package com.hx.util.mysql.aes;
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import com.hx.util.StringUtils;
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import org.apache.commons.codec.binary.Hex;
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import javax.crypto.Cipher;
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import javax.crypto.spec.SecretKeySpec;
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import java.io.UnsupportedEncodingException;
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import java.util.regex.Pattern;
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/**
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* mybatis数据库的AES_ENCRYPT（加密）和AES_DECRYPT（解密）
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* mybatis数据库的HEX（加壳）UNHEX（解壳）
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* @author CJH
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* @Date 2021-01-06
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*/
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public class MysqlHexAesTool {
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public static SecretKeySpec generateMySQLAESKey(final String key, final String encoding) {
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try {
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final byte[] finalKey = new byte[16];
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int i = 0;
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for(byte b : key.getBytes(encoding)) {
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finalKey[i++%16] ^= b;
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}
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return new SecretKeySpec(finalKey, "AES");
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} catch(UnsupportedEncodingException e) {
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throw new RuntimeException(e);
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}
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}
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/**AES 解密
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* @param data 需要解密的数据
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* @param aesKey 秘钥
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* @param encoding 编码，不填默认UTF-8
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* @return 解密数据
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*/
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public static String decryptData(String data,String aesKey,String encoding) {
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try{
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if(data == null){
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return null;
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}
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if(!isHexStrValid(data)){
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return data;
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}
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if(StringUtils.isEmpty(encoding)){
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encoding = "UTF-8";
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}
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// Decrypt
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final Cipher decryptCipher = Cipher.getInstance("AES");
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decryptCipher.init(Cipher.DECRYPT_MODE, generateMySQLAESKey(aesKey, encoding));
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data = new String(decryptCipher.doFinal(Hex.decodeHex(data.toCharArray())));
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}catch (Exception e){
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throw new RuntimeException(e);
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}
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return data;
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}
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/**AES加密
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* @param data 需要解密的数据
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* @param aesKey 秘钥
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* @param encoding 编码，不填默认UTF-8
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* @return 返回大写加密的数据
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*/
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public static String encryptData(String data,String aesKey,String encoding) {
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try {
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if(data == null){
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return null;
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}
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if (StringUtils.isEmpty(encoding)) {
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encoding = "UTF-8";
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}
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// Encrypt
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final Cipher encryptCipher = Cipher.getInstance("AES");
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encryptCipher.init(Cipher.ENCRYPT_MODE, generateMySQLAESKey(aesKey, encoding));
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char[] code = Hex.encodeHex(encryptCipher.doFinal(data.getBytes(encoding)));
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StringBuilder builder = new StringBuilder();
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for (char d : code) {
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builder.append(d);
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}
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data = builder.toString().toUpperCase();
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} catch (Exception e) {
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throw new RuntimeException(e);
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}
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return data;
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}
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/**
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* 判断是不是十六进制的字符串（字母是大写的）
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* @param str 需要判断的字符串
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* @return true or false
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*/
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public static boolean isHexStrValid(String str) {
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if(str == null){
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return false;
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}
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//是否32位倍数
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if(str.length()%32 != 0){
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return false;
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}
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String pattern = "^[0-9A-F]+$";
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return Pattern.compile(pattern).matcher(str).matches();
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}
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}
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