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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 1.4. 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.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1Set;
import org.bouncycastle.asn1.cms.KEKRecipientInfo;
import org.bouncycastle.asn1.cms.KeyAgreeRecipientInfo;
import org.bouncycastle.asn1.cms.KeyTransRecipientInfo;
import org.bouncycastle.asn1.cms.PasswordRecipientInfo;
import org.bouncycastle.asn1.cms.RecipientInfo;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.operator.DigestCalculator;

class CMSEnvelopedHelper
{
    static RecipientInformationStore buildRecipientInformationStore(
        ASN1Set recipientInfos, AlgorithmIdentifier messageAlgorithm, CMSSecureReadable secureReadable)
    {
        return buildRecipientInformationStore(recipientInfos, messageAlgorithm, secureReadable, null);
    }

    static RecipientInformationStore buildRecipientInformationStore(
        ASN1Set recipientInfos, AlgorithmIdentifier messageAlgorithm, CMSSecureReadable secureReadable, AuthAttributesProvider additionalData)
    {
        List infos = new ArrayList();
        for (int i = 0; i != recipientInfos.size(); i++)
        {
            RecipientInfo info = RecipientInfo.getInstance(recipientInfos.getObjectAt(i));

            readRecipientInfo(infos, info, messageAlgorithm, secureReadable, additionalData);
        }
        return new RecipientInformationStore(infos);
    }

    private static void readRecipientInfo(
        List infos, RecipientInfo info, AlgorithmIdentifier messageAlgorithm, CMSSecureReadable secureReadable, AuthAttributesProvider additionalData)
    {
        ASN1Encodable recipInfo = info.getInfo();
        if (recipInfo instanceof KeyTransRecipientInfo)
        {
            infos.add(new KeyTransRecipientInformation(
                (KeyTransRecipientInfo)recipInfo, messageAlgorithm, secureReadable, additionalData));
        }
        else if (recipInfo instanceof KEKRecipientInfo)
        {
            infos.add(new KEKRecipientInformation(
                (KEKRecipientInfo)recipInfo, messageAlgorithm, secureReadable, additionalData));
        }
        else if (recipInfo instanceof KeyAgreeRecipientInfo)
        {
            KeyAgreeRecipientInformation.readRecipientInfo(infos,
                (KeyAgreeRecipientInfo)recipInfo, messageAlgorithm, secureReadable, additionalData);
        }
        else if (recipInfo instanceof PasswordRecipientInfo)
        {
            infos.add(new PasswordRecipientInformation(
                (PasswordRecipientInfo)recipInfo, messageAlgorithm, secureReadable, additionalData));
        }
    }

    static class CMSDigestAuthenticatedSecureReadable
        implements CMSSecureReadable
    {
        private DigestCalculator digestCalculator;
        private final ASN1ObjectIdentifier contentType;
        private CMSReadable readable;

        public CMSDigestAuthenticatedSecureReadable(DigestCalculator digestCalculator, ASN1ObjectIdentifier contentType, CMSReadable readable)
        {
            this.digestCalculator = digestCalculator;
            this.contentType = contentType;
            this.readable = readable;
        }

        public ASN1ObjectIdentifier getContentType()
        {
            return contentType;
        }

        public InputStream getInputStream()
            throws IOException, CMSException
        {
            return new FilterInputStream(readable.getInputStream())
            {
                public int read()
                    throws IOException
                {
                    int b = in.read();

                    if (b >= 0)
                    {
                        digestCalculator.getOutputStream().write(b);
                    }

                    return b;
                }

                public int read(byte[] inBuf, int inOff, int inLen)
                    throws IOException
                {
                    int n = in.read(inBuf, inOff, inLen);
                    
                    if (n >= 0)
                    {
                        digestCalculator.getOutputStream().write(inBuf, inOff, n);
                    }

                    return n;
                }
            };
        }

        public byte[] getDigest()
        {
            return digestCalculator.getDigest();
        }
    }

    static class CMSAuthenticatedSecureReadable implements CMSSecureReadable
    {
        private AlgorithmIdentifier algorithm;
        private final ASN1ObjectIdentifier contentType;
        private CMSReadable readable;

        CMSAuthenticatedSecureReadable(AlgorithmIdentifier algorithm, ASN1ObjectIdentifier contentType, CMSReadable readable)
        {
            this.algorithm = algorithm;
            this.contentType = contentType;
            this.readable = readable;
        }

        public ASN1ObjectIdentifier getContentType()
        {
            return contentType;
        }

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

    }

    static class CMSEnvelopedSecureReadable implements CMSSecureReadable
    {
        private AlgorithmIdentifier algorithm;
        private final ASN1ObjectIdentifier contentType;
        private CMSReadable readable;

        CMSEnvelopedSecureReadable(AlgorithmIdentifier algorithm, ASN1ObjectIdentifier contentType, CMSReadable readable)
        {
            this.algorithm = algorithm;
            this.contentType = contentType;
            this.readable = readable;
        }

        public ASN1ObjectIdentifier getContentType()
        {
            return contentType;
        }

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

    }
}