public void LoadXml(XmlElement value)
{
// Make sure we don't get passed null
if (value == null)
{
throw new ArgumentNullException("value");
}
// Signature
XmlElement signatureElement = value;
if (!signatureElement.LocalName.Equals("Signature"))
{
throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_InvalidElement"), "Signature");
}
// Id attribute -- optional
m_id = Utils.GetAttribute(signatureElement, "Id", SignedXml.XmlDsigNamespaceUrl);
XmlNamespaceManager nsm = new XmlNamespaceManager(value.OwnerDocument.NameTable);
nsm.AddNamespace("ds", SignedXml.XmlDsigNamespaceUrl);
// SignedInfo
XmlElement signedInfoElement = signatureElement.SelectSingleNode("ds:SignedInfo", nsm) as XmlElement;
if (signedInfoElement == null)
{
throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_InvalidElement"), "SignedInfo");
}
this.SignedInfo = new SignedInfo();
this.SignedInfo.LoadXml(signedInfoElement);
// SignatureValue
XmlElement signatureValueElement = signatureElement.SelectSingleNode("ds:SignatureValue", nsm) as XmlElement;
if (signatureValueElement == null)
{
throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_InvalidElement"), "SignedInfo/SignatureValue");
}
m_signatureValue = Convert.FromBase64String(Utils.DiscardWhiteSpaces(signatureValueElement.InnerText));
m_signatureValueId = Utils.GetAttribute(signatureValueElement, "Id", SignedXml.XmlDsigNamespaceUrl);
XmlNodeList keyInfoNodes = signatureElement.SelectNodes("ds:KeyInfo", nsm);
m_keyInfo = new KeyInfo();
if (keyInfoNodes != null)
{
foreach (XmlNode node in keyInfoNodes)
{
XmlElement keyInfoElement = node as XmlElement;
if (keyInfoElement != null)
{
m_keyInfo.LoadXml(keyInfoElement);
}
}
}
XmlNodeList objectNodes = signatureElement.SelectNodes("ds:Object", nsm);
m_embeddedObjects.Clear();
if (objectNodes != null)
{
foreach (XmlNode node in objectNodes)
{
XmlElement objectElement = node as XmlElement;
if (objectElement != null)
{
DataObject dataObj = new DataObject();
dataObj.LoadXml(objectElement);
m_embeddedObjects.Add(dataObj);
}
}
}
// Select all elements that have Id attributes
XmlNodeList nodeList = signatureElement.SelectNodes("//*[@Id]", nsm);
if (nodeList != null)
{
foreach (XmlNode node in nodeList)
{
m_referencedItems.Add(node);
}
}
}
protected override AsymmetricAlgorithm GetPublicKey()
{
if (KeyInfo == null)
{
throw ExceptionUtility.CryptographicException(Resources.XmlKeyInfoRequired);
}
if (X509Enumumerable != null)
{
var nextCertificatePublicKey = GetNextCertificatePublicKey();
if (nextCertificatePublicKey != null)
{
return(nextCertificatePublicKey);
}
}
if (KeyInfoEnumerable == null)
{
KeyInfoEnumerable = KeyInfo.GetEnumerator();
}
var keyInfoEnum = KeyInfoEnumerable;
while (keyInfoEnum.MoveNext())
{
var rsaKeyValue = keyInfoEnum.Current as RSAKeyValue;
if (rsaKeyValue != null)
{
return(rsaKeyValue.Key);
}
var dsaKeyValue = keyInfoEnum.Current as DSAKeyValue;
if (dsaKeyValue != null)
{
return(dsaKeyValue.Key);
}
var gostKeyValue = keyInfoEnum.Current as GostKeyValue;
if (gostKeyValue != null)
{
return(gostKeyValue.Key);
}
var keyInfoX509Data = keyInfoEnum.Current as KeyInfoX509Data;
if (keyInfoX509Data != null)
{
X509Collection = GostXmlUtils.BuildBagOfCertsVerification(keyInfoX509Data);
if (X509Collection.Count > 0)
{
X509Enumumerable = X509Collection.GetEnumerator();
var nextCertificatePublicKey = GetNextCertificatePublicKey();
if (nextCertificatePublicKey != null)
{
return(nextCertificatePublicKey);
}
}
}
}
return(null);
}
