package com.fastbee.iot.util;
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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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import sun.misc.BASE64Decoder;
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import sun.misc.BASE64Encoder;
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import java.security.MessageDigest;
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/**
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*
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*/
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public class AESUtils {
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/**
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* 加密用的Key 可以用26个字母和数字组成 使用AES-128-CBC加密模式,key需要为16位。iv 偏移量,长度16
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*/
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private static final String ivString = "wumei-smart-open";
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private static final String ENCRYPT_MODE = "CBC"; // ECB和CBC两种模式
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// 加密
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public static String encrypt(String plainText, String key) {
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// 判断Key是否正确
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if (key == null || key.length() != 16) {
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System.out.print("Key不能为空,长度不是16位");
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return null;
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}
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try {
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byte[] raw = key.getBytes("utf-8");
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SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
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Cipher cipher = Cipher.getInstance("AES/" + AESUtils.ENCRYPT_MODE + "/PKCS5Padding");
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if (AESUtils.ENCRYPT_MODE.equals("ECB")) {
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cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
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} else {
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IvParameterSpec iv = new IvParameterSpec(ivString.getBytes("utf-8"));//使用CBC模式,需要一个向量iv,可增加加密算法的强度
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cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
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}
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byte[] encrypted = cipher.doFinal(plainText.getBytes("utf-8"));
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String encryptedStr = new String(new BASE64Encoder().encode(encrypted));
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//此处使用BASE64做转码功能,同时能起到2次加密的作用。
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return encryptedStr;
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} catch (Exception ex) {
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System.out.println(ex.toString());
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return null;
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}
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}
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// 解密
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public static String decrypt(String cipherText, String key) {
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// 判断Key是否正确
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if (key == null || key.length() != 16) {
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System.out.print("Key不能为空,长度不是16位");
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return null;
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}
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// 根据html规范,后端接口,接收参数包含+号会被替换为空格。所以这里需要还原回来,不然会造成解密失败
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cipherText=cipherText.replace(' ','+');
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try {
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byte[] raw = key.getBytes("utf-8");
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SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
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Cipher cipher = Cipher.getInstance("AES/" + AESUtils.ENCRYPT_MODE + "/PKCS5Padding");
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if (AESUtils.ENCRYPT_MODE.equals("ECB")) {
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cipher.init(Cipher.DECRYPT_MODE, skeySpec);
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} else {
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//使用CBC模式,需要一个向量iv,可增加加密算法的强度
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IvParameterSpec iv = new IvParameterSpec(ivString.getBytes("utf-8"));
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cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
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}
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//先用base64解密
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byte[] encrypted = new BASE64Decoder().decodeBuffer(cipherText);
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try {
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byte[] original = cipher.doFinal(encrypted);
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String originalString = new String(original, "utf-8");
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return originalString;
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} catch (Exception e) {
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System.out.println(e.toString());
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return null;
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}
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} catch (Exception ex) {
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System.out.println(ex.toString());
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return null;
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}
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}
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/**
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* 进行MD5加密
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*
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* @param s 要进行MD5转换的字符串
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* @return 该字符串的MD5值的8-24位
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*/
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public static String getMD5(String s) {
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char hexDigits[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
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try {
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byte[] btInput = s.getBytes();
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// 获得MD5摘要算法的 MessageDigest 对象
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MessageDigest mdInst = MessageDigest.getInstance("MD5");
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// 使用指定的字节更新摘要
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mdInst.update(btInput);
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// 获得密文
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byte[] md = mdInst.digest();
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// 把密文转换成十六进制的字符串形式
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int j = md.length;
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char str[] = new char[j * 2];
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int k = 0;
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for (int i = 0; i < j; i++) {
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byte byte0 = md[i];
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str[k++] = hexDigits[byte0 >>> 4 & 0xf];
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str[k++] = hexDigits[byte0 & 0xf];
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}
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return new String(str).substring(8, 24);
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} catch (Exception e) {
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e.printStackTrace();
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return null;
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}
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}
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}
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