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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 and up.

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package org.bouncycastle.jcajce.util;

import java.security.AlgorithmParameterGenerator;
import java.security.AlgorithmParameters;
import java.security.InvalidAlgorithmParameterException;
import java.security.KeyFactory;
import java.security.KeyPairGenerator;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.SecureRandom;
import java.security.Signature;
import java.security.cert.CertPathBuilder;
import java.security.cert.CertPathValidator;
import java.security.cert.CertStore;
import java.security.cert.CertStoreParameters;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;

import javax.crypto.Cipher;
import javax.crypto.ExemptionMechanism;
import javax.crypto.KeyAgreement;
import javax.crypto.KeyGenerator;
import javax.crypto.Mac;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKeyFactory;

/**
 * Factory interface for instantiating JCA/JCE primitives.
 */
public interface JcaJceHelper
{
    Cipher createCipher(
        String algorithm)
        throws NoSuchAlgorithmException, NoSuchPaddingException, NoSuchProviderException;

    Mac createMac(String algorithm)
        throws NoSuchAlgorithmException, NoSuchProviderException;

    KeyAgreement createKeyAgreement(String algorithm)
        throws NoSuchAlgorithmException, NoSuchProviderException;

    AlgorithmParameterGenerator createAlgorithmParameterGenerator(String algorithm)
        throws NoSuchAlgorithmException, NoSuchProviderException;

    AlgorithmParameters createAlgorithmParameters(String algorithm)
        throws NoSuchAlgorithmException, NoSuchProviderException;

    KeyGenerator createKeyGenerator(String algorithm)
        throws NoSuchAlgorithmException, NoSuchProviderException;

    KeyFactory createKeyFactory(String algorithm)
        throws NoSuchAlgorithmException, NoSuchProviderException;

    SecretKeyFactory createSecretKeyFactory(String algorithm)
           throws NoSuchAlgorithmException, NoSuchProviderException;

    KeyPairGenerator createKeyPairGenerator(String algorithm)
        throws NoSuchAlgorithmException, NoSuchProviderException;

    /** @deprecated Use createMessageDigest instead */
    MessageDigest createDigest(String algorithm)
        throws NoSuchAlgorithmException, NoSuchProviderException;

    MessageDigest createMessageDigest(String algorithm)
        throws NoSuchAlgorithmException, NoSuchProviderException;

    Signature createSignature(String algorithm)
        throws NoSuchAlgorithmException, NoSuchProviderException;

    CertificateFactory createCertificateFactory(String algorithm)
        throws NoSuchProviderException, CertificateException;

    SecureRandom createSecureRandom(String algorithm)
        throws NoSuchAlgorithmException, NoSuchProviderException;

    CertPathBuilder createCertPathBuilder(String algorithm)
        throws NoSuchAlgorithmException, NoSuchProviderException;

    CertPathValidator createCertPathValidator(String algorithm)
        throws NoSuchAlgorithmException, NoSuchProviderException;

    CertStore createCertStore(String type, CertStoreParameters params)
        throws NoSuchAlgorithmException, InvalidAlgorithmParameterException, NoSuchProviderException;

    ExemptionMechanism createExemptionMechanism(String algorithm)
        throws NoSuchAlgorithmException, NoSuchProviderException;

    KeyStore createKeyStore(String type)
        throws KeyStoreException, NoSuchProviderException;
}