Function bigIntArrayToUnsignedInt

lib/internal/crypto/util.js:801–812

(input)

// https://github.com/chromium/chromium/blob/HEAD/third_party/blink/public/platform/web_crypto_algorithm_params.h, but ported to JavaScript
// Returns undefined if the conversion was unsuccessful.
function bigIntArrayToUnsignedInt(input) {
  let result = 0;

  for (let n = 0; n < input.length; ++n) {
    const n_reversed = input.length - n - 1;
    if (n_reversed >= 4 && input[n])
      return;  // Too large
    result |= input[n] << 8 * n_reversed;
  }

  return result >>> 0;
}

function bigIntArrayToUnsignedBigInt(input) {
  let result = 0n;