algorithmidentifier.java

java 文件下载器。可自定义

// Decompiled by Jad v1.5.8e2. Copyright 2001 Pavel Kouznetsov.
// Jad home page: http://kpdus.tripod.com/jad.html
// Decompiler options: packimports(3) fieldsfirst ansi space 
// Source File Name:   AlgorithmIdentifier.java

package org.bouncycastle.asn1.x509;

import org.bouncycastle.asn1.*;

public class AlgorithmIdentifier extends ASN1Encodable
{

	private DERObjectIdentifier objectId;
	private DEREncodable parameters;
	private boolean parametersDefined;

	public static AlgorithmIdentifier getInstance(ASN1TaggedObject obj, boolean explicit)
	{
		return getInstance(ASN1Sequence.getInstance(obj, explicit));
	}

	public static AlgorithmIdentifier getInstance(Object obj)
	{
		if (obj == null || (obj instanceof AlgorithmIdentifier))
			return (AlgorithmIdentifier)obj;
		if (obj instanceof DERObjectIdentifier)
			return new AlgorithmIdentifier((DERObjectIdentifier)obj);
		if (obj instanceof String)
			return new AlgorithmIdentifier((String)obj);
		if (obj instanceof ASN1Sequence)
			return new AlgorithmIdentifier((ASN1Sequence)obj);
		else
			throw new IllegalArgumentException("unknown object in factory");
	}

	public AlgorithmIdentifier(DERObjectIdentifier objectId)
	{
		parametersDefined = false;
		this.objectId = objectId;
	}

	public AlgorithmIdentifier(String objectId)
	{
		parametersDefined = false;
		this.objectId = new DERObjectIdentifier(objectId);
	}

	public AlgorithmIdentifier(DERObjectIdentifier objectId, DEREncodable parameters)
	{
		parametersDefined = false;
		parametersDefined = true;
		this.objectId = objectId;
		this.parameters = parameters;
	}

	public AlgorithmIdentifier(ASN1Sequence seq)
	{
		parametersDefined = false;
		if (seq.size() < 1 || seq.size() > 2)
			throw new IllegalArgumentException((new StringBuilder()).append("Bad sequence size: ").append(seq.size()).toString());
		objectId = DERObjectIdentifier.getInstance(seq.getObjectAt(0));
		if (seq.size() == 2)
		{
			parametersDefined = true;
			parameters = seq.getObjectAt(1);
		} else
		{
			parameters = null;
		}
	}

	public DERObjectIdentifier getObjectId()
	{
		return objectId;
	}

	public DEREncodable getParameters()
	{
		return parameters;
	}

	public DERObject toASN1Object()
	{
		ASN1EncodableVector v = new ASN1EncodableVector();
		v.add(objectId);
		if (parametersDefined)
			v.add(parameters);
		return new DERSequence(v);
	}
}