java 如何加密

Java  /  管理员 发布于 8年前   195

第一种，DES加密和解密

import java.security.Key;import java.security.SecureRandom; import javax.crypto.Cipher;import javax.crypto.KeyGenerator; import org.slf4j.Logger;import org.slf4j.LoggerFactory;import sun.misc.BASE64Decoder;import sun.misc.BASE64Encoder; /** * DES是一种对称加密算法，所谓对称加密算法:加密和解密使用相同的秘钥的算法 * @author llp * */public class DESUtil {private static final Logger logger = LoggerFactory.getLogger(DESUtil.class); private static Key key;//设置秘钥keyprivate static String KEY_STR="myKey";private static String CHARSETNAME="UTF-8";private static String ALGORITHM="DES";static{try{//生成DES算法对象KeyGenerator generator=KeyGenerator.getInstance(ALGORITHM);//运用SHA1安全策略SecureRandom secureRandom=SecureRandom.getInstance("SHA1PRNG");//设置上密钥种子secureRandom.setSeed(KEY_STR.getBytes());//初始化基于SHA1的算法对象generator.init(secureRandom);//生成密钥对象key=generator.generateKey();generator=null;}catch(Exception e){throw new RuntimeException(e);}}/*** 获取加密的信息* @param str* @return*/public static String getEncryptString(String str){//基于BASE64编码，接收byte[]并转换成StringBASE64Encoder base64Encoder=new BASE64Encoder();try {// 按UTF8编码byte[] bytes = str.getBytes(CHARSETNAME);// 获取加密对象Cipher cipher = Cipher.getInstance(ALGORITHM);// 初始化密码信息cipher.init(Cipher.ENCRYPT_MODE, key);// 加密byte[] doFinal = cipher.doFinal(bytes);// byte[]to encode好的String并返回return base64Encoder.encode(doFinal);} catch (Exception e) {throw new RuntimeException(e);}}/*** 获取解密之后的信息* * @param str* @return*/public static String getDecryptString(String str) {// 基于BASE64编码，接收byte[]并转换成StringBASE64Decoder base64decoder = new BASE64Decoder();try {// 将字符串decode成byte[]byte[] bytes = base64decoder.decodeBuffer(str);// 获取解密对象Cipher cipher = Cipher.getInstance(ALGORITHM);// 初始化解密信息cipher.init(Cipher.DECRYPT_MODE, key);// 解密byte[] doFinal = cipher.doFinal(bytes);// 返回解密之后的信息return new String(doFinal, CHARSETNAME);} catch (Exception e) {throw new RuntimeException(e);}}public static void main(String[] args) {//加密logger.info(getEncryptString("root"));//WnplV/ietfQ=logger.info(getEncryptString("123456"));//QAHlVoUc49w=//解密logger.info(getDecryptString(getEncryptString("root")));//rootlogger.info(getDecryptString(getEncryptString("123456")));//123456}}

第二种，MD5加密

import java.security.MessageDigest;/** * MD5加密 * @author llp * */public class MD5 { /*** 对传入的String进行MD5加密* * @param s* @return*/public static final String getMd5(String s) {// 16进制数组char hexDigits[] = { '5', '0', '5', '6', '2', '9', '6', '2', '5', 'q', 'b', 'l', 'e', 's', 's', 'y' };try {char str[];// 将传入的字符串转换成byte数组byte strTemp[] = s.getBytes();// 获取MD5加密对象MessageDigest mdTemp = MessageDigest.getInstance("MD5");// 传入需要加密的目标数组mdTemp.update(strTemp);// 获取加密后的数组byte md[] = mdTemp.digest();int j = md.length;str = new char[j * 2];int k = 0;// 将数组做位移for (int i = 0; i < j; i++) {byte byte0 = md[i];str[k++] = hexDigits[byte0 >>> 4 & 0xf];str[k++] = hexDigits[byte0 & 0xf];}// 转换成String并返回return new String(str);} catch (Exception e) {return null;}} public static void main(String[] args) {System.out.println(MD5.getMd5("123456"));//s05bse6q2qlb9qblls96s592y55y556s}}

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