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.DERGeneralizedTime;
import org.bouncycastle.asn1.DERObject;
import org.bouncycastle.asn1.DERSequence;

public class RecipientKeyIdentifier
    implements DEREncodable
{
	private ASN1OctetString      subjectKeyIdentifier;
	private DERGeneralizedTime   date;
	private OtherKeyAttribute    other;

	public RecipientKeyIdentifier(
        ASN1OctetString         subjectKeyIdentifier,
        DERGeneralizedTime      date,
        OtherKeyAttribute       other)
    {
        this.subjectKeyIdentifier = subjectKeyIdentifier;
        this.date = date;
        this.other = other;
	}
	
	public RecipientKeyIdentifier(
        ASN1Sequence seq)
    {
		subjectKeyIdentifier = ASN1OctetString.getInstance(
                                                    seq.getObjectAt(0));
		
		switch(seq.size())
        {
        case 1:
            break;
        case 2:
            if (seq.getObjectAt(1) instanceof DERGeneralizedTime)
            {
                date = (DERGeneralizedTime)seq.getObjectAt(1); 
            }
            else
            {
                other = OtherKeyAttribute.getInstance(seq.getObjectAt(2));
            }
            break;
        case 3:
            date  = (DERGeneralizedTime)seq.getObjectAt(1);
            other = OtherKeyAttribute.getInstance(seq.getObjectAt(2));
            break;
        default:
            throw new IllegalArgumentException("Invalid KEKIdentifier");
		}
	}

    /**
     * return a RecipientKeyIdentifier object from a tagged object.
     *
     * @param _ato 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 RecipientKeyIdentifier getInstance(ASN1TaggedObject _ato, boolean _explicit) {
		return getInstance(ASN1Sequence.getInstance(_ato, _explicit));
	}
	
    /**
     * return a RecipientKeyIdentifier object from the given object.
     *
     * @param _obj the object we want converted.
     * @exception IllegalArgumentException if the object cannot be converted.
     */
	public static RecipientKeyIdentifier getInstance(Object _obj) {
		if(_obj == null || _obj instanceof RecipientKeyIdentifier) {
			return (RecipientKeyIdentifier)_obj;
		}
		
		if(_obj instanceof ASN1Sequence) {
			return new RecipientKeyIdentifier((ASN1Sequence)_obj);
		}
		
		throw new IllegalArgumentException("Invalid RecipientKeyIdentifier: " + _obj.getClass().getName());
	} 

	public ASN1OctetString getSubjectKeyIdentifier()
    {
		return subjectKeyIdentifier;
	}

	public DERGeneralizedTime getDate()
    {
		return date;
	}

	public OtherKeyAttribute getOtherKeyAttribute()
    {
		return other;
	}


    /** 
     * Produce an object suitable for an ASN1OutputStream.
     * <pre>
     * RecipientKeyIdentifier ::= SEQUENCE {
     * 	subjectKeyIdentifier SubjectKeyIdentifier,
     * 	date GeneralizedTime OPTIONAL,
     * 	other OtherKeyAttribute OPTIONAL 
     * }
     *
     * SubjectKeyIdentifier ::= OCTET STRING
     * </pre>
     */
	public DERObject getDERObject()
    {
        ASN1EncodableVector  v = new ASN1EncodableVector();

		v.add(subjectKeyIdentifier);
		
		if (date != null)
        {
			v.add(date);
		}

		if (other != null)
        {
			v.add(other);
		}
		
		return new DERSequence(v);
	}
}
