnParams.ScratchModulus);
/* Grab a pointer to the spot of memory we're interested */
p = (ulong *)(scratchpadPtr + j);
/* Load b from the memory address in the scratchpad */
b[0] = p[0];
b[1] = p[1];
VariantTwoIntegerMath(b, c, ref divisionResult, ref sqrtResult);
/* 64 bit multiply the low parts of C and B */
hi = Bmi2.X64.MultiplyNoFlags(c[0], b[0], loPtr);
*(ulong *)(scratchpadPtr + (j ^ 0x10)) ^= hi;
*((ulong *)(scratchpadPtr + (j ^ 0x10)) + 1) ^= lo;
hi ^= *(ulong *)(scratchpadPtr + (j ^ 0x20));
lo ^= *((ulong *)(scratchpadPtr + (j ^ 0x20)) + 1);
VariantTwoShuffleAdd(
scratchpadPtr,
j,
_b1,
_b,
_a
);
/* Sum the result halves of the multiplication with each half of A */
a[0] += hi;
a[1] += lo;
/* Write the modified A back to the scratchpad */
p[0] = a[0];
p[1] = a[1];
/* Xor the two 64 bit halves of A and B */
a[0] ^= b[0];
a[1] ^= b[1];
_b1 = _b;
/* Store C in B */
_b = _c;
}
}
}
private static unsafe void MixScratchpadV2(
CNState cnState,
ICryptoNight cnParams,
byte[] scratchpad)
{
byte[] aArray = new byte[AES.BLOCK_SIZE];
byte[] bArray = new byte[AES.BLOCK_SIZE * 2];
byte[] cArray = new byte[AES.BLOCK_SIZE];
byte[] c1Array = new byte[AES.BLOCK_SIZE];
byte[] dArray = new byte[AES.BLOCK_SIZE];
fixed(byte *scratchpadPtr = scratchpad,
a = aArray,
b = bArray,
c = cArray,
c1 = c1Array,
d = dArray,
k = cnState.GetK(),
hashState = cnState.GetState())
{
ulong divisionResult;
ulong sqrtResult;
CryptoNight.InitMixingState((ulong *)a, (ulong *)b, (ulong *)k);
/* Init */
{
ulong *_b = (ulong *)b;
ulong *w = (ulong *)hashState;
_b[2] = w[8] ^ w[10];
_b[3] = w[9] ^ w[11];
divisionResult = w[12];
sqrtResult = w[13];
}
for (int i = 0; i < cnParams.AesRounds; i++)
{
/* ITERATION ONE */
/* Get the memory address */
int j = CryptoNight.StateIndex(*(ulong *)a, cnParams.ScratchModulus);
/* Get a pointer to the memory address in the scratchpad */
ulong *p = (ulong *)(scratchpadPtr + j);
/* Perform AES round from/to scratchpad, with A as the
* expanded key */
AES.AESBSingleRound((uint *)p, (uint *)a);
/* Copy a block from p to c1 */
CopyBlock(c1, p);
VariantTwoShuffleAdd(scratchpadPtr, j, (ulong *)b, (ulong *)a);
XORBlocks(p, (ulong *)b);
/* ITERATION TWO */
/* Get new memory address */
j = CryptoNight.StateIndex(*(ulong *)c1, cnParams.ScratchModulus);
/* Update pointer to scratchpad */
p = (ulong *)(scratchpadPtr + j);
/* Copy a block from p to c */
CopyBlock(c, p);
VariantTwoIntegerMath(
(ulong *)c,
(ulong *)c1,
ref divisionResult,
ref sqrtResult
);
Multiply64((ulong *)c1, (ulong *)c, (ulong *)d);
/* Variant 2 */
XORBlocks((ulong *)(scratchpadPtr + (j ^ 0x10)), (ulong *)d);
XORBlocks((ulong *)d, (ulong *)(scratchpadPtr + (j ^ 0x20)));
VariantTwoShuffleAdd(scratchpadPtr, j, (ulong *)b, (ulong *)a);
/* Sum half blocks */
((ulong *)a)[0] += ((ulong *)d)[0];
((ulong *)a)[1] += ((ulong *)d)[1];
SwapBlocks((ulong *)a, (ulong *)c);
XORBlocks((ulong *)a, (ulong *)c);
/* Copy a block from c to p */
CopyBlock(p, c);
/* Copy first half of b to second half */
CopyBlock(b + AES.BLOCK_SIZE, b);
/* Copy a block from c1 to b */
CopyBlock(b, c1);
}
}
}
