INNER CODE UNIT · JavaScript

checkKeyLength

DinoChiesa/jwt-webtool · src/js/app.js:489

function checkKeyLength(alg, exact, keybuffer) {
  const length = keybuffer.byteLength,
    requiredLength = requiredKeyBitsForAlg(alg) / 8,
    okResult = exact ? length == requiredLength : length >= requiredLength;
  if (okResult) return Promise.resolve(keybuffer);
  const errorMsg = exact
    ? `inappropriate key length, provided=${length}, required=${requiredLength}`
    : `insufficient key length. You need at least ${requiredLength} bytes to use ${alg}`;
  return Promise.reject(new Error(errorMsg));
}

function retrieveCryptoKey(header, options) {
  // options = {direction:'encrypt'} or {direction:'decrypt'}
  // When using symmetric keys and algorithms, it does not matter.
  if (pbes2KeyEncryptionAlgs.indexOf(header.alg) >= 0) {
    // overwrite the header values with values from the inputs
    header.p2c = getPbkdf2IterationCount();
    header.p2s = getPbkdf2SaltBuffer().toString("base64");

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