83 lines
2.6 KiB
Java
83 lines
2.6 KiB
Java
package com.xkrs.utils;
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import com.alibaba.fastjson.JSONObject;
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import org.apache.tomcat.util.codec.binary.Base64;
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import org.bouncycastle.jce.provider.BouncyCastleProvider;
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import org.springframework.stereotype.Component;
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import javax.crypto.Cipher;
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import javax.crypto.KeyGenerator;
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import javax.crypto.spec.IvParameterSpec;
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import javax.crypto.spec.SecretKeySpec;
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import java.security.AlgorithmParameters;
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import java.security.Key;
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import java.security.Security;
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/**
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* 解密工具类
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*
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* @Author duyongmeng
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* @Time 2020/11/10
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*/
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@Component
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public class DecodeUtils {
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// 算法名
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public static final String KEY_NAME = "AES";
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// 加解密算法/模式/填充方式
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// ECB模式只用密钥即可对数据进行加密解密，CBC模式需要添加一个iv
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public static final String CIPHER_ALGORITHM = "AES/CBC/PKCS7Padding";
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/**
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* @param encrypted 目标密文
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* @param session_key 会话ID
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* @param iv 加密算法的初始向量
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*/
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public JSONObject wxDecrypt(String encrypted, String session_key, String iv) {
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String json;
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JSONObject jsonObject = null;
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byte[] encrypted64 = Base64.decodeBase64(encrypted);
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byte[] key64 = Base64.decodeBase64(session_key);
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byte[] iv64 = Base64.decodeBase64(iv);
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byte[] data;
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try {
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init();
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json = new String(decrypt(encrypted64, key64, generateIV(iv64)));
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jsonObject = JSONObject.parseObject(json);
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} catch (Exception e) {
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e.printStackTrace();
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}
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return jsonObject;
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}
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/**
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* 初始化密钥
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*/
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public static void init() throws Exception {
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Security.addProvider(new BouncyCastleProvider());
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KeyGenerator.getInstance(KEY_NAME).init(128);
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}
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/**
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* 生成iv
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*/
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public static AlgorithmParameters generateIV(byte[] iv) throws Exception {
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// iv 为一个 16 字节的数组，这里采用和 iOS 端一样的构造方法，数据全为0
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// Arrays.fill(iv, (byte) 0x00);
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AlgorithmParameters params = AlgorithmParameters.getInstance(KEY_NAME);
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params.init(new IvParameterSpec(iv));
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return params;
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}
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/**
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* 生成解密
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*/
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public static byte[] decrypt(byte[] encryptedData, byte[] keyBytes, AlgorithmParameters iv)
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throws Exception {
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Key key = new SecretKeySpec(keyBytes, KEY_NAME);
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Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
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// 设置为解密模式
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cipher.init(Cipher.DECRYPT_MODE, key, iv);
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return cipher.doFinal(encryptedData);
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}
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}
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