算法加密

package org.jeecgframework.core.util;import java.security.Key;import java.security.SecureRandom;import javax.crypto.Cipher;import javax.crypto.SecretKey;import javax.crypto.SecretKeyFactory;import javax.crypto.spec.PBEKeySpec;import javax.crypto.spec.PBEParameterSpec;public class PasswordUtil {/*** JAVA6支持以下任意一种算法 PBEWITHMD5ANDDES PBEWITHMD5ANDTRIPLEDES* PBEWITHSHAANDDESEDE PBEWITHSHA1ANDRC2_40 PBKDF2WITHHMACSHA1* *//*** 定义使用的算法为:PBEWITHMD5andDES算法*/public static final String ALGORITHM = "PBEWithMD5AndDES";//加密算法public static final String Salt = "63293188";//密钥/*** 定义迭代次数为1000次*/private static final int ITERATIONCOUNT = 1000;/*** 获取加密算法中使用的盐值,解密中使用的盐值必须与加密中使用的相同才能完成操作. 盐长度必须为8字节* * @return byte[] 盐值* */public static byte[] getSalt() throws Exception {// 实例化安全随机数SecureRandom random = new SecureRandom();// 产出盐return random.generateSeed(8);}public static byte[] getStaticSalt() {// 产出盐return Salt.getBytes();}/*** 根据PBE密码生成一把密钥* * @param password*            生成密钥时所使用的密码* @return Key PBE算法密钥* */private static Key getPBEKey(String password) {// 实例化使用的算法SecretKeyFactory keyFactory;SecretKey secretKey = null;try {keyFactory = SecretKeyFactory.getInstance(ALGORITHM);// 设置PBE密钥参数PBEKeySpec keySpec = new PBEKeySpec(password.toCharArray());// 生成密钥secretKey = keyFactory.generateSecret(keySpec);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}return secretKey;}/*** 加密明文字符串* * @param plaintext*            待加密的明文字符串* @param password*            生成密钥时所使用的密码* @param salt*            盐值* @return 加密后的密文字符串* @throws Exception*/public static String encrypt(String plaintext, String password, byte[] salt) {Key key = getPBEKey(password);byte[] encipheredData = null;PBEParameterSpec parameterSpec = new PBEParameterSpec(salt, ITERATIONCOUNT);try {Cipher cipher = Cipher.getInstance(ALGORITHM);cipher.init(Cipher.ENCRYPT_MODE, key, parameterSpec);encipheredData = cipher.doFinal(plaintext.getBytes());} catch (Exception e) {}return bytesToHexString(encipheredData);}/*** 解密密文字符串* * @param ciphertext*            待解密的密文字符串* @param password*            生成密钥时所使用的密码(如需解密,该参数需要与加密时使用的一致)* @param salt*            盐值(如需解密,该参数需要与加密时使用的一致)* @return 解密后的明文字符串* @throws Exception*/public static String decrypt(String ciphertext, String password, byte[] salt) {Key key = getPBEKey(password);byte[] passDec = null;PBEParameterSpec parameterSpec = new PBEParameterSpec(getStaticSalt(), ITERATIONCOUNT);try {Cipher cipher = Cipher.getInstance(ALGORITHM);cipher.init(Cipher.DECRYPT_MODE, key, parameterSpec);passDec = cipher.doFinal(hexStringToBytes(ciphertext));}catch (Exception e) {// TODO: handle exception}return new String(passDec);}/*** 将字节数组转换为十六进制字符串* * @param src*            字节数组* @return*/public static String bytesToHexString(byte[] src) {StringBuilder stringBuilder = new StringBuilder("");if (src == null || src.length <= 0) {return null;}for (int i = 0; i < src.length; i++) {int v = src[i] & 0xFF;String hv = Integer.toHexString(v);if (hv.length() < 2) {stringBuilder.append(0);}stringBuilder.append(hv);}return stringBuilder.toString();}/*** 将十六进制字符串转换为字节数组* * @param hexString*            十六进制字符串* @return*/public static byte[] hexStringToBytes(String hexString) {if (hexString == null || hexString.equals("")) {return null;}hexString = hexString.toUpperCase();int length = hexString.length() / 2;char[] hexChars = hexString.toCharArray();byte[] d = new byte[length];for (int i = 0; i < length; i++) {int pos = i * 2;d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));}return d;}private static byte charToByte(char c) {return (byte) "0123456789ABCDEF".indexOf(c);}public static void main(String[] args) {int i=10;for (int j = 0; j < i; j++) {if((j)%3==0){System.out.print("<br>");}else {System.out.print(j);}}System.out.print(-1%2==0);String str = "admin";String password = "123456";org.jeecgframework.core.util.LogUtil.info("明文:" + str);org.jeecgframework.core.util.LogUtil.info("密码:" + password);try {byte[] salt = PasswordUtil.getStaticSalt();String ciphertext = PasswordUtil.encrypt(str, password, salt);org.jeecgframework.core.util.LogUtil.info("密文:" + ciphertext);String plaintext = PasswordUtil.decrypt(ciphertext, password, salt);org.jeecgframework.core.util.LogUtil.info("明文:" + plaintext);} catch (Exception e) {e.printStackTrace();}}}