internal byte[] Initialize(byte[] password)
{
// Initialize the lanes
HMACBlake2B blake2 = new HMACBlake2B(512);
LittleEndianActiveStream dataStream = new LittleEndianActiveStream();
dataStream.Expose(1);
dataStream.Expose(TagLine);
dataStream.Expose(MemorySize);
dataStream.Expose(Iterations);
dataStream.Expose((uint)0x13);
dataStream.Expose((uint)Type);
dataStream.Expose(password.Length);
dataStream.Expose(password);
dataStream.Expose(Salt?.Length ?? 0);
dataStream.Expose(Salt);
dataStream.Expose(Secret?.Length ?? 0);
dataStream.Expose(Secret);
dataStream.Expose(AssociatedData?.Length ?? 0);
dataStream.Expose(AssociatedData);
blake2.Initialize();
byte[] blockhash = blake2.ComputeHash(dataStream);
dataStream.ClearBuffer();
return(blockhash);
}
internal Argon2Lane[] InitializeLanes(byte[] password)
{
byte[] blockHash = Initialize(password);
Argon2Lane[] lanes = new Argon2Lane[1];
// Adjust memory size if needed so that each segment has an even size
int segmentLength = MemorySize / (lanes.Length * 4);
MemorySize = segmentLength * 4 * lanes.Length;
int blocksPerLane = MemorySize / lanes.Length;
if (blocksPerLane < 4)
{
throw new InvalidOperationException($"Memory should be enough to provide at least 4 blocks");
}
Action[] init = new Action[lanes.Length * 2];
for (int i = 0; i < lanes.Length; ++i)
{
lanes[i] = new Argon2Lane(blocksPerLane);
int taskIndex = i * 2;
int iClosure = i;
init[taskIndex] = () => {
LittleEndianActiveStream stream = new LittleEndianActiveStream();
stream.Expose(blockHash);
stream.Expose(0);
stream.Expose(iClosure);
ModifiedBlake2.Blake2Prime(lanes[iClosure][0], stream);
};
init[taskIndex + 1] = () => {
LittleEndianActiveStream stream = new LittleEndianActiveStream();
stream.Expose(blockHash);
stream.Expose(1);
stream.Expose(iClosure);
ModifiedBlake2.Blake2Prime(lanes[iClosure][1], stream);
};
}
foreach (Action t in init)
{
t();
}
Array.Clear(blockHash, 0, blockHash.Length);
return(lanes);
}
private byte[] Finalize(Argon2Lane[] lanes)
{
XorLanes(lanes);
LittleEndianActiveStream ds = new LittleEndianActiveStream();
ds.Expose(lanes[0][lanes[0].BlockCount - 1]);
ModifiedBlake2.Blake2Prime(lanes[0][1], ds, TagLine);
byte[] result = new byte[TagLine];
Argon2Memory memory = lanes[0][1];
memory.GetBuffer(result);
return(result);
}