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package util;import java.security.SecureRandom;import javax.crypto.spec.DESKeySpec;import javax.crypto.SecretKeyFactory;import javax.crypto.SecretKey;import javax.crypto.Cipher;/**DES加密介绍DES是一种对称加密算法,所谓对称加密算法即:加密和解密使用相同密钥的算法。DES加密算法出自IBM的研究,后来被美国政府正式采用,之后开始广泛流传,但是近些年使用越来越少,因为DES使用56位密钥,以现代计算能力,24小时内即可被破解。虽然如此,在某些简单应用中,我们还是可以使用DES加密算法,本文简单讲解DES的JAVA实现。注意:DES加密和解密过程中,密钥长度都必须是8的倍数*/public class DES { public DES() {}//测试public static void main(String args[]) {//待加密内容String str = "测试内容";//密码,长度要是8的倍数String password = "9588028820109132570743325311898426347857298773549468758875018579537757772163084478873699447306034466200616411960574122434059469100235892702736860872901247123456";byte[] result = DES.encrypt(str.getBytes(),password);System.out.println("加密后:"+new String(result));//直接将如上内容解密try {byte[] decryResult = DES.decrypt(result, password);System.out.println("解密后:"+new String(decryResult));} catch (Exception e1) {e1.printStackTrace();}}/*** 加密* @param datasource byte[]* @param password String* @return byte[]*/public static byte[] encrypt(byte[] datasource, String password) { try{SecureRandom random = new SecureRandom();DESKeySpec desKey = new DESKeySpec(password.getBytes());//创建一个密匙工厂,然后用它把DESKeySpec转换成SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");SecretKey securekey = keyFactory.generateSecret(desKey);//Cipher对象实际完成加密操作Cipher cipher = Cipher.getInstance("DES");//用密匙初始化Cipher对象cipher.init(Cipher.ENCRYPT_MODE, securekey, random);//现在,获取数据并加密//正式执行加密操作return cipher.doFinal(datasource);}catch(Throwable e){e.printStackTrace();}return null;}/*** 解密* @param src byte[]* @param password String* @return byte[]* @throws Exception*/public static byte[] decrypt(byte[] src, String password) throws Exception {// DES算法要求有一个可信任的随机数源SecureRandom random = new SecureRandom();// 创建一个DESKeySpec对象DESKeySpec desKey = new DESKeySpec(password.getBytes());// 创建一个密匙工厂SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");// 将DESKeySpec对象转换成SecretKey对象SecretKey securekey = keyFactory.generateSecret(desKey);// Cipher对象实际完成解密操作Cipher cipher = Cipher.getInstance("DES");// 用密匙初始化Cipher对象cipher.init(Cipher.DECRYPT_MODE, securekey, random);// 真正开始解密操作return cipher.doFinal(src);}}
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