WxMiniAES128Util.java
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package org.theyeasy.weixin.util;
import org.apache.commons.codec.binary.Base64;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.io.UnsupportedEncodingException;
import java.security.*;
import java.security.spec.InvalidParameterSpecException;
import java.security.AlgorithmParameters;
import java.security.Key;
import java.security.Security;
import org.bouncycastle.jce.provider.symmetric.ARC4.Base;
import org.bouncycastle.util.*;
/*微信小程序的解密算法*/
public class WxMiniAES128Util {
// 算法名
public static final String KEY_NAME = "AES";
// 加解密算法/模式/填充方式
// 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
public static final String CIPHER_ALGORITHM = "AES/CBC/PKCS7Padding";
static {
//BouncyCastle是一个开源的加解密解决方案，主页在http://www.bouncycastle.org/
Security.addProvider(new BouncyCastleProvider());
}
/**
* 微信 数据解密<br/>
* 对称解密使用的算法为 AES-128-CBC，数据采用PKCS#7填充<br/>
* 对称解密的目标密文:encrypted=Base64_Decode(encryptData)<br/>
* 对称解密秘钥:key = Base64_Decode(session_key),aeskey是16字节<br/>
* 对称解密算法初始向量:iv = Base64_Decode(iv),同样是16字节<br/>
*
* @param encrypted 目标密文
* @param session_key 会话ID
* @param iv 加密算法的初始向量
*/
public static String wxDecrypt(String encrypted, String session_key, String iv) {
String json = null;
byte[] encrypted64 = Base64.decodeBase64(encrypted.getBytes());
byte[] key64 = Base64.decodeBase64(session_key.getBytes());
byte[] iv64 = Base64.decodeBase64(iv.getBytes());
byte[] data;
try {
init();
json = new String(decrypt(encrypted64, key64, generateIV(iv64)));
} catch (Exception e) {
e.printStackTrace();
}
return json;
}
/**
* 初始化密钥
*/
public static void init() throws Exception {
Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
KeyGenerator.getInstance(KEY_NAME).init(128);
}
/**
* 生成iv
*/
public static AlgorithmParameters generateIV(byte[] iv) throws Exception {
// 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
// Arrays.fill(iv, (byte) 0x00);
AlgorithmParameters params = AlgorithmParameters.getInstance(KEY_NAME);
params.init(new IvParameterSpec(iv));
return params;
}
/**
* 生成解密
*/
public static byte[] decrypt(byte[] encryptedData, byte[] keyBytes, AlgorithmParameters iv)
throws Exception {
Key key = new SecretKeySpec(keyBytes, KEY_NAME);
Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
// 设置为解密模式
cipher.init(Cipher.DECRYPT_MODE, key, iv);
return cipher.doFinal(encryptedData);
}
public static void main(String[] args) {
// 微信demo中的测试数据
String encrypted = "CiyLU1Aw2KjvrjMdj8YKliAjtP4gsMZM" + "QmRzooG2xrDcvSnxIMXFufNstNGTyaGS" + "9uT5geRa0W4oTOb1WT7fJlAC+oNPdbB+" + "3hVbJSRgv+4lGOETKUQz6OYStslQ142d" + "NCuabNPGBzlooOmB231qMM85d2/fV6Ch" + "evvXvQP8Hkue1poOFtnEtpyxVLW1zAo6" + "/1Xx1COxFvrc2d7UL/lmHInNlxuacJXw" + "u0fjpXfz/YqYzBIBzD6WUfTIF9GRHpOn" + "/Hz7saL8xz+W//FRAUid1OksQaQx4CMs" + "8LOddcQhULW4ucetDf96JcR3g0gfRK4P" + "C7E/r7Z6xNrXd2UIeorGj5Ef7b1pJAYB" + "6Y5anaHqZ9J6nKEBvB4DnNLIVWSgARns" + "/8wR2SiRS7MNACwTyrGvt9ts8p12PKFd" + "lqYTopNHR1Vf7XjfhQlVsAJdNiKdYmYV" + "oKlaRv85IfVunYzO0IKXsyl7JCUjCpoG" + "20f0a04COwfneQAGGwd5oa+T8yO5hzuy" + "Db/XcxxmK01EpqOyuxINew==";
String session_key = "tiihtNczf5v6AKRyjwEUhQ==";
String iv = "r7BXXKkLb8qrSNn05n0qiA==";
String json = wxDecrypt(encrypted, session_key, iv);
System.out.println(json);
}
}