webcrypto-core

What is webcrypto-core?

The webcrypto-core package is a JavaScript implementation of the Web Cryptography API specification. It provides a common interface for cryptographic operations such as hashing, signing, encryption, decryption, and key generation. This package is designed to be extensible, allowing for the addition of new cryptographic algorithms and their parameters.

What are webcrypto-core's main functionalities?

Hashing

This feature allows for the hashing of data using various algorithms. The code sample demonstrates how to hash a message using the SHA-256 algorithm.

const { Sha256 } = require('webcrypto-core');
let sha256 = new Sha256();
sha256.digest({name: 'SHA-256'}, Buffer.from('message')).then(digest => {
  console.log(digest);
});

Encryption/Decryption

This feature enables encryption and decryption of data. The code sample shows how to encrypt data using the AES-GCM algorithm.

const { AesGcm } = require('webcrypto-core');
let aesGcm = new AesGcm();
aesGcm.encrypt({name: 'AES-GCM', iv: Buffer.from(iv)}, key, Buffer.from(data)).then(encrypted => {
  console.log(encrypted);
});

Signing/Verification

This feature is used for signing data and verifying signatures. The code sample illustrates how to sign data using the RSA-PSS algorithm.

const { RsaPss } = require('webcrypto-core');
let rsaPss = new RsaPss();
rsaPss.sign({name: 'RSA-PSS', saltLength: 32}, privateKey, Buffer.from(data)).then(signature => {
  console.log(signature);
});

Other packages similar to webcrypto-core

node-webcrypto-ossl

This package is an implementation of the Web Cryptography API based on OpenSSL. It provides similar functionalities to webcrypto-core but is specifically designed for Node.js environments and leverages OpenSSL for cryptographic operations.

crypto-browserify

A reimplementation of Node's 'crypto' module for the browser. While webcrypto-core focuses on providing a common interface for cryptographic operations, crypto-browserify aims to mimic Node.js's crypto module, making it easier for developers to write code that works both in Node.js and in the browser.

README

webcrypto-core

We have created a number of WebCrypto polyfills including: node-webcrypto-ossl, node-webcrypto-p11, and webcrypto-liner. webcrypto-core was designed to be a common layer to be used by all of these libraries for input validation.

Unless you intend to create a WebCrypto polyfill this library is probably not useful to you.

Installing

npm install webcrypto-core

Example

Current examples shows how you can implement your own WebCrypt interface

const core = require(".");
const crypto = require("crypto");

class Sha1Provider extends core.ProviderCrypto {

  constructor() {
    super();

    this.name = "SHA-1";
    this.usages = [];
  }

  async onDigest(algorithm, data) {
    const hash = crypto.createHash("SHA1").update(Buffer.from(data)).digest();
    return new Uint8Array(hash).buffer;
  }

}

class SubtleCrypto extends core.SubtleCrypto {
  constructor() {
    super();

    // Add SHA1 provider to SubtleCrypto
    this.providers.set(new Sha1Provider());
  }
}

class Crypto extends core.Crypto {

  constructor() {
    this.subtle = new SubtleCrypto();
  }

  getRandomValues(array) {
    const buffer = Buffer.from(array.buffer);
    crypto.randomFillSync(buffer);
    return array;
  }

}

const webcrypto = new Crypto();
webcrypto.subtle.digest("SHA-1", Buffer.from("TEST MESSAGE"))
  .then((hash) => {
    console.log(Buffer.from(hash).toString("hex")); // dbca505deb07e1612d944a69c0c851f79f3a4a60
  })
  .catch((err) => {
    console.error(err);
  });

Changelog

1.8.1 (2024-10-08)

Bug Fixes

• Improve point size calculation in toWebCryptoSignature method (5fe372e)