package com.oying.utils;
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import javax.crypto.Cipher;
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import javax.crypto.SecretKey;
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import javax.crypto.SecretKeyFactory;
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import javax.crypto.spec.DESKeySpec;
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import javax.crypto.spec.IvParameterSpec;
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import java.nio.charset.StandardCharsets;
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/**
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* 加密
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* @author Z
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* @date 2018-11-23
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*/
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public class EncryptUtils {
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private static final String STR_PARAM = "Passw0rd";
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private static final IvParameterSpec IV = new IvParameterSpec(STR_PARAM.getBytes(StandardCharsets.UTF_8));
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private static DESKeySpec getDesKeySpec(String source) throws Exception {
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if (source == null || source.isEmpty()) {
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return null;
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}
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String strKey = "Passw0rd";
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return new DESKeySpec(strKey.getBytes(StandardCharsets.UTF_8));
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}
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/**
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* 对称加密
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*/
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public static String desEncrypt(String source) throws Exception {
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Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
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DESKeySpec desKeySpec = getDesKeySpec(source);
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SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
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SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
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cipher.init(Cipher.ENCRYPT_MODE, secretKey, IV);
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return byte2hex(cipher.doFinal(source.getBytes(StandardCharsets.UTF_8))).toUpperCase();
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}
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/**
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* 对称解密
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*/
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public static String desDecrypt(String source) throws Exception {
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Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
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byte[] src = hex2byte(source.getBytes(StandardCharsets.UTF_8));
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DESKeySpec desKeySpec = getDesKeySpec(source);
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SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
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SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
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cipher.init(Cipher.DECRYPT_MODE, secretKey, IV);
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byte[] retByte = cipher.doFinal(src);
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return new String(retByte);
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}
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private static String byte2hex(byte[] inStr) {
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String stmp;
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StringBuilder out = new StringBuilder(inStr.length * 2);
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for (byte b : inStr) {
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stmp = Integer.toHexString(b & 0xFF);
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if (stmp.length() == 1) {
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out.append("0").append(stmp);
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} else {
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out.append(stmp);
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}
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}
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return out.toString();
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}
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private static byte[] hex2byte(byte[] b) {
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int size = 2;
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if ((b.length % size) != 0) {
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throw new IllegalArgumentException("长度不是偶数");
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}
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byte[] b2 = new byte[b.length / 2];
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for (int n = 0; n < b.length; n += size) {
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String item = new String(b, n, 2);
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b2[n / 2] = (byte) Integer.parseInt(item, 16);
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}
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return b2;
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}
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}
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