internal static bool VerifyDetachedSignature(
string detachedSignature,
string detachedSignatureAlgorithm,
string signedQueryString,
string certIdentifier
)
{
if (string.IsNullOrWhiteSpace(detachedSignature))
{
throw new ArgumentException("DetachedSignature not mentioned");
}
// Check that we have a signature algorithm, if not throw error
if (string.IsNullOrWhiteSpace(detachedSignatureAlgorithm))
{
throw new ArgumentException("DetachedSignature not mentioned");
}
X509Certificate2 samlEncryptionAndSigningKey = SignMessage.GetSamlEncryptionAndSigningKey(certIdentifier);
X509Certificate2Collection publicKeys = new X509Certificate2Collection();
publicKeys.Add(samlEncryptionAndSigningKey);
object hashAlgorithmProvider = GetAlgorithmProvider(detachedSignatureAlgorithm);
try
{
// Now verify
return(IsValidDetachedSignature(
signedQueryString,
hashAlgorithmProvider,
detachedSignature,
publicKeys));
}
finally
{
IDisposable hashAlgorithmProviderDisp = hashAlgorithmProvider as IDisposable;
if (hashAlgorithmProviderDisp != null)
{
hashAlgorithmProviderDisp.Dispose();
}
}
}
/// <summary>
/// Gets SamlSigned RedirectUrl
/// </summary>
/// <param name="destination"></param>
/// <param name="samlPayLoad"></param>
/// <param name="relayStateInput"></param>
/// <param name="signatureAlogrithm"></param>
/// <param name="certSubject"></param>
/// <returns></returns>
public static UrlBuilder GetSamlSignedRedirectUrl
(
string destination,
string samlPayLoad,
string relayStateInput,
string signatureAlogrithm,
string certSubject
)
{
UrlBuilder redirectUrl = new UrlBuilder()
{
Uri = new Uri(destination)
};
// Add the request parameters to the URL builder
redirectUrl.AddOrUpdateParameter("SAMLRequest", samlPayLoad.RedirectEncode());
if (!string.IsNullOrWhiteSpace(relayStateInput))
{
redirectUrl.AddOrUpdateParameter("RelayState", relayStateInput.RedirectEncode());
}
// Save signature algorithm
SignMessage.SignatureAlgorithm sigAlgorithm = (SignMessage.SignatureAlgorithm)Enum.Parse(typeof(SignMessage.SignatureAlgorithm), signatureAlogrithm, true);
AddSignatureToRequest(redirectUrl, sigAlgorithm);
X509Certificate2 samlEncryptionAndSigningKey = SignMessage.GetSamlEncryptionAndSigningKey(certSubject);
string signature = SignMessage.SignDetached(redirectUrl.GetQueryString(), samlEncryptionAndSigningKey, sigAlgorithm);
redirectUrl.AddOrUpdateParameter("Signature", signature);
string signedSamlRedirectMessage = redirectUrl.ToString();
return(redirectUrl);
}
