private string dereferenceURI(XmlNode reference)
{
XmlAttribute uriAttr = (XmlAttribute)reference.Attributes.GetNamedItem("URI");
string id = uriAttr.Value.Replace("#", "");
if (id == "Signature20140325080345213SignatureProperties")
id = id;
XmlNode digestMethNode = reference.SelectSingleNode("ds:DigestMethod", xNS);
XmlAttribute digestMethNode_alg = (XmlAttribute)digestMethNode.Attributes.GetNamedItem("Algorithm");
string alg = digestMethNode_alg.Value;
XmlNode digestValNode = reference.SelectSingleNode("ds:DigestValue", xNS);
string digestValue = digestValNode.InnerText;
//ak ide o manifest -> kanonikalizacia a overenie odtlacku
if (id.StartsWith("ManifestObject"))
{
XmlNode manifestNode = xSignature.SelectSingleNode("//ds:Manifest[@Id='" + id + "']", xNS);
string s = manifestNode.OuterXml;
// The XmlDsigC14NTranswill strip the UTF8 BOM
using (MemoryStream msIn = new MemoryStream(System.Text.Encoding.UTF8.GetBytes(s)))
{
XmlDsigC14NTransform t = new XmlDsigC14NTransform(true);
t.LoadInput(msIn);
HashAlgorithm hash = null;
switch (alg)
{
case "http://www.w3.org/2000/09/xmldsig#sha1":
hash = new System.Security.Cryptography.SHA1Managed();
break;
case "http://www.w3.org/2001/04/xmldsig-more#sha224":
//hash = new System.Security.Cryptography.SH();
break;
case "http://www.w3.org/2001/04/xmlenc#sha256":
hash = new System.Security.Cryptography.SHA256Managed();
break;
case "http://www.w3.org/2001/04/xmldsig-more#sha384":
hash = new System.Security.Cryptography.SHA384Managed();
break;
case "http://www.w3.org/2001/04/xmlenc#sha512":
hash = new System.Security.Cryptography.SHA512Managed();
break;
}
if (hash == null)
return "hash algorithm ERROR (" + alg + ")";
byte[] digest = t.GetDigestedOutput(hash);
//string result = BitConverter.ToString(digest).Replace("-", String.Empty);
string result = Convert.ToBase64String(digest);
if (result.Equals(digestValue))
return string.Empty;
else
{
return "digest value ERROR";
}
}
}
return string.Empty;
//throw new NotImplementedException();
}
