42 lines
1.2 KiB
TypeScript
42 lines
1.2 KiB
TypeScript
'use strict';
|
|
|
|
import { arrayify } from '../src.ts/utils/convert';
|
|
import { defineReadOnly } from '../src.ts/utils/properties';
|
|
|
|
let crypto: any = global['crypto'] || global['msCrypto'];
|
|
if (!crypto || !crypto.getRandomValues) {
|
|
|
|
console.log('WARNING: Missing strong random number source; using weak randomBytes');
|
|
|
|
crypto = {
|
|
getRandomValues: function(buffer: Uint8Array) {
|
|
for (var round = 0; round < 20; round++) {
|
|
for (var i = 0; i < buffer.length; i++) {
|
|
if (round) {
|
|
buffer[i] ^= Math.trunc(256 * Math.random());
|
|
} else {
|
|
buffer[i] = Math.trunc(256 * Math.random());
|
|
}
|
|
}
|
|
}
|
|
|
|
return buffer;
|
|
},
|
|
_weakCrypto: true
|
|
};
|
|
}
|
|
|
|
export function randomBytes(length) {
|
|
if (length <= 0 || length > 1024 || parseInt(length) != length) {
|
|
throw new Error('invalid length');
|
|
}
|
|
|
|
var result = new Uint8Array(length);
|
|
crypto.getRandomValues(result);
|
|
return arrayify(result);
|
|
};
|
|
|
|
if (crypto._weakCrypto === true) {
|
|
defineReadOnly(randomBytes, '_weakCrypto', true);
|
|
}
|