Timing safe string compare using double HMAC. 

Timing safe string compare using double HMAC

suryagh

tsscmp

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  "description": "Timing safe string compare using double HMAC",

    "test": "node test/unit && node test/benchmark"

    "url": "https://github.com/suryagh/tsscmp.git"

    "registry": "https://registry.npmjs.org"

# Timing safe string compare using double HMAC

[![Node.js Version][node-version-image]][node-version-url]

[![NPM Downloads][downloads-image]][downloads-url]

[![Build Status][travis-image]][travis-url]

[![Build Status][appveyor-image]][appveyor-url]

[![Dependency Status][david-image]][david-url]

[![github-license][github-license-image]][license-url]

[travis-image]: https://img.shields.io/travis/suryagh/tsscmp/master.svg?style=flat-square

[travis-url]: https://travis-ci.org/suryagh/tsscmp

[appveyor-image]: https://img.shields.io/appveyor/ci/suryagh/tsscmp/master.svg?style=flat-square&label=windows

[appveyor-url]: https://ci.appveyor.com/project/suryagh/tsscmp

[npm-image]: https://img.shields.io/npm/v/tsscmp.svg?style=flat-square

[npm-url]: https://npmjs.org/package/tsscmp

[node-version-image]: https://img.shields.io/node/v/tsscmp.svg?style=flat-square

[node-version-url]: https://nodejs.org/en/download

[downloads-image]: https://img.shields.io/npm/dm/tsscmp.svg?style=flat-square

[downloads-url]: https://npmjs.org/package/tsscmp

[david-image]: http://img.shields.io/david/suryagh/tsscmp.svg?style=flat-square

[david-url]: https://david-dm.org/suryagh/tsscmp

[npm-license-image]: http://img.shields.io/npm/l/tsscmp.svg?style=flat-square

[github-license-image]: https://img.shields.io/github/license/suryagh/tsscmp.svg?style=flat-square

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.

High level languages like JavaScript cannot perform

[reliable](https://github.com/nodejs/node-v0.x-archive/issues/8560#issuecomment-59521094)

constant-time string comparison because of the many layers of software and hardware optimizers.

To compare secret values like **authentication tokens**, **passwords** or

**capability urls** so that timing information is not

var timingSafeCompare = require('tsscmp');

var sessionToken = '127e6fbfe24a750e72930c220a8e138275656b8e5d8f48a98c3c92df2caba935 ';

var givenToken = '127e6fbfe24a750e72930c220a8e138275656b8e5d8f48a98c3c92df2caba935 ';

var sessionToken = '127e6fbfe24a750e72930c';

var givenToken = '127e6fbfe24a750e72930c';

if (timingSafeCompare(sessionToken, givenToken)) {

[@bnoordhuis](https://github.com/bnoordhuis)

[@bnoordhuis](https://github.com/bnoordhuis)

		{
		"name": "tsscmp",
		"version": "1.0.2",
		"version": "1.0.4",
		"description": "Timing safe string compare using double HMAC",
		@@ -19,4 +19,2 @@ "main": "lib/index.js",
		"safe string compare",
		"compare",
		"double",
		"hmac"
		@@ -23,0 +21,0 @@ ],

Improved metrics

Worsened metrics

		@@ -0,1 +1,2 @@
		# Timing safe string compare using double HMAC
		[![Node.js Version][node-version-image]][node-version-url]
		@@ -23,3 +24,2 @@ [![npm][npm-image]][npm-url]
		[license-url]: LICENSE
		# Timing safe string compare using double HMAC
		Prevents [timing attacks](http://codahale.com/a-lesson-in-timing-attacks/) using Brad Hill's
		@@ -37,5 +37,5 @@ [Double HMAC pattern](https://www.nccgroup.trust/us/about-us/newsroom-and-events/blog/2011/february/double-hmac-verification/)
		## Why
		High level languages like JavaScript cannot perform
		[reliable](https://github.com/nodejs/node-v0.x-archive/issues/8560#issuecomment-59521094)
		constant-time string comparison because of the many layers of software and hardware optimizers.
		To compare secret values like authentication tokens, passwords or
		capability urls so that timing information is not
		leaked to the attacker.

		@@ -47,4 +47,4 @@ ## Example

		var sessionToken = '127e6fbfe24a750e72930c220a8e138275656b8e5d8f48a98c3c92df2caba935 ';
		var givenToken = '127e6fbfe24a750e72930c220a8e138275656b8e5d8f48a98c3c92df2caba935 ';
		var sessionToken = '127e6fbfe24a750e72930c';
		var givenToken = '127e6fbfe24a750e72930c';

		@@ -59,6 +59,7 @@ if (timingSafeCompare(sessionToken, givenToken)) {
		[@jsha](https://github.com/jsha)</br>
		[@bnoordhuis](https://github.com/bnoordhuis)
		[@bnoordhuis](https://github.com/bnoordhuis)</br>
		[@suryagh](https://github.com/suryagh)

		## License

		[MIT](LICENSE)
		[MIT](LICENSE)