de.schlichtherle.key.passwd.console.PromptingAesKeyProviderUI Maven / Gradle / Ivy

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TrueZIP is a Java based Virtual File System (VFS) to enable transparent, multi-threaded read/write access to archive files (ZIP, TAR etc.) as if they were directories. Archive files may be arbitrarily nested and the nesting level is only limited by heap and file system size.

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/*
 * Copyright (C) 2006-2010 Schlichtherle IT Services
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package de.schlichtherle.key.passwd.console;

import de.schlichtherle.key.*;

import java.io.*;

/**
 * Extends its base class to enable the user to select the key strength
 * for the AES cipher.
 * This class is thread safe.
 *
 * @author Christian Schlichtherle
 * @since TrueZIP 6.4
 * @version $Id$
 */
public class PromptingAesKeyProviderUI extends PromptingKeyProviderUI {

    protected void promptExtraData(PromptingKeyProvider provider) {
        // We can safely cast the parameter to PromptingAesKeyProvider, because
        // otherwise we would not have been called.
        final PromptingAesKeyProvider aesKeyProvider = ((PromptingAesKeyProvider) provider);

        printf(resources.getString("keyStrength.banner"));
        printf(resources.getString("keyStrength.medium"));
        printf(resources.getString("keyStrength.high"));
        printf(resources.getString("keyStrength.ultra"));

        prompting: while (true) {
            String keyStrength = readLine(
                    resources.getString("keyStrength.prompt"),
                    aesKeyProvider);
            if (keyStrength == null || keyStrength.length() <= 0)
                return;
            try {
                switch (Integer.parseInt(keyStrength)) {
                    case 128:
                        aesKeyProvider.setKeyStrength(
                                AesKeyProvider.KEY_STRENGTH_128);
                        break prompting;

                    case 192:
                        aesKeyProvider.setKeyStrength(
                                AesKeyProvider.KEY_STRENGTH_192);
                        break prompting;

                    case 256:
                        aesKeyProvider.setKeyStrength(
                                AesKeyProvider.KEY_STRENGTH_256);
                        break prompting;
                }
            } catch (NumberFormatException syntaxError) {
            }
        }
    }
}