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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 1.8 and up. The APIs are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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package org.bouncycastle.openssl.jcajce;

import java.security.Provider;
import java.security.SecureRandom;

import org.bouncycastle.jcajce.util.DefaultJcaJceHelper;
import org.bouncycastle.jcajce.util.JcaJceHelper;
import org.bouncycastle.jcajce.util.NamedJcaJceHelper;
import org.bouncycastle.jcajce.util.ProviderJcaJceHelper;
import org.bouncycastle.openssl.PEMEncryptor;
import org.bouncycastle.openssl.PEMException;

public class JcePEMEncryptorBuilder
{
    private final String algorithm;

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

    public JcePEMEncryptorBuilder(String algorithm)
    {
        this.algorithm = algorithm;
    }

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

        return this;
    }

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

        return this;
    }

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

        return this;
    }

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

        int ivLength = algorithm.startsWith("AES-") ? 16 : 8;

        final byte[] iv = new byte[ivLength];

        random.nextBytes(iv);

        return new PEMEncryptor()
        {
            public String getAlgorithm()
            {
                return algorithm;
            }

            public byte[] getIV()
            {
                return iv;
            }

            public byte[] encrypt(byte[] encoding)
                throws PEMException
            {
                return PEMUtilities.crypt(true, helper, encoding, password, algorithm, iv);
            }
        };
    }
}