using System;
using System.IO;

namespace Org.BouncyCastle.Crypto.Tls;

public class DigitallySigned
{
	protected readonly SignatureAndHashAlgorithm mAlgorithm;

	protected readonly byte[] mSignature;

	public virtual SignatureAndHashAlgorithm Algorithm => mAlgorithm;

	public virtual byte[] Signature => mSignature;

	public DigitallySigned(SignatureAndHashAlgorithm algorithm, byte[] signature)
	{
		if (signature == null)
		{
			throw new ArgumentNullException("signature");
		}
		mAlgorithm = algorithm;
		mSignature = signature;
	}

	public virtual void Encode(Stream output)
	{
		if (mAlgorithm != null)
		{
			mAlgorithm.Encode(output);
		}
		TlsUtilities.WriteOpaque16(mSignature, output);
	}

	public static DigitallySigned Parse(TlsContext context, Stream input)
	{
		SignatureAndHashAlgorithm algorithm = null;
		if (TlsUtilities.IsTlsV12(context))
		{
			algorithm = SignatureAndHashAlgorithm.Parse(input);
		}
		byte[] signature = TlsUtilities.ReadOpaque16(input);
		return new DigitallySigned(algorithm, signature);
	}
}