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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 and up. 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.bc;

import java.security.SecureRandom;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.nist.NISTObjectIdentifiers;
import org.bouncycastle.asn1.oiw.OIWObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.cms.CMSAlgorithm;
import org.bouncycastle.cms.CMSException;
import org.bouncycastle.crypto.CipherKeyGenerator;
import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.ExtendedDigest;
import org.bouncycastle.crypto.Wrapper;
import org.bouncycastle.crypto.digests.SHA1Digest;
import org.bouncycastle.crypto.digests.SHA224Digest;
import org.bouncycastle.crypto.digests.SHA256Digest;
import org.bouncycastle.crypto.digests.SHA384Digest;
import org.bouncycastle.crypto.digests.SHA512Digest;
import org.bouncycastle.crypto.engines.AESEngine;
import org.bouncycastle.crypto.engines.DESEngine;
import org.bouncycastle.crypto.engines.DESedeEngine;
import org.bouncycastle.crypto.engines.RC2Engine;
import org.bouncycastle.crypto.engines.RFC3211WrapEngine;
import org.bouncycastle.crypto.params.KeyParameter;
import org.bouncycastle.crypto.util.AlgorithmIdentifierFactory;
import org.bouncycastle.crypto.util.CipherFactory;
import org.bouncycastle.crypto.util.CipherKeyGeneratorFactory;
import org.bouncycastle.operator.OperatorCreationException;
import org.bouncycastle.operator.bc.BcDigestProvider;

class EnvelopedDataHelper
{
    protected static final Map BASE_CIPHER_NAMES = new HashMap();
    protected static final Map MAC_ALG_NAMES = new HashMap();

    private static final Map prfs = createTable();

    private static Map createTable()
    {
        Map table = new HashMap();

        table.put(PKCSObjectIdentifiers.id_hmacWithSHA1, new BcDigestProvider()
        {
            public ExtendedDigest get(AlgorithmIdentifier digestAlgorithmIdentifier)
            {
                return new SHA1Digest();
            }
        });
        table.put(PKCSObjectIdentifiers.id_hmacWithSHA224, new BcDigestProvider()
        {
            public ExtendedDigest get(AlgorithmIdentifier digestAlgorithmIdentifier)
            {
                return new SHA224Digest();
            }
        });
        table.put(PKCSObjectIdentifiers.id_hmacWithSHA256, new BcDigestProvider()
        {
            public ExtendedDigest get(AlgorithmIdentifier digestAlgorithmIdentifier)
            {
                return new SHA256Digest();
            }
        });
        table.put(PKCSObjectIdentifiers.id_hmacWithSHA384, new BcDigestProvider()
        {
            public ExtendedDigest get(AlgorithmIdentifier digestAlgorithmIdentifier)
            {
                return new SHA384Digest();
            }
        });
        table.put(PKCSObjectIdentifiers.id_hmacWithSHA512, new BcDigestProvider()
        {
            public ExtendedDigest get(AlgorithmIdentifier digestAlgorithmIdentifier)
            {
                return new SHA512Digest();
            }
        });

        return Collections.unmodifiableMap(table);
    }

    static
    {
        BASE_CIPHER_NAMES.put(CMSAlgorithm.DES_EDE3_CBC, "DESEDE");
        BASE_CIPHER_NAMES.put(CMSAlgorithm.AES128_CBC, "AES");
        BASE_CIPHER_NAMES.put(CMSAlgorithm.AES192_CBC, "AES");
        BASE_CIPHER_NAMES.put(CMSAlgorithm.AES256_CBC, "AES");

        MAC_ALG_NAMES.put(CMSAlgorithm.DES_EDE3_CBC, "DESEDEMac");
        MAC_ALG_NAMES.put(CMSAlgorithm.AES128_CBC, "AESMac");
        MAC_ALG_NAMES.put(CMSAlgorithm.AES192_CBC, "AESMac");
        MAC_ALG_NAMES.put(CMSAlgorithm.AES256_CBC, "AESMac");
        MAC_ALG_NAMES.put(CMSAlgorithm.RC2_CBC, "RC2Mac");
    }

    EnvelopedDataHelper()
    {
    }

    static ExtendedDigest getPRF(AlgorithmIdentifier algID)
        throws OperatorCreationException
    {
        return ((BcDigestProvider)prfs.get(algID.getAlgorithm())).get(null);
    }

    static Wrapper createRFC3211Wrapper(ASN1ObjectIdentifier algorithm)
        throws CMSException
    {
        if (NISTObjectIdentifiers.id_aes128_CBC.equals(algorithm)
            || NISTObjectIdentifiers.id_aes192_CBC.equals(algorithm)
            || NISTObjectIdentifiers.id_aes256_CBC.equals(algorithm))
        {
            return new RFC3211WrapEngine(new AESEngine());
        }
        else if (PKCSObjectIdentifiers.des_EDE3_CBC.equals(algorithm))
        {
            return new RFC3211WrapEngine(new DESedeEngine());
        }
        else if (OIWObjectIdentifiers.desCBC.equals(algorithm))
        {
            return new RFC3211WrapEngine(new DESEngine());
        }
        else if (PKCSObjectIdentifiers.RC2_CBC.equals(algorithm))
        {
            return new RFC3211WrapEngine(new RC2Engine());
        }
        else
        {
            throw new CMSException("cannot recognise wrapper: " + algorithm);
        }
    }

    static Object createContentCipher(boolean forEncryption, CipherParameters encKey, AlgorithmIdentifier encryptionAlgID)
        throws CMSException
    {
        try
        {
            return CipherFactory.createContentCipher(forEncryption, encKey, encryptionAlgID);
        }
        catch (IllegalArgumentException e)
        {
            throw new CMSException(e.getMessage(), e);
        }
    }

    AlgorithmIdentifier generateEncryptionAlgID(ASN1ObjectIdentifier encryptionOID, KeyParameter encKey, SecureRandom random)
        throws CMSException
    {
        try
        {
            return AlgorithmIdentifierFactory.generateEncryptionAlgID(encryptionOID, encKey.getKey().length * 8, random);
        }
        catch (IllegalArgumentException e)
        {
            throw new CMSException(e.getMessage(), e);
        }
    }

    // TODO: make use of keySize parameter.
    CipherKeyGenerator createKeyGenerator(ASN1ObjectIdentifier algorithm, int keySize, SecureRandom random)
        throws CMSException
    {
        try
        {
            return CipherKeyGeneratorFactory.createKeyGenerator(algorithm, random);
        }
        catch (IllegalArgumentException e)
        {
            throw new CMSException(e.getMessage(), e);
        }
    }

    boolean isAuthEnveloped(ASN1ObjectIdentifier algorithm) {
        return NISTObjectIdentifiers.id_aes128_GCM.equals(algorithm)
                || NISTObjectIdentifiers.id_aes192_GCM.equals(algorithm)
                || NISTObjectIdentifiers.id_aes256_GCM.equals(algorithm);
    }
}