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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.cert.crmf.jcajce;

import java.io.OutputStream;
import java.security.AlgorithmParameters;
import java.security.GeneralSecurityException;
import java.security.Provider;
import java.security.SecureRandom;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.cert.crmf.CRMFException;
import org.bouncycastle.jcajce.io.CipherOutputStream;
import org.bouncycastle.jcajce.util.DefaultJcaJceHelper;
import org.bouncycastle.jcajce.util.NamedJcaJceHelper;
import org.bouncycastle.jcajce.util.ProviderJcaJceHelper;
import org.bouncycastle.operator.DefaultSecretKeySizeProvider;
import org.bouncycastle.operator.GenericKey;
import org.bouncycastle.operator.OutputEncryptor;
import org.bouncycastle.operator.SecretKeySizeProvider;
import org.bouncycastle.operator.jcajce.JceGenericKey;

public class JceCRMFEncryptorBuilder
{
    private static final SecretKeySizeProvider KEY_SIZE_PROVIDER = DefaultSecretKeySizeProvider.INSTANCE;

    private final ASN1ObjectIdentifier encryptionOID;
    private final int                  keySize;

    private CRMFHelper helper = new CRMFHelper(new DefaultJcaJceHelper());
    private SecureRandom random;

    public JceCRMFEncryptorBuilder(ASN1ObjectIdentifier encryptionOID)
    {
        this(encryptionOID, -1);
    }

    public JceCRMFEncryptorBuilder(ASN1ObjectIdentifier encryptionOID, int keySize)
    {
        this.encryptionOID = encryptionOID;
        this.keySize = keySize;
    }

    public JceCRMFEncryptorBuilder setProvider(Provider provider)
    {
        this.helper = new CRMFHelper(new ProviderJcaJceHelper(provider));

        return this;
    }

    public JceCRMFEncryptorBuilder setProvider(String providerName)
    {
        this.helper = new CRMFHelper(new NamedJcaJceHelper(providerName));

        return this;
    }

    public JceCRMFEncryptorBuilder setSecureRandom(SecureRandom random)
    {
        this.random = random;

        return this;
    }

    public OutputEncryptor build()
        throws CRMFException
    {
        return new CRMFOutputEncryptor(encryptionOID, keySize, random);
    }

    private class CRMFOutputEncryptor
        implements OutputEncryptor
    {
        private SecretKey encKey;
        private AlgorithmIdentifier algorithmIdentifier;
        private Cipher cipher;

        CRMFOutputEncryptor(ASN1ObjectIdentifier encryptionOID, int keySize, SecureRandom random)
            throws CRMFException
        {
            KeyGenerator keyGen = helper.createKeyGenerator(encryptionOID);

            if (random == null)
            {
                random = new SecureRandom();
            }

            if (keySize < 0)
            {
                keySize = KEY_SIZE_PROVIDER.getKeySize(encryptionOID);
            }

            if (keySize < 0)
            {
                keyGen.init(random);
            }
            else
            {
                keyGen.init(keySize, random);
            }

            cipher = helper.createCipher(encryptionOID);
            encKey = keyGen.generateKey();
            AlgorithmParameters params = helper.generateParameters(encryptionOID, encKey, random);

            try
            {
                cipher.init(Cipher.ENCRYPT_MODE, encKey, params, random);
            }
            catch (GeneralSecurityException e)
            {
                throw new CRMFException("unable to initialize cipher: " + e.getMessage(), e);
            }

            //
            // If params are null we try and second guess on them as some providers don't provide
            // algorithm parameter generation explicity but instead generate them under the hood.
            //
            if (params == null)
            {
                params = cipher.getParameters();
            }

            algorithmIdentifier = helper.getAlgorithmIdentifier(encryptionOID, params);
        }

        public AlgorithmIdentifier getAlgorithmIdentifier()
        {
            return algorithmIdentifier;
        }

        public OutputStream getOutputStream(OutputStream dOut)
        {
            return new CipherOutputStream(dOut, cipher);
        }

        public GenericKey getKey()
        {
            return new JceGenericKey(algorithmIdentifier, encKey);
        }
    }
}