public void LoadXml(XmlElement value)
{
if (value == null)
{
throw new ArgumentNullException("value");
}
// SignedInfo
XmlElement signedInfoElement = value;
if (!signedInfoElement.LocalName.Equals("SignedInfo"))
{
throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_InvalidElement"), "SignedInfo");
}
XmlNamespaceManager nsm = new XmlNamespaceManager(value.OwnerDocument.NameTable);
nsm.AddNamespace("ds", SignedXml.XmlDsigNamespaceUrl);
int expectedChildNodes = 0;
// Id attribute -- optional
m_id = Utils.GetAttribute(signedInfoElement, "Id", SignedXml.XmlDsigNamespaceUrl);
if (!Utils.VerifyAttributes(signedInfoElement, "Id"))
{
throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_InvalidElement"), "SignedInfo");
}
// CanonicalizationMethod -- must be present
XmlNodeList canonicalizationMethodNodes = signedInfoElement.SelectNodes("ds:CanonicalizationMethod", nsm);
if (canonicalizationMethodNodes == null || canonicalizationMethodNodes.Count == 0 || (!Utils.GetAllowAdditionalSignatureNodes() && canonicalizationMethodNodes.Count > 1))
{
throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_InvalidElement"), "SignedInfo/CanonicalizationMethod");
}
XmlElement canonicalizationMethodElement = canonicalizationMethodNodes.Item(0) as XmlElement;
expectedChildNodes += canonicalizationMethodNodes.Count;
m_canonicalizationMethod = Utils.GetAttribute(canonicalizationMethodElement, "Algorithm", SignedXml.XmlDsigNamespaceUrl);
if ((m_canonicalizationMethod == null && !Utils.GetSkipSignatureAttributeEnforcement()) || !Utils.VerifyAttributes(canonicalizationMethodElement, "Algorithm"))
{
throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_InvalidElement"), "SignedInfo/CanonicalizationMethod");
}
m_canonicalizationMethodTransform = null;
if (canonicalizationMethodElement.ChildNodes.Count > 0)
{
this.CanonicalizationMethodObject.LoadInnerXml(canonicalizationMethodElement.ChildNodes);
}
// SignatureMethod -- must be present
XmlNodeList signatureMethodNodes = signedInfoElement.SelectNodes("ds:SignatureMethod", nsm);
if (signatureMethodNodes == null || signatureMethodNodes.Count == 0 || (!Utils.GetAllowAdditionalSignatureNodes() && signatureMethodNodes.Count > 1))
{
throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_InvalidElement"), "SignedInfo/SignatureMethod");
}
XmlElement signatureMethodElement = signatureMethodNodes.Item(0) as XmlElement;
expectedChildNodes += signatureMethodNodes.Count;
m_signatureMethod = Utils.GetAttribute(signatureMethodElement, "Algorithm", SignedXml.XmlDsigNamespaceUrl);
if ((m_signatureMethod == null && !Utils.GetSkipSignatureAttributeEnforcement()) || !Utils.VerifyAttributes(signatureMethodElement, "Algorithm"))
{
throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_InvalidElement"), "SignedInfo/SignatureMethod");
}
// Now get the output length if we are using a MAC algorithm
XmlElement signatureLengthElement = signatureMethodElement.SelectSingleNode("ds:HMACOutputLength", nsm) as XmlElement;
if (signatureLengthElement != null)
{
m_signatureLength = signatureLengthElement.InnerXml;
}
// flush out any reference that was there
m_references.Clear();
// Reference - 0 or more
XmlNodeList referenceNodes = signedInfoElement.SelectNodes("ds:Reference", nsm);
if (referenceNodes != null)
{
if (referenceNodes.Count > Utils.GetMaxReferencesPerSignedInfo())
{
throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_InvalidElement"), "SignedInfo/Reference");
}
foreach (XmlNode node in referenceNodes)
{
XmlElement referenceElement = node as XmlElement;
Reference reference = new Reference();
AddReference(reference);
reference.LoadXml(referenceElement);
}
expectedChildNodes += referenceNodes.Count;
}
// Verify that there aren't any extra nodes that aren't allowed
if (!Utils.GetAllowAdditionalSignatureNodes() && (signedInfoElement.SelectNodes("*").Count != expectedChildNodes))
{
throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_InvalidElement"), "SignedInfo");
}
// Save away the cached value
m_cachedXml = signedInfoElement;
}
