package net.neptune.util;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.security.Key;
import java.security.MessageDigest;
import java.text.SimpleDateFormat;
import java.util.Date;import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;import org.apache.commons.codec.binary.Base64;
public class CodeUtil {
public static String encoding(String str) {
return Base64.encodeBase64String(str.getBytes());
}
public static String encoding(String str, String charset) throws UnsupportedEncodingException {
return Base64.encodeBase64String(str.getBytes(charset));
}
public static String base64Encoding(byte[] bytes) {
return Base64.encodeBase64String(bytes);
}
public static String decoding(String str) {
return new String(Base64.decodeBase64(str.getBytes()));
}
public static String decoding(String str, String charset) throws UnsupportedEncodingException {
return new String(Base64.decodeBase64(str.getBytes()), charset);
}
public static boolean isBase64(String str) {
return Base64.isBase64(str);
}
public static String md5(String s) {
char hexDigits[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
try {
byte[] btInput = s.getBytes();
// 获得MD5摘要算法的 MessageDigest 对象
MessageDigest mdInst = MessageDigest.getInstance("MD5");
// 使用指定的字节更新摘要
mdInst.update(btInput);
// 获得密文
byte[] md = mdInst.digest();
// 把密文转换成十六进制的字符串形式
int j = md.length;
char str[] = new char[j * 2];
int k = 0;
for (int i = 0; i < j; i++) {
byte byte0 = md[i];
str[k++] = hexDigits[byte0 >>> 4 & 0xf];
str[k++] = hexDigits[byte0 & 0xf];
}
return new String(str);
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
// 创建Base64对象,用于加密和解密;
private final static Base64 base64 = new Base64();
// 加密时采用的编码方式;
private final static String encoding = "UTF-8";
/**
* 基于MD5算法的非对称加密(无解密算法)
*
* @param strSrc 明文
* @return 返回密文
*/
public static String encryptMd5(String strSrc) {
String outString = null;
try {
MessageDigest md5 = MessageDigest.getInstance("MD5");
byte[] outByte = md5.digest(strSrc.getBytes("UTF-8"));
outString = outByte.toString();
} catch (Exception e) {
e.printStackTrace();
}
return outString;
}
/**
* 用Base64对加密好的byte数组进行编码,返回字符串
*
* @param str 需要加密的字符串
* @param sKey 加密密钥
* @return 经过加密的字符串
*/
public static String encryptBase64(String str, String sKey) {
// 声明加密后的结果字符串变量
String result = str;
if (str != null && str.length() > 0 && sKey != null && sKey.length() >= 8) {
try {
// 调用DES 加密数组的 encrypt方法,返回加密后的byte数组;
byte[] encodeByte = encryptBasedDes(str.getBytes(encoding), sKey);
// 调用base64的编码方法,返回加密后的字符串;
result = base64.encodeToString(encodeByte).trim();
} catch (Exception e) {
e.printStackTrace();
}
}
return result;
}
/**
* 用Base64对字符串进行编码,返回byte数组
*
* @param str 需要解密的字符串
* @param sKey 解密密钥
* @return 经过解密的字符串
*/
public static String decryptBase64(String str, String sKey) {
String result = str;
if (str != null && str.length() > 0 && sKey != null && sKey.length() >= 8) {
try {
// 用base64进行编码,返回byte数组
byte[] encodeByte = base64.decode(str);
// 调用DES 解密数组的decrypte方法,返回解密后的数组;
byte[] decoder = decryptBasedDes(encodeByte, sKey);
// 对解密后的数组转化成字符串
result = new String(decoder, encoding).trim();
} catch (Exception e) {
e.printStackTrace();
}
}
return result;
}
/**
* 先用DES算法对byte[]数组加密
*
* @param byteSource 需要加密的数据
* @param sKey 加密密钥
* @return 经过加密的数据
* @throws Exception
*/
private static byte[] encryptBasedDes(byte[] byteSource, String sKey) throws Exception {
try {
// 声明加密模式;
int mode = Cipher.ENCRYPT_MODE;
// 创建密码工厂对象;
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
// 把字符串格式的密钥转成字节数组;
byte[] keyData = sKey.getBytes();
// 以密钥数组为参数,创建密码规则
DESKeySpec keySpec = new DESKeySpec(keyData);
// 以密码规则为参数,用密码工厂生成密码
Key key = keyFactory.generateSecret(keySpec);
// 创建密码对象
Cipher cipher = Cipher.getInstance("DES");
// 以加密模式和密码为参数对密码对象 进行初始化
cipher.init(mode, key);
// 完成最终加密
byte[] result = cipher.doFinal(byteSource);
// 返回加密后的数组
return result;
} catch (Exception e) {
throw e;
}
}
/**
* 先用DES算法对byte[]数组解密
*
* @param byteSource 需要解密的数据
* @param sKey 解密密钥
* @return 经过解密的数据
* @throws Exception
*/
private static byte[] decryptBasedDes(byte[] byteSource, String sKey) throws Exception {
try {
// 声明解密模式;
int mode = Cipher.DECRYPT_MODE;
// 创建密码工厂对象;
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
// 把字符串格式的密钥转成字节数组;
byte[] keyData = sKey.getBytes();
// 以密钥数组为参数,创建密码规则
DESKeySpec keySpec = new DESKeySpec(keyData);
// 以密码规则为参数,用密码工厂生成密码
Key key = keyFactory.generateSecret(keySpec);
// 创建密码对象
Cipher cipher = Cipher.getInstance("DES");
// 以加密模式和密码为参数对密码对象 进行初始化
cipher.init(mode, key);
// 完成最终解密
byte[] result = cipher.doFinal(byteSource);
// 返回解密后的数组
return result;
} catch (Exception e) {
throw e;
}
}
/**
* 测试对称加密算法
*
* @param args
* @throws IOException
*/
public static void main(String[] args) throws IOException {
String sKey = "ningxiayinhang";
String str = "rootroot";
Date date = new Date(System.currentTimeMillis());
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String strDate = simpleDateFormat.format(date);
long start = new Date().getTime();
System.out.println("开始时间:" + strDate + " 毫秒数:" + start);
for (int i = 0; i < 1; i++) {
String strEncrypto = CodeUtil.encryptBase64(str, sKey);
System.out.println("被加密的字符串:" + str + "\r\n加密后的结果:" + strEncrypto);
String strDecrypto = CodeUtil.decryptBase64(strEncrypto, sKey);
System.out.println("解密后的结果:" + strDecrypto);
}
Date date2 = new Date(System.currentTimeMillis());
String strDate2 = simpleDateFormat.format(date2);
long start2 = new Date().getTime();
System.out.println("结束时间:" + strDate2 + " 毫秒数:" + start2);
long time = start2 - start;
System.out.println("间隔时间:" + time);
System.out.println("字符串【6tFt1/dtF38COK5q2gclgA==】解密之后的结果为:"+CodeUtil.decryptBase64("6tFt1/dtF38COK5q2gclgA==", "ningxiayinhang"));
}
}