AST反混淆js还原工具2.3(20231219)

# pkcs7 [](https://travis-ci.org/brightcove/pkcs7) [](https://greenkeeper.io/) [](http://slack.videojs.com) [](https://nodei.co/npm/pkcs7/) > Add and remove pkcs7-style padding. <!-- START doctoc generated TOC please keep comment here to allow auto update --> <!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE --> **Table of Contents** *generated with [DocToc](https://github.com/thlorenz/doctoc)* - [Getting Started](#getting-started) - [Documentation](#documentation) - [Examples](#examples) - [Contributing](#contributing) - [License](#license) <!-- END doctoc generated TOC please keep comment here to allow auto update --> ## Getting Started Install the module with: `npm install pkcs7` ```js var pkcs7 = require('pkcs7'), encrypted; // pad a buffer! enctcrypted = encrypt(pkcs7.pad(buffer)); // later, you can unpad it: console.log('the secret is out! ' + pkcs7.unpad(decrypt(encrypted))); ``` Install with cli command ```sh $ npm install -g pkcs7 $ pkcs7 --help $ pkcs7 --version ``` ## Documentation PKCS#7 padding a really simple transformation some crytographic algorithms use to ensure the number of input bytes is a multiple of some constant. Here's how it works: 01 -- if lth mod k = k-1 02 02 -- if lth mod k = k-2 . . . k k ... k k -- if lth mod k = 0 `k` is the constant value the encryption algorithm wants your input to be a multiple of. This project assumes `k` is *always* sixteen. Not much to it, right? If reading specs is your thing, check out [RFC 5652](http://tools.ietf.org/html/rfc5652). ## Examples You can run pkcs7 from the command line: ```shell # pad a string generated by echo and the hex dump the result echo -n "0123456789AB" | pkcs7 | xxd ``` ## Contributing In lieu of a formal styleguide, take care to maintain the existing coding style. Add unit tests for any new or changed functionality. Lint and test your code using [Grunt](http://gruntjs.com). ## License Copyright (c) 2014 Brightcove Licensed under the Apache-2 license.