using System;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Utilities;

namespace Org.BouncyCastle.Asn1.Ocsp;

public class Signature : Asn1Encodable
{
	internal AlgorithmIdentifier signatureAlgorithm;

	internal DerBitString signatureValue;

	internal Asn1Sequence certs;

	public AlgorithmIdentifier SignatureAlgorithm => signatureAlgorithm;

	public DerBitString SignatureValue => signatureValue;

	public Asn1Sequence Certs => certs;

	public static Signature GetInstance(Asn1TaggedObject obj, bool explicitly)
	{
		return GetInstance(Asn1Sequence.GetInstance(obj, explicitly));
	}

	public static Signature GetInstance(object obj)
	{
		if (obj == null || obj is Signature)
		{
			return (Signature)obj;
		}
		if (obj is Asn1Sequence)
		{
			return new Signature((Asn1Sequence)obj);
		}
		throw new ArgumentException("unknown object in factory: " + Platform.GetTypeName(obj), "obj");
	}

	public Signature(AlgorithmIdentifier signatureAlgorithm, DerBitString signatureValue)
		: this(signatureAlgorithm, signatureValue, null)
	{
	}

	public Signature(AlgorithmIdentifier signatureAlgorithm, DerBitString signatureValue, Asn1Sequence certs)
	{
		if (signatureAlgorithm == null)
		{
			throw new ArgumentException("signatureAlgorithm");
		}
		if (signatureValue == null)
		{
			throw new ArgumentException("signatureValue");
		}
		this.signatureAlgorithm = signatureAlgorithm;
		this.signatureValue = signatureValue;
		this.certs = certs;
	}

	private Signature(Asn1Sequence seq)
	{
		signatureAlgorithm = AlgorithmIdentifier.GetInstance(seq[0]);
		signatureValue = (DerBitString)seq[1];
		if (seq.Count == 3)
		{
			certs = Asn1Sequence.GetInstance((Asn1TaggedObject)seq[2], explicitly: true);
		}
	}

	public byte[] GetSignatureOctets()
	{
		return signatureValue.GetOctets();
	}

	public override Asn1Object ToAsn1Object()
	{
		Asn1EncodableVector asn1EncodableVector = new Asn1EncodableVector(signatureAlgorithm, signatureValue);
		if (certs != null)
		{
			asn1EncodableVector.Add(new DerTaggedObject(explicitly: true, 0, certs));
		}
		return new DerSequence(asn1EncodableVector);
	}
}