public void Process(DicomDataset dicomDataset, DicomItem item, ProcessContext context = null)
{
EnsureArg.IsNotNull(dicomDataset, nameof(dicomDataset));
EnsureArg.IsNotNull(item, nameof(item));
if (item is DicomStringElement)
{
var hashedValues = ((DicomStringElement)item).Get <string[]>().Select(GetCryptoHashString);
dicomDataset.AddOrUpdate(item.ValueRepresentation, item.Tag, hashedValues.ToArray());
}
else if (item is DicomOtherByte)
{
var valueBytes = ((DicomOtherByte)item).Get <byte[]>();
var hashedBytes = _cryptoHashFunction.Hash(valueBytes);
dicomDataset.AddOrUpdate(item.ValueRepresentation, item.Tag, hashedBytes);
}
else if (item is DicomFragmentSequence)
{
var element = item.ValueRepresentation == DicomVR.OW
? (DicomFragmentSequence) new DicomOtherWordFragment(item.Tag)
: new DicomOtherByteFragment(item.Tag);
foreach (var fragment in (DicomFragmentSequence)item)
{
element.Fragments.Add(new MemoryByteBuffer(_cryptoHashFunction.Hash(fragment.Data)));
}
dicomDataset.AddOrUpdate(element);
}
else
{
throw new AnonymizerOperationException(DicomAnonymizationErrorCode.UnsupportedAnonymizationMethod, $"CryptoHash is not supported for {item.ValueRepresentation}.");
}
_logger.LogDebug($"The value of DICOM item '{item}' is cryptoHashed.");
}
public void GivenAString_WhenComputeHmac_CorrectHashShouldBeReturned(string input, string expectedHash)
{
var hashData = _function.Hash(input);
Assert.Equal(expectedHash, hashData == null ? null : string.Concat(hashData.Select(b => b.ToString("x2"))));
}
public void GivenAStream_WhenComputeHmac512_CorrectHashShouldBeReturned(Stream input, string expectedHash)
{
var hashData = CryptoHashFunction.Hash(input, new HMACSHA512(Encoding.UTF8.GetBytes(TestHashKey)));
Assert.Equal(expectedHash, hashData == null ? null : string.Concat(hashData.Select(b => b.ToString("x2"))));
}
