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DES对称加密的实现及其源代码(原创)
摘要: DES对称加密的实现及其源代码(原创)
package util;
import javax.crypto.Cipher; import javax.crypto.KeyGenerator; import java.security.*; import java.io.*;
/** * Created by IntelliJ IDEA. * User: Administrator * Date: Dec 4, 2003 * Time: 9:29:19 PM * To change this template use Options | File Templates.
*@author xiaoyusong@etang.com * 该类是加密处理类.主要用来对数据进行加密,解密操作. */ public class DESEncryptUtil { /** * 获得DES加密的密钥。在交易处理的过程中应该定时更 * 换密钥。需要JCE的支持，如果jdk版本低于1.4，则需要 * 安装jce-1_2_2才能正常使用。 * @return Key 返回对称密钥 * @throws java.security.NoSuchAlgorithmException * @see util.EncryptUtil 其中包括加密和解密的方法 */ public static Key getKey() throws NoSuchAlgorithmException { Security.insertProviderAt(new com.sun.crypto.provider.SunJCE(), 1); KeyGenerator generator = KeyGenerator.getInstance("DES"); generator.init(new SecureRandom()); Key key = generator.generateKey(); return key; }
/** * 将指定的数据根据提供的密钥进行加密 * @param key 密钥 * @param data 需要加密的数据 * @return byte[] 加密后的数据 * @throws util.EncryptException */ public static byte[] doEncrypt(Key key, byte[] data) throws EncryptException { try { //Get a cipher object Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
//Encrypt cipher.init(Cipher.ENCRYPT_MODE, key); //byte[] stringBytes = amalgam.getBytes("UTF8"); byte[] raw = cipher.doFinal(data); //BASE64Encoder encoder = new BASE64Encoder(); //String base64 = encoder.encode(raw); return raw; } catch (Exception e) { e.printStackTrace(); throw new EncryptException("Do encrypt occurs Exception.[" + e.getMessage() + "]"); } }
/** * 将给定的已加密的数据通过指定的密钥进行解密 * @param key 密钥 * @param raw 待解密的数据 * @return byte[] 解密后的数据 * @throws util.EncryptException */ public static byte[] doDecrypt(Key key, byte[] raw) throws EncryptException { try { //Get a cipher object Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding"); // Decrypt cipher.init(Cipher.DECRYPT_MODE, key); //BASE64Decoder decoder = new BASE64Decoder(); //byte[] raw = decoder.decodeBuffer(data); byte[] data = cipher.doFinal(raw); //String result = new String(stringBytes, "UTF8"); //System.out.println("the decrypted data is: " + result); return data; } catch (Exception e) { e.printStackTrace(); throw new EncryptException("Do decrypt occurs Exception.[" + e.getMessage() + "]"); } }
/** * 得到一个密钥的密码 * @param key 密钥 * @param cipherMode 密码的类型 * @return Cipher * @throws util.EncryptException 当加密出现异常情况时,产生异常信息 */ public static Cipher getCipher(Key key, int cipherMode) throws EncryptException { try { Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding"); cipher.init(cipherMode, key); return cipher; } catch (Exception e) { e.printStackTrace(); throw new EncryptException("Generate Cipher occurs Exception.[" + e.getMessage() + "]"); } }
public static void main(String[] args) throws Exception { Key key = DESEncryptUtil.getKey(); File file = new File("test.html");//随便找个文件发在当前运行目录下 FileInputStream in = new FileInputStream(file); ByteArrayOutputStream bout = new ByteArrayOutputStream(); byte[] tmpbuf = new byte[1024]; int count = 0; while ((count = in.read(tmpbuf)) != -1) { bout.write(tmpbuf, 0, count); tmpbuf = new byte[1024]; } in.close(); byte[] orgData = bout.toByteArray(); byte[] raw = DESEncryptUtil.doEncrypt(key,orgData); file = new File("encrypt_result.dat"); OutputStream out = new FileOutputStream(file); out.write(raw); out.close();
byte[] data = DESEncryptUtil.doDecrypt(key, raw); file = new File("decrypt_result.html"); out = new FileOutputStream(file); out.write(data); out.flush(); out.close(); } }
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对该文的评论 人气：560 swei412(2004-5-26 11:07:49)
这就是所谓的DES对称加密的实现及其源代码? 这顶多只能算如何使用java提供的DES算法实现的demo。
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