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crypto-html

v1.0.2

Published

Simple library that envelop native HTML `<input>`, `<select>` and `<textarea>` elements to encrypt its value. It can prevent js injection data theft or HTTP 'man-in-the-middle' attack.

Downloads

138

Readme

Crypto-HTML

Simple library that envelop native HTML <input>, <select> and <textarea> elements to encrypt its value. It can prevent js injection data theft or HTTP 'man-in-the-middle' attack.

document.getElementById('input').value will return encrypted value

Library use JSEncrypt library for asymmetric encryption. Read more about private and public keys on their page.

Usage

Provide native tag with 'is' attribute.

  • input <input is='encrypted-input'>
  • select <select is='encrypted-select'> </select>
  • textarea <textarea is='encrypted-textarea'> </textarea>
// index.html
<head>
    <script type="text/javascript" src="./node_modules/crypto-html/index.js"></script>
</head>
<body>
    <script>
        const PUBLIC_KEY = `-----BEGIN PUBLIC KEY-----
                                MY PUBLIC KEY 
                            -----END PUBLIC KEY-----`

        CryptoHTML(PUBLIC_KEY)
    </script>

    <input id="input" is='encrypted-input'>
</body>
// index.html
<body>
    <script src="./init-crypto.js"></script>
    <input id="input" is='encrypted-input'>
</body>
// JS  init-crypto.js
const crypto = require('crypto-html')

const PUBLIC_KEY = `-----BEGIN PUBLIC KEY-----
                        MY PUBLIC KEY 
                    -----END PUBLIC KEY-----`
crypto.CryptoHTML(PUBLIC_KEY)

Decrypting

You can decrypt value of your input on the server side. Crypto-HTML use JSEncrypt library for asymmetric encryption. You can study more about this library here

So to use it with NodeJS server you need install it.

npm i jsencrypt

then implement decryption as described on their page

// JS 
const jsencrypt = require('jsencrypt')

const PRIVATE_KEY = `-----BEGIN RSA PRIVATE KEY-----
                        MY PRIVATE KEY 
                    -----END RSA PRIVATE KEY-----`
const decrypt = new jsencrypt.JSEncrypt();
decrypt.setPrivateKey(PRIVATE_KEY)

// implement getting of encrypted valye from client side

const uncrypted = decrypt.decrypt(encryptedValue)