internal async Task <Argon2Lane[]> InitializeLanes(byte[] password)
{
var blockHash = Initialize(password);
var lanes = new Argon2Lane[DegreeOfParallelism];
// adjust memory size if needed so that each segment has
// an even size
var segmentLength = MemorySize / (lanes.Length * 4);
MemorySize = segmentLength * 4 * lanes.Length;
var blocksPerLane = MemorySize / lanes.Length;
if (blocksPerLane < 4)
{
throw new InvalidOperationException($"Memory should be enough to provide at least 4 blocks per {nameof(DegreeOfParallelism)}");
}
Task[] init = new Task[lanes.Length * 2];
for (var i = 0; i < lanes.Length; ++i)
{
lanes[i] = new Argon2Lane(blocksPerLane);
int taskIndex = i * 2;
int iClosure = i;
init[taskIndex] = Task.Run(() =>
{
var stream = new LittleEndianActiveStream();
stream.Expose(blockHash);
stream.Expose(0);
stream.Expose(iClosure);
ModifiedBlake2.Blake2Prime(lanes[iClosure][0], stream);
});
init[taskIndex + 1] = Task.Run(() =>
{
var stream = new LittleEndianActiveStream();
stream.Expose(blockHash);
stream.Expose(1);
stream.Expose(iClosure);
ModifiedBlake2.Blake2Prime(lanes[iClosure][1], stream);
});
}
await Task.WhenAll(init).ConfigureAwait(false);
Array.Clear(blockHash, 0, blockHash.Length);
return(lanes);
}
private byte[] Finalize(Argon2Lane[] lanes)
{
XorLanes(lanes);
var ds = new LittleEndianActiveStream();
ds.Expose(lanes[0][lanes[0].BlockCount - 1]);
ModifiedBlake2.Blake2Prime(lanes[0][1], ds, _tagLine);
var result = new byte[_tagLine];
var tmp = MemoryMarshal.Cast <ulong, byte>(lanes[0][1].Span).Slice(0, result.Length);
tmp.CopyTo(result);
return(result);
}
private byte[] Finalize(Argon2Lane[] lanes)
{
XorLanes(lanes);
var ds = new LittleEndianActiveStream();
ds.Expose(lanes[0][lanes[0].BlockCount - 1]);
ModifiedBlake2.Blake2Prime(lanes[0][1], ds, _tagLine);
var result = new byte[_tagLine];
var stream = new Argon2Memory.Stream(lanes[0][1]);
stream.Read(result, 0, _tagLine);
return(result);
}
internal unsafe static void Compress(Argon2Memory dest, Argon2Memory refb, Argon2Memory prev)
{
var tmpblock = stackalloc ulong[dest.Length];
for (var n = 0; n < 128; ++n)
{
tmpblock[n] = refb[n] ^ prev[n];
dest[n] ^= tmpblock[n];
}
for (var i = 0; i < 8; ++i)
{
ModifiedBlake2.DoRoundColumns(tmpblock, i);
}
for (var i = 0; i < 8; ++i)
{
ModifiedBlake2.DoRoundRows(tmpblock, i);
}
for (var n = 0; n < 128; ++n)
{
dest[n] ^= tmpblock[n];
}
}