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-5.3">RFC 5652</a>:
013 * Identify who signed the containing {@link SignerInfo} object.
014 * <p>
015 * The certificates referred to by this are at containing {@link SignedData} structure.
016 * <p>
017 * <pre>
018 * SignerIdentifier ::= CHOICE {
019 *     issuerAndSerialNumber IssuerAndSerialNumber,
020 *     subjectKeyIdentifier [0] SubjectKeyIdentifier 
021 * }
022 *
023 * SubjectKeyIdentifier ::= OCTET STRING
024 * </pre>
025 */
026public class SignerIdentifier
027    extends ASN1Object
028    implements ASN1Choice
029{
030    private ASN1Encodable id;
031    
032    public SignerIdentifier(
033        IssuerAndSerialNumber id)
034    {
035        this.id = id;
036    }
037    
038    public SignerIdentifier(
039        ASN1OctetString id)
040    {
041        this.id = new DERTaggedObject(false, 0, id);
042    }
043    
044    public SignerIdentifier(
045        ASN1Primitive id)
046    {
047        this.id = id;
048    }
049    
050    /**
051     * Return a SignerIdentifier object from the given object.
052     * <p>
053     * Accepted inputs:
054     * <ul>
055     * <li> null &rarr; null
056     * <li> {@link SignerIdentifier} object
057     * <li> {@link IssuerAndSerialNumber} object
058     * <li> {@link org.bouncycastle.asn1.ASN1OctetString#getInstance(java.lang.Object) ASN1OctetString} input formats with SignerIdentifier structure inside
059     * <li> {@link org.bouncycastle.asn1.ASN1Primitive ASN1Primitive} for SignerIdentifier constructor.
060     * </ul>
061     *
062     * @param o the object we want converted.
063     * @exception IllegalArgumentException if the object cannot be converted.
064     */
065    public static SignerIdentifier getInstance(
066        Object o)
067    {
068        if (o == null || o instanceof SignerIdentifier)
069        {
070            return (SignerIdentifier)o;
071        }
072        
073        if (o instanceof IssuerAndSerialNumber)
074        {
075            return new SignerIdentifier((IssuerAndSerialNumber)o);
076        }
077        
078        if (o instanceof ASN1OctetString)
079        {
080            return new SignerIdentifier((ASN1OctetString)o);
081        }
082        
083        if (o instanceof ASN1Primitive)
084        {
085            return new SignerIdentifier((ASN1Primitive)o);
086        }
087        
088        throw new IllegalArgumentException(
089             "Illegal object in SignerIdentifier: " + o.getClass().getName());
090    } 
091
092    public boolean isTagged()
093    {
094        return (id instanceof ASN1TaggedObject);
095    }
096
097    public ASN1Encodable getId()
098    {
099        if (id instanceof ASN1TaggedObject)
100        {
101            return ASN1OctetString.getInstance((ASN1TaggedObject)id, false);
102        }
103
104        return id;
105    }
106
107    /** 
108     * Produce an object suitable for an ASN1OutputStream.
109     */
110    public ASN1Primitive toASN1Primitive()
111    {
112        return id.toASN1Primitive();
113    }
114}