/// <summary>
/// When finished with a <see cref="SignatureProvider"/> call this method for cleanup. The default behavior is to call <see cref="SignatureProvider.Dispose()"/>
/// </summary>
/// <param name="signatureProvider"><see cref="SignatureProvider"/> to be released.</param>
public virtual void ReleaseSignatureProvider(SignatureProvider signatureProvider)
{
if (signatureProvider != null)
{
signatureProvider.Dispose();
}
}
private SignatureProvider CreateSignatureProvider(SecurityKey key, string algorithm, bool willCreateSignatures)
{
if (key == null)
{
throw LogHelper.LogArgumentNullException(nameof(key));
}
if (string.IsNullOrEmpty(algorithm))
{
throw LogHelper.LogArgumentNullException(nameof(algorithm));
}
if (CustomCryptoProvider != null && CustomCryptoProvider.IsSupportedAlgorithm(algorithm, key, willCreateSignatures))
{
SignatureProvider signatureProvider = CustomCryptoProvider.Create(algorithm, key, willCreateSignatures) as SignatureProvider;
if (signatureProvider == null)
{
throw LogHelper.LogExceptionMessage(new InvalidOperationException(String.Format(CultureInfo.InvariantCulture, LogMessages.IDX10646, algorithm, key, typeof(SignatureProvider))));
}
return(signatureProvider);
}
if (!IsSupportedAlgorithm(algorithm, key))
{
throw LogHelper.LogExceptionMessage(new ArgumentException(String.Format(CultureInfo.InvariantCulture, LogMessages.IDX10634, algorithm, key)));
}
AsymmetricSecurityKey asymmetricKey = key as AsymmetricSecurityKey;
if (asymmetricKey != null)
{
return(new AsymmetricSignatureProvider(asymmetricKey, algorithm, willCreateSignatures));
}
SymmetricSecurityKey symmetricKey = key as SymmetricSecurityKey;
if (symmetricKey != null)
{
return(new SymmetricSignatureProvider(symmetricKey, algorithm));
}
JsonWebKey jsonWebKey = key as JsonWebKey;
if (jsonWebKey != null)
{
if (jsonWebKey.Kty != null)
{
if (jsonWebKey.Kty == JsonWebAlgorithmsKeyTypes.RSA || jsonWebKey.Kty == JsonWebAlgorithmsKeyTypes.EllipticCurve)
{
return(new AsymmetricSignatureProvider(key, algorithm, willCreateSignatures));
}
if (jsonWebKey.Kty == JsonWebAlgorithmsKeyTypes.Octet)
{
return(new SymmetricSignatureProvider(key, algorithm));
}
}
}
// TODO improve this message. Nothing about JsonWebKey is mentioned.
throw LogHelper.LogExceptionMessage(new ArgumentException(String.Format(CultureInfo.InvariantCulture, LogMessages.IDX10600, typeof(SignatureProvider), typeof(SecurityKey), typeof(AsymmetricSecurityKey), typeof(SymmetricSecurityKey), key.GetType())));
}