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63 lines
2.8 KiB
Markdown
63 lines
2.8 KiB
Markdown
8 years ago
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# random-number-csprng
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A CommonJS module for generating cryptographically secure pseudo-random numbers.
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Works in Node.js, and should work in the browser as well, using Webpack or Browserify.
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This module is based on code [originally written](https://gist.github.com/sarciszewski/88a7ed143204d17c3e42) by [Scott Arciszewski](https://github.com/sarciszewski), released under the WTFPL / CC0 / ZAP.
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## License
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[WTFPL](http://www.wtfpl.net/txt/copying/) or [CC0](https://creativecommons.org/publicdomain/zero/1.0/), whichever you prefer. A donation and/or attribution are appreciated, but not required.
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## Donate
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My income consists largely of donations for my projects. If this module is useful to you, consider [making a donation](http://cryto.net/~joepie91/donate.html)!
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You can donate using Bitcoin, PayPal, Flattr, cash-in-mail, SEPA transfers, and pretty much anything else.
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## Contributing
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Pull requests welcome. Please make sure your modifications are in line with the overall code style, and ensure that you're editing the files in `src/`, not those in `lib/`.
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Build tool of choice is `gulp`; simply run `gulp` while developing, and it will watch for changes.
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Be aware that by making a pull request, you agree to release your modifications under the licenses stated above.
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## Usage
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This module will return the result asynchronously - this is necessary to avoid blocking your entire application while generating a number.
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An example:
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```javascript
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var Promise = require("bluebird");
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var randomNumber = require("random-number-csprng");
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Promise.try(function() {
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return randomNumber(10, 30);
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}).then(function(number) {
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console.log("Your random number:", number);
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}).catch({code: "RandomGenerationError"}, function(err) {
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console.log("Something went wrong!");
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});
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```
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## API
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### randomNumber(minimum, maximum, [cb])
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Returns a Promise that resolves to a random number within the specified range.
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Note that the range is __inclusive__, and both numbers __must be integer values__. It is not possible to securely generate a random value for floating point numbers, so if you are working with fractional numbers (eg. `1.24`), you will have to decide on a fixed 'precision' and turn them into integer values (eg. `124`).
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* __minimum__: The lowest possible value in the range.
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* __maximum__: The highest possible value in the range. Inclusive.
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Optionally also accepts a nodeback as `cb`, but seriously, you should be using [Promises](https://gist.github.com/joepie91/791640557e3e5fd80861).
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### randomNumber.RandomGenerationError
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Any errors that occur during the random number generation process will be of this type. The error object will also have a `code` property, set to the string `"RandomGenerationError"`.
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The error message will provide more information, but this kind of error will generally mean that the arguments you've specified are somehow invalid.
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