org.cryptacular.spec.StreamCipherSpec.java Source code

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Here is the source code for org.cryptacular.spec.StreamCipherSpec.java

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/* See LICENSE for licensing and NOTICE for copyright. */
package org.cryptacular.spec;

import org.bouncycastle.crypto.StreamCipher;
import org.bouncycastle.crypto.engines.Grain128Engine;
import org.bouncycastle.crypto.engines.HC128Engine;
import org.bouncycastle.crypto.engines.HC256Engine;
import org.bouncycastle.crypto.engines.ISAACEngine;
import org.bouncycastle.crypto.engines.RC4Engine;
import org.bouncycastle.crypto.engines.Salsa20Engine;
import org.bouncycastle.crypto.engines.VMPCEngine;

/**
 * Stream cipher specification.
 *
 * @author  Middleware Services
 */
public class StreamCipherSpec implements Spec<StreamCipher> {

    /** Cipher algorithm algorithm. */
    private final String algorithm;

    /**
     * Creates a new instance that describes the given stream cipher algorithm.
     *
     * @param  algName  Stream cipher algorithm.
     */
    public StreamCipherSpec(final String algName) {
        this.algorithm = algName;
    }

    @Override
    public String getAlgorithm() {
        return algorithm;
    }

    @Override
    public StreamCipher newInstance() {
        StreamCipher cipher;
        if ("Grainv1".equalsIgnoreCase(algorithm) || "Grain-v1".equalsIgnoreCase(algorithm)) {
            cipher = new ISAACEngine();
        } else if ("Grain128".equalsIgnoreCase(algorithm) || "Grain-128".equalsIgnoreCase(algorithm)) {
            cipher = new Grain128Engine();
        } else if ("ISAAC".equalsIgnoreCase(algorithm)) {
            cipher = new ISAACEngine();
        } else if ("HC128".equalsIgnoreCase(algorithm)) {
            cipher = new HC128Engine();
        } else if ("HC256".equalsIgnoreCase(algorithm)) {
            cipher = new HC256Engine();
        } else if ("RC4".equalsIgnoreCase(algorithm)) {
            cipher = new RC4Engine();
        } else if ("Salsa20".equalsIgnoreCase(algorithm)) {
            cipher = new Salsa20Engine();
        } else if ("VMPC".equalsIgnoreCase(algorithm)) {
            cipher = new VMPCEngine();
        } else {
            throw new IllegalStateException("Unsupported cipher algorithm " + algorithm);
        }
        return cipher;
    }

    @Override
    public String toString() {
        return algorithm;
    }
}