private byte[] CalculateHash(Reference reference, UriResolverDelegate resolver)
{
if (reference.Uri == null || reference.Uri.Length == 0 || reference.Uri[0] == '#')
{
return((byte[])_calculateHashValue.Invoke(reference, new object[] { _document, null }));
}
try
{
Stream stream;
if (resolver != null)
{
stream = resolver(Uri.UnescapeDataString(reference.Uri));
}
else
{
using (WebClient wc = new WebClient())
stream = wc.OpenRead(reference.Uri);
}
return(XadesUtils.CalculateHash(stream, reference.TransformChain, reference.DigestMethod));
}
catch (Exception)
{
return(new byte[0]);
}
}
/// <summary>
/// Check signature policy hash
/// </summary>
/// <param name="stream"></param>
/// <returns></returns>`
public bool CheckPolicyHash(Stream stream)
{
byte[] digest = XadesUtils.CalculateHash(stream, PolicyTransformChain, PolicyDigestMethod);
return(digest.SequenceEqual(PolicyDigest));
}
/// <summary>
/// Update hash value from stream
/// </summary>
/// <param name="stream"></param>
public void CalculatePolicyHash(Stream stream)
{
PolicyDigest = XadesUtils.CalculateHash(stream, PolicyTransformChain, PolicyDigestMethod);
}