org.bouncycastle.openssl.jcajce.JcePEMEncryptorBuilder Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of bcpkix-jdk14 Show documentation

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.

There is a newer version: 1.79

Show newest version

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);
            }
        };
    }
}