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. The APIs are designed primarily to be used in conjunction with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified.

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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;
    }

    protected byte[] calculateDerivedKey(int schemeID, AlgorithmIdentifier derivationAlgorithm, int keySize)
        throws CMSException
    {
        return helper.calculateDerivedKey(schemeID, password, derivationAlgorithm, keySize);
    }

    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);
        }
    }
}