public static Asn1Sequence GetInstance(
Asn1TaggedObject obj,
bool explicitly)
{
Asn1Object inner = obj.GetObject();
if (explicitly)
{
if (!obj.IsExplicit())
throw new ArgumentException("object implicit - explicit expected.");
return (Asn1Sequence) inner;
}
//
// constructed object which appears to be explicitly tagged
// when it should be implicit means we have to add the
// surrounding sequence.
//
if (obj.IsExplicit())
{
if (obj is BerTaggedObject)
{
return new BerSequence(inner);
}
return new DerSequence(inner);
}
if (inner is Asn1Sequence)
{
return (Asn1Sequence) inner;
}
throw new ArgumentException("Unknown object in GetInstance: " + obj.GetType().FullName, "obj");
}