public static void Blake2Prime(Argon2Memory memory, LittleEndianActiveStream dataStream, int size = -1)
{
var hashStream = new LittleEndianActiveStream();
if (size < 0 || size > (memory.Length * 8))
{
size = memory.Length * 8;
}
hashStream.Expose(size);
hashStream.Expose(dataStream);
if (size <= 64)
{
var blake2 = new HMACBlake2B(8 * size);
blake2.Initialize();
memory.Blit(blake2.ComputeHash(hashStream), 0, 0, size);
}
else
{
var blake2 = new HMACBlake2B(512);
blake2.Initialize();
int offset = 0;
var chunk = blake2.ComputeHash(hashStream);
memory.Blit(chunk, offset, 0, 32); // copy half of the chunk
offset += 4;
size -= 32;
while (size > 64)
{
blake2.Initialize();
chunk = blake2.ComputeHash(chunk);
memory.Blit(chunk, offset, 0, 32); // half again
offset += 4;
size -= 32;
}
blake2 = new HMACBlake2B(size * 8);
blake2.Initialize();
memory.Blit(blake2.ComputeHash(chunk), offset, 0, size); // copy the rest
}
}
public void AllocationIsManagedAppropriately()
{
LittleEndianActiveStream stream = new LittleEndianActiveStream();
stream.Expose((uint)0x01010101);
stream.Expose((uint)0x30303030);
stream.Expose(new byte[] { 0x45, 0x61, 0xac, 0x4c, 0xf0, 0x00, 0x0b });
byte[] buffer = new byte[5];
Assert.Equal(5, stream.Read(buffer, 0, 5));
Assert.Equal(new byte[] { 0x1, 0x1, 0x1, 0x1, 0x30 }, buffer);
Assert.Equal(5, stream.Read(buffer, 0, 5));
Assert.Equal(new byte[] { 0x30, 0x30, 0x30, 0x45, 0x61 }, buffer);
Assert.Equal(5, stream.Read(buffer, 0, 5));
Assert.Equal(new byte[] { 0xac, 0x4c, 0xf0, 0x00, 0x0b }, buffer);
}
public void CrossesBoundariesAsExpected()
{
LittleEndianActiveStream stream = new LittleEndianActiveStream();
stream.Expose((uint)0x01010101);
stream.Expose((uint)0x30303030);
stream.Expose((uint)0x0a0a0a0a);
stream.Expose(new byte[] { 0x45, 0x61 });
byte[] buffer = new byte[5];
Assert.Equal(5, stream.Read(buffer, 0, 5));
Assert.Equal(new byte[] { 0x1, 0x1, 0x1, 0x1, 0x30 }, buffer);
Assert.Equal(5, stream.Read(buffer, 0, 5));
Assert.Equal(new byte[] { 0x30, 0x30, 0x30, 0x0a, 0x0a }, buffer);
Assert.Equal(4, stream.Read(buffer, 0, 5));
Assert.Equal(new byte[] { 0x0a, 0x0a, 0x45, 0x61 }, buffer.Take(4));
}
public void EndsWhereLastByteAvailable()
{
LittleEndianActiveStream stream = new LittleEndianActiveStream();
stream.Expose((ushort)0x4501);
byte[] buffer = new byte[4];
Assert.Equal(2, stream.Read(buffer, 0, 4));
Assert.Equal(0x01, buffer[0]);
Assert.Equal(0x45, buffer[1]);
}