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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.Provider;
import java.security.PublicKey;
import java.security.cert.CertificateEncodingException;
import java.security.cert.X509Certificate;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.cms.IssuerAndSerialNumber;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.cert.jcajce.JcaX509CertificateHolder;
import org.bouncycastle.cms.KeyTransRecipientInfoGenerator;
import org.bouncycastle.operator.jcajce.JceAsymmetricKeyWrapper;

public class JceKeyTransRecipientInfoGenerator
    extends KeyTransRecipientInfoGenerator
{
    public JceKeyTransRecipientInfoGenerator(X509Certificate recipientCert)
        throws CertificateEncodingException
    {
        super(new IssuerAndSerialNumber(new JcaX509CertificateHolder(recipientCert).toASN1Structure()), new JceAsymmetricKeyWrapper(recipientCert));
    }

    public JceKeyTransRecipientInfoGenerator(byte[] subjectKeyIdentifier, PublicKey publicKey)
    {
        super(subjectKeyIdentifier, new JceAsymmetricKeyWrapper(publicKey));
    }

    /**
     * Create a generator overriding the algorithm type implied by the public key in the certificate passed in.
     *
     * @param recipientCert certificate carrying the public key.
     * @param algorithmIdentifier the identifier and parameters for the encryption algorithm to be used.
     */
    public JceKeyTransRecipientInfoGenerator(X509Certificate recipientCert, AlgorithmIdentifier algorithmIdentifier)
        throws CertificateEncodingException
    {
        super(new IssuerAndSerialNumber(new JcaX509CertificateHolder(recipientCert).toASN1Structure()), new JceAsymmetricKeyWrapper(algorithmIdentifier, recipientCert.getPublicKey()));
    }

    /**
     * Create a generator overriding the algorithm type implied by the public key passed in.
     *
     * @param subjectKeyIdentifier  the subject key identifier value to associate with the public key.
     * @param algorithmIdentifier  the identifier and parameters for the encryption algorithm to be used.
     * @param publicKey the public key to use.
     */
    public JceKeyTransRecipientInfoGenerator(byte[] subjectKeyIdentifier, AlgorithmIdentifier algorithmIdentifier, PublicKey publicKey)
    {
        super(subjectKeyIdentifier, new JceAsymmetricKeyWrapper(algorithmIdentifier, publicKey));
    }

    public JceKeyTransRecipientInfoGenerator setProvider(String providerName)
    {
        ((JceAsymmetricKeyWrapper)this.wrapper).setProvider(providerName);

        return this;
    }

    public JceKeyTransRecipientInfoGenerator setProvider(Provider provider)
    {
        ((JceAsymmetricKeyWrapper)this.wrapper).setProvider(provider);

        return this;
    }

    /**
     * Internally algorithm ids are converted into cipher names using a lookup table. For some providers
     * the standard lookup table won't work. Use this method to establish a specific mapping from an
     * algorithm identifier to a specific algorithm.
     * 
     *     For example:
     * 
     *     unwrapper.setAlgorithmMapping(PKCSObjectIdentifiers.rsaEncryption, "RSA");
     * 
     * 
     * @param algorithm  OID of algorithm in recipient.
     * @param algorithmName JCE algorithm name to use.
     * @return the current RecipientInfoGenerator.
     */
    public JceKeyTransRecipientInfoGenerator setAlgorithmMapping(ASN1ObjectIdentifier algorithm, String algorithmName)
    {
        ((JceAsymmetricKeyWrapper)this.wrapper).setAlgorithmMapping(algorithm, algorithmName);

        return this;
    }
}