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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.ASN1OctetString;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.cms.CMSException;
import org.bouncycastle.cms.PasswordRecipient;

/**
 * the RecipientInfo class for a recipient who has been sent a message
 * encrypted using a password.
 */
public abstract class JcePasswordRecipient
    implements PasswordRecipient
{
    private int schemeID = PasswordRecipient.PKCS5_SCHEME2_UTF8;
    protected EnvelopedDataHelper helper = new EnvelopedDataHelper(new DefaultJcaJceExtHelper());
    private char[] password;

    JcePasswordRecipient(
        char[] password)
    {
        this.password = password;
    }

    public JcePasswordRecipient setPasswordConversionScheme(int schemeID)
    {
        this.schemeID = schemeID;

        return this;
    }

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

        return this;
    }

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

        return this;
    }

    protected Key extractSecretKey(AlgorithmIdentifier keyEncryptionAlgorithm, AlgorithmIdentifier contentEncryptionAlgorithm, byte[] derivedKey, byte[] encryptedContentEncryptionKey)
        throws CMSException
    {
        Cipher keyEncryptionCipher = helper.createRFC3211Wrapper(keyEncryptionAlgorithm.getAlgorithm());

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

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

            return keyEncryptionCipher.unwrap(encryptedContentEncryptionKey, contentEncryptionAlgorithm.getAlgorithm().getId(), Cipher.SECRET_KEY);
        }
        catch (GeneralSecurityException e)
        {
            throw new CMSException("cannot process content encryption key: " + e.getMessage(), e);
        }
    }

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

    public int getPasswordConversionScheme()
    {
        return schemeID;
    }

    public char[] getPassword()
    {
        return password;
    }
}