TA的每日心情 | 开心 2021-12-13 21:45 |
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签到天数: 15 天 [LV.4]偶尔看看III
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写在前面的话:
1.建议加密后将密文转为16进制的字符串(便于观看)。
2.以下的两种加密的方法密钥不限定长度。
- /**
- *AES加密解密工具类
- *@author M-Y
- */
- public class AESUtil {
- private static final Logger logger = Logger.getLogger(AESUtil.class);
- private static final String defaultCharset = "UTF-8";
- private static final String KEY_AES = "AES";
- private static final String KEY = "123456";
- /**
- * 加密
- *
- * @param data 需要加密的内容
- * @param key 加密密码
- * @return
- */
- public static String encrypt(String data, String key) {
- return doAES(data, key, Cipher.ENCRYPT_MODE);
- }
- /**
- * 解密
- *
- * @param data 待解密内容
- * @param key 解密密钥
- * @return
- */
- public static String decrypt(String data, String key) {
- return doAES(data, key, Cipher.DECRYPT_MODE);
- }
- /**
- * 加解密
- *
- * @param data 待处理数据
- * @param password 密钥
- * @param mode 加解密mode
- * @return
- */
- private static String doAES(String data, String key, int mode) {
- try {
- if (StringUtils.isBlank(data) || StringUtils.isBlank(key)) {
- return null;
- }
- //判断是加密还是解密
- boolean encrypt = mode == Cipher.ENCRYPT_MODE;
- byte[] content;
- //true 加密内容 false 解密内容
- if (encrypt) {
- content = data.getBytes(defaultCharset);
- } else {
- content = parseHexStr2Byte(data);
- }
- //1.构造密钥生成器,指定为AES算法,不区分大小写
- KeyGenerator kgen = KeyGenerator.getInstance(KEY_AES);
- //2.根据ecnodeRules规则初始化密钥生成器
- //生成一个128位的随机源,根据传入的字节数组
- kgen.init(128, new SecureRandom(key.getBytes()));
- //3.产生原始对称密钥
- SecretKey secretKey = kgen.generateKey();
- //4.获得原始对称密钥的字节数组
- byte[] enCodeFormat = secretKey.getEncoded();
- //5.根据字节数组生成AES密钥
- SecretKeySpec keySpec = new SecretKeySpec(enCodeFormat, KEY_AES);
- //6.根据指定算法AES自成密码器
- Cipher cipher = Cipher.getInstance(KEY_AES);// 创建密码器
- //7.初始化密码器,第一个参数为加密(Encrypt_mode)或者解密解密(Decrypt_mode)操作,第二个参数为使用的KEY
- cipher.init(mode, keySpec);// 初始化
- byte[] result = cipher.doFinal(content);
- if (encrypt) {
- //将二进制转换成16进制
- return parseByte2HexStr(result);
- } else {
- return new String(result, defaultCharset);
- }
- } catch (Exception e) {
- logger.error("AES 密文处理异常", e);
- }
- return null;
- }
- /**
- * 将二进制转换成16进制
- *
- * @param buf
- * @return
- */
- public static String parseByte2HexStr(byte buf[]) {
- StringBuilder sb = new StringBuilder();
- for (int i = 0; i < buf.length; i++) {
- String hex = Integer.toHexString(buf[i] & 0xFF);
- if (hex.length() == 1) {
- hex = "0" + hex;
- }
- sb.append(hex.toUpperCase());
- }
- return sb.toString();
- }
- /**
- * 将16进制转换为二进制
- *
- * @param hexStr
- * @return
- */
- public static byte[] parseHexStr2Byte(String hexStr) {
- if (hexStr.length() < 1) {
- return null;
- }
- byte[] result = new byte[hexStr.length() / 2];
- for (int i = 0; i < hexStr.length() / 2; i++) {
- int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16);
- int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2), 16);
- result[i] = (byte) (high * 16 + low);
- }
- return result;
- }
- public static void main(String[] args) throws Exception {
- String content = "{"repairPhone":"18547854787","customPhone":"12365478965","captchav":"58m7"}";
- System.out.println("加密前:" + content);
- System.out.println("加密密钥和解密密钥:" + KEY);
- String encrypt = encrypt(content, KEY);
- System.out.println("加密后:" + encrypt);
- String decrypt = decrypt(encrypt, KEY);
- System.out.println("解密后:" + decrypt);
- }
- }
复制代码 输出结果:
- 加密前:{"repairPhone":"18547854787","customPhone":"12365478965","captchav":"58m7"}加密密钥和解密密钥:123456加密后:2A3D75862E69BF61DFAD94017E930227A715C8E533AA1A12361D6BE6E190EC5EE77AA66CAC8005A643BFB26134EE60398C30104B1F7FB3CC6B78795368A86D8215B88A5C80D9C2E4936EEEB0DECA7A88解密后:{"repairPhone":"18547854787","customPhone":"12365478965","captchav":"58m7"}
复制代码 方法二:替换AESUtil 类中的doAES方法并加上以下成员
- private static final String KEY_MD5 = "MD5";
- private static MessageDigest md5Digest;
- static {
- try {
- md5Digest = MessageDigest.getInstance(KEY_MD5);
- } catch (NoSuchAlgorithmException e) {
- //
- }
- }
复制代码 doAES方法:
- /**
- * 加解密
- *
- * @param data
- * @param key
- * @param mode
- * @return
- */
- private static String doAES(String data, String key, int mode) {
- try {
- if (StringUtils.isBlank(data) || StringUtils.isBlank(key)) {
- return null;
- }
- boolean encrypt = mode == Cipher.ENCRYPT_MODE;
- byte[] content;
- //true 加密内容 false 解密内容
- if (encrypt) {
- content = data.getBytes(defaultCharset);
- } else {
- content = parseHexStr2Byte(data);
- }
- SecretKeySpec keySpec = new SecretKeySpec(md5Digest.digest(key.getBytes(defaultCharset)), KEY_AES);//构造一个密钥
- Cipher cipher = Cipher.getInstance(KEY_AES);// 创建密码器
- cipher.init(mode, keySpec);// 初始化
- byte[] result = cipher.doFinal(content);//加密或解密
- if (encrypt) {
- return parseByte2HexStr(result);
- } else {
- return new String(result, defaultCharset);
- }
- } catch (Exception e) {
- logger.error("AES 密文处理异常", e);
- }
- return null;
- }
复制代码
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