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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;

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

import org.bouncycastle.asn1.pkcs.EncryptedPrivateKeyInfo;
import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
import org.bouncycastle.operator.OutputEncryptor;

/**
 * A class for creating EncryptedPrivateKeyInfo structures.
 *  * EncryptedPrivateKeyInfo ::= SEQUENCE {
 *      encryptionAlgorithm AlgorithmIdentifier {{KeyEncryptionAlgorithms}},
 *      encryptedData EncryptedData
 * }
 *
 * EncryptedData ::= OCTET STRING
 *
 * KeyEncryptionAlgorithms ALGORITHM-IDENTIFIER ::= {
 *          ... -- For local profiles
 * }
 * 
 */
public class PKCS8EncryptedPrivateKeyInfoBuilder
{
    private PrivateKeyInfo privateKeyInfo;

    public PKCS8EncryptedPrivateKeyInfoBuilder(byte[] privateKeyInfo)
    {
        this(PrivateKeyInfo.getInstance(privateKeyInfo));
    }

    public PKCS8EncryptedPrivateKeyInfoBuilder(PrivateKeyInfo privateKeyInfo)
    {
        this.privateKeyInfo = privateKeyInfo;
    }

    public PKCS8EncryptedPrivateKeyInfo build(
        OutputEncryptor encryptor)
    {
        try
        {
            ByteArrayOutputStream bOut = new ByteArrayOutputStream();
            OutputStream cOut = encryptor.getOutputStream(bOut);

            cOut.write(privateKeyInfo.getEncoded());

            cOut.close();

            return new PKCS8EncryptedPrivateKeyInfo(new EncryptedPrivateKeyInfo(encryptor.getAlgorithmIdentifier(), bOut.toByteArray()));
        }
        catch (IOException e)
        {
            throw new IllegalStateException("cannot encode privateKeyInfo");
        }
    }
}