public async Task<BlobFingerprint> GetFingerprintAsync(Stream stream, CancellationToken cancellationToken)
{
using (var sha3 = new Keccak())
using (var sha256 = SHA256.Create())
using (var md5 = MD5.Create())
{
var buffers = new[] { AllocateBuffer(), AllocateBuffer() };
var index = 0;
var totalLength = 0L;
var readTask = stream.ReadAsync(buffers[index], 0, buffers[index].Length, cancellationToken);
for (;;)
{
var length = await readTask.ConfigureAwait(false);
if (length < 1)
break;
var buffer = buffers[index];
if (++index >= buffers.Length)
index = 0;
readTask = stream.ReadAsync(buffers[index], 0, buffers[index].Length, cancellationToken);
totalLength += length;
sha3.TransformBlock(buffer, 0, length, null, 0);
sha256.TransformBlock(buffer, 0, length, null, 0);
md5.TransformBlock(buffer, 0, length, null, 0);
}
sha3.TransformFinalBlock(buffers[0], 0, 0);
sha256.TransformFinalBlock(buffers[0], 0, 0);
md5.TransformFinalBlock(buffers[0], 0, 0);
foreach (var buffer in buffers)
FreeBuffer(buffer);
var fingerprint = new BlobFingerprint(totalLength, sha3.Hash, sha256.Hash, md5.Hash);
return fingerprint;
}
}
public async Task <BlobFingerprint> GetFingerprintAsync(Stream stream, CancellationToken cancellationToken)
{
using (var sha3 = new Keccak())
using (var sha256 = SHA256.Create())
using (var md5 = MD5.Create())
{
var buffers = new[] { AllocateBuffer(), AllocateBuffer() };
var index = 0;
var totalLength = 0L;
var readTask = stream.ReadAsync(buffers[index], 0, buffers[index].Length, cancellationToken);
for (; ;)
{
var length = await readTask.ConfigureAwait(false);
if (length < 1)
{
break;
}
var buffer = buffers[index];
if (++index >= buffers.Length)
{
index = 0;
}
readTask = stream.ReadAsync(buffers[index], 0, buffers[index].Length, cancellationToken);
totalLength += length;
sha3.TransformBlock(buffer, 0, length, buffer, 0);
sha256.TransformBlock(buffer, 0, length, buffer, 0);
md5.TransformBlock(buffer, 0, length, buffer, 0);
}
sha3.TransformFinalBlock(buffers[0], 0, 0);
sha256.TransformFinalBlock(buffers[0], 0, 0);
md5.TransformFinalBlock(buffers[0], 0, 0);
foreach (var buffer in buffers)
{
FreeBuffer(buffer);
}
var fingerprint = new BlobFingerprint(totalLength, sha3.Hash, sha256.Hash, md5.Hash);
return(fingerprint);
}
}
