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2018.05.24 解密微信退款结果通知中的加密信息req_i

2018.05.24 解密微信退款结果通知中的加密信息req_i

作者: 薛定谔的猴子 | 来源:发表于2018-05-24 17:04 被阅读1772次

在微信返回的退款结果通知中,包含了一个加密信息字段req_info


微信支付文档中有提及到如何解密:


现在我们就一步一步解密得到返回的字段信息:

前提工作:

1、添加maven依赖

        <dependency>  
            <groupId>org.bouncycastle</groupId>  
            <artifactId>bcprov-jdk15on</artifactId>  
            <version>1.47</version>  
        </dependency>  

2、替换jar包
JAVA运行环境默认不允许256位密钥的AES加解密,解决方法就是修改策略文件

在官方网站下载JCE无限制权限策略文件

JDK7版本JCE下载地址: http://www.oracle.com/technetwork/java/javase/downloads/jce-7-download-432124.html

JDK8版本JCE下载地址:http://www.oracle.com/technetwork/java/javase/downloads/jce8-download-2133166.html

  • 下载后解压,可以看到local_policy.jar和US_export_policy.jar以及readme.txt
  • 如果安装了JRE,将两个jar文件放到%JRE_HOME%\lib\security目录下覆盖原来的文件
  • 如果安装了JDK,将两个jar文件放到%JDK_HOME%\jre\lib\security目录下覆盖原来文件

实践:
以JDK8为例,系统为WIN10,替换上述security文件夹下\policy\limited文件夹和\policy\unlimited文件夹里面的local_policy.jar和US_export_policy.jar这两个文件。

若是在服务器上,则只有在security目录下有local_policy.jar和US_export_policy.jar,替换即可

开始解密:

1、用到的工具类Base64Util.java 和 MD5Util.java

  • Base64Util
import java.io.IOException;
import java.io.OutputStream;
import java.io.Writer;

public class Base64Util {

    private static final char S_BASE64CHAR[] = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S',
            'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't',
            'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'};
    private static final byte S_DECODETABLE[];

    static {
        S_DECODETABLE = new byte[128];
        for (int i = 0; i < S_DECODETABLE.length; i++)
            S_DECODETABLE[i] = 127;

        for (int i = 0; i < S_BASE64CHAR.length; i++)
            S_DECODETABLE[S_BASE64CHAR[i]] = (byte) i;

    }

    /**
     * @param ibuf
     * @param obuf
     * @param wp
     * @return
     */
    private static int decode0(char ibuf[], byte obuf[], int wp) {
        int outlen = 3;
        if (ibuf[3] == '=')
            outlen = 2;
        if (ibuf[2] == '=')
            outlen = 1;
        int b0 = S_DECODETABLE[ibuf[0]];
        int b1 = S_DECODETABLE[ibuf[1]];
        int b2 = S_DECODETABLE[ibuf[2]];
        int b3 = S_DECODETABLE[ibuf[3]];
        switch (outlen) {
            case 1: // '\001'
                obuf[wp] = (byte) (b0 << 2 & 252 | b1 >> 4 & 3);
                return 1;

            case 2: // '\002'
                obuf[wp++] = (byte) (b0 << 2 & 252 | b1 >> 4 & 3);
                obuf[wp] = (byte) (b1 << 4 & 240 | b2 >> 2 & 15);
                return 2;

            case 3: // '\003'
                obuf[wp++] = (byte) (b0 << 2 & 252 | b1 >> 4 & 3);
                obuf[wp++] = (byte) (b1 << 4 & 240 | b2 >> 2 & 15);
                obuf[wp] = (byte) (b2 << 6 & 192 | b3 & 63);
                return 3;
        }
        throw new RuntimeException("Internal error");
    }

    /**
     * @param data
     * @param off
     * @param len
     * @return
     */
    public static byte[] decode(char data[], int off, int len) {
        char ibuf[] = new char[4];
        int ibufcount = 0;
        byte obuf[] = new byte[(len / 4) * 3 + 3];
        int obufcount = 0;
        for (int i = off; i < off + len; i++) {
            char ch = data[i];
            if (ch != '=' && (ch >= S_DECODETABLE.length || S_DECODETABLE[ch] == 127))
                continue;
            ibuf[ibufcount++] = ch;
            if (ibufcount == ibuf.length) {
                ibufcount = 0;
                obufcount += decode0(ibuf, obuf, obufcount);
            }
        }

        if (obufcount == obuf.length) {
            return obuf;
        } else {
            byte ret[] = new byte[obufcount];
            System.arraycopy(obuf, 0, ret, 0, obufcount);
            return ret;
        }
    }

    /**
     * @param data
     * @return
     */
    public static byte[] decode(String data) {
        char ibuf[] = new char[4];
        int ibufcount = 0;
        byte obuf[] = new byte[(data.length() / 4) * 3 + 3];
        int obufcount = 0;
        for (int i = 0; i < data.length(); i++) {
            char ch = data.charAt(i);
            if (ch != '=' && (ch >= S_DECODETABLE.length || S_DECODETABLE[ch] == 127))
                continue;
            ibuf[ibufcount++] = ch;
            if (ibufcount == ibuf.length) {
                ibufcount = 0;
                obufcount += decode0(ibuf, obuf, obufcount);
            }
        }

        if (obufcount == obuf.length) {
            return obuf;
        } else {
            byte ret[] = new byte[obufcount];
            System.arraycopy(obuf, 0, ret, 0, obufcount);
            return ret;
        }
    }

    /**
     * @param data
     * @param off
     * @param len
     * @param ostream
     * @throws IOException
     */
    public static void decode(char data[], int off, int len, OutputStream ostream) throws IOException {
        char ibuf[] = new char[4];
        int ibufcount = 0;
        byte obuf[] = new byte[3];
        for (int i = off; i < off + len; i++) {
            char ch = data[i];
            if (ch != '=' && (ch >= S_DECODETABLE.length || S_DECODETABLE[ch] == 127))
                continue;
            ibuf[ibufcount++] = ch;
            if (ibufcount == ibuf.length) {
                ibufcount = 0;
                int obufcount = decode0(ibuf, obuf, 0);
                ostream.write(obuf, 0, obufcount);
            }
        }

    }

    /**
     * @param data
     * @param ostream
     * @throws IOException
     */
    public static void decode(String data, OutputStream ostream) throws IOException {
        char ibuf[] = new char[4];
        int ibufcount = 0;
        byte obuf[] = new byte[3];
        for (int i = 0; i < data.length(); i++) {
            char ch = data.charAt(i);
            if (ch != '=' && (ch >= S_DECODETABLE.length || S_DECODETABLE[ch] == 127))
                continue;
            ibuf[ibufcount++] = ch;
            if (ibufcount == ibuf.length) {
                ibufcount = 0;
                int obufcount = decode0(ibuf, obuf, 0);
                ostream.write(obuf, 0, obufcount);
            }
        }

    }

    /**
     * @param data
     * @return
     */
    public static String encode(byte data[]) {
        return encode(data, 0, data.length);
    }

    /**
     * @param data
     * @param off
     * @param len
     * @return
     */
    public static String encode(byte data[], int off, int len) {
        if (len <= 0)
            return "";
        char out[] = new char[(len / 3) * 4 + 4];
        int rindex = off;
        int windex = 0;
        int rest;
        for (rest = len - off; rest >= 3; rest -= 3) {
            int i = ((data[rindex] & 255) << 16) + ((data[rindex + 1] & 255) << 8) + (data[rindex + 2] & 255);
            out[windex++] = S_BASE64CHAR[i >> 18];
            out[windex++] = S_BASE64CHAR[i >> 12 & 63];
            out[windex++] = S_BASE64CHAR[i >> 6 & 63];
            out[windex++] = S_BASE64CHAR[i & 63];
            rindex += 3;
        }

        if (rest == 1) {
            int i = data[rindex] & 255;
            out[windex++] = S_BASE64CHAR[i >> 2];
            out[windex++] = S_BASE64CHAR[i << 4 & 63];
            out[windex++] = '=';
            out[windex++] = '=';
        } else if (rest == 2) {
            int i = ((data[rindex] & 255) << 8) + (data[rindex + 1] & 255);
            out[windex++] = S_BASE64CHAR[i >> 10];
            out[windex++] = S_BASE64CHAR[i >> 4 & 63];
            out[windex++] = S_BASE64CHAR[i << 2 & 63];
            out[windex++] = '=';
        }
        return new String(out, 0, windex);
    }

    /**
     * @param data
     * @param off
     * @param len
     * @param ostream
     * @throws IOException
     */
    public static void encode(byte data[], int off, int len, OutputStream ostream) throws IOException {
        if (len <= 0)
            return;
        byte out[] = new byte[4];
        int rindex = off;
        int rest;
        for (rest = len - off; rest >= 3; rest -= 3) {
            int i = ((data[rindex] & 255) << 16) + ((data[rindex + 1] & 255) << 8) + (data[rindex + 2] & 255);
            out[0] = (byte) S_BASE64CHAR[i >> 18];
            out[1] = (byte) S_BASE64CHAR[i >> 12 & 63];
            out[2] = (byte) S_BASE64CHAR[i >> 6 & 63];
            out[3] = (byte) S_BASE64CHAR[i & 63];
            ostream.write(out, 0, 4);
            rindex += 3;
        }

        if (rest == 1) {
            int i = data[rindex] & 255;
            out[0] = (byte) S_BASE64CHAR[i >> 2];
            out[1] = (byte) S_BASE64CHAR[i << 4 & 63];
            out[2] = 61;
            out[3] = 61;
            ostream.write(out, 0, 4);
        } else if (rest == 2) {
            int i = ((data[rindex] & 255) << 8) + (data[rindex + 1] & 255);
            out[0] = (byte) S_BASE64CHAR[i >> 10];
            out[1] = (byte) S_BASE64CHAR[i >> 4 & 63];
            out[2] = (byte) S_BASE64CHAR[i << 2 & 63];
            out[3] = 61;
            ostream.write(out, 0, 4);
        }
    }

    /**
     * @param data
     * @param off
     * @param len
     * @param writer
     * @throws IOException
     */
    public static void encode(byte data[], int off, int len, Writer writer) throws IOException {
        if (len <= 0)
            return;
        char out[] = new char[4];
        int rindex = off;
        int rest = len - off;
        int output = 0;
        do {
            if (rest < 3)
                break;
            int i = ((data[rindex] & 255) << 16) + ((data[rindex + 1] & 255) << 8) + (data[rindex + 2] & 255);
            out[0] = S_BASE64CHAR[i >> 18];
            out[1] = S_BASE64CHAR[i >> 12 & 63];
            out[2] = S_BASE64CHAR[i >> 6 & 63];
            out[3] = S_BASE64CHAR[i & 63];
            writer.write(out, 0, 4);
            rindex += 3;
            rest -= 3;
            if ((output += 4) % 76 == 0)
                writer.write("\n");
        }
        while (true);
        if (rest == 1) {
            int i = data[rindex] & 255;
            out[0] = S_BASE64CHAR[i >> 2];
            out[1] = S_BASE64CHAR[i << 4 & 63];
            out[2] = '=';
            out[3] = '=';
            writer.write(out, 0, 4);
        } else if (rest == 2) {
            int i = ((data[rindex] & 255) << 8) + (data[rindex + 1] & 255);
            out[0] = S_BASE64CHAR[i >> 10];
            out[1] = S_BASE64CHAR[i >> 4 & 63];
            out[2] = S_BASE64CHAR[i << 2 & 63];
            out[3] = '=';
            writer.write(out, 0, 4);
        }
    }

}
  • MD5Util
import java.security.MessageDigest;

public class MD5Util {
    public final static String MD5(String s) {
        char hexDigits[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
        try {
            byte[] btInput = s.getBytes();
            // 获得MD5摘要算法的 MessageDigest 对象
            MessageDigest mdInst = MessageDigest.getInstance("MD5");
            // 使用指定的字节更新摘要
            mdInst.update(btInput);
            // 获得密文
            byte[] md = mdInst.digest();
            // 把密文转换成十六进制的字符串形式
            int j = md.length;
            char str[] = new char[j * 2];
            int k = 0;
            for (int i = 0; i < j; i++) {
                byte byte0 = md[i];
                str[k++] = hexDigits[byte0 >>> 4 & 0xf];
                str[k++] = hexDigits[byte0 & 0xf];
            }
            return new String(str);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    private static String byteArrayToHexString(byte b[]) {
        StringBuffer resultSb = new StringBuffer();
        for (int i = 0; i < b.length; i++)
            resultSb.append(byteToHexString(b[i]));

        return resultSb.toString();
    }

    private static String byteToHexString(byte b) {
        int n = b;
        if (n < 0)
            n += 256;
        int d1 = n / 16;
        int d2 = n % 16;
        return hexDigits[d1] + hexDigits[d2];
    }

    public static String MD5Encode(String origin, String charsetname) {
        String resultString = null;
        try {
            resultString = new String(origin);
            MessageDigest md = MessageDigest.getInstance("MD5");
            if (charsetname == null || "".equals(charsetname))
                resultString = byteArrayToHexString(md.digest(resultString.getBytes()));
            else
                resultString = byteArrayToHexString(md.digest(resultString.getBytes(charsetname)));
        } catch (Exception exception) {
        }
        return resultString;
    }

    private static final String hexDigits[] = {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"};

}

2、解密

import org.bouncycastle.jce.provider.BouncyCastleProvider;

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import java.security.Security;

public class AESUtil {

    private static Prop prop = DataDictionary.getProp();

    /**
     * 密钥算法
     */
    private static final String ALGORITHM = "AES";
    /**
     * 加解密算法/工作模式/填充方式
     */
    private static final String ALGORITHM_MODE_PADDING = "AES/ECB/PKCS7Padding";
    /**
     * 生成key
     */
    //微信支付API密钥设置路径:微信商户平台(pay.weixin.qq.com)-->账户设置-->API安全-->密钥设置
    private static String paySign = "微信支付API密钥";
    //对商户key做md5,得到32位小写key*
    private static SecretKeySpec key = new SecretKeySpec(MD5Util.MD5Encode(paySign, "UTF-8").toLowerCase().getBytes(), ALGORITHM);

    static {

    }

    /**
     * AES加密
     *
     * @param data
     * @return
     * @throws Exception
     */
    public static String encryptData(String data) throws Exception {
        Security.addProvider(new BouncyCastleProvider());
        // 创建密码器
        Cipher cipher = Cipher.getInstance(ALGORITHM_MODE_PADDING, "BC");
        // 初始化
        cipher.init(Cipher.ENCRYPT_MODE, key);
        return Base64Util.encode(cipher.doFinal(data.getBytes()));
    }

    /**
     * AES解密
     *
     *(1)对加密串A做base64解码,得到加密串B
     *(2)用key*对加密串B做AES-256-ECB解密(PKCS7Padding)
     * @param base64Data
     * @return
     * @throws Exception
     */
    public static String decryptData(String base64Data) throws Exception {
        Security.addProvider(new BouncyCastleProvider());
        Cipher cipher = Cipher.getInstance(ALGORITHM_MODE_PADDING, "BC");
        cipher.init(Cipher.DECRYPT_MODE, key);
        return new String(cipher.doFinal(Base64Util.decode(base64Data)));
    }

    public static void main(String[] args) throws Exception {
        String A = "微信返回的加密信息req_info";
        System.out.println(AESUtil.decryptData(A));
    }

至此就解密完毕啦,返回的的xml结构的数据,包含微信退款单号等数据,之后就可以自由处理啦!

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