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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.cert.crmf.bc;

import java.security.SecureRandom;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.cert.crmf.CRMFException;
import org.bouncycastle.crypto.CipherKeyGenerator;
import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.params.KeyParameter;
import org.bouncycastle.crypto.util.AlgorithmIdentifierFactory;
import org.bouncycastle.crypto.util.CipherFactory;
import org.bouncycastle.crypto.util.CipherKeyGeneratorFactory;

class CRMFHelper
{
    CRMFHelper()
    {
    }

    CipherKeyGenerator createKeyGenerator(ASN1ObjectIdentifier algorithm, SecureRandom random)
        throws CRMFException
    {
        try
        {
            return CipherKeyGeneratorFactory.createKeyGenerator(algorithm, random);
        }
        catch (IllegalArgumentException e)
        {
            throw new CRMFException(e.getMessage(), e);
        }
    }

    static Object createContentCipher(boolean forEncryption, CipherParameters encKey, AlgorithmIdentifier encryptionAlgID)
        throws CRMFException
    {
        try
        {
            return CipherFactory.createContentCipher(forEncryption, encKey, encryptionAlgID);
        }
        catch (IllegalArgumentException e)
        {
            throw new CRMFException(e.getMessage(), e);
        }
    }

    AlgorithmIdentifier generateEncryptionAlgID(ASN1ObjectIdentifier encryptionOID, KeyParameter encKey, SecureRandom random)
        throws CRMFException
    {
        try
        {
            return AlgorithmIdentifierFactory.generateEncryptionAlgID(encryptionOID, encKey.getKey().length * 8, random);
        }
        catch (IllegalArgumentException e)
        {
            throw new CRMFException(e.getMessage(), e);
        }
    }
}