package org.bouncycastle.asn1.cms;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DEREncodable;
import org.bouncycastle.asn1.DERInteger;
import org.bouncycastle.asn1.DERObject;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERTaggedObject;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;

public class KeyAgreeRecipientInfo
    implements DEREncodable
{
	private DERInteger                  version;
	private OriginatorIdentifierOrKey   originator;
	private ASN1OctetString             ukm;
	private AlgorithmIdentifier         keyEncryptionAlgorithm;
	private ASN1Sequence                recipientEncryptedKeys;
	
	public KeyAgreeRecipientInfo(
        OriginatorIdentifierOrKey   originator,
        ASN1OctetString             ukm,
        AlgorithmIdentifier         keyEncryptionAlgorithm,
        ASN1Sequence                recipientEncryptedKeys)
    {
        this.version = new DERInteger(3);
        this.originator = originator;
        this.ukm = ukm;
        this.keyEncryptionAlgorithm = keyEncryptionAlgorithm;
	}
	
	public KeyAgreeRecipientInfo(
        ASN1Sequence seq)
    {
		int index = 0;
		
		version = (DERInteger)seq.getObjectAt(index++);
        originator = OriginatorIdentifierOrKey.getInstance(
                            (ASN1TaggedObject)seq.getObjectAt(index++), true);

        if (seq.getObjectAt(index) instanceof ASN1TaggedObject)
        {
            ukm = ASN1OctetString.getInstance(
                            (ASN1TaggedObject)seq.getObjectAt(index++), true);
        }

		keyEncryptionAlgorithm = AlgorithmIdentifier.getInstance(
                                                seq.getObjectAt(index++));

		recipientEncryptedKeys = (ASN1Sequence)seq.getObjectAt(index++);
	}
	
    /**
     * return a KeyAgreeRecipientInfo 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 KeyAgreeRecipientInfo getInstance(
        ASN1TaggedObject    obj,
        boolean             explicit)
    {
		return getInstance(ASN1Sequence.getInstance(obj, explicit));
	}
	
    /**
     * return a KeyAgreeRecipientInfo object from the given object.
     *
     * @param obj the object we want converted.
     * @exception IllegalArgumentException if the object cannot be converted.
     */
	public static KeyAgreeRecipientInfo getInstance(
        Object obj)
    {
		if (obj == null || obj instanceof KeyAgreeRecipientInfo)
        {
			return (KeyAgreeRecipientInfo)obj;
		}
		
		if (obj instanceof ASN1Sequence)
        {
			return new KeyAgreeRecipientInfo((ASN1Sequence)obj);
		}
		
		throw new IllegalArgumentException(
        "Illegal object in KeyAgreeRecipientInfo: " + obj.getClass().getName());

	} 

	public DERInteger getVersion()
    {
		return version;
	}

	public OriginatorIdentifierOrKey getOriginator()
    {
		return originator;
	}

	public ASN1OctetString getUserKeyingMaterial()
    {
		return ukm;
	}

	public AlgorithmIdentifier getKeyEncryptionAlgorithm()
    {
		return keyEncryptionAlgorithm;
	}

	public ASN1Sequence getRecipientEncryptedKeys()
    {
		return recipientEncryptedKeys;
	}

    /** 
     * <pre>
     * KeyAgreeRecipientInfo ::= SEQUENCE {
     * 	version CMSVersion,  -- always set to 3
     * 	originator [0] EXPLICIT OriginatorIdentifierOrKey,
     * 	ukm [1] EXPLICIT UserKeyingMaterial OPTIONAL,
     * 	keyEncryptionAlgorithm KeyEncryptionAlgorithmIdentifier,
     * 	recipientEncryptedKeys RecipientEncryptedKeys 
     * }
     * </pre>
     */
	public DERObject getDERObject()
    {
        ASN1EncodableVector  v = new ASN1EncodableVector();

		v.add(version);
		v.add(new DERTaggedObject(true, 0, originator));
		
		if (ukm != null)
        {
			v.add(new DERTaggedObject(true, 1, ukm));
		}
		
		v.add(keyEncryptionAlgorithm);
		v.add(recipientEncryptedKeys);

		return new DERSequence(v);
	}
}
