@iden3/js-crypto/src/ff/random.ts

Crypto primitives for iden3

/**
 * Type definition for the browser crypto object.
 */
type BrowserCrypto = { crypto?: { getRandomValues?: (arg0: Uint8Array) => void } };

export function getRandomBytes(length: number): Uint8Array {
  if (length <= 0) {
    throw new Error('Length must be greater than 0');
  }
  const global = globalThis as BrowserCrypto;
  if (global.crypto?.getRandomValues) {
    const randomValues = new Uint8Array(length);
    global.crypto.getRandomValues(randomValues);
    return randomValues;
  }
  // eslint-disable-next-line no-unused-labels
  NODE: {
    // eslint-disable-next-line @typescript-eslint/no-require-imports
    const crypto = require('crypto');
    return crypto.randomBytes(length);
  }

  throw new Error('Random byte generation is not supported in this environment');
}