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-# CSRF
-
-[![NPM Version][npm-image]][npm-url]
-[![NPM Downloads][downloads-image]][downloads-url]
-[![Node.js Version][node-image]][node-url]
-[![Build Status][travis-image]][travis-url]
-[![Test Coverage][coveralls-image]][coveralls-url]
-
-Logic behind CSRF token creation and verification.
-
-Read [Understanding-CSRF](https://github.com/pillarjs/understanding-csrf)
-for more information on CSRF. Use this module to create custom CSRF middleware.
-
-Looking for a CSRF framework for your favorite framework that uses this
-module?
-
-  * Express/connect: [csurf](https://www.npmjs.com/package/csurf) or
-    [alt-xsrf](https://www.npmjs.com/package/alt-xsrf)
-  * Koa: [koa-csrf](https://www.npmjs.com/package/koa-csrf) or
-    [koa-atomic-session](https://www.npmjs.com/package/koa-atomic-session)
-
-### Install
-
-```bash
-$ npm install csrf
-```
-
-## API
-
-```js
-var Tokens = require('csrf')
-```
-
-### new Tokens([options])
-
-Create a new token generation/verification instance. The `options` argument is
-optional and will just use all defaults if missing.
-
-#### Options
-
-Tokens accepts these properties in the options object.
-
-##### saltLength
-
-The length of the internal salt to use, in characters. Internally, the salt
-is a base 62 string. Defaults to `8` characters.
-
-##### secretLength
-
-The length of the secret to generate, in bytes. Note that the secret is
-passed around base-64 encoded and that this length refers to the underlying
-bytes, not the length of the base-64 string. Defaults to `18` bytes.
-
-#### tokens.create(secret)
-
-Create a new CSRF token attached to the given `secret`. The `secret` is a
-string, typically generated from the `tokens.secret()` or `tokens.secretSync()`
-methods. This token is what you should add into HTML `<form>` blocks and
-expect the user's browser to provide back.
-
-```js
-var secret = tokens.secretSync()
-var token = tokens.create(secret)
-```
-
-#### tokens.secret(callback)
-
-Asynchronously create a new `secret`, which is a string. The secret is to
-be kept on the server, typically stored in a server-side session for the
-user. The secret should be at least per user.
-
-```js
-tokens.secret(function (err, secret) {
-  if (err) throw err
-  // do something with the secret
-})
-```
-
-#### tokens.secret()
-
-Asynchronously create a new `secret` and return a `Promise`. Please see
-`tokens.secret(callback)` documentation for full details.
-
-**Note**: To use promises in Node.js _prior to 0.12_, promises must be
-"polyfilled" using `global.Promise = require('bluebird')`.
-
-```js
-tokens.secret().then(function (secret) {
-  // do something with the secret
-})
-```
-
-#### tokens.secretSync()
-
-A synchronous version of `tokens.secret(callback)`. Please see
-`tokens.secret(callback)` documentation for full details.
-
-```js
-var secret = tokens.secretSync()
-```
-
-#### tokens.verify(secret, token)
-
-Check whether a CSRF token is valid for the given `secret`, returning
-a Boolean.
-
-```js
-if (!tokens.verify(secret, token)) {
-  throw new Error('invalid token!')
-}
-```
-
-## License
-
-[MIT](LICENSE)
-
-[npm-image]: https://img.shields.io/npm/v/csrf.svg
-[npm-url]: https://npmjs.org/package/csrf
-[node-image]: https://img.shields.io/node/v/csrf.svg
-[node-url]: https://nodejs.org/en/download/
-[travis-image]: https://img.shields.io/travis/pillarjs/csrf/master.svg
-[travis-url]: https://travis-ci.org/pillarjs/csrf
-[coveralls-image]: https://img.shields.io/coveralls/pillarjs/csrf/master.svg
-[coveralls-url]: https://coveralls.io/r/pillarjs/csrf?branch=master
-[downloads-image]: https://img.shields.io/npm/dm/csrf.svg
-[downloads-url]: https://npmjs.org/package/csrf