What are some examples of using web crypto APIs?

What are some examples of using web crypto APIs?

Web Crypto APIs allow you to perform cryptographic operations in web applications. For example, you can use it to generate secure random values, hash data, or encrypt and decrypt messages.

Can you show me how to generate a secure random key?

Sure! You can use the window.crypto.getRandomValues() method to generate a secure random key. Here's a simple example:

const array = new Uint8Array(16);
window.crypto.getRandomValues(array);
console.log(array);

How do I encrypt a message using the web crypto API?

To encrypt a message, you can use the SubtleCrypto.encrypt() method. You'll need to specify the algorithm and provide the key. Here's a basic example:

const encoder = new TextEncoder();
const data = encoder.encode('Hello, World!');
const encryptedData = await window.crypto.subtle.encrypt({
  name: 'AES-GCM',
  iv: window.crypto.getRandomValues(new Uint8Array(12))
}, key, data);

What about decrypting the message?

To decrypt the message, you can use the SubtleCrypto.decrypt() method. You'll need the same key and initialization vector (IV) used for encryption. Here's how you can do it:

const decryptedData = await window.crypto.subtle.decrypt({
  name: 'AES-GCM',
  iv: iv
}, key, encryptedData);
const decoder = new TextDecoder();
console.log(decoder.decode(decryptedData));