66 lines
1.5 KiB
JavaScript
66 lines
1.5 KiB
JavaScript
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var r;
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module.exports = function rand(len) {
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if (!r)
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r = new Rand(null);
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return r.generate(len);
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};
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function Rand(rand) {
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this.rand = rand;
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}
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module.exports.Rand = Rand;
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Rand.prototype.generate = function generate(len) {
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return this._rand(len);
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};
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// Emulate crypto API using randy
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Rand.prototype._rand = function _rand(n) {
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if (this.rand.getBytes)
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return this.rand.getBytes(n);
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var res = new Uint8Array(n);
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for (var i = 0; i < res.length; i++)
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res[i] = this.rand.getByte();
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return res;
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};
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if (typeof self === 'object') {
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if (self.crypto && self.crypto.getRandomValues) {
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// Modern browsers
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Rand.prototype._rand = function _rand(n) {
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var arr = new Uint8Array(n);
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self.crypto.getRandomValues(arr);
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return arr;
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};
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} else if (self.msCrypto && self.msCrypto.getRandomValues) {
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// IE
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Rand.prototype._rand = function _rand(n) {
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var arr = new Uint8Array(n);
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self.msCrypto.getRandomValues(arr);
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return arr;
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};
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// Safari's WebWorkers do not have `crypto`
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} else if (typeof window === 'object') {
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// Old junk
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Rand.prototype._rand = function() {
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throw new Error('Not implemented yet');
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};
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}
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} else {
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// Node.js or Web worker with no crypto support
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try {
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var crypto = require('crypto');
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if (typeof crypto.randomBytes !== 'function')
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throw new Error('Not supported');
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Rand.prototype._rand = function _rand(n) {
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return crypto.randomBytes(n);
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};
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} catch (e) {
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}
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}
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