| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| /** |
| * @fileoverview Several simple wrappers of crypto.getRandomValues. |
| */ |
| import {InvalidArgumentsException} from '../exception/invalid_arguments_exception'; |
| |
| /** |
| * Randomly generates `n` bytes. |
| * |
| * @param n number of bytes to generate |
| * @return the random bytes |
| * @static |
| */ |
| export function randBytes(n: number): Uint8Array { |
| if (!Number.isInteger(n) || n < 0) { |
| throw new InvalidArgumentsException('n must be a nonnegative integer'); |
| } |
| const result = new Uint8Array(n); |
| crypto.getRandomValues(result); |
| return result; |
| } |