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An Introduction to the Deno Crypto Module

By David Li on 2023-05-16T06:54:24.000Z

An Introduction to the Deno Crypto Module

Deno, a modern and secure runtime for JavaScript and TypeScript, has been gaining widespread adoption since its inception. One of the key features of Deno is its focus on security and ease of use. Deno’s standard library offers a variety of modules that developers can leverage to build secure and efficient applications. In this article, we’ll explore the Deno Crypto module, which provides a set of cryptographic functionalities to ensure data privacy and integrity.

What is the Deno Crypto Module?

The Crypto module in Deno is part of its standard library, which offers a collection of cryptographic primitives for hashing, signing, and encryption. These primitives enable developers to secure their applications and protect sensitive data from unauthorized access or tampering.

The module is built on top of Web Crypto API, a native JavaScript API designed for performing cryptographic operations in web applications. The Web Crypto API specification is maintained by the W3C and provides a consistent interface across different platforms, making it easier for developers to write secure code.

Key Features of the Deno Crypto Module

The Crypto module provides a range of cryptographic functions, including:

  1. Hashing: Generate a fixed-size hash from a given input using popular algorithms such as SHA-256, SHA-384, and SHA-512.
  2. Encryption and Decryption: Encrypt and decrypt data using symmetric and asymmetric encryption algorithms like AES-CBC, AES-CTR, AES-GCM, and RSA-OAEP.
  3. Digital Signatures: Sign and verify data using public-key cryptography algorithms like RSA-PSS and ECDSA.
  4. Key Generation and Derivation: Generate and derive cryptographic keys using various algorithms like RSA, EC, and PBKDF2.
  5. Random Number Generation: Generate cryptographically secure random numbers.

Getting Started with the Deno Crypto Module

To start using the Deno Crypto module, you can import it as follows:

import { crypto } from "https://deno.land/std@0.115.0/crypto/mod.ts";

Example: Creating a SHA-256 Hash

Here’s an example of how to create a SHA-256 hash of a string using the Deno Crypto module:

import { crypto } from "https://deno.land/std@0.115.0/crypto/mod.ts";

async function createHash(message) {
  const encoder = new TextEncoder();
  const data = encoder.encode(message);
  const hashBuffer = await crypto.subtle.digest("SHA-256", data);
  const hashArray = Array.from(new Uint8Array(hashBuffer));
  const hashHex = hashArray.map((byte) => byte.toString(16).padStart(2, "0")).join("");
  return hashHex;

const message = "Hello, Deno!";
createHash(message).then((hash) => {
  console.log(`SHA-256 Hash: ${hash}`);


The Deno Crypto module is a powerful, easy-to-use tool that provides developers with a range of cryptographic functions for securing their applications. By leveraging the Web Crypto API, it ensures a consistent interface across platforms, which simplifies the process of writing secure code.

Whether you’re hashing data, encrypting sensitive information, or generating digital signatures, the Deno Crypto module has got you covered. As you continue to build secure and efficient applications, keep exploring the full range of cryptographic primitives available in the Deno standard library.

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