org.bouncycastle.asn1.cms.AuthEnvelopedDataParser Maven / Gradle / Ivy

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The Bouncy Castle Java APIs for ASN.1 extension and utility APIs used to support bcpkix and bctls with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified and used appropriately.

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/***************************************************************/
/******    DO NOT EDIT THIS CLASS bc-java SOURCE FILE     ******/
/***************************************************************/
package org.bouncycastle.asn1.cms;

import java.io.IOException;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1ParsingException;
import org.bouncycastle.asn1.ASN1SequenceParser;
import org.bouncycastle.asn1.ASN1SetParser;
import org.bouncycastle.asn1.ASN1TaggedObjectParser;
import org.bouncycastle.asn1.BERTags;

/**
 * Parse {@link AuthEnvelopedData} input stream.
 * 
 *  * AuthEnvelopedData ::= SEQUENCE {
 *   version CMSVersion,
 *   originatorInfo [0] IMPLICIT OriginatorInfo OPTIONAL,
 *   recipientInfos RecipientInfos,
 *   authEncryptedContentInfo EncryptedContentInfo,
 *   authAttrs [1] IMPLICIT AuthAttributes OPTIONAL,
 *   mac MessageAuthenticationCode,
 *   unauthAttrs [2] IMPLICIT UnauthAttributes OPTIONAL }
 * 
 */
public class AuthEnvelopedDataParser
{
    private ASN1SequenceParser seq;
    private ASN1Integer version;
    private ASN1Encodable nextObject;
    private boolean originatorInfoCalled;
    private EncryptedContentInfoParser authEncryptedContentInfoParser;

    public AuthEnvelopedDataParser(ASN1SequenceParser seq) throws IOException
    {
        this.seq = seq;

        // "It MUST be set to 0."
        this.version = ASN1Integer.getInstance(seq.readObject());
        if (this.version.getValue().intValue() != 0)
        {
            throw new ASN1ParsingException("AuthEnvelopedData version number must be 0");
        }
    }

    public ASN1Integer getVersion()
    {
        return version;
    }

    public OriginatorInfo getOriginatorInfo()
        throws IOException
    {
        originatorInfoCalled = true;

        if (nextObject == null)
        {
            nextObject = seq.readObject();
        }

        if (nextObject instanceof ASN1TaggedObjectParser && ((ASN1TaggedObjectParser)nextObject).getTagNo() == 0)
        {
            ASN1SequenceParser originatorInfo = (ASN1SequenceParser) ((ASN1TaggedObjectParser)nextObject).getObjectParser(BERTags.SEQUENCE, false);
            nextObject = null;
            return OriginatorInfo.getInstance(originatorInfo.toASN1Primitive());
        }

        return null;
    }

    public ASN1SetParser getRecipientInfos()
        throws IOException
    {
        if (!originatorInfoCalled)
        {
            getOriginatorInfo();
        }

        if (nextObject == null)
        {
            nextObject = seq.readObject();
        }

        ASN1SetParser recipientInfos = (ASN1SetParser)nextObject;
        nextObject = null;
        return recipientInfos;
    }

    public EncryptedContentInfoParser getAuthEncryptedContentInfo()
        throws IOException
    {
        if (nextObject == null)
        {
            nextObject = seq.readObject();
        }

        if (nextObject != null)
        {
            ASN1SequenceParser o = (ASN1SequenceParser) nextObject;
            nextObject = null;
            authEncryptedContentInfoParser = new EncryptedContentInfoParser(o);
            return authEncryptedContentInfoParser;
        }

        return null;
    }

    public ASN1SetParser getAuthAttrs()
        throws IOException
    {
        if (nextObject == null)
        {
            nextObject = seq.readObject();
        }

        if (nextObject instanceof ASN1TaggedObjectParser)
        {
            ASN1Encodable o = nextObject;
            nextObject = null;
            return (ASN1SetParser)((ASN1TaggedObjectParser)o).getObjectParser(BERTags.SET, false);
        }

        // "The authAttrs MUST be present if the content type carried in
        // EncryptedContentInfo is not id-data."
        if (!authEncryptedContentInfoParser.getContentType().equals(CMSObjectIdentifiers.data))
        {
            throw new ASN1ParsingException("authAttrs must be present with non-data content");
        }

        return null;
    }

    public ASN1OctetString getMac()
        throws IOException
    {
        if (nextObject == null)
        {
            nextObject = seq.readObject();
        }

        ASN1Encodable o = nextObject;
        nextObject = null;

        return ASN1OctetString.getInstance(o.toASN1Primitive());
    }

    public ASN1SetParser getUnauthAttrs()
        throws IOException
    {
        if (nextObject == null)
        {
            nextObject = seq.readObject();
        }

        if (nextObject != null)
        {
            ASN1Encodable o = nextObject;
            nextObject = null;
            return (ASN1SetParser)((ASN1TaggedObjectParser)o).getObjectParser(BERTags.SET, false);
        }

        return null;
    }
}