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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.ASN1Boolean;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERIA5String;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERUTF8String;

/**
 * RFC 5544:
 * Binding Documents with Time-Stamps; MetaData object.
 * 
 *  
 * MetaData ::= SEQUENCE {
 *   hashProtected        BOOLEAN,
 *   fileName             UTF8String OPTIONAL,
 *   mediaType            IA5String OPTIONAL,
 *   otherMetaData        Attributes OPTIONAL
 * }
 *


 */
public class MetaData
    extends ASN1Object
{
    private ASN1Boolean hashProtected;
    private DERUTF8String fileName;
    private DERIA5String  mediaType;
    private Attributes otherMetaData;

    public MetaData(
        ASN1Boolean hashProtected,
        DERUTF8String fileName,
        DERIA5String mediaType,
        Attributes otherMetaData)
    {
        this.hashProtected = hashProtected;
        this.fileName = fileName;
        this.mediaType = mediaType;
        this.otherMetaData = otherMetaData;
    }

    private MetaData(ASN1Sequence seq)
    {
        this.hashProtected = ASN1Boolean.getInstance(seq.getObjectAt(0));

        int index = 1;

        if (index < seq.size() && seq.getObjectAt(index) instanceof DERUTF8String)
        {
            this.fileName = DERUTF8String.getInstance(seq.getObjectAt(index++));
        }
        if (index < seq.size() && seq.getObjectAt(index) instanceof DERIA5String)
        {
            this.mediaType = DERIA5String.getInstance(seq.getObjectAt(index++));
        }
        if (index < seq.size())
        {
            this.otherMetaData = Attributes.getInstance(seq.getObjectAt(index++));
        }
    }

    /**
     * Return a MetaData object from the given object.
     *

* Accepted inputs: * * null → null * {@link MetaData} object * {@link org.bouncycastle.asn1.ASN1Sequence#getInstance(java.lang.Object) ASN1Sequence} input formats with MetaData structure inside * * * @param obj the object we want converted. * @exception IllegalArgumentException if the object cannot be converted. */ public static MetaData getInstance(Object obj) { if (obj instanceof MetaData) { return (MetaData)obj; } else if (obj != null) { return new MetaData(ASN1Sequence.getInstance(obj)); } return null; } public ASN1Primitive toASN1Primitive() { ASN1EncodableVector v = new ASN1EncodableVector(); v.add(hashProtected); if (fileName != null) { v.add(fileName); } if (mediaType != null) { v.add(mediaType); } if (otherMetaData != null) { v.add(otherMetaData); } return new DERSequence(v); } public boolean isHashProtected() { return hashProtected.isTrue(); } public DERUTF8String getFileName() { return this.fileName; } public DERIA5String getMediaType() { return this.mediaType; } public Attributes getOtherMetaData() { return otherMetaData; } }