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

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

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package org.bouncycastle.asn1.cms;

import java.util.Enumeration;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1Set;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.BERSequence;
import org.bouncycastle.asn1.DERTaggedObject;

/**
 * <a href="http://tools.ietf.org/html/rfc5652#section-6.1">RFC 5652</a> EnvelopedData object.
 * <pre>
 * EnvelopedData ::= SEQUENCE {
 *     version CMSVersion,
 *     originatorInfo [0] IMPLICIT OriginatorInfo OPTIONAL,
 *     recipientInfos RecipientInfos,
 *     encryptedContentInfo EncryptedContentInfo,
 *     unprotectedAttrs [1] IMPLICIT UnprotectedAttributes OPTIONAL 
 * }
 * </pre>
 */
public class EnvelopedData extends ASN1Object {
    private ASN1Integer version;
    private OriginatorInfo originatorInfo;
    private ASN1Set recipientInfos;
    private EncryptedContentInfo encryptedContentInfo;
    private ASN1Set unprotectedAttrs;

    public EnvelopedData(OriginatorInfo originatorInfo, ASN1Set recipientInfos,
            EncryptedContentInfo encryptedContentInfo, ASN1Set unprotectedAttrs) {
        version = new ASN1Integer(calculateVersion(originatorInfo, recipientInfos, unprotectedAttrs));

        this.originatorInfo = originatorInfo;
        this.recipientInfos = recipientInfos;
        this.encryptedContentInfo = encryptedContentInfo;
        this.unprotectedAttrs = unprotectedAttrs;
    }

    public EnvelopedData(OriginatorInfo originatorInfo, ASN1Set recipientInfos,
            EncryptedContentInfo encryptedContentInfo, Attributes unprotectedAttrs) {
        version = new ASN1Integer(
                calculateVersion(originatorInfo, recipientInfos, ASN1Set.getInstance(unprotectedAttrs)));

        this.originatorInfo = originatorInfo;
        this.recipientInfos = recipientInfos;
        this.encryptedContentInfo = encryptedContentInfo;
        this.unprotectedAttrs = ASN1Set.getInstance(unprotectedAttrs);
    }

    /**
     * @deprecated use getInstance()
     */
    public EnvelopedData(ASN1Sequence seq) {
        int index = 0;

        version = (ASN1Integer) seq.getObjectAt(index++);

        Object tmp = seq.getObjectAt(index++);

        if (tmp instanceof ASN1TaggedObject) {
            originatorInfo = OriginatorInfo.getInstance((ASN1TaggedObject) tmp, false);
            tmp = seq.getObjectAt(index++);
        }

        recipientInfos = ASN1Set.getInstance(tmp);

        encryptedContentInfo = EncryptedContentInfo.getInstance(seq.getObjectAt(index++));

        if (seq.size() > index) {
            unprotectedAttrs = ASN1Set.getInstance((ASN1TaggedObject) seq.getObjectAt(index), false);
        }
    }

    /**
     * Return an EnvelopedData object from a tagged object.
     *
     * @param obj the tagged object holding the object we want.
     * @param explicit true if the object is meant to be explicitly
     *              tagged false otherwise.
     * @exception IllegalArgumentException if the object held by the
     *          tagged object cannot be converted.
     */
    public static EnvelopedData getInstance(ASN1TaggedObject obj, boolean explicit) {
        return getInstance(ASN1Sequence.getInstance(obj, explicit));
    }

    /**
     * Return an EnvelopedData object from the given object.
     * <p>
     * Accepted inputs:
     * <ul>
     * <li> null &rarr; null
     * <li> {@link EnvelopedData} object
     * <li> {@link org.bouncycastle.asn1.ASN1Sequence#getInstance(java.lang.Object) ASN1Sequence} input formats with EnvelopedData structure inside
     * </ul>
     *
     * @param obj the object we want converted.
     * @exception IllegalArgumentException if the object cannot be converted.
     */
    public static EnvelopedData getInstance(Object obj) {
        if (obj instanceof EnvelopedData) {
            return (EnvelopedData) obj;
        }

        if (obj != null) {
            return new EnvelopedData(ASN1Sequence.getInstance(obj));
        }

        return null;
    }

    public ASN1Integer getVersion() {
        return version;
    }

    public OriginatorInfo getOriginatorInfo() {
        return originatorInfo;
    }

    public ASN1Set getRecipientInfos() {
        return recipientInfos;
    }

    public EncryptedContentInfo getEncryptedContentInfo() {
        return encryptedContentInfo;
    }

    public ASN1Set getUnprotectedAttrs() {
        return unprotectedAttrs;
    }

    /** 
     * Produce an object suitable for an ASN1OutputStream.
     */
    public ASN1Primitive toASN1Primitive() {
        ASN1EncodableVector v = new ASN1EncodableVector(5);

        v.add(version);

        if (originatorInfo != null) {
            v.add(new DERTaggedObject(false, 0, originatorInfo));
        }

        v.add(recipientInfos);
        v.add(encryptedContentInfo);

        if (unprotectedAttrs != null) {
            v.add(new DERTaggedObject(false, 1, unprotectedAttrs));
        }

        return new BERSequence(v);
    }

    public static int calculateVersion(OriginatorInfo originatorInfo, ASN1Set recipientInfos,
            ASN1Set unprotectedAttrs) {
        int version;

        if (originatorInfo != null || unprotectedAttrs != null) {
            version = 2;
        } else {
            version = 0;

            Enumeration e = recipientInfos.getObjects();

            while (e.hasMoreElements()) {
                RecipientInfo ri = RecipientInfo.getInstance(e.nextElement());

                if (ri.getVersion().intValueExact() != version) {
                    version = 2;
                    break;
                }
            }
        }

        return version;
    }
}