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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.4.

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package org.bouncycastle.asn1.cms;

import org.bouncycastle.asn1.ASN1Choice;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERTaggedObject;

/**
 * RFC 5652:
 * Identify who signed the containing {@link SignerInfo} object.
 * 
 * The certificates referred to by this are at containing {@link SignedData} structure.
 * 

 *  
 * SignerIdentifier ::= CHOICE {
 *     issuerAndSerialNumber IssuerAndSerialNumber,
 *     subjectKeyIdentifier [0] SubjectKeyIdentifier 
 * }
 *
 * SubjectKeyIdentifier ::= OCTET STRING
 *


 */
public class SignerIdentifier
    extends ASN1Object
    implements ASN1Choice
{
    private ASN1Encodable id;
    
    public SignerIdentifier(
        IssuerAndSerialNumber id)
    {
        this.id = id;
    }
    
    public SignerIdentifier(
        ASN1OctetString id)
    {
        this.id = new DERTaggedObject(false, 0, id);
    }
    
    public SignerIdentifier(
        ASN1Primitive id)
    {
        this.id = id;
    }
    
    /**
     * Return a SignerIdentifier object from the given object.
     *

* Accepted inputs: * * null → null * {@link SignerIdentifier} object * {@link IssuerAndSerialNumber} object * {@link org.bouncycastle.asn1.ASN1OctetString#getInstance(java.lang.Object) ASN1OctetString} input formats with SignerIdentifier structure inside * {@link org.bouncycastle.asn1.ASN1Primitive ASN1Primitive} for SignerIdentifier constructor. * * * @param o the object we want converted. * @exception IllegalArgumentException if the object cannot be converted. */ public static SignerIdentifier getInstance( Object o) { if (o == null || o instanceof SignerIdentifier) { return (SignerIdentifier)o; } if (o instanceof IssuerAndSerialNumber) { return new SignerIdentifier((IssuerAndSerialNumber)o); } if (o instanceof ASN1OctetString) { return new SignerIdentifier((ASN1OctetString)o); } if (o instanceof ASN1Primitive) { return new SignerIdentifier((ASN1Primitive)o); } throw new IllegalArgumentException( "Illegal object in SignerIdentifier: " + o.getClass().getName()); } public boolean isTagged() { return (id instanceof ASN1TaggedObject); } public ASN1Encodable getId() { if (id instanceof ASN1TaggedObject) { return ASN1OctetString.getInstance((ASN1TaggedObject)id, false); } return id; } /** * Produce an object suitable for an ASN1OutputStream. */ public ASN1Primitive toASN1Primitive() { return id.toASN1Primitive(); } }