[Python知识库]一个脚本让你的app自动吐出密钥信息

### 背景
火线某个私密项目中涉及到一个app的测试，打开一看，证书校验–不让抓包，信息加密-无法篡改，遇到这种情况怎么，正常我这种小菜鸡都是直接放弃了，奈何厂家奖金给的高啊，我还是得想办法搞一搞，虽然到最后低危都没有捡到一个，但是还是分享给没有做过app的大佬参考一下。
###一、 frida安装

1.Frida概述

Frida是一款轻量级HOOK框架，可用于多平台上，例如android、windows、ios等。
??frida分为两部分，服务端运行在目标机上，通过注入进程的方式来实现劫持应用函数，另一部分运行在系统机器上。
??frida上层接口支持js、python、c等。
??Frida官方github地址为： frida官方地址

2.Frida安装

1 、安装python3.7并配置好环境变量（官方推荐python3以上版本至少为3.7），python安装包官方下载地址：https://www.python.org/downloads/。
????2 、安装frida模块，命令为pip install frida(配置了多个python版本环境的可以使用命令python -m pip install frida防止用pip install frida命令报错)。

3、安装frida-tools模块，命令同上，pip install frida-tools或者python -m pip install frida-tools。

4、下载运行在目标机上的frida-sever端，官方下载地址：https://github.com/frida/frida/releases后面可以跟版本14.2.2，下载时要选择对应的版本下载，例如我的机器为arm32为架构，就选择frida-server-14.2.2-android-arm.xz下载。（可以在adb使用命令cat /proc/cpuinfo查询）

5、将第四步下载好的文件解压，然后通过命令adb push 你的电脑是存放位置 /data/local/tmp将文件传输到手机中，然后通过adb shell进入手机端，给文件赋权777，并于root权限启动。

6、做完以上几步后，新开一个命令行输入命令frida-ps -U查看手机进程，如果出现以下结果，则frida安装成功。

可以看到进程了
### 二、使用Frida脚本绕过抓包限制
设置burp证书
先在burp里设置本机代理
访问代理地址并下载burp证书
将下载的burp证书导入到手机中/data/local/tmp目录下，并重命名为cert-der.crt（此名称在接下来的fridascript.js脚本中使用，如果该名字命名为其他则脚本中相对应的地方也需要进行替换）
adb push cacert.der /data/local/tmp/cert-der.crt
模拟器设置代理，在安卓手机设置->wlan选择对应网络设置代理
打开你想抓包的软件，使用frida-ps -U命令列出设备上运行的服务，找到对应的包名
在本地新建一个js文件，并将一下内容写入

/* 
   Android SSL Re-pinning frida script v0.2 030417-pier 

   $ adb push burpca-cert-der.crt /data/local/tmp/cert-der.crt
   $ frida -U -f it.app.mobile -l frida-android-repinning.js --no-pause

   https://techblog.mediaservice.net/2017/07/universal-android-ssl-pinning-bypass-with-frida/
   
   UPDATE 20191605: Fixed undeclared var. Thanks to @oleavr and @ehsanpc9999 !
*/

setTimeout(function(){
    Java.perform(function (){
    	console.log("");
	    console.log("[.] Cert Pinning Bypass/Re-Pinning");

	    var CertificateFactory = Java.use("java.security.cert.CertificateFactory");
	    var FileInputStream = Java.use("java.io.FileInputStream");
	    var BufferedInputStream = Java.use("java.io.BufferedInputStream");
	    var X509Certificate = Java.use("java.security.cert.X509Certificate");
	    var KeyStore = Java.use("java.security.KeyStore");
	    var TrustManagerFactory = Java.use("javax.net.ssl.TrustManagerFactory");
	    var SSLContext = Java.use("javax.net.ssl.SSLContext");

	    // Load CAs from an InputStream
	    console.log("[+] Loading our CA...")
	    var cf = CertificateFactory.getInstance("X.509");
	    
	    try {
	    	var fileInputStream = FileInputStream.$new("/data/local/tmp/cert-der.crt");
	    }
	    catch(err) {
	    	console.log("[o] " + err);
	    }
	    
	    var bufferedInputStream = BufferedInputStream.$new(fileInputStream);
	  	var ca = cf.generateCertificate(bufferedInputStream);
	    bufferedInputStream.close();

		var certInfo = Java.cast(ca, X509Certificate);
	    console.log("[o] Our CA Info: " + certInfo.getSubjectDN());

	    // Create a KeyStore containing our trusted CAs
	    console.log("[+] Creating a KeyStore for our CA...");
	    var keyStoreType = KeyStore.getDefaultType();
	    var keyStore = KeyStore.getInstance(keyStoreType);
	    keyStore.load(null, null);
	    keyStore.setCertificateEntry("ca", ca);
	    
	    // Create a TrustManager that trusts the CAs in our KeyStore
	    console.log("[+] Creating a TrustManager that trusts the CA in our KeyStore...");
	    var tmfAlgorithm = TrustManagerFactory.getDefaultAlgorithm();
	    var tmf = TrustManagerFactory.getInstance(tmfAlgorithm);
	    tmf.init(keyStore);
	    console.log("[+] Our TrustManager is ready...");

	    console.log("[+] Hijacking SSLContext methods now...")
	    console.log("[-] Waiting for the app to invoke SSLContext.init()...")

	   	SSLContext.init.overload("[Ljavax.net.ssl.KeyManager;", "[Ljavax.net.ssl.TrustManager;", "java.security.SecureRandom").implementation = function(a,b,c) {
	   		console.log("[o] App invoked javax.net.ssl.SSLContext.init...");
	   		SSLContext.init.overload("[Ljavax.net.ssl.KeyManager;", "[Ljavax.net.ssl.TrustManager;", "java.security.SecureRandom").call(this, a, tmf.getTrustManagers(), c);
	   		console.log("[+] SSLContext initialized with our custom TrustManager!");
	   	}
    });
},0);

脚本里的30行其中对应的就是burp证书的信息
将fridascript.js注入到目标应用程序中
frida -U -f com.xxxx.app.ui -l C:\Users\xxx\Desktop\fridascript.js --no-pause
-f选项表示强制启动一个应用程序，-l选项表示加载指定脚本，–no-pause选项表示不中断应用程序的启动，如下所示代表运行成功

咱们可以看到，已经能抓到包了

但是包的内容进行了加密
### 二、使用Frida脚本让他自己吐出密钥信息
还需要再本地建一个新的js文件，代码如下：

var N_ENCRYPT_MODE = 1
var N_DECRYPT_MODE = 2

function showStacks() {
    var Exception = Java.use("java.lang.Exception");
    var ins = Exception.$new("Exception");
    var straces = ins.getStackTrace();

    if (undefined == straces || null == straces) {
        return;
    }

    console.log("============================= Stack strat=======================");
    console.log("");

    for (var i = 0; i < straces.length; i++) {
        var str = "   " + straces[i].toString();
        console.log(str);
    }

    console.log("");
    console.log("============================= Stack end=======================\r\n");
    Exception.$dispose();
}

//工具相关函数 
var base64EncodeChars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/',
    base64DecodeChars = new Array((-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), 62, (-1), (-1), (-1), 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, (-1), (-1), (-1), (-1), (-1), (-1), (-1), 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, (-1), (-1), (-1), (-1), (-1), (-1), 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, (-1), (-1), (-1), (-1), (-1));

function stringToBase64(e) {
    var r, a, c, h, o, t;
    for (c = e.length, a = 0, r = ''; a < c;) {
        if (h = 255 & e.charCodeAt(a++), a == c) {
            r += base64EncodeChars.charAt(h >> 2),
                r += base64EncodeChars.charAt((3 & h) << 4),
                r += '==';
            break
        }
        if (o = e.charCodeAt(a++), a == c) {
            r += base64EncodeChars.charAt(h >> 2),
                r += base64EncodeChars.charAt((3 & h) << 4 | (240 & o) >> 4),
                r += base64EncodeChars.charAt((15 & o) << 2),
                r += '=';
            break
        }
        t = e.charCodeAt(a++),
            r += base64EncodeChars.charAt(h >> 2),
            r += base64EncodeChars.charAt((3 & h) << 4 | (240 & o) >> 4),
            r += base64EncodeChars.charAt((15 & o) << 2 | (192 & t) >> 6),
            r += base64EncodeChars.charAt(63 & t)
    }
    return r
}
function base64ToString(e) {
    var r, a, c, h, o, t, d;
    for (t = e.length, o = 0, d = ''; o < t;) {
        do
            r = base64DecodeChars[255 & e.charCodeAt(o++)];
        while (o < t && r == -1);
        if (r == -1)
            break;
        do
            a = base64DecodeChars[255 & e.charCodeAt(o++)];
        while (o < t && a == -1);
        if (a == -1)
            break;
        d += String.fromCharCode(r << 2 | (48 & a) >> 4);
        do {
            if (c = 255 & e.charCodeAt(o++), 61 == c)
                return d;
            c = base64DecodeChars[c]
        } while (o < t && c == -1);
        if (c == -1)
            break;
        d += String.fromCharCode((15 & a) << 4 | (60 & c) >> 2);
        do {
            if (h = 255 & e.charCodeAt(o++), 61 == h)
                return d;
            h = base64DecodeChars[h]
        } while (o < t && h == -1);
        if (h == -1)
            break;
        d += String.fromCharCode((3 & c) << 6 | h)
    }
    return d
}
function hexToBase64(str) {
    return base64Encode(String.fromCharCode.apply(null, str.replace(/\r|\n/g, "").replace(/([\da-fA-F]{2}) ?/g, "0x$1 ").replace(/ +$/, "").split(" ")));
}
function base64ToHex(str) {
    for (var i = 0, bin = base64Decode(str.replace(/[ \r\n]+$/, "")), hex = []; i < bin.length; ++i) {
        var tmp = bin.charCodeAt(i).toString(16);
        if (tmp.length === 1)
            tmp = "0" + tmp;
        hex[hex.length] = tmp;
    }
    return hex.join("");
}
function hexToBytes(str) {
    var pos = 0;
    var len = str.length;
    if (len % 2 != 0) {
        return null;
    }
    len /= 2;
    var hexA = new Array();
    for (var i = 0; i < len; i++) {
        var s = str.substr(pos, 2);
        var v = parseInt(s, 16);
        hexA.push(v);
        pos += 2;
    }
    return hexA;
}
function bytesToHex(arr) {
    var str = '';
    var k, j;
    for (var i = 0; i < arr.length; i++) {
        k = arr[i];
        j = k;
        if (k < 0) {
            j = k + 256;
        }
        if (j < 16) {
            str += "0";
        }
        str += j.toString(16);
    }
    return str;
}
function stringToHex(str) {
    var val = "";
    for (var i = 0; i < str.length; i++) {
        if (val == "")
            val = str.charCodeAt(i).toString(16);
        else
            val += str.charCodeAt(i).toString(16);
    }
    return val
}
function stringToBytes(str) {
    var ch, st, re = [];
    for (var i = 0; i < str.length; i++) {
        ch = str.charCodeAt(i);
        st = [];
        do {
            st.push(ch & 0xFF);
            ch = ch >> 8;
        }
        while (ch);
        re = re.concat(st.reverse());
    }
    return re;
}
//将byte[]转成String的方法
function bytesToString(arr) {
    var str = '';
    arr = new Uint8Array(arr);
    for (var i in arr) {
        str += String.fromCharCode(arr[i]);
    }
    return str;
}
function bytesToBase64(e) {
    var r, a, c, h, o, t;
    for (c = e.length, a = 0, r = ''; a < c;) {
        if (h = 255 & e[a++], a == c) {
            r += base64EncodeChars.charAt(h >> 2),
                r += base64EncodeChars.charAt((3 & h) << 4),
                r += '==';
            break
        }
        if (o = e[a++], a == c) {
            r += base64EncodeChars.charAt(h >> 2),
                r += base64EncodeChars.charAt((3 & h) << 4 | (240 & o) >> 4),
                r += base64EncodeChars.charAt((15 & o) << 2),
                r += '=';
            break
        }
        t = e[a++],
            r += base64EncodeChars.charAt(h >> 2),
            r += base64EncodeChars.charAt((3 & h) << 4 | (240 & o) >> 4),
            r += base64EncodeChars.charAt((15 & o) << 2 | (192 & t) >> 6),
            r += base64EncodeChars.charAt(63 & t)
    }
    return r
}
function base64ToBytes(e) {
    var r, a, c, h, o, t, d;
    for (t = e.length, o = 0, d = []; o < t;) {
        do
            r = base64DecodeChars[255 & e.charCodeAt(o++)];
        while (o < t && r == -1);
        if (r == -1)
            break;
        do
            a = base64DecodeChars[255 & e.charCodeAt(o++)];
        while (o < t && a == -1);
        if (a == -1)
            break;
        d.push(r << 2 | (48 & a) >> 4);
        do {
            if (c = 255 & e.charCodeAt(o++), 61 == c)
                return d;
            c = base64DecodeChars[c]
        } while (o < t && c == -1);
        if (c == -1)
            break;
        d.push((15 & a) << 4 | (60 & c) >> 2);
        do {
            if (h = 255 & e.charCodeAt(o++), 61 == h)
                return d;
            h = base64DecodeChars[h]
        } while (o < t && h == -1);
        if (h == -1)
            break;
        d.push((3 & c) << 6 | h)
    }
    return d
}
//stringToBase64 stringToHex stringToBytes
//base64ToString base64ToHex base64ToBytes
//               hexToBase64  hexToBytes    
// bytesToBase64 bytesToHex bytesToString

?
? Java.perform(function () {
? var secretKeySpec = Java.use(‘javax.crypto.spec.SecretKeySpec’);
? secretKeySpec.KaTeX parse error: Expected '}', got 'EOF' at end of input: … result = this.init(a, b);
? console.log("======================================");
? console.log(“算法名：” + b + “|str密钥:” + bytesToString(a));
? console.log(“算法名：” + b + “|Hex密钥:” + bytesToHex(a));
? return result;
? }
?

    var DESKeySpec = Java.use('javax.crypto.spec.DESKeySpec');
    DESKeySpec.$init.overload('[B').implementation = function (a) {
        showStacks();
        var result = this.$init(a);
        console.log("======================================");
        var bytes_key_des = this.getKey();
        console.log("des密钥  |str " + bytesToString(bytes_key_des));
        console.log("des密钥  |hex " + bytesToHex(bytes_key_des));
        return result;
    }

    DESKeySpec.$init.overload('[B', 'int').implementation = function (a, b) {
        showStacks();
        var result = this.$init(a, b);
        console.log("======================================");
        var bytes_key_des = this.getKey();
        console.log("des密钥  |str " + bytesToString(bytes_key_des));
        console.log("des密钥  |hex " + bytesToHex(bytes_key_des));
        return result;
    }

    var mac = Java.use('javax.crypto.Mac');
    mac.getInstance.overload('java.lang.String').implementation = function (a) {
        showStacks();
        var result = this.getInstance(a);
        console.log("======================================");
        console.log("算法名：" + a);
        return result;
    }
    mac.update.overload('[B').implementation = function (a) {
        //showStacks();
        this.update(a);
        console.log("======================================");
        console.log("update:" + bytesToString(a))
    }
    mac.update.overload('[B', 'int', 'int').implementation = function (a, b, c) {
        //showStacks();
        this.update(a, b, c)
        console.log("======================================");
        console.log("update:" + bytesToString(a) + "|" + b + "|" + c);
    }
    mac.doFinal.overload().implementation = function () {
        //showStacks();
        var result = this.doFinal();
        console.log("======================================");
        console.log("doFinal结果: |str  :"     + bytesToString(result));
        console.log("doFinal结果: |hex  :"     + bytesToHex(result));
        console.log("doFinal结果: |base64  :"  + bytesToBase64(result));
        return result;
    }
    mac.doFinal.overload('[B').implementation = function (a) {
        //showStacks();
        var result = this.doFinal(a);
        console.log("======================================");
        console.log("doFinal参数: |str  :"     + bytesToString(a));
        console.log("doFinal参数: |hex  :"     + bytesToHex(a));
        console.log("doFinal结果: |str  :"     + bytesToString(result));
        console.log("doFinal结果: |hex  :"     + bytesToHex(result));
        console.log("doFinal结果: |base64  :"  + bytesToBase64(result));
        return result;
    }

    var md = Java.use('java.security.MessageDigest');
    md.getInstance.overload('java.lang.String', 'java.lang.String').implementation = function (a, b) {
        //showStacks();
        console.log("======================================");
        console.log("算法名：" + a);
        return this.getInstance(a, b);
    }
    md.getInstance.overload('java.lang.String').implementation = function (a) {
        //showStacks();
        console.log("======================================");
        console.log("算法名：" + a);
        return this.getInstance(a);
    }
    md.update.overload('[B').implementation = function (a) {
        //showStacks();
        console.log("======================================");
        console.log("update:" + bytesToString(a))
        return this.update(a);
    }
    md.update.overload('[B', 'int', 'int').implementation = function (a, b, c) {
        //showStacks();
        console.log("======================================");
        console.log("update:" + bytesToString(a) + "|" + b + "|" + c);
        return this.update(a, b, c);
    }
    md.digest.overload().implementation = function () {
        //showStacks();
        console.log("======================================");
        var result = this.digest();
        console.log("digest结果 |hex:" + bytesToHex(result));
        console.log("digest结果 |base64:" + bytesToBase64(result));
        return result;
    }
    md.digest.overload('[B').implementation = function (a) {
        //showStacks();
        console.log("======================================");
        console.log("digest参数 |str:" + bytesToString(a));
        console.log("digest参数 |hex:" + bytesToHex(a));
        var result = this.digest(a);
        console.log("digest结果: |hex" + bytesToHex(result));
        console.log("digest结果: |base64" + bytesToBase64(result));
        return result;
    }

    var ivParameterSpec = Java.use('javax.crypto.spec.IvParameterSpec');
    ivParameterSpec.$init.overload('[B').implementation = function (a) {
        //showStacks();
        var result = this.$init(a);
        console.log("======================================");
        console.log("iv向量: |str:" + bytesToString(a));
        console.log("iv向量: |hex:" + bytesToHex(a));
        return result;
    }

    var cipher = Java.use('javax.crypto.Cipher');
    cipher.getInstance.overload('java.lang.String').implementation = function (a) {
        //showStacks();
        var result = this.getInstance(a);
        console.log("======================================");
        console.log("模式填充:" + a);
        return result;
    }
    cipher.init.overload('int', 'java.security.Key').implementation = function (a, b) {
        //showStacks();
        var result = this.init(a, b);
        console.log("======================================");
        if (N_ENCRYPT_MODE == a) 
        {
            console.log("init  | 加密模式");    
        }
        else if(N_DECRYPT_MODE == a)
        {
            console.log("init  | 解密模式");    
        }

        var bytes_key = b.getEncoded();
        console.log("init key:" + "|str密钥:" + bytesToString(bytes_key));
        console.log("init key:" + "|Hex密钥:" + bytesToHex(bytes_key));
        return result;
    }
    cipher.init.overload('int', 'java.security.cert.Certificate').implementation = function (a, b) {
        //showStacks();
        var result = this.init(a, b);
        console.log("======================================");
        
        if (N_ENCRYPT_MODE == a) 
        {
            console.log("init  | 加密模式");    
        }
        else if(N_DECRYPT_MODE == a)
        {
            console.log("init  | 解密模式");    
        }

        return result;
    }
    cipher.init.overload('int', 'java.security.Key', 'java.security.spec.AlgorithmParameterSpec').implementation = function (a, b, c) {
        //showStacks();
        var result = this.init(a, b, c);
        console.log("======================================");
        
        if (N_ENCRYPT_MODE == a) 
        {
            console.log("init  | 加密模式");    
        }
        else if(N_DECRYPT_MODE == a)
        {
            console.log("init  | 解密模式");    
        }
     
        var bytes_key = b.getEncoded();
        console.log("init key:" + "|str密钥:" + bytesToString(bytes_key));
        console.log("init key:" + "|Hex密钥:" + bytesToHex(bytes_key));

        return result;
    }
    cipher.init.overload('int', 'java.security.cert.Certificate', 'java.security.SecureRandom').implementation = function (a, b, c) {
        //showStacks();
        var result = this.init(a, b, c);
        if (N_ENCRYPT_MODE == a) 
        {
            console.log("init  | 加密模式");    
        }
        else if(N_DECRYPT_MODE == a)
        {
            console.log("init  | 解密模式");    
        }
        return result;
    }
    cipher.init.overload('int', 'java.security.Key', 'java.security.SecureRandom').implementation = function (a, b, c) {
        //showStacks();
        var result = this.init(a, b, c);
        if (N_ENCRYPT_MODE == a) 
        {
            console.log("init  | 加密模式");    
        }
        else if(N_DECRYPT_MODE == a)
        {
            console.log("init  | 解密模式");    
        }

         var bytes_key = b.getEncoded();
        console.log("init key:" + "|str密钥:" + bytesToString(bytes_key));
        console.log("init key:" + "|Hex密钥:" + bytesToHex(bytes_key));
        return result;
    }
    cipher.init.overload('int', 'java.security.Key', 'java.security.AlgorithmParameters').implementation = function (a, b, c) {
        //showStacks();
        var result = this.init(a, b, c);
        if (N_ENCRYPT_MODE == a) 
        {
            console.log("init  | 加密模式");    
        }
        else if(N_DECRYPT_MODE == a)
        {
            console.log("init  | 解密模式");    
        }

        var bytes_key = b.getEncoded();
        console.log("init key:" + "|str密钥:" + bytesToString(bytes_key));
        console.log("init key:" + "|Hex密钥:" + bytesToHex(bytes_key));
        return result;
    }
    cipher.init.overload('int', 'java.security.Key', 'java.security.AlgorithmParameters', 'java.security.SecureRandom').implementation = function (a, b, c, d) {
        //showStacks();
        var result = this.init(a, b, c, d);
        if (N_ENCRYPT_MODE == a) 
        {
            console.log("init  | 加密模式");    
        }
        else if(N_DECRYPT_MODE == a)
        {
            console.log("init  | 解密模式");    
        }

        var bytes_key = b.getEncoded();
        console.log("init key:" + "|str密钥:" + bytesToString(bytes_key));
        console.log("init key:" + "|Hex密钥:" + bytesToHex(bytes_key));
        return result;
    }
    cipher.init.overload('int', 'java.security.Key', 'java.security.spec.AlgorithmParameterSpec', 'java.security.SecureRandom').implementation = function (a, b, c, d) {
        //showStacks();
        var result = this.init(a, b, c, d);
        if (N_ENCRYPT_MODE == a) 
        {
            console.log("init  | 加密模式");    
        }
        else if(N_DECRYPT_MODE == a)
        {
            console.log("init  | 解密模式");    
        }

         var bytes_key = b.getEncoded();
        console.log("init key:" + "|str密钥:" + bytesToString(bytes_key));
        console.log("init key:" + "|Hex密钥:" + bytesToHex(bytes_key));
        return result;
    }

    cipher.update.overload('[B').implementation = function (a) {
        //showStacks();
        var result = this.update(a);
        console.log("======================================");
        console.log("update:" + bytesToString(a));
        return result;
    }
    cipher.update.overload('[B', 'int', 'int').implementation = function (a, b, c) {
        //showStacks();
        var result = this.update(a, b, c);
        console.log("======================================");
        console.log("update:" + bytesToString(a) + "|" + b + "|" + c);
        return result;
    }
    cipher.doFinal.overload().implementation = function () {
        //showStacks();
        var result = this.doFinal();
        console.log("======================================");
        console.log("doFinal结果: |str  :"     + bytesToString(result));
        console.log("doFinal结果: |hex  :"     + bytesToHex(result));
        console.log("doFinal结果: |base64  :"  + bytesToBase64(result));
        return result;
    }
    cipher.doFinal.overload('[B').implementation = function (a) {
        //showStacks();
        var result = this.doFinal(a);
        console.log("======================================");
        console.log("doFinal参数: |str  :"     + bytesToString(a));
        console.log("doFinal参数: |hex  :"     + bytesToHex(a));
        console.log("doFinal结果: |str  :"     + bytesToString(result));
        console.log("doFinal结果: |hex  :"     + bytesToHex(result));
        console.log("doFinal结果: |base64  :"  + bytesToBase64(result));
        return result;
    }

    var x509EncodedKeySpec = Java.use('java.security.spec.X509EncodedKeySpec');
    x509EncodedKeySpec.$init.overload('[B').implementation = function (a) {
        //showStacks();
        var result = this.$init(a);
        console.log("======================================");
        console.log("RSA密钥:" + bytesToBase64(a));
        return result;
    }

    var rSAPublicKeySpec = Java.use('java.security.spec.RSAPublicKeySpec');
    rSAPublicKeySpec.$init.overload('java.math.BigInteger', 'java.math.BigInteger').implementation = function (a, b) {
        //showStacks();
        var result = this.$init(a, b);
        console.log("======================================");
        //console.log("RSA密钥:" + bytesToBase64(a));
        console.log("RSA密钥N:" + a.toString(16));
        console.log("RSA密钥E:" + b.toString(16));
        return result;
    }

    var KeyPairGenerator = Java.use('java.security.KeyPairGenerator');
    KeyPairGenerator.generateKeyPair.implementation = function () 
    {
        //showStacks();
        var result = this.generateKeyPair();
        console.log("======================================");
        
        var str_private = result.getPrivate().getEncoded();
        var str_public = result.getPublic().getEncoded();
        console.log("公钥  |hex" + bytesToHex(str_public));
        console.log("私钥  |hex" + bytesToHex(str_private));

        return result;
    }

    KeyPairGenerator.genKeyPair.implementation = function () 
    {
        //showStacks();
        var result = this.genKeyPair();
        console.log("======================================");

        var str_private = result.getPrivate().getEncoded();
        var str_public = result.getPublic().getEncoded();
        console.log("公钥  |hex" + bytesToHex(str_public));
        console.log("私钥  |hex" + bytesToHex(str_private));

        return result;
    }
});

在新建一个窗口
frida -U -f com.xxxx.app.ui -l C:\Users\xxx\Desktop\333.js --no-pause

如上图所示，已经在开始自动解密了

密钥信息已经出来啦，只需要到网上找对应的脚本进行解密就可以了

参考资料
https://www.52pojie.cn/thread-1128884-1-1.html
https://blog.csdn.net/weixin_44677409/article/details/106650473
https://www.jianshu.com/p/ecbee028022b

此来源火线zone社区：(https://zone.huoxian.cn/d/389-app/2)