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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 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.openssl;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.DERNull;
import org.bouncycastle.asn1.cryptopro.CryptoProObjectIdentifiers;
import org.bouncycastle.asn1.nist.NISTObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.EncryptedPrivateKeyInfo;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.operator.OutputEncryptor;
import org.bouncycastle.util.io.pem.PemGenerationException;
import org.bouncycastle.util.io.pem.PemObject;
import org.bouncycastle.util.io.pem.PemObjectGenerator;

public class PKCS8Generator
    implements PemObjectGenerator
{
    public static final ASN1ObjectIdentifier AES_128_CBC = NISTObjectIdentifiers.id_aes128_CBC;
    public static final ASN1ObjectIdentifier AES_192_CBC = NISTObjectIdentifiers.id_aes192_CBC;
    public static final ASN1ObjectIdentifier AES_256_CBC = NISTObjectIdentifiers.id_aes256_CBC;

    public static final ASN1ObjectIdentifier DES3_CBC = PKCSObjectIdentifiers.des_EDE3_CBC;

    public static final ASN1ObjectIdentifier PBE_SHA1_RC4_128 = PKCSObjectIdentifiers.pbeWithSHAAnd128BitRC4;
    public static final ASN1ObjectIdentifier PBE_SHA1_RC4_40 = PKCSObjectIdentifiers.pbeWithSHAAnd40BitRC4;
    public static final ASN1ObjectIdentifier PBE_SHA1_3DES = PKCSObjectIdentifiers.pbeWithSHAAnd3_KeyTripleDES_CBC;
    public static final ASN1ObjectIdentifier PBE_SHA1_2DES = PKCSObjectIdentifiers.pbeWithSHAAnd2_KeyTripleDES_CBC;
    public static final ASN1ObjectIdentifier PBE_SHA1_RC2_128 = PKCSObjectIdentifiers.pbeWithSHAAnd128BitRC2_CBC;
    public static final ASN1ObjectIdentifier PBE_SHA1_RC2_40 = PKCSObjectIdentifiers.pbeWithSHAAnd40BitRC2_CBC;

    public static final AlgorithmIdentifier PRF_HMACSHA1 = new AlgorithmIdentifier(PKCSObjectIdentifiers.id_hmacWithSHA1, DERNull.INSTANCE);
    public static final AlgorithmIdentifier PRF_HMACSHA224 = new AlgorithmIdentifier(PKCSObjectIdentifiers.id_hmacWithSHA224, DERNull.INSTANCE);
    public static final AlgorithmIdentifier PRF_HMACSHA256 = new AlgorithmIdentifier(PKCSObjectIdentifiers.id_hmacWithSHA256, DERNull.INSTANCE);
    public static final AlgorithmIdentifier PRF_HMACSHA384 = new AlgorithmIdentifier(PKCSObjectIdentifiers.id_hmacWithSHA384, DERNull.INSTANCE);
    public static final AlgorithmIdentifier PRF_HMACSHA512 = new AlgorithmIdentifier(PKCSObjectIdentifiers.id_hmacWithSHA512, DERNull.INSTANCE);
    public static final AlgorithmIdentifier PRF_HMACGOST3411 = new AlgorithmIdentifier(CryptoProObjectIdentifiers.gostR3411Hmac, DERNull.INSTANCE);

    public static final AlgorithmIdentifier PRF_HMACSHA3_224 = new AlgorithmIdentifier(NISTObjectIdentifiers.id_hmacWithSHA3_224, DERNull.INSTANCE);
    public static final AlgorithmIdentifier PRF_HMACSHA3_256 = new AlgorithmIdentifier(NISTObjectIdentifiers.id_hmacWithSHA3_256, DERNull.INSTANCE);
    public static final AlgorithmIdentifier PRF_HMACSHA3_384 = new AlgorithmIdentifier(NISTObjectIdentifiers.id_hmacWithSHA3_384, DERNull.INSTANCE);
    public static final AlgorithmIdentifier PRF_HMACSHA3_512 = new AlgorithmIdentifier(NISTObjectIdentifiers.id_hmacWithSHA3_512, DERNull.INSTANCE);

    private PrivateKeyInfo key;
    private OutputEncryptor outputEncryptor;

    /**
     * Base constructor.
     */
    public PKCS8Generator(PrivateKeyInfo key, OutputEncryptor outputEncryptor)
    {
        this.key = key;
        this.outputEncryptor = outputEncryptor;
    }

    public PemObject generate()
        throws PemGenerationException
    {
        if (outputEncryptor != null)
        {
            return generate(key, outputEncryptor);
        }
        else
        {
            return generate(key, null);
        }
    }

    private PemObject generate(PrivateKeyInfo key, OutputEncryptor encryptor)
        throws PemGenerationException
    {
        try
        {
            byte[] keyData = key.getEncoded();

            if (encryptor == null)
            {
                return new PemObject("PRIVATE KEY", keyData);
            }

            ByteArrayOutputStream bOut = new ByteArrayOutputStream();

            OutputStream cOut = encryptor.getOutputStream(bOut);

            cOut.write(key.getEncoded());

            cOut.close();

            EncryptedPrivateKeyInfo info = new EncryptedPrivateKeyInfo(encryptor.getAlgorithmIdentifier(), bOut.toByteArray());

            return new PemObject("ENCRYPTED PRIVATE KEY", info.getEncoded());
        }
        catch (IOException e)
        {
            throw new PemGenerationException("unable to process encoded key data: " + e.getMessage(), e);
        }
    }
}