org.bouncycastle.cms.bc.BcPasswordRecipientInfoGenerator 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 and up. 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.bc;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.pkcs.PBKDF2Params;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.cms.CMSException;
import org.bouncycastle.cms.PasswordRecipient;
import org.bouncycastle.cms.PasswordRecipientInfoGenerator;
import org.bouncycastle.crypto.PBEParametersGenerator;
import org.bouncycastle.crypto.Wrapper;
import org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator;
import org.bouncycastle.crypto.params.KeyParameter;
import org.bouncycastle.crypto.params.ParametersWithIV;
import org.bouncycastle.operator.GenericKey;

public class BcPasswordRecipientInfoGenerator
    extends PasswordRecipientInfoGenerator
{
    public BcPasswordRecipientInfoGenerator(ASN1ObjectIdentifier kekAlgorithm, char[] password)
    {
        super(kekAlgorithm, password);
    }

    protected byte[] calculateDerivedKey(int schemeID, AlgorithmIdentifier derivationAlgorithm, int keySize)
        throws CMSException
    {
        PBKDF2Params params = PBKDF2Params.getInstance(derivationAlgorithm.getParameters());
        byte[] encodedPassword = (schemeID == PasswordRecipient.PKCS5_SCHEME2) ? PBEParametersGenerator.PKCS5PasswordToBytes(password) : PBEParametersGenerator.PKCS5PasswordToUTF8Bytes(password);

        try
        {
            PKCS5S2ParametersGenerator gen = new PKCS5S2ParametersGenerator(EnvelopedDataHelper.getPRF(params.getPrf()));

            gen.init(encodedPassword, params.getSalt(), params.getIterationCount().intValue());

            return ((KeyParameter)gen.generateDerivedParameters(keySize)).getKey();
        }
        catch (Exception e)
        {
            throw new CMSException("exception creating derived key: " + e.getMessage(), e);
        }
    }

    public byte[] generateEncryptedBytes(AlgorithmIdentifier keyEncryptionAlgorithm, byte[] derivedKey, GenericKey contentEncryptionKey)
        throws CMSException
    {
        byte[] contentEncryptionKeySpec = ((KeyParameter)CMSUtils.getBcKey(contentEncryptionKey)).getKey();
        Wrapper keyEncryptionCipher = EnvelopedDataHelper.createRFC3211Wrapper(keyEncryptionAlgorithm.getAlgorithm());

        keyEncryptionCipher.init(true, new ParametersWithIV(new KeyParameter(derivedKey), ASN1OctetString.getInstance(keyEncryptionAlgorithm.getParameters()).getOctets()));

        return keyEncryptionCipher.wrap(contentEncryptionKeySpec, 0, contentEncryptionKeySpec.length);
    }
}