如何使用C#验证证书？

我使用的是visual studio 2005，我想用应用程序证书验证SAML响应证书，这里我从身份提供程序获得了一个SAML响应，它用证书发送SAML响应，并且应用程序分别拥有相同的证书，这里我需要检查SAML响应是否具有SAML证书。你能请任何人帮我吗？ 谢谢你，

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Gopi G

以下是示例，如何验证完整SAML身份验证响应的签名。断言签名验证与此类似

const string XpathResponseSignatureCertificate = "/samlp:Response/ds:Signature/ds:KeyInfo/ds:X509Data/ds:X509Certificate";

XmlElement xmlResponseSignature =  GetSignatureElement(authenticationResponse);

// Get certificate from IdP metadata document
X509Certificate2 signingCertificate = identityProvider.SigningCertificate;

XmlDocument responseXmlDocument = GetResponseAsXmlDocument(string samlResponse);

XmlNode responseSignatureXmlNode = this.responseXmlDocument.DocumentElement.SelectSingleNode(XpathResponseSignatureCertificate, this.namespaceManager);
XmlElement xmlSignature = responseSignatureXmlNode .InnerText.Trim()

SignedXml signedXml = new SignedXml(ResponseXmlDocumen;
signedXml.LoadXml((XmlElement)xmlSignature);

if (signedXml.CheckSignature(cert, true) == false)
{
    throw new Exception("Not valid signature");
}

bool isReferenceValid = false;
foreach (Reference reference in signedXml.SignedInfo.References)
{
    string refValue = reference.Uri.Substring(1);
    if (refValue  == authenticationResponse.Id)
    {
        isReferenceValid = true;
    }
}

if (isReferenceValid == false)
{
    throw new Exception("Not valid signature reference");
}