微信小程序解密

建议使用1.6及以上的环境

使用maven下载jar包

org.bouncycastle 
bcprov-jdk15on 
1.55

加密类代码

import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.util.Arrays;
import javax.crypto.Cipher;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.Security;
/**
* Created by wind on 2016/12/24.
*/
/**
*
* @author ngh
* AES128 算法
*
* CBC 模式
*
* PKCS7Padding 填充模式
*
* CBC模式需要添加一个参数iv--对称解密算法初始向量 iv
*
* 介于java 不支持PKCS7Padding,只支持PKCS5Padding 但是PKCS7Padding 和 PKCS5Padding 没有什么区别
* 要实现在java端用PKCS7Padding填充,需要用到bouncycastle组件来实现
*/
public class Pkcs7Encoder {
// 算法名称
static final String KEY_ALGORITHM = "AES";
// 加解密算法/模式/填充方式
static final String algorithmStr = "AES/CBC/PKCS7Padding";
private static Key key;
private static Cipher cipher;
boolean isInited = false;
//默认对称解密算法初始向量 iv
static byte[] iv = { 0x30, 0x31, 0x30, 0x32, 0x30, 0x33, 0x30, 0x34, 0x30, 0x35, 0x30, 0x36, 0x30, 0x37, 0x30, 0x38 };
public static void init(byte[] keyBytes) {
// 如果密钥不足16位,那么就补足. 这个if 中的内容很重要
int base = 16;
if (keyBytes.length % base != 0) {
int groups = keyBytes.length / base + (keyBytes.length % base != 0 ? 1 : 0);
byte[] temp = new byte[groups * base];
Arrays.fill(temp, (byte) 0);
System.arraycopy(keyBytes, 0, temp, 0, keyBytes.length);
keyBytes = temp;
}
// 初始化
Security.addProvider(new BouncyCastleProvider());
// 转化成JAVA的密钥格式
key = new SecretKeySpec(keyBytes, KEY_ALGORITHM);
try {
// 初始化cipher
cipher = Cipher.getInstance(algorithmStr, "BC");
} catch (NoSuchAlgorithmException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchPaddingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchProviderException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* 加密方法
* --使用默认iv时
* @param content
* 要加密的字符串
* @param keyBytes
* 加密密钥
* @return
*/
public static byte[] encrypt(byte[] content, byte[] keyBytes) {
byte[] encryptedText = encryptOfDiyIV(content,keyBytes,iv);
return encryptedText;
} /**
* 解密方法
* --使用默认iv时
* @param encryptedData
* 要解密的字符串
* @param keyBytes
* 解密密钥
* @return
*/
public static byte[] decrypt(byte[] encryptedData, byte[] keyBytes) {
byte[] encryptedText = decryptOfDiyIV(encryptedData,keyBytes,iv);
return encryptedText;
}
/**
* 加密方法
* ---自定义对称解密算法初始向量 iv
* @param content
* 要加密的字符串
* @param keyBytes
* 加密密钥
* @param ivs
* 自定义对称解密算法初始向量 iv
* @return 加密的结果
*/
public static byte[] encryptOfDiyIV(byte[] content, byte[] keyBytes, byte[] ivs) {
byte[] encryptedText = null;
init(keyBytes);
System.out.println("IV:" + new String(ivs));
try {
cipher.init(Cipher.ENCRYPT_MODE, key, new IvParameterSpec(ivs));
encryptedText = cipher.doFinal(content);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return encryptedText;
}
/**
* 解密方法
*
* @param encryptedData
* 要解密的字符串
* @param keyBytes
* 解密密钥
* @param ivs
* 自定义对称解密算法初始向量 iv
* @return
*/
public static byte[] decryptOfDiyIV(byte[] encryptedData, byte[] keyBytes,byte[] ivs) {
byte[] encryptedText = null;
init(keyBytes);
System.out.println("IV:" + new String(ivs));
try {
cipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(ivs));
encryptedText = cipher.doFinal(encryptedData);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return encryptedText;
}
}

测试类

public class Test {
public static void main(String[] args) throws Exception { String encryptedData = "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";
String iv="r7BXXKkLb8qrSNn05n0qiA==";
String sessionKey = "tiihtNczf5v6AKRyjwEUhQ==";
toStr(sessionKey,encryptedData,iv);
}
private static void toStr(String sessionKey,String encryptedData ,String iv) throws Exception{
byte[] sessionKeyBy = BASE64.decryptBASE64(sessionKey.getBytes());
byte[] encryptedDataBy = BASE64.decryptBASE64(encryptedData.getBytes());
byte[] ivBy = BASE64.decryptBASE64(iv.getBytes());
byte[] dec = Pkcs7Encoder.decryptOfDiyIV(encryptedDataBy, sessionKeyBy,ivBy);
System.out.println(new String(dec));
}
} 
测试类中的Base64 带测试方法 
import org.apache.commons.codec.binary.Base64;
/** * BASE64加密解密 */ public class BASE64 { /** * BASE64解密 * @param key * @return * @throws Exception */ public static byte[] decryptBASE64(byte[] key) throws Exception { return (new Base64()).decode(key); } /** * BASE64加密 * @param key * @return * @throws Exception */ public static byte[] encryptBASE64(byte[] key) throws Exception { return (new Base64()).encode(key); } public static void main(String[] args) throws Exception { byte[] data = BASE64.encryptBASE64("http://aub.iteye.com/".getBytes()); System.out.println("加密前:" + new String(data)); byte[] byteArray = BASE64.decryptBASE64(data); System.out.println("解密后:" + new String(byteArray)); } } 完成

会出现的一些错误:

cannot load mian class

打包成jar包以后,在正式运行执行:java bcprov-jdk150on-1.55.jar之前,需要删除 .jar包中的一个文件:META-INF/BCKEY.DSA

no such provider: BC 
在jdk中的jre/lib/security修改java.security文件, security.provider.6=com.sun.security.sasl.Provider 下面添加 security.provider.7=org.bouncycastle.jce.provider.BouncyCastleProvider
在/jre/lib/ext中添加bcprov-jdk15-135.jar的jar包
bcprov-jdk16-143.jar提供加密,解密,生成密钥对等方法 
下载网址:http://download.csdn.net/download/tomliguocai/3945936

文章大部分代码来自http://windcoder.com/jinjiweixinxiaochengxu-javabanaescbcpkcs7paddingjiajiemizifuchuan/