get DES Value - Java Security

Java examples for Security:DES

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Description

get DES Value

Demo Code

/**// ww w.  jav a 2 s .co  m
 * The contents of this file are subject to the terms
 * of the Common Development and Distribution License
 * (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.zhuangxulin.com/licenses/LICENSE-1.0
          
 * 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 com.java2s;
import java.io.BufferedInputStream;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;

import java.io.IOException;

public class Main {

    public static byte[] getDESValue(String desFilePath) throws IOException {
        File f = new File(desFilePath);
        if (!f.exists()) {
            throw new FileNotFoundException(desFilePath);
        }

        ByteArrayOutputStream bos = new ByteArrayOutputStream(
                (int) f.length());
        BufferedInputStream in = null;
        try {
            in = new BufferedInputStream(new FileInputStream(f));
            int buf_size = 1024;
            byte[] buffer = new byte[buf_size];
            int len = 0;
            while (-1 != (len = in.read(buffer, 0, buf_size))) {
                bos.write(buffer, 0, len);
            }
            return bos.toByteArray();
        } catch (IOException e) {
            e.printStackTrace();
            throw e;
        } finally {
            try {
                in.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            bos.close();
        }
    }
}

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