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package org.bouncycastle.its.jcajce;
import java.security.Provider;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import org.bouncycastle.its.operator.ETSIDataEncryptor;
import org.bouncycastle.jcajce.util.DefaultJcaJceHelper;
import org.bouncycastle.jcajce.util.JcaJceHelper;
import org.bouncycastle.jcajce.util.NamedJcaJceHelper;
import org.bouncycastle.jcajce.util.ProviderJcaJceHelper;
public class JceETSIDataEncryptor
implements ETSIDataEncryptor
{
private final SecureRandom random;
private final JcaJceHelper helper;
private byte[] nonce;
private byte[] key;
private JceETSIDataEncryptor(SecureRandom random, JcaJceHelper helper)
{
this.random = random;
this.helper = helper;
}
public byte[] encrypt(byte[] content)
{
key = new byte[16];
random.nextBytes(key);
nonce = new byte[12];
random.nextBytes(nonce);
try
{
SecretKey k = new SecretKeySpec(key, "AES");
Cipher ccm = helper.createCipher("CCM");
ccm.init(Cipher.ENCRYPT_MODE, k, ClassUtil.getGCMSpec(nonce, 128));
return ccm.doFinal(content);
}
catch (Exception ex)
{
throw new RuntimeException(ex.getMessage(), ex);
}
}
public byte[] getKey()
{
return key;
}
public byte[] getNonce()
{
return nonce;
}
public static class Builder
{
private SecureRandom random;
private JcaJceHelper helper = new DefaultJcaJceHelper();
public Builder()
{
}
public Builder setRandom(SecureRandom random)
{
this.random = random;
return this;
}
/**
* Sets the JCE provider to source cryptographic primitives from.
*
* @param provider the JCE provider to use.
* @return the current builder.
*/
public Builder setProvider(Provider provider)
{
this.helper = new ProviderJcaJceHelper(provider);
return this;
}
/**
* Sets the JCE provider to source cryptographic primitives from.
*
* @param providerName the name of the JCE provider to use.
* @return the current builder.
*/
public Builder setProvider(String providerName)
{
this.helper = new NamedJcaJceHelper(providerName);
return this;
}
public JceETSIDataEncryptor build()
{
if (random == null)
{
random = new SecureRandom();
}
return new JceETSIDataEncryptor(random, helper);
}
}
}
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