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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 1.8 and up. The APIs are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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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);
        }
    }
}