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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 1.5 to JDK 1.8.

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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();
    }
}