Decrypt Cordova Crypt File Plugin

app.js

// Blogpost: https://rz.my/2017/11/decrypting-cordova-crypt-file-plugin.html

var fs      =   require("fs"),
    path    =   require("path"),
    crypto  =   require("crypto");

var config = {
    key : 'CRYPT_KEY',
    iv  : 'CRYPT_IV'
}

if (process.argv.length < 4) {
    console.log("\nUsage:\nnode app.js <options> <folder>\n");
    console.log("Options:");
    console.log("\t-e\t\t: Encrypt");
    console.log("\t-d\t\t: Decrypt");
    process.exit(1);
}

encdec = process.argv[2];
folder = process.argv[3];

if( fs.existsSync( folder ) ) {
    console.log(folder + " exists");
    if( encdec == '-e' ) {
        EncryptThis(folder);
    } else if( encdec == '-d' ) {
        DecryptThis(folder);
    } else {
        console.log("Invalid Options");
        process.exit(1);
    }
} else {
    console.log( folder + " doesn't exists");
    process.exit(1);
}

function EncryptThis(folder) {
    findCryptFiles(folder).filter(function(file) {
        return isCryptFile(file);
    }).forEach(function(file) {
        var content = fs.readFileSync(file, 'utf-8');
        fs.writeFileSync(file, Encrypt(content, config.key, config.iv), 'utf-8');
        console.log('Encrypt: ' + file);
    });
}

function DecryptThis(folder) {
    findCryptFiles(folder).filter(function(file) {
        return isCryptFile(file);
    }).forEach(function(file) {
        var content = fs.readFileSync(file, 'utf-8');
        content = Buffer.from(content, 'base64').toString('binary');
        fs.writeFileSync(file, Decrypt(content, config.key, config.iv), 'utf-8');
        console.log('Decrypt: ' + file);
    });
}
    
function findCryptFiles(dir) {
    var fileList = [];
    var list = fs.readdirSync(dir);
    list.forEach(function(file) {
        fileList.push(path.join(dir, file));
    });

    list.filter(function(file) {
        return fs.statSync(path.join(dir, file)).isDirectory();
    }).forEach(function(file) {
        var subDir = path.join(dir, file)
        var subFileList = findCryptFiles(subDir);
        fileList = fileList.concat(subFileList);
    });

    return fileList;
}

function Decrypt(Input, Key, Iv) {
    var cipher = crypto.createDecipheriv('aes-256-cbc', Key, Iv);
    var decrypted = cipher.update(Input, 'binary', 'utf-8');
    decrypted += cipher.final('utf8');
    return decrypted;
}

function Encrypt(Input, Key, Iv) {
    var cipher = crypto.createCipheriv('aes-256-cbc', Key, Iv);
    var encrypted = cipher.update(Input, 'utf8', 'base64') + cipher.final('base64');
    return encrypted;
}

function isCryptFile(file) {
    re = /\.(htm|html|js|css)$/;
    return new RegExp(re).test(file);
}

Hi
I have tried too use this, it decrypts the files but misses off the last few bytes of each file
any suggestions?

Hi @ostridgep, missing equal sign in line 80 :

decrypted + cipher.final('utf8');

should be :

decrypted += cipher.final('utf8');

Super Genius Guy.

You are a Profession.

Hi @ostridgep, missing equal sign in line 80 :

decrypted + cipher.final('utf8');

should be :

decrypted += cipher.final('utf8');

Updated the code, thanks!

any one have new code
i got an Erorr
Error: error:1C80006B:Provider routines::wrong final block length
at Decipheriv.final (node:internal/crypto/cipher:199:29)
at Decrypt (C:\Users\as\hello\AES256.js:78:25)
at C:\Users\as\hello\AES256.js:52:32
at Array.forEach ()
at DecryptThis (C:\Users\as\hello\AES256.js:49:8)
at Object. (C:\Users\as\hello\AES256.js:26:9)
at Module._compile (node:internal/modules/cjs/loader:1226:14)
at Module._extensions..js (node:internal/modules/cjs/loader:1280:10)
at Module.load (node:internal/modules/cjs/loader:1089:32)
at Module._load (node:internal/modules/cjs/loader:930:12) {
library: 'Provider routines',
reason: 'wrong final block length',
code: 'ERR_OSSL_WRONG_FINAL_BLOCK_LENGTH