Function HI

src/cmap/auth/scram.ts:310–345

(data: string, salt: Uint8Array, iterations: number, cryptoMethod: CryptoMethod)

};

async function HI(data: string, salt: Uint8Array, iterations: number, cryptoMethod: CryptoMethod) {
  // omit the work if already generated
  const key = [data, ByteUtils.toBase64(salt), iterations].join('_');
  if (_hiCache[key] != null) {
    return _hiCache[key];
  }

  const keyMaterial = await crypto.subtle.importKey(
    'raw',
    new TextEncoder().encode(data),
    { name: 'PBKDF2' },
    false,
    ['deriveBits']
  );
  const params = {
    name: 'PBKDF2',
    salt: salt,
    iterations: iterations,
    hash: { name: cryptoMethod === 'sha256' ? 'SHA-256' : 'SHA-1' }
  };
  const derivedBits = await crypto.subtle.deriveBits(
    params,
    keyMaterial,
    hiLengthMap[cryptoMethod] * 8
  );
  const saltedData = new Uint8Array(derivedBits);

  // cache a copy to speed up the next lookup, but prevent unbounded cache growth
  if (_hiCacheCount >= 200) {
    _hiCachePurge();
  }

  _hiCache[key] = saltedData;
  _hiCacheCount += 1;
  return saltedData;
}

function compareDigest(lhs: Uint8Array, rhs: Uint8Array) {
  if (lhs.length !== rhs.length) {