IMacFactory <A> IMacFactoryService.CreateMacFactory <A>(A algorithmDetails)
{
HmacEngineProvider macProvider = (HmacEngineProvider)hmacProviders[algorithmDetails.Algorithm];
int defaultMacSize = macProvider.MacSize;
if (key != null)
{
macProvider = new KeyedHmacEngineProvider(key, macProvider);
}
if (algorithmDetails.MacSizeInBits != defaultMacSize * 8)
{
macProvider = new TruncatedHmacEngineProvider(macProvider, algorithmDetails.MacSizeInBits);
}
return((IMacFactory <A>) new MacFactory <AuthenticationParameters>(algorithmDetails as AuthenticationParameters, macProvider, algorithmDetails.MacSizeInBits / 8));
}
internal TruncatedHmacEngineProvider(HmacEngineProvider provider, int macSizeInBits) : base(macSizeInBits)
{
this.provider = provider;
this.macSizeInBits = macSizeInBits;
}
internal KeyedHmacEngineProvider(ISymmetricKey key, HmacEngineProvider provider) : base(provider.MacSize * 8)
{
this.key = key;
this.provider = provider;
}