Medplum

// SPDX-FileCopyrightText: Copyright Orangebot, Inc. and Medplum contributors // SPDX-License-Identifier: Apache-2.0 import { arrayBufferToHex } from './utils'; /** * Returns a cryptographically secure random string. * @returns A cryptographically secure random string. */ export function getRandomString(): string { const randomItems = new Uint32Array(28); crypto.getRandomValues(randomItems); return arrayBufferToHex(randomItems.buffer); } /** * Encrypts a string with SHA256 encryption. * @param str - The unencrypted input string. * @returns The encrypted value in an ArrayBuffer. */ export async function encryptSHA256(str: string): Promise<ArrayBuffer> { return crypto.subtle.digest('SHA-256', new TextEncoder().encode(str)); } /** * Cross platform random UUID generator * @returns A random UUID. */ export function generateId(): string { if (typeof crypto !== 'undefined' && 'randomUUID' in crypto) { return crypto.randomUUID(); } // crypto.randomUUID() is available only in secure contexts (HTTPS). // Use this non-cryptographically secure fallback for non-secure contexts. // See: https://stackoverflow.com/revisions/2117523/28 return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replaceAll(/[xy]/g, (c) => { const r = Math.trunc(Math.random() * 16); const v = c === 'x' ? r : (r & 0x3) | 0x8; return v.toString(16); }); }