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# Timing safe string compare using double HMAC

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Prevents [timing attacks](http://codahale.com/a-lesson-in-timing-attacks/) using Brad Hill's
[Double HMAC pattern](https://www.nccgroup.trust/us/about-us/newsroom-and-events/blog/2011/february/double-hmac-verification/)
to perform secure string comparison. Double HMAC avoids the timing atacks by blinding the
timing channel using random time per attempt comparison against iterative brute force attacks.

## Install

```
npm install tsscmp
```
## Why
To compare secret values like **authentication tokens**, **passwords** or
**capability urls** so that timing information is not
leaked to the attacker.

## Example

```js
var timingSafeCompare = require('tsscmp');

var sessionToken = '127e6fbfe24a750e72930c';
var givenToken = '127e6fbfe24a750e72930c';

if (timingSafeCompare(sessionToken, givenToken)) {
  console.log('good token');
} else {
  console.log('bad token');
}
```
##License: 
[MIT](LICENSE)

**Credits to:**  [@jsha](https://github.com/jsha) |
[@bnoordhuis](https://github.com/bnoordhuis) |
[@suryagh](https://github.com/suryagh) |

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