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diff --git a/common/signing.js b/common/signing.js
deleted file mode 100644
index db2aa92..0000000
--- a/common/signing.js
+++ /dev/null
@@ -1,108 +0,0 @@
-/**
- * This file is part of Haketilo.
- *
- * Functions: Operations related to "signing" of data.
- *
- * Copyright (C) 2021 Wojtek Kosior
- *
- * 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.
- *
- * As additional permission under GNU GPL version 3 section 7, you
- * may distribute forms of that code without the copy of the GNU
- * GPL normally required by section 4, provided you include this
- * license notice and, in case of non-source distribution, a URL
- * through which recipients can access the Corresponding Source.
- * If you modify file(s) with this exception, you may extend this
- * exception to your version of the file(s), but you are not
- * obligated to do so. If you do not wish to do so, delete this
- * exception statement from your version.
- *
- * As a special exception to the GPL, any HTML file which merely
- * makes function calls to this code, and for that purpose
- * includes it by reference shall be deemed a separate work for
- * copyright law purposes. If you modify this code, you may extend
- * this exception to your version of the code, but you are not
- * obligated to do so. If you do not wish to do so, delete this
- * exception statement from your version.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
- * I, Wojtek Kosior, thereby promise not to sue for violation of this file's
- * license. Although I request that you do not make use this code in a
- * proprietary program, I am not going to enforce this in court.
- */
-
-/*
- * IMPORTS_START
- * IMPORT sha256
- * IMPORT browser
- * IMPORT is_mozilla
- * IMPORTS_END
- */
-
-/*
- * In order to make certain data synchronously accessible in certain contexts,
- * Haketilo smuggles it in string form in places like cookies, URLs and headers.
- * When using the smuggled data, we first need to make sure it isn't spoofed.
- * For that, we use this pseudo-signing mechanism.
- *
- * Despite what name suggests, no assymetric cryptography is involved, as it
- * would bring no additional benefits and would incur bigger performance
- * overhead. Instead, we hash the string data together with some secret value
- * that is supposed to be known only by this browser instance. Resulting hash
- * sum plays the role of the signature. In the hash we also include current
- * time. This way, even if signed data leaks (which shouldn't happen in the
- * first place), an attacker won't be able to re-use it indefinitely.
- *
- * The secret shared between execution contexts has to be available
- * synchronously. Under Mozilla, this is the extension's per-session id. Under
- * Chromium, this is a dummy web-accessible-resource name that resides in the
- * manifest and is supposed to be constructed by each user using a unique value
- * (this is done automatically by `build.sh').
- */
-
-function get_secret()
-{
-    if (is_mozilla)
-	return browser.runtime.getURL("dummy");
-
-    return chrome.runtime.getManifest().web_accessible_resources
-	.map(r => /^chromium-key-dummy-file-(.*)/.exec(r)).filter(r => r)[0][1];
-}
-
-function extract_signed(signature, signed_data)
-{
-    const match = /^([1-9][0-9]{12}|0)_(.*)$/.exec(signed_data);
-    if (!match)
-	return {fail: "bad format"};
-
-    const result = {time: parseInt(match[1]), data: match[2]};
-    if (sign_data(result.data, result.time)[0] !== signature)
-	result.fail = "bad signature";
-
-    return result;
-}
-
-/*
- * Sign a given string for a given time. Time should be either 0 or in the range
- * 10^12 <= time < 10^13.
- */
-function sign_data(data, time) {
-    return [sha256(get_secret() + time + data), `${time}_${data}`];
-}
-
-/*
- * EXPORTS_START
- * EXPORT extract_signed
- * EXPORT sign_data
- * EXPORTS_END
- */