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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.pkcs.bc;

import java.io.OutputStream;
import java.security.SecureRandom;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.pkcs.PKCS12PBEParams;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.crypto.BlockCipher;
import org.bouncycastle.crypto.BufferedBlockCipher;
import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.ExtendedDigest;
import org.bouncycastle.crypto.digests.SHA1Digest;
import org.bouncycastle.crypto.generators.PKCS12ParametersGenerator;
import org.bouncycastle.crypto.io.CipherOutputStream;
import org.bouncycastle.crypto.paddings.PKCS7Padding;
import org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher;
import org.bouncycastle.operator.GenericKey;
import org.bouncycastle.operator.OutputEncryptor;

public class BcPKCS12PBEOutputEncryptorBuilder
{
    private ExtendedDigest digest;

    private BufferedBlockCipher engine;
    private ASN1ObjectIdentifier algorithm;
    private SecureRandom random;
    private int iterationCount = 1024;

    public BcPKCS12PBEOutputEncryptorBuilder(ASN1ObjectIdentifier algorithm, BlockCipher engine)
    {
        this(algorithm, engine, new SHA1Digest());
    }

    public BcPKCS12PBEOutputEncryptorBuilder(ASN1ObjectIdentifier algorithm, BlockCipher engine, ExtendedDigest pbeDigest)
    {
        this.algorithm = algorithm;
        this.engine = new PaddedBufferedBlockCipher(engine, new PKCS7Padding());
        this.digest = pbeDigest;
    }

    public BcPKCS12PBEOutputEncryptorBuilder setIterationCount(int iterationCount)
    {
        this.iterationCount = iterationCount;
        return this;
    }

    public OutputEncryptor build(final char[] password)
    {
        if (random == null)
        {
            random = new SecureRandom();
        }

        final byte[] salt = new byte[20];

        random.nextBytes(salt);

        final PKCS12PBEParams pbeParams = new PKCS12PBEParams(salt, iterationCount);

        CipherParameters params = PKCS12PBEUtils.createCipherParameters(algorithm, digest, engine.getBlockSize(), pbeParams, password);

        engine.init(true, params);

        return new OutputEncryptor()
        {
            public AlgorithmIdentifier getAlgorithmIdentifier()
            {
                return new AlgorithmIdentifier(algorithm, pbeParams);
            }

            public OutputStream getOutputStream(OutputStream out)
            {
                return new CipherOutputStream(out, engine);
            }

            public GenericKey getKey()
            {
                return new GenericKey(new AlgorithmIdentifier(algorithm, pbeParams), PKCS12ParametersGenerator.PKCS12PasswordToBytes(password));
            }
        };
    }
}