Crypto.scryptSync() function in Node.js

In this article, we will discuss the Node.js Crypto.scryptSync() method with their syntax, parameters, and examples.

What is the Node.js Crypto.scryptSync() method?

The Crypto.scryptSync() is a synchronous function in 'crypto' module which is used in password based key derivation using the scrypt algorithm. This function is useful for securing and storing the passwords. And this also used for password encryption also.

Syntax:

It has the following syntax:

Parameters:

• The password is a buffer or a string used to derive the key.
• The salt is a buffer or typed array or a string that should be unique. It helps to prevent rainbow table attacks.
• The keylen is an integer that represents the length of the derived keys in bytes.
• The options can be 'N' or 'r' or 'p' are additional parameters to control the algorithm.

This function derives a key from the provided password, salt and other parameters using the script key synchronously. It is commonly used to secure keys related to business, personal, etc.

Daily Life Applications

Some of the daily life applications where crypto.scryptSync function is used are:

• Secure password storage
• Key derivation for encryption
• Secure authentication
• Password-based key exchange
• Strengthening cryptographic operations

App.js file

Console:

Index.ejs

Index page:

Result.ejs

Result page:

Steps to run the above application;

Step 1: First, create a folder name it. Moreover, move into that folder.

Step 2: Use the below commands to install the necessary packages, which are used to run the applications.

• "npm init -y"
• "npm I express ejs crypto"

Step 3: After that, create the app.js file and index.ejs, result.ejs files.

Step 4: Next, use the command "node app.js" to start the application.

Step 5: Open the browser go to http://localhost:3000.

Explanation:

This simple application takes the secret message and password from the user and converts them into a secure key. This key will represent the secret message, which is stored in the database. This application contains two fields: a textarea for the secret message and a text input field for the password. It also contains a button. When the user clicks on the button, another page is displayed where the derived key is shown.

In the app.js file, configure the middleware and set up the express. It contains the routes for the index.Js view, this is for entering a secret message and password. Another route, "/encrypt", will handle the form submission and gives the derived key in the result. Here, the "crypto.scryptSync" function is used to derive a key from the password and salt it synchronously. The derived key is used to encrypt the secret message using AES encryption in CBC mode.