package org.bouncycastle.asn1.cms;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERBitString;
import org.bouncycastle.asn1.DEREncodable;
import org.bouncycastle.asn1.DERObject;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;


public class OriginatorPublicKey
    implements DEREncodable
{
	private AlgorithmIdentifier algorithm;
	private DERBitString        publicKey;
	
	public OriginatorPublicKey(
        AlgorithmIdentifier algorithm,
        byte[]              publicKey)
    {
        this.algorithm = algorithm;
        this.publicKey = new DERBitString(publicKey);
	}
	
	public OriginatorPublicKey(
        ASN1Sequence seq)
    {
		algorithm = AlgorithmIdentifier.getInstance(seq.getObjectAt(0));
		publicKey = (DERBitString)seq.getObjectAt(1);
	}
	
    /**
     * return an OriginatorPublicKey object from a tagged object.
     *
     * @param obj the tagged object holding the object we want.
     * @param explicit true if the object is meant to be explicitly
     *              tagged false otherwise.
     * @exception IllegalArgumentException if the object held by the
     *          tagged object cannot be converted.
     */
	public static OriginatorPublicKey getInstance(
        ASN1TaggedObject    obj,
        boolean             explicit)
    {
		return getInstance(ASN1Sequence.getInstance(obj, explicit));
	}
	
    /**
     * return an OriginatorPublicKey object from the given object.
     *
     * @param obj the object we want converted.
     * @exception IllegalArgumentException if the object cannot be converted.
     */
	public static OriginatorPublicKey getInstance(
        Object obj)
    {
		if (obj == null || obj instanceof OriginatorPublicKey)
        {
			return (OriginatorPublicKey)obj;
		}
		
		if (obj instanceof ASN1Sequence)
        {
			return new OriginatorPublicKey((ASN1Sequence)obj);
		}
		
		throw new IllegalArgumentException("Invalid OriginatorPublicKey: " + obj.getClass().getName());
	} 

	public AlgorithmIdentifier getAlgorithm()
    {
		return algorithm;
	}

	public DERBitString getPublicKey()
    {
		return publicKey;
	}

    /** 
     * Produce an object suitable for an ASN1OutputStream.
     * <pre>
     * OriginatorPublicKey ::= SEQUENCE {
     * 	algorithm AlgorithmIdentifier,
     * 	publicKey BIT STRING 
     * }
     * </pre>
     */
	public DERObject getDERObject()
    {
        ASN1EncodableVector  v = new ASN1EncodableVector();

		v.add(algorithm);
		v.add(publicKey);

		return new DERSequence(v);
	}
}
