org.bouncycastle.asn1.cms.SignerIdentifier.java Source code

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Here is the source code for org.bouncycastle.asn1.cms.SignerIdentifier.java

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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;

/**
 * <a href="http://tools.ietf.org/html/rfc5652#section-5.3">RFC 5652</a>:
 * Identify who signed the containing {@link SignerInfo} object.
 * <p>
 * The certificates referred to by this are at containing {@link SignedData} structure.
 * <p>
 * <pre>
 * SignerIdentifier ::= CHOICE {
 *     issuerAndSerialNumber IssuerAndSerialNumber,
 *     subjectKeyIdentifier [0] SubjectKeyIdentifier 
 * }
 *
 * SubjectKeyIdentifier ::= OCTET STRING
 * </pre>
 */
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.
     * <p>
     * Accepted inputs:
     * <ul>
     * <li> null &rarr; null
     * <li> {@link SignerIdentifier} object
     * <li> {@link IssuerAndSerialNumber} object
     * <li> {@link org.bouncycastle.asn1.ASN1OctetString#getInstance(java.lang.Object) ASN1OctetString} input formats with SignerIdentifier structure inside
     * <li> {@link org.bouncycastle.asn1.ASN1Primitive ASN1Primitive} for SignerIdentifier constructor.
     * </ul>
     *
     * @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();
    }
}