org.bouncycastle.cms.jcajce.JcePasswordRecipientInfoGenerator Maven / Gradle / Ivy

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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.cms.jcajce;

import java.security.GeneralSecurityException;
import java.security.Key;
import java.security.Provider;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.cms.CMSException;
import org.bouncycastle.cms.PasswordRecipientInfoGenerator;
import org.bouncycastle.operator.GenericKey;

public class JcePasswordRecipientInfoGenerator
    extends PasswordRecipientInfoGenerator
{
    private EnvelopedDataHelper helper = new EnvelopedDataHelper(new DefaultJcaJceExtHelper());

    public JcePasswordRecipientInfoGenerator(ASN1ObjectIdentifier kekAlgorithm, char[] password)
    {
        super(kekAlgorithm, password);
    }

    public JcePasswordRecipientInfoGenerator setProvider(Provider provider)
    {
        this.helper = new EnvelopedDataHelper(new ProviderJcaJceExtHelper(provider));

        return this;
    }

    public JcePasswordRecipientInfoGenerator setProvider(String providerName)
    {
        this.helper = new EnvelopedDataHelper(new NamedJcaJceExtHelper(providerName));

        return this;
    }

    public byte[] generateEncryptedBytes(AlgorithmIdentifier keyEncryptionAlgorithm, byte[] derivedKey, GenericKey contentEncryptionKey)
        throws CMSException
    {
        Key contentEncryptionKeySpec = helper.getJceKey(contentEncryptionKey);
        Cipher keyEncryptionCipher = helper.createRFC3211Wrapper(keyEncryptionAlgorithm.getAlgorithm());

        try
        {
            IvParameterSpec ivSpec = new IvParameterSpec(ASN1OctetString.getInstance(keyEncryptionAlgorithm.getParameters()).getOctets());

            keyEncryptionCipher.init(Cipher.WRAP_MODE, new SecretKeySpec(derivedKey, keyEncryptionCipher.getAlgorithm()), ivSpec);

            return keyEncryptionCipher.wrap(contentEncryptionKeySpec);
        }
        catch (GeneralSecurityException e)
        {
            throw new CMSException("cannot process content encryption key: " + e.getMessage(), e);
        }
    }
}