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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 java.util.Enumeration;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1OctetString;
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;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;

/**
 * RFC 5652 section 9.1:
 * The AuthenticatedData carries AuthAttributes and other data
 * which define what really is being signed.
 *  
 * AuthenticatedData ::= SEQUENCE {
 *       version CMSVersion,
 *       originatorInfo [0] IMPLICIT OriginatorInfo OPTIONAL,
 *       recipientInfos RecipientInfos,
 *       macAlgorithm MessageAuthenticationCodeAlgorithm,
 *       digestAlgorithm [1] DigestAlgorithmIdentifier OPTIONAL,
 *       encapContentInfo EncapsulatedContentInfo,
 *       authAttrs [2] IMPLICIT AuthAttributes OPTIONAL,
 *       mac MessageAuthenticationCode,
 *       unauthAttrs [3] IMPLICIT UnauthAttributes OPTIONAL }
 *
 * AuthAttributes ::= SET SIZE (1..MAX) OF Attribute
 *
 * UnauthAttributes ::= SET SIZE (1..MAX) OF Attribute
 *
 * MessageAuthenticationCode ::= OCTET STRING
 *


 */
public class AuthenticatedData
    extends ASN1Object
{
    private ASN1Integer version;
    private OriginatorInfo originatorInfo;
    private ASN1Set recipientInfos;
    private AlgorithmIdentifier macAlgorithm;
    private AlgorithmIdentifier digestAlgorithm;
    private ContentInfo encapsulatedContentInfo;
    private ASN1Set authAttrs;
    private ASN1OctetString mac;
    private ASN1Set unauthAttrs;

    public AuthenticatedData(
        OriginatorInfo originatorInfo,
        ASN1Set recipientInfos,
        AlgorithmIdentifier macAlgorithm,
        AlgorithmIdentifier digestAlgorithm,
        ContentInfo encapsulatedContent,
        ASN1Set authAttrs,
        ASN1OctetString mac,
        ASN1Set unauthAttrs)
    {
        if (digestAlgorithm != null || authAttrs != null)
        {
            if (digestAlgorithm == null || authAttrs == null)
            {
                throw new IllegalArgumentException("digestAlgorithm and authAttrs must be set together");
            }
        }

        version = new ASN1Integer(calculateVersion(originatorInfo));
        
        this.originatorInfo = originatorInfo;
        this.macAlgorithm = macAlgorithm;
        this.digestAlgorithm = digestAlgorithm;
        this.recipientInfos = recipientInfos;
        this.encapsulatedContentInfo = encapsulatedContent;
        this.authAttrs = authAttrs;
        this.mac = mac;
        this.unauthAttrs = unauthAttrs;
    }

    private AuthenticatedData(
        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);
        macAlgorithm = AlgorithmIdentifier.getInstance(seq.getObjectAt(index++));

        tmp = seq.getObjectAt(index++);

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

        encapsulatedContentInfo = ContentInfo.getInstance(tmp);

        tmp = seq.getObjectAt(index++);

        if (tmp instanceof ASN1TaggedObject)
        {
            authAttrs = ASN1Set.getInstance((ASN1TaggedObject)tmp, false);
            tmp = seq.getObjectAt(index++);
        }

        mac = ASN1OctetString.getInstance(tmp);
        
        if (seq.size() > index)
        {
            unauthAttrs = ASN1Set.getInstance((ASN1TaggedObject)seq.getObjectAt(index), false);
        }
    }

    /**
     * Return an AuthenticatedData 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.
     * @return a reference that can be assigned to AuthenticatedData (may be null)
     * @throws IllegalArgumentException if the object held by the
     *                                  tagged object cannot be converted.
     */
    public static AuthenticatedData getInstance(
        ASN1TaggedObject obj,
        boolean explicit)
    {
        return getInstance(ASN1Sequence.getInstance(obj, explicit));
    }

    /**
     * Return an AuthenticatedData object from the given object.
     *

* Accepted inputs: * * null → null * {@link AuthenticatedData} object * {@link org.bouncycastle.asn1.ASN1Sequence#getInstance(java.lang.Object) ASN1Sequence} input formats with AuthenticatedData structure inside * * * @param obj the object we want converted. * @return a reference that can be assigned to AuthenticatedData (may be null) * @throws IllegalArgumentException if the object cannot be converted. */ public static AuthenticatedData getInstance( Object obj) { if (obj instanceof AuthenticatedData) { return (AuthenticatedData)obj; } else if (obj != null) { return new AuthenticatedData(ASN1Sequence.getInstance(obj)); } return null; } public ASN1Integer getVersion() { return version; } public OriginatorInfo getOriginatorInfo() { return originatorInfo; } public ASN1Set getRecipientInfos() { return recipientInfos; } public AlgorithmIdentifier getMacAlgorithm() { return macAlgorithm; } public AlgorithmIdentifier getDigestAlgorithm() { return digestAlgorithm; } public ContentInfo getEncapsulatedContentInfo() { return encapsulatedContentInfo; } public ASN1Set getAuthAttrs() { return authAttrs; } public ASN1OctetString getMac() { return mac; } public ASN1Set getUnauthAttrs() { return unauthAttrs; } /** * Produce an object suitable for an ASN1OutputStream. */ public ASN1Primitive toASN1Primitive() { ASN1EncodableVector v = new ASN1EncodableVector(); v.add(version); if (originatorInfo != null) { v.add(new DERTaggedObject(false, 0, originatorInfo)); } v.add(recipientInfos); v.add(macAlgorithm); if (digestAlgorithm != null) { v.add(new DERTaggedObject(false, 1, digestAlgorithm)); } v.add(encapsulatedContentInfo); if (authAttrs != null) { v.add(new DERTaggedObject(false, 2, authAttrs)); } v.add(mac); if (unauthAttrs != null) { v.add(new DERTaggedObject(false, 3, unauthAttrs)); } return new BERSequence(v); } public static int calculateVersion(OriginatorInfo origInfo) { if (origInfo == null) { return 0; } else { int ver = 0; for (Enumeration e = origInfo.getCertificates().getObjects(); e.hasMoreElements();) { Object obj = e.nextElement(); if (obj instanceof ASN1TaggedObject) { ASN1TaggedObject tag = (ASN1TaggedObject)obj; if (tag.getTagNo() == 2) { ver = 1; } else if (tag.getTagNo() == 3) { ver = 3; break; } } } if (origInfo.getCRLs() != null) { for (Enumeration e = origInfo.getCRLs().getObjects(); e.hasMoreElements();) { Object obj = e.nextElement(); if (obj instanceof ASN1TaggedObject) { ASN1TaggedObject tag = (ASN1TaggedObject)obj; if (tag.getTagNo() == 1) { ver = 3; break; } } } } return ver; } } }