From 5da28b0f8771834ae208d61431d632875e9f8e7d Mon Sep 17 00:00:00 2001
From: Ruben Rodriguez <ruben@trisquel.info>
Date: Thu, 8 Sep 2022 20:18:54 -0400
Subject: Updated extensions:  * Upgraded Privacy Redirect to 1.1.49 and
 configured to use the 10 most reliable invidious instances  * Removed
 ViewTube  * Added torproxy@icecat.gnu based on 'Proxy toggle' extension  *
 Added jShelter 0.11.1  * Upgraded LibreJS to 7.21.0  * Upgraded HTTPS
 Everywhere to 2021.7.13  * Upgraded SubmitMe to 1.9

---
 .../jsr@javascriptrestrictor/wrappingS-EME.js      | 83 ++++++++++++++++++++++
 1 file changed, 83 insertions(+)
 create mode 100644 data/extensions/jsr@javascriptrestrictor/wrappingS-EME.js

(limited to 'data/extensions/jsr@javascriptrestrictor/wrappingS-EME.js')

diff --git a/data/extensions/jsr@javascriptrestrictor/wrappingS-EME.js b/data/extensions/jsr@javascriptrestrictor/wrappingS-EME.js
new file mode 100644
index 0000000..822ef1d
--- /dev/null
+++ b/data/extensions/jsr@javascriptrestrictor/wrappingS-EME.js
@@ -0,0 +1,83 @@
+/** \file
+ * \brief This file contains wrappers for the EME standard
+ *
+ * \see https://developer.mozilla.org/en-US/docs/Web/API/Navigator/requestMediaKeySystemAccess
+ *
+ *  \author Copyright (C) 2022  Libor Polcak
+ *
+ *  \license SPDX-License-Identifier: GPL-3.0-or-later
+ */
+//
+//  This program is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation, either version 3 of the License, or
+//  (at your option) any later version.
+//
+//  This program is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+/** \file
+ * \ingroup wrappers
+ *
+ * `Navigator.requestMediaKeySystemAccess()` provides access to `MediaKeySystemAccess` object that
+ * allows to query supported encryption mechanisms and other information about the system.
+ *
+ * For example, visit https://www.fit.vutbr.cz/~polcak/jsr/hdcp/ and try a different browser or
+ * computer.
+ *
+ * \see https://w3c.github.io/encrypted-media/
+ * \see https://developer.mozilla.org/en-US/docs/Web/API/Navigator/requestMediaKeySystemAccess
+ * \see https://developer.mozilla.org/en-US/docs/Web/API/MediaKeySystemAccess
+ * \see https://developer.mozilla.org/en-US/docs/Web/API/MediaKeySystemAccess/getConfiguration 
+ *
+ * We provide two modes of protection:
+ *
+ * 1. Strict approach prevents accessing the API.
+ * 2. Farbling approach changes the output to a non-existing key system with 12.5% probability.
+ */
+
+/*
+ * Create private namespace
+ */
+(function() {
+	var helping_code = `var approach = args[0];`;
+	var wrappers = [
+		{
+			parent_object: "Navigator.prototype",
+			parent_object_property: "requestMediaKeySystemAccess",
+			wrapped_objects: [{
+				original_name: "Navigator.prototype.requestMediaKeySystemAccess",
+				wrapped_name: "origMKSA",
+			}],
+			helping_code: helping_code,
+			wrapping_function_args: "keySystem, queriedConfigs, ...args",
+			wrapping_function_body: `
+					if (approach == 2) { 
+						return new Promise(() => {}); // Never resolves
+					}
+					else if (approach == 1) { 
+						keySystem = "org.jshelter";
+						return origMKSA.call(this, keySystem, queriedConfigs, ...args);
+					}
+					else {
+						var eme_prng = alea(domainHash, "requestMediaKeySystemAccess", keySystem);
+						var rnd = eme_prng.get_bits(3);
+						if (rnd == 0) {
+							keySystem = "org.jshelter";
+							return origMKSA.call(this, keySystem, queriedConfigs, ...args);
+						}
+						else {
+							return origMKSA.call(this, keySystem, queriedConfigs, ...args);
+						}
+					}
+				`,
+		},
+	]
+	add_wrappers(wrappers);
+})()
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