public CryptoHashProcessor(JObject settingObject)
{
EnsureArg.IsNotNull(settingObject, nameof(settingObject));
var settingFactory = new AnonymizerSettingsFactory();
var cryptoHashSetting = settingFactory.CreateAnonymizerSetting <CryptoHashSetting>(settingObject);
_cryptoHashFunction = new CryptoHashFunction(cryptoHashSetting);
}
public void Process(DicomDataset dicomDataset, DicomItem item, Dictionary <string, object> settings = null)
{
var encoding = Encoding.UTF8;
if (item is DicomMultiStringElement)
{
var encryptedValues = ((DicomMultiStringElement)item).Get <string[]>().Select(GetCryptoHashString);
dicomDataset.AddOrUpdate(item.Tag, encryptedValues.ToArray());
}
else if (item is DicomStringElement)
{
var value = ((DicomMultiStringElement)item).Get <string>();
var encryptedValue = GetCryptoHashString(value);
dicomDataset.AddOrUpdate(item.Tag, encryptedValue);
}
else
{
var valueBytes = ((DicomElement)item).Get <byte[]>();
var encryptesBytes = CryptoHashFunction.ComputeHmacSHA256Hash(valueBytes, _cryptoHashKey);
dicomDataset.AddOrUpdate(item.Tag, encryptesBytes);
}
}
public string GetCryptoHashString(string input)
{
var resultBytes = CryptoHashFunction.ComputeHmacSHA256Hash(Encoding.UTF8.GetBytes(input), _cryptoHashKey);
return(resultBytes == null ? null : string.Concat(resultBytes.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"))));
}
