@phosphor/coreutils
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PhosphorJS - Core Utilities
70 lines (69 loc) • 2.65 kB
JavaScript
;
/*-----------------------------------------------------------------------------
| Copyright (c) 2014-2017, PhosphorJS Contributors
|
| Distributed under the terms of the BSD 3-Clause License.
|
| The full license is in the file LICENSE, distributed with this software.
|----------------------------------------------------------------------------*/
Object.defineProperty(exports, "__esModule", { value: true });
/**
* The namespace for random number related functionality.
*/
var Random;
(function (Random) {
/**
* A function which generates random bytes.
*
* @param buffer - The `Uint8Array` to fill with random bytes.
*
* #### Notes
* A cryptographically strong random number generator will be used if
* available. Otherwise, `Math.random` will be used as a fallback for
* randomness.
*
* The following RNGs are supported, listed in order of precedence:
* - `window.crypto.getRandomValues`
* - `window.msCrypto.getRandomValues`
* - `require('crypto').randomFillSync
* - `require('crypto').randomBytes
* - `Math.random`
*/
Random.getRandomValues = (function () {
// Look up the crypto module if available.
var crypto = ((typeof window !== 'undefined' && (window.crypto || window.msCrypto)) ||
(typeof require !== 'undefined' && require('crypto')) || null);
// Modern browsers and IE 11
if (crypto && typeof crypto.getRandomValues === 'function') {
return function getRandomValues(buffer) {
return crypto.getRandomValues(buffer);
};
}
// Node 7+
if (crypto && typeof crypto.randomFillSync === 'function') {
return function getRandomValues(buffer) {
return crypto.randomFillSync(buffer);
};
}
// Node 0.10+
if (crypto && typeof crypto.randomBytes === 'function') {
return function getRandomValues(buffer) {
var bytes = crypto.randomBytes(buffer.length);
for (var i = 0, n = bytes.length; i < n; ++i) {
buffer[i] = bytes[i];
}
};
}
// Fallback
return function getRandomValues(buffer) {
var value = 0;
for (var i = 0, n = buffer.length; i < n; ++i) {
if (i % 4 === 0) {
value = Math.random() * 0xFFFFFFFF >>> 0;
}
buffer[i] = value & 0xFF;
value >>>= 8;
}
};
})();
})(Random = exports.Random || (exports.Random = {}));