package com.xinquan.common.core.utils;
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import java.net.URLDecoder;
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import java.net.URLEncoder;
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import javax.crypto.Cipher;
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import javax.crypto.spec.IvParameterSpec;
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import javax.crypto.spec.SecretKeySpec;
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public class DES {
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/*
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* 不要写成：Cipher cipher = Cipher.getInstance("DES");
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* 或：Cipher cipher = Cipher.getInstance("DES/CBC/NoPadding");
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* 原因是Cipher cipher = Cipher.getInstance("DES");
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* 与Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
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* 等同，填充方式错误，加密的时候会得到16长度的字节数组。
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* 应该写成
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* Cipher cipher = Cipher.getInstance("DES/ECB/NoPadding");
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*/
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private static final String KEY = "hfh7L4nUzKcnK6JtJ5z27ygad5p9EanZn5wCT6Zw9KvctK5hs7Z8FsjDEpShmC5W";
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private static byte[] iv = {25, 24, 40, 41, 60, 68, 70, 97};
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/**
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* 指定密钥加密
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*
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* @param encryptString 原文
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* @param encryptKey 密钥
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* @return 密文
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* @throws Exception
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*/
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public static String encryptDES(String encryptString, String encryptKey)
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throws Exception {
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IvParameterSpec zeroIv = new IvParameterSpec(iv);
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SecretKeySpec key = new SecretKeySpec(encryptKey.getBytes(), "DES");
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Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
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cipher.init(Cipher.ENCRYPT_MODE, key, zeroIv);
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byte[] encryptedData = cipher.doFinal(encryptString.getBytes());
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return Base64DES.encode(encryptedData);
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}
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/**
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* 指定密钥进行解密
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*
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* @param decryptString 密文
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* @param decryptKey 密钥
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* @return 原文
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* @throws Exception
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*/
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public static String decryptDES(String decryptString, String decryptKey)
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throws Exception {
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byte[] byteMi = Base64DES.decode(decryptString);
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IvParameterSpec zeroIv = new IvParameterSpec(iv);
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SecretKeySpec key = new SecretKeySpec(decryptKey.getBytes(), "DES");
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Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
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cipher.init(Cipher.DECRYPT_MODE, key, zeroIv);
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byte decryptedData[] = cipher.doFinal(byteMi);
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return new String(decryptedData);
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}
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/**
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* 默认密钥加密
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*
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* @param encryptString 原文
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* @return 密文
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* @throws Exception
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*/
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public static String encryptDES(String encryptString)
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throws Exception {
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IvParameterSpec zeroIv = new IvParameterSpec(iv);
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SecretKeySpec key = new SecretKeySpec(KEY.getBytes(), "DES");
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Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
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cipher.init(Cipher.ENCRYPT_MODE, key, zeroIv);
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byte[] encryptedData = cipher.doFinal(encryptString.getBytes());
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return Base64DES.encode(encryptedData);
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}
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/**
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* 默认密钥解密
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*
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* @param decryptString 密文
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* @return 解密得到的原文
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* @throws Exception
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*/
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public static String decryptDES(String decryptString)
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throws Exception {
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byte[] byteMi = Base64DES.decode(decryptString);
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IvParameterSpec zeroIv = new IvParameterSpec(iv);
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SecretKeySpec key = new SecretKeySpec(KEY.getBytes(), "DES");
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Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
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cipher.init(Cipher.DECRYPT_MODE, key, zeroIv);
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byte decryptedData[] = cipher.doFinal(byteMi);
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return new String(decryptedData, "UTF-8");
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}
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public static String parseByte2HexStr(byte buf[]) {
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StringBuffer sb = new StringBuffer();
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for (int i = 0; i < buf.length; i++) {
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String hex = Integer.toHexString(buf[i] & 0xFF);
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if (hex.length() == 1) {
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hex = '0' + hex;
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}
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sb.append(hex.toUpperCase());
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}
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return sb.toString();
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}
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public static void main(String[] args) {
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String plaintext = "server=/app/public/getAllRegionList";
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try {
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System.out.println("明文：" + plaintext);
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System.out.println("密钥：" + KEY);
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System.out.println("DES密文：" + DES.encryptDES(plaintext));
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System.out.println("DES解密：" + DES.decryptDES(DES.encryptDES(plaintext)));
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System.out.println(
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"URLEncoder加密：" + URLEncoder.encode(DES.encryptDES(plaintext), "UTF-8"));
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System.out.println("URLEncoder解密：" + URLDecoder.decode(
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URLEncoder.encode(DES.encryptDES(plaintext), "UTF-8"), "UTF-8"));
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System.out.println("长度："
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+ "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".length());
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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}
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