001package org.apache.commons.ssl.org.bouncycastle.asn1.cms;
002
003import org.apache.commons.ssl.org.bouncycastle.asn1.ASN1Choice;
004import org.apache.commons.ssl.org.bouncycastle.asn1.ASN1Encodable;
005import org.apache.commons.ssl.org.bouncycastle.asn1.ASN1Object;
006import org.apache.commons.ssl.org.bouncycastle.asn1.ASN1OctetString;
007import org.apache.commons.ssl.org.bouncycastle.asn1.ASN1Primitive;
008import org.apache.commons.ssl.org.bouncycastle.asn1.ASN1TaggedObject;
009import org.apache.commons.ssl.org.bouncycastle.asn1.DERTaggedObject;
010
011/**
012 * <a href="http://tools.ietf.org/html/rfc5652#section-6.2.1">RFC 5652</a>:
013 * Content encryption key delivery mechanisms.
014 * <pre>
015 * RecipientIdentifier ::= CHOICE {
016 *     issuerAndSerialNumber IssuerAndSerialNumber,
017 *     subjectKeyIdentifier [0] SubjectKeyIdentifier 
018 * }
019 *
020 * SubjectKeyIdentifier ::= OCTET STRING
021 * </pre>
022 */
023public class RecipientIdentifier
024    extends ASN1Object
025    implements ASN1Choice
026{
027    private ASN1Encodable id;
028    
029    public RecipientIdentifier(
030        IssuerAndSerialNumber id)
031    {
032        this.id = id;
033    }
034    
035    public RecipientIdentifier(
036        ASN1OctetString id)
037    {
038        this.id = new DERTaggedObject(false, 0, id);
039    }
040    
041    public RecipientIdentifier(
042        ASN1Primitive id)
043    {
044        this.id = id;
045    }
046    
047    /**
048     * Return a RecipientIdentifier object from the given object.
049     * <p>
050     * Accepted inputs:
051     * <ul>
052     * <li> null &rarr; null
053     * <li> {@link RecipientIdentifier} object
054     * <li> {@link IssuerAndSerialNumber} object
055     * <li> {@link org.bouncycastle.asn1.ASN1OctetString#getInstance(java.lang.Object) ASN1OctetString} input formats (OctetString, byte[]) with value of KeyIdentifier in DER form
056     * <li> {@link org.bouncycastle.asn1.ASN1Primitive ASN1Primitive} for RecipientIdentifier constructor
057     * </ul>
058     *
059     * @param o the object we want converted.
060     * @exception IllegalArgumentException if the object cannot be converted.
061     */
062    public static RecipientIdentifier getInstance(
063        Object o)
064    {
065        if (o == null || o instanceof RecipientIdentifier)
066        {
067            return (RecipientIdentifier)o;
068        }
069        
070        if (o instanceof IssuerAndSerialNumber)
071        {
072            return new RecipientIdentifier((IssuerAndSerialNumber)o);
073        }
074        
075        if (o instanceof ASN1OctetString)
076        {
077            return new RecipientIdentifier((ASN1OctetString)o);
078        }
079        
080        if (o instanceof ASN1Primitive)
081        {
082            return new RecipientIdentifier((ASN1Primitive)o);
083        }
084        
085        throw new IllegalArgumentException(
086          "Illegal object in RecipientIdentifier: " + o.getClass().getName());
087    } 
088
089    public boolean isTagged()
090    {
091        return (id instanceof ASN1TaggedObject);
092    }
093
094    public ASN1Encodable getId()
095    {
096        if (id instanceof ASN1TaggedObject)
097        {
098            return ASN1OctetString.getInstance((ASN1TaggedObject)id, false);
099        }
100
101        return IssuerAndSerialNumber.getInstance(id);
102    }
103
104    /** 
105     * Produce an object suitable for an ASN1OutputStream.
106     */
107    public ASN1Primitive toASN1Primitive()
108    {
109        return id.toASN1Primitive();
110    }
111}