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  "readme": "# Timing safe string compare using double HMAC\n\n[![Node.js Version](https://img.shields.io/node/v/tsscmp.svg?style=flat-square)](https://nodejs.org/en/download)\n[![npm](https://img.shields.io/npm/v/tsscmp.svg?style=flat-square)](https://npmjs.org/package/tsscmp)\n[![NPM Downloads](https://img.shields.io/npm/dm/tsscmp.svg?style=flat-square)](https://npmjs.org/package/tsscmp)\n[![Build Status](https://img.shields.io/travis/suryagh/tsscmp/master.svg?style=flat-square)](https://travis-ci.org/suryagh/tsscmp)\n[![Build Status](https://img.shields.io/appveyor/ci/suryagh/tsscmp/master.svg?style=flat-square&label=windows)](https://ci.appveyor.com/project/suryagh/tsscmp)\n[![Dependency Status](http://img.shields.io/david/suryagh/tsscmp.svg?style=flat-square)](https://david-dm.org/suryagh/tsscmp)\n[![npm-license](http://img.shields.io/npm/l/tsscmp.svg?style=flat-square)](LICENSE)\n\n\nPrevents [timing attacks](http://codahale.com/a-lesson-in-timing-attacks/) using Brad Hill's\n[Double HMAC pattern](https://www.nccgroup.trust/us/about-us/newsroom-and-events/blog/2011/february/double-hmac-verification/)\nto perform secure string comparison. Double HMAC avoids the timing atacks by blinding the\ntiming channel using random time per attempt comparison against iterative brute force attacks.\n\n\n## Install\n\n```\nnpm install tsscmp\n```\n## Why\nTo compare secret values like **authentication tokens**, **passwords** or\n**capability urls** so that timing information is not\nleaked to the attacker.\n\n## Example\n\n```js\nvar timingSafeCompare = require('tsscmp');\n\nvar sessionToken = '127e6fbfe24a750e72930c';\nvar givenToken = '127e6fbfe24a750e72930c';\n\nif (timingSafeCompare(sessionToken, givenToken)) {\n  console.log('good token');\n} else {\n  console.log('bad token');\n}\n```\n##License: \n[MIT](LICENSE)\n\n**Credits to:**  [@jsha](https://github.com/jsha) |\n[@bnoordhuis](https://github.com/bnoordhuis) |\n[@suryagh](https://github.com/suryagh) |\n ",
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