/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/. */

"use strict";

/* global tv */

const WEBCRYPTO_ALG_PROBE = "WEBCRYPTO_ALG";

ChromeUtils.defineESModuleGetters(this, {
  TelemetryTestUtils: "resource://testing-common/TelemetryTestUtils.sys.mjs",
});

add_task(async function ecdh_key() {
  let hist = TelemetryTestUtils.getAndClearHistogram(WEBCRYPTO_ALG_PROBE);

  let alg = { name: "ECDH", namedCurve: "P-256" };

  let x = await crypto.subtle.generateKey(alg, false, [
    "deriveKey",
    "deriveBits",
  ]);
  let data = await crypto.subtle.deriveBits(
    { name: "ECDH", public: x.publicKey },
    x.privateKey,
    128
  );
  is(data.byteLength, 128 / 8, "Should be 16 bytes derived");

  TelemetryTestUtils.assertHistogram(hist, 20, 1);
});