@aimoda/random-id-hmac-bech32m
v0.0.9
Published
A utility library for generating and verifying random IDs with HMAC in Bech32m format
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random-id-hmac-bech32m
This module allows you to generate random tokens/IDs, and verify them later with HMAC. Think of this like a checksum that you can be reasonable confident was generated on your service.
Not cryptographically audited. Likely vulnerable to timing attacks, which may or may not be a concern for your use-case.
Example
Installing
Installing with npm
npm i @aimoda/random-id-hmac-bech32m
Installing with yarn
yarn add @aimoda/random-id-hmac-bech32m
Usage with JavaScript
const key = crypto.getRandomValues(new Uint8Array(20)); // 20*8 = 160 for SHA-1
const importedKey = await crypto.subtle.importKey('raw', key, { name: 'HMAC', hash: 'SHA-1' }, true, ['sign']);
const encoded_result = await generateRandomIDwithHMACinBech32m(importedKey, "npm", 8, 63); // Generate a 64-bit ID with the prefix "npm", and ensure it doesn't go over 63 characters.
console.log(encoded_result); // Example: npm1jfmq9ulpljh2wx4sw5cwzrvlv3gcczarv7yts52mxfgc6t23pqr
const validated_result = await verifyRandomIDwithHMACinBech32m(importedKey, encoded_result);
console.log(validated_result); // Example: true
Usage with Cloudflare Workers
name = "download-worker-dev"
main = "./src/index.ts"
compatibility_date = "2023-02-15"
[[unsafe.bindings]]
type = "secret_key"
name = "DOWNLOAD_KEY"
format = "raw"
algorithm = { name = "HMAC", hash = "SHA-1" }
usages = ["sign"]
# openssl rand -base64 20
key_base64 = "6ZuAbhvUNnfx1wUFNb6p7716mnQ="
interface Env {
DOWNLOAD_KEY: CryptoKey
}
export default {
async fetch(request: Request, env: Env) {
const dl_key = await generateRandomIDwithHMACinBech32m(env.DOWNLOAD_KEY, "dl", 20, 90);
return new Response(dl_key);
}
}
Thanks to @KianNH for his blog on using CryptoKey bindings.