/// <summary>
/// Validates the signature using the public part of the asymmetric key given as parameter.
/// </summary>
/// <param name="key"></param>
/// <returns><code>true</code> if the signature is present and can be verified using the given key.
/// <code>false</code> if the signature is present, but can't be verified using the given key.</returns>
/// <exception cref="InvalidOperationException">If the query is not signed, and therefore cannot have its signature verified. Use
/// the <code>IsSigned</code> property to check for this situation before calling this method.</exception>
public bool CheckSignature(AsymmetricAlgorithm key)
{
if (key == null)
{
throw new ArgumentNullException("key");
}
if (!IsSigned)
{
throw new InvalidOperationException("Query is not signed, so there is no signature to verify.");
}
var signatureProvider = SignatureProviderFactory.CreateFromHashingAlgorithmSignatureUri(_signatureAlgorithm);
return(signatureProvider.VerifySignature(key, Encoding.UTF8.GetBytes(_signedquery), DecodeSignature()));
}