org.bouncycastle.openssl.jcajce.JcePEMEncryptorBuilder Maven / Gradle / Ivy
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);
}
};
}
}