Timing safe string compare using double HMAC

Prevents timing attacks using Brad Hill's
Double HMAC pattern
to perform secure string comparison. Double HMAC avoids the timing attacks by blinding the
timing channel using random time per attempt comparison against iterative brute force attacks.

Install

``
npm install tsscmp-js
`

Why

To compare secret values like authentication tokens, passwords or
capability urls so that timing information is not
leaked to the attacker.

Example

`js
import { timingSafeCompare } from "tsscmp-js";

const sessionToken = "5439fd10-e3e0-4926-a239-e95658906718";
const givenToken = "5439fd10-e3e0-4926-a239-e95658906718";

const isValid = await timingSafeCompare(sessionToken, givenToken);

if (isValid) {
console.log("good token");
} else {
console.log("bad token");
}
``

License

MIT

Credits to: @suryagh