java微信小程序解密AES/CBC/PKCS7Padding

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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

  <!-- https://mvnrepository.com/artifact/org.bouncycastle/bcprov-jdk15on -->    <dependency>      <groupId>org.bouncycastle</groupId>      <artifactId>bcprov-jdk15on</artifactId>      <version>1.55</version>    </dependency>

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/

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