104 lines
2.6 KiB
Java
Executable File
104 lines
2.6 KiB
Java
Executable File
package com.windchat.common.crypto;
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import java.security.SecureRandom;
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import javax.crypto.Cipher;
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import javax.crypto.KeyGenerator;
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import javax.crypto.SecretKey;
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import javax.crypto.spec.SecretKeySpec;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import com.windchat.common.constant.CharsetCoding;
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public class AESCrypto {
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private static final Logger logger = LoggerFactory.getLogger(AESCrypto.class);
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/**
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* <pre>
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* AES四种加密模式：
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* ECB模式：有利于并行计算
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* CBC模式：不容易攻击，安全性高于ECB模式，适合传输长度长的报文，是SSL，IPSec的标准，不利于并行计算
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* CFB模式：不利于并行计算
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* OFB模式：不利于并行计算
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* </pre>
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*/
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public static final String ALGORITHM = "AES/ECB/PKCS5Padding";
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/**
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* 随机生成AES加密解密KEY
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*
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* @return
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*/
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public static byte[] generateTSKey() {
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try {
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KeyGenerator kg = KeyGenerator.getInstance("AES");
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kg.init(128);
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SecretKey secretKey = kg.generateKey();
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return secretKey.getEncoded();
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} catch (Exception e) {
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logger.error("generate ts key error", e);
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}
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return null;
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}
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/**
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* 通过key生成AES加密解密key
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*
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* @param key
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* @return
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*/
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public static byte[] generateTSKey(String key) {
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try {
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KeyGenerator kgen = KeyGenerator.getInstance("AES");
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SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
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secureRandom.setSeed(key.getBytes(CharsetCoding.ISO_8859_1));
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kgen.init(128, secureRandom);
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SecretKey secretKey = kgen.generateKey();
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return secretKey.getEncoded();
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} catch (Exception e) {
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logger.error("generate ts key error by key=" + key, e);
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}
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return null;
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}
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/**
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* 加密内容
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*
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* @param tsk
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* @param content
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* @return
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*/
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public static byte[] encrypt(byte[] tsk, byte[] content) {
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try {
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SecretKeySpec key = new SecretKeySpec(tsk, "AES");
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Cipher cipher = Cipher.getInstance(ALGORITHM);// 创建密码器
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cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化
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return cipher.doFinal(content);
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} catch (Exception e) {
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logger.error("aes encrypt error tsk-size={} content-size={}", tsk.length, content.length);
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}
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return null;
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}
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/**
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* 解密内容
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*
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* @param tsk
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* @param content
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* @return
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*/
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public static byte[] decrypt(byte[] tsk, byte[] content) {
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try {
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SecretKeySpec key = new SecretKeySpec(tsk, "AES");
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Cipher cipher = Cipher.getInstance(ALGORITHM);// 创建密码器
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cipher.init(Cipher.DECRYPT_MODE, key);// 初始化
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return cipher.doFinal(content);
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} catch (Exception e) {
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logger.error("AES decrypt error,tsk-len={} content-len={}", tsk.length, content.length);
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}
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return null;
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}
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} |