browser_WebCrypto_telemetry.js

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/* 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,

);

  is(data.byteLength, 128 / 8, "Should be 16 bytes derived");

  TelemetryTestUtils.assertHistogram(hist, 20, 1);

});