using System;

namespace Org.BouncyCastle.Asn1.Pkcs;

public class PbeS2Parameters : Asn1Encodable
{
	private readonly KeyDerivationFunc func;

	private readonly EncryptionScheme scheme;

	public KeyDerivationFunc KeyDerivationFunc => func;

	public EncryptionScheme EncryptionScheme => scheme;

	public static PbeS2Parameters GetInstance(object obj)
	{
		if (obj == null)
		{
			return null;
		}
		if (obj is PbeS2Parameters result)
		{
			return result;
		}
		return new PbeS2Parameters(Asn1Sequence.GetInstance(obj));
	}

	public PbeS2Parameters(KeyDerivationFunc keyDevFunc, EncryptionScheme encScheme)
	{
		func = keyDevFunc;
		scheme = encScheme;
	}

	[Obsolete("Use GetInstance() instead")]
	public PbeS2Parameters(Asn1Sequence seq)
	{
		if (seq.Count != 2)
		{
			throw new ArgumentException("Wrong number of elements in sequence", "seq");
		}
		Asn1Sequence asn1Sequence = (Asn1Sequence)seq[0].ToAsn1Object();
		if (asn1Sequence[0].Equals(PkcsObjectIdentifiers.IdPbkdf2))
		{
			func = new KeyDerivationFunc(PkcsObjectIdentifiers.IdPbkdf2, Pbkdf2Params.GetInstance(asn1Sequence[1]));
		}
		else
		{
			func = new KeyDerivationFunc(asn1Sequence);
		}
		scheme = EncryptionScheme.GetInstance(seq[1].ToAsn1Object());
	}

	public override Asn1Object ToAsn1Object()
	{
		return new DerSequence(func, scheme);
	}
}