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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 to JDK 1.8. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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package org.bouncycastle.cms;

import java.io.IOException;
import java.io.InputStream;

import org.bouncycastle.asn1.ASN1Set;
import org.bouncycastle.asn1.cms.AuthEnvelopedData;
import org.bouncycastle.asn1.cms.ContentInfo;
import org.bouncycastle.asn1.cms.EncryptedContentInfo;
import org.bouncycastle.asn1.cms.OriginatorInfo;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;

/**
 * containing class for an CMS AuthEnveloped Data object
 */
class CMSAuthEnvelopedData
{
    RecipientInformationStore recipientInfoStore;
    ContentInfo contentInfo;

    private OriginatorInfo      originator;
    private AlgorithmIdentifier authEncAlg;
    private ASN1Set             authAttrs;
    private byte[]              mac;
    private ASN1Set             unauthAttrs;

    public CMSAuthEnvelopedData(byte[] authEnvData) throws CMSException
    {
        this(CMSUtils.readContentInfo(authEnvData));
    }

    public CMSAuthEnvelopedData(InputStream authEnvData) throws CMSException
    {
        this(CMSUtils.readContentInfo(authEnvData));
    }

    public CMSAuthEnvelopedData(ContentInfo contentInfo) throws CMSException
    {
        this.contentInfo = contentInfo;

        AuthEnvelopedData authEnvData = AuthEnvelopedData.getInstance(contentInfo.getContent());

        this.originator = authEnvData.getOriginatorInfo();

        //
        // read the recipients
        //
        ASN1Set recipientInfos = authEnvData.getRecipientInfos();

        //
        // read the auth-encrypted content info
        //
        EncryptedContentInfo authEncInfo = authEnvData.getAuthEncryptedContentInfo();
        this.authEncAlg = authEncInfo.getContentEncryptionAlgorithm();
//        final CMSProcessable processable = new CMSProcessableByteArray(
//            authEncInfo.getEncryptedContent().getOctets());
        CMSSecureReadable secureReadable = new CMSSecureReadable()
        {

            public InputStream getInputStream()
                throws IOException, CMSException
            {
                return null;
            }
        };

        //
        // build the RecipientInformationStore
        //
        this.recipientInfoStore = CMSEnvelopedHelper.buildRecipientInformationStore(
            recipientInfos, this.authEncAlg, secureReadable);

        // FIXME These need to be passed to the AEAD cipher as AAD (Additional Authenticated Data)
        this.authAttrs = authEnvData.getAuthAttrs();
        this.mac = authEnvData.getMac().getOctets();
        this.unauthAttrs = authEnvData.getUnauthAttrs();
    }
}