package com.hx.mp.util;
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import com.sun.org.apache.xerces.internal.impl.dv.util.Base64;
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import net.sf.json.JSONObject;
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import org.bouncycastle.jce.provider.BouncyCastleProvider;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.io.UnsupportedEncodingException;
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import java.security.AlgorithmParameters;
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import java.security.InvalidAlgorithmParameterException;
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import java.security.InvalidKeyException;
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import java.security.Key;
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import java.security.NoSuchAlgorithmException;
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import java.security.NoSuchProviderException;
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import java.security.Security;
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import javax.crypto.BadPaddingException;
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import javax.crypto.Cipher;
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import javax.crypto.IllegalBlockSizeException;
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import javax.crypto.NoSuchPaddingException;
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import javax.crypto.spec.IvParameterSpec;
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import javax.crypto.spec.SecretKeySpec;
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public class WechatUtil {
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public static boolean initialized = false;
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//log4j日志
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private static Logger logger = LoggerFactory.getLogger(WechatUtil.class.getName());
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public static JSONObject encryptedData(String encryptedData, String session_key, String iv) throws Exception {
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JSONObject encrypted_obj = null;
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byte[] resultByte =decrypt(Base64.decode(encryptedData),
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Base64.decode(session_key),
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Base64.decode(iv));
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if(null != resultByte && resultByte.length > 0){
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String userInfo = new String(resultByte, "UTF-8");
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encrypted_obj = JSONObject.fromObject(userInfo);
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}else{
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logger.error("获取unionid解密失败：encryptedData="+encryptedData+";session_key="+session_key+";iv="+iv);
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}
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return encrypted_obj;
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}
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/**
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* AES解密
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* @param content 密文
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* @return
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* @throws InvalidAlgorithmParameterException
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* @throws NoSuchProviderException
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*/
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public static byte[] decrypt(byte[] content, byte[] keyByte, byte[] ivByte) throws Exception {
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initialize();
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Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");
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Key sKeySpec = new SecretKeySpec(keyByte, "AES");
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cipher.init(Cipher.DECRYPT_MODE, sKeySpec, generateIV(ivByte));// 初始化
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byte[] result = cipher.doFinal(content);
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return result;
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}
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public static void initialize(){
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if (initialized) return;
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Security.addProvider(new BouncyCastleProvider());
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initialized = true;
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}
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//生成iv
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public static AlgorithmParameters generateIV(byte[] iv) throws Exception{
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AlgorithmParameters params = AlgorithmParameters.getInstance("AES");
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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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