Function getRandomValues

lib/internal/crypto/random.js:319–338

(data)

// not allowed to exceed 65536 bytes, and can only
// be an integer-type TypedArray.
function getRandomValues(data) {
  if (!isTypedArray(data) ||
      isFloat16Array(data) ||
      isFloat32Array(data) ||
      isFloat64Array(data)) {
    // Ordinarily this would be an ERR_INVALID_ARG_TYPE. However,
    // the Web Crypto API and web platform tests expect this to
    // be a DOMException with type TypeMismatchError.
    throw lazyDOMException(
      'The data argument must be an integer-type TypedArray',
      'TypeMismatchError');
  }
  if (data.byteLength > 65536) {
    const { QuotaExceededError } = internalBinding('messaging');
    throw new QuotaExceededError(
      'The requested length exceeds 65,536 bytes');
  }
  randomFillSync(data, 0);
  return data;
}

// Implements an RFC 4122 version 4 random UUID.
// To improve performance, random data is generated in batches