两个Java加密解密例子java 加密解密 示例：http://rian.iteye.com/blog/196031
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Java代码 import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.ObjectInputStream; import java.io.ObjectOutputStream; import java.security.Key; import java.security.MessageDigest; import javax.crypto.Cipher; import javax.crypto.KeyGenerator; public class Demo { public static void main(String args[]) { String password = "administrator"; try { Demo.PrivEncrypt(password,"t.obj"); } catch (Exception e) { e.printStackTrace(); } } /** * * @param oldStr * 要加密的串 * @param keyFile * 私有key所在的文件路径 * @throws Exception */ public static void PrivEncrypt(String oldStr,String keyFile) throws Exception { System.out.println("原始："+oldStr); byte[] plainText = oldStr.getBytes("GBK"); Key key = getPriveKey(keyFile); // 获得一个私鈅加密类Cipher，ECB是加密方式，PKCS5Padding是填充方法 Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding"); cipher.init(Cipher.ENCRYPT_MODE, key);// 使用私鈅加密 byte[] cipherText = cipher.doFinal(plainText); System.out.println("加密："+new String(cipherText, "UTF8")); cipher.init(Cipher.DECRYPT_MODE, key);// 使用私钥解密 byte[] newPlainText = cipher.doFinal(cipherText); System.out.println("解密："+new String(newPlainText, "UTF8")); } // 把Key 写到文件中：生成一个私有Key对象，保存在文件中 public static void setPriveKey(String file) { FileOutputStream fos; try { fos = new FileOutputStream(file); KeyGenerator keyGen = KeyGenerator.getInstance("DES"); keyGen.init(128); Key key = keyGen.generateKey();// 生成私钥Key ObjectOutputStream oos = new ObjectOutputStream(fos); oos.writeObject(key); oos.close(); } catch (Exception e1) { e1.printStackTrace(); } } // 从文件中读Key：客户端可以根据管理员提供的私钥Key文件提取Key对象 public static Key getPriveKey(String file) throws Exception { FileInputStream fis = new FileInputStream(file); ObjectInputStream ois = new ObjectInputStream(fis); Key key = (Key) ois.readObject(); return key; } } /* 运行结果： * 原始：administrator * 加密：!Y????I?? ??R;? * 解密：administrator */ |
DES加密、解密字符串算法:http://www.icnote.com/des-encrypt/
