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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.

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package org.spongycastle.jcajce.util;

import java.security.AlgorithmParameterGenerator;
import java.security.AlgorithmParameters;
import java.security.KeyFactory;
import java.security.KeyPairGenerator;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.SecureRandom;
import java.security.Signature;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;

import javax.crypto.Cipher;
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;

    MessageDigest createDigest(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;
}