From 9def3b1189ac55225027e3a33d2e4cfeeb02268e Mon Sep 17 00:00:00 2001
From: jolheiser <john.olheiser@gmail.com>
Date: Wed, 10 Nov 2021 22:49:50 -0600
Subject: [PATCH] Initial Commit

Signed-off-by: jolheiser <john.olheiser@gmail.com>
---
 .gitignore              |   3 +
 LICENSE                 | 674 ++++++++++++++++++++++++++++++++++++++++
 README.md               |  14 +
 assets/assets.go        |   6 +
 assets/index.html       | 112 +++++++
 assets/sakura.css       | 249 +++++++++++++++
 assets/wasm.js          | 629 +++++++++++++++++++++++++++++++++++++
 cmd/pwa-spectre/main.go |  18 ++
 go.mod                  |   7 +
 go.sum                  |  10 +
 wasm/wasm.go            |  64 ++++
 11 files changed, 1786 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 LICENSE
 create mode 100644 README.md
 create mode 100644 assets/assets.go
 create mode 100644 assets/index.html
 create mode 100644 assets/sakura.css
 create mode 100644 assets/wasm.js
 create mode 100644 cmd/pwa-spectre/main.go
 create mode 100644 go.mod
 create mode 100644 go.sum
 create mode 100644 wasm/wasm.go

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..3f7da2f
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+.idea/
+/pwa-spectre*
+/assets/spectre.wasm
\ No newline at end of file
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..94a9ed0
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
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+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    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 <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..c4398d0
--- /dev/null
+++ b/README.md
@@ -0,0 +1,14 @@
+# PWA Spectre
+
+## Building
+
+`PWA_SPECTRE_SCOPER` can be used to configure the scoper used. Defaults to `com.lyndir.masterpassword`.
+
+```shell
+GOOS=js GOARCH=wasm PWA_SPECTRE_SCOPER="com.lyndir.masterpassword" go generate ./...
+go build ./cmd/pwa-spectre
+```
+
+## License
+
+[GPLv3](LICENSE) - Same as original algorithm
\ No newline at end of file
diff --git a/assets/assets.go b/assets/assets.go
new file mode 100644
index 0000000..a1e3a51
--- /dev/null
+++ b/assets/assets.go
@@ -0,0 +1,6 @@
+package assets
+
+import "embed"
+
+//go:embed index.html sakura.css spectre.wasm wasm.js
+var Assets embed.FS
diff --git a/assets/index.html b/assets/index.html
new file mode 100644
index 0000000..af52bff
--- /dev/null
+++ b/assets/index.html
@@ -0,0 +1,112 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>Spectre</title>
+
+    <link rel="stylesheet" href="sakura.css"/>
+    <script src="wasm.js"></script>
+    <script defer>
+        const go = new Go();
+        WebAssembly.instantiateStreaming(fetch("spectre.wasm"), go.importObject).then((result) => {
+            go.run(result.instance);
+
+            const $title = document.getElementById("title");
+            const $subtitle = document.getElementById("subtitle");
+            const $username = document.getElementById("username");
+            const $secret = document.getElementById("secret");
+            const $counter = document.getElementById("counter");
+            const $scope = document.getElementById("scope");
+            const $template = document.getElementById("template");
+            const $site = document.getElementById("site");
+            const $password = document.getElementById("password");
+
+            // Warning for non-default scoper
+            if (!defaultScoper) {
+                $title.innerText = `${$title.innerText}⚠`;
+                $subtitle.innerText = "This instance is not using the default scoper"
+            }
+
+            // Default scope template
+            $scope.addEventListener("change", () => {
+                let tmpl;
+                switch ($scope.value) {
+                    case "a":
+                        tmpl = "long";
+                        break;
+                    case "i":
+                        tmpl = "name";
+                        break;
+                    case "r":
+                        tmpl = "phrase";
+                        break;
+                }
+                $template.value = tmpl;
+            });
+
+            // Generate spectre
+            let s;
+            async function checkSpectre() {
+                if ($username.value === "" || $secret.value === "") return;
+                s = spectre($username.value, $secret.value);
+            }
+            $username.addEventListener("change", () => checkSpectre(), false);
+            $secret.addEventListener("change", () => checkSpectre(), false);
+
+            // Generate password
+            function checkPassword() {
+                if ($username.value === "" || $secret.value === "" || $site.value === "") return;
+                // Site(site, counter, scope, template)
+                $password.innerText = s.Site($site.value, parseInt($counter.value), $scope.value, $template.value);
+            }
+            $counter.addEventListener("change", checkPassword, false);
+            $scope.addEventListener("change", checkPassword, false);
+            $template.addEventListener("change", checkPassword, false);
+            $site.addEventListener("change", checkPassword, false);
+        });
+    </script>
+</head>
+<body>
+<h1 id="title">Spectre</h1>
+<small id="subtitle"></small>
+
+<hr/>
+
+<label for="username">Username</label>
+<input id="username" type="text" placeholder="Robert Lee Mitchell"/>
+
+<label for="secret">Secret</label>
+<input id="secret" type="password" placeholder="banana colored duckling"/>
+
+<label for="counter">Counter</label>
+<input id="counter" type="number" value="1" min="1"/>
+
+<label for="scope">Scope</label>
+<select id="scope">
+    <option value="a">Authentication</option>
+    <option value="i">Identification</option>
+    <option value="r">Recovery</option>
+</select>
+
+<label for="template">Template</label>
+<select id="template">
+    <option value="max">Maximum</option>
+    <option value="long" selected>Long</option>
+    <option value="med">Medium</option>
+    <option value="short">Short</option>
+    <option value="pin">Pin</option>
+    <option value="name">Name</option>
+    <option value="phrase">Phrase</option>
+    <option value="basic">Basic</option>
+</select>
+
+<label for="site">Site</label>
+<input id="site" type="text" placeholder="twitter.com"/>
+
+<hr/>
+
+<label for="password">Password</label>
+<pre id="password"></pre>
+
+</body>
+</html>
\ No newline at end of file
diff --git a/assets/sakura.css b/assets/sakura.css
new file mode 100644
index 0000000..817b45c
--- /dev/null
+++ b/assets/sakura.css
@@ -0,0 +1,249 @@
+/* Sakura.css v1.3.1
+ * ================
+ * Minimal css theme.
+ * Project: https://github.com/oxalorg/sakura/
+ */
+
+/* Default Sakura Theme */
+:root {
+    --color-blossom: #1d7484;
+    --color-fade: #982c61;
+    --color-bg: #f9f9f9;
+    --color-bg-alt: #f1f1f1;
+    --color-text: #4a4a4a;
+}
+
+/* Sakura Dark Theme */
+@media (prefers-color-scheme: dark) {
+    :root {
+        --color-blossom: #ffffff;
+        --color-fade: #c9c9c9;
+        --color-bg: #222222;
+        --color-bg-alt: #4a4a4a;
+        --color-text: #c9c9c9;
+    }
+}
+
+html {
+    font-size: 62.5%;
+    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
+}
+
+body {
+    font-size: 1.8rem;
+    line-height: 1.618;
+    max-width: 38em;
+    margin: auto;
+    color: var(--color-text);
+    background-color: var(--color-bg);
+    padding: 13px;
+}
+
+@media (max-width: 684px) {
+    body {
+        font-size: 1.53rem;
+    }
+}
+
+@media (max-width: 382px) {
+    body {
+        font-size: 1.35rem;
+    }
+}
+
+h1, h2, h3, h4, h5, h6 {
+    line-height: 1.1;
+    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
+    font-weight: 700;
+    margin-top: 3rem;
+    margin-bottom: 1.5rem;
+    overflow-wrap: break-word;
+    word-wrap: break-word;
+    -ms-word-break: break-all;
+    word-break: break-word;
+}
+
+h1 {
+    font-size: 2.35em;
+}
+
+h2 {
+    font-size: 2.00em;
+}
+
+h3 {
+    font-size: 1.75em;
+}
+
+h4 {
+    font-size: 1.5em;
+}
+
+h5 {
+    font-size: 1.25em;
+}
+
+h6 {
+    font-size: 1em;
+}
+
+p {
+    margin-top: 0px;
+    margin-bottom: 2.5rem;
+}
+
+small, sub, sup {
+    font-size: 75%;
+}
+
+hr {
+    border-color: var(--color-blossom);
+}
+
+a {
+    text-decoration: none;
+    color: var(--color-blossom);
+}
+
+a:hover {
+    color: var(--color-fade);
+    border-bottom: 2px solid var(--color-text);
+}
+
+a:visited {
+    color: var(--color-blossom);
+}
+
+ul {
+    padding-left: 1.4em;
+    margin-top: 0px;
+    margin-bottom: 2.5rem;
+}
+
+li {
+    margin-bottom: 0.4em;
+}
+
+blockquote {
+    margin-left: 0px;
+    margin-right: 0px;
+    padding-left: 1em;
+    padding-top: 0.8em;
+    padding-bottom: 0.8em;
+    padding-right: 0.8em;
+    border-left: 5px solid var(--color-blossom);
+    margin-bottom: 2.5rem;
+    background-color: var(--color-bg-alt);
+}
+
+blockquote p {
+    margin-bottom: 0;
+}
+
+img, video {
+    height: auto;
+    max-width: 100%;
+    margin-top: 0px;
+    margin-bottom: 2.5rem;
+}
+
+/* Pre and Code */
+pre {
+    background-color: var(--color-bg-alt);
+    display: block;
+    padding: 1em;
+    overflow-x: auto;
+    margin-top: 0px;
+    margin-bottom: 2.5rem;
+}
+
+code {
+    font-size: 0.9em;
+    padding: 0 0.5em;
+    background-color: var(--color-bg-alt);
+    white-space: pre-wrap;
+}
+
+pre > code {
+    padding: 0;
+    background-color: transparent;
+    white-space: pre;
+}
+
+/* Tables */
+table {
+    text-align: justify;
+    width: 100%;
+    border-collapse: collapse;
+}
+
+td, th {
+    padding: 0.5em;
+    border-bottom: 1px solid var(--color-bg-alt);
+}
+
+/* Buttons, forms and input */
+input, textarea {
+    border: 1px solid var(--color-text);
+}
+
+input:focus, textarea:focus {
+    border: 1px solid var(--color-blossom);
+}
+
+textarea {
+    width: 100%;
+}
+
+.button, button, input[type="submit"], input[type="reset"], input[type="button"] {
+    display: inline-block;
+    padding: 5px 10px;
+    text-align: center;
+    text-decoration: none;
+    white-space: nowrap;
+    background-color: var(--color-blossom);
+    color: var(--color-bg);
+    border-radius: 1px;
+    border: 1px solid var(--color-blossom);
+    cursor: pointer;
+    box-sizing: border-box;
+}
+
+.button[disabled], button[disabled], input[type="submit"][disabled], input[type="reset"][disabled], input[type="button"][disabled] {
+    cursor: default;
+    opacity: .5;
+}
+
+.button:focus:enabled, .button:hover:enabled, button:focus:enabled, button:hover:enabled, input[type="submit"]:focus:enabled, input[type="submit"]:hover:enabled, input[type="reset"]:focus:enabled, input[type="reset"]:hover:enabled, input[type="button"]:focus:enabled, input[type="button"]:hover:enabled {
+    background-color: var(--color-fade);
+    border-color: var(--color-fade);
+    color: var(--color-bg);
+    outline: 0;
+}
+
+textarea, select, input {
+    color: var(--color-text);
+    padding: 6px 10px;
+    /* The 6px vertically centers text on FF, ignored by Webkit */
+    margin-bottom: 10px;
+    background-color: var(--color-bg-alt);
+    border: 1px solid var(--color-bg-alt);
+    border-radius: 4px;
+    box-shadow: none;
+    box-sizing: border-box;
+}
+
+textarea:focus, select:focus, input:focus {
+    border: 1px solid var(--color-blossom);
+    outline: 0;
+}
+
+input[type="checkbox"]:focus {
+    outline: 1px dotted var(--color-blossom);
+}
+
+label, legend, fieldset {
+    display: block;
+    margin-bottom: .5rem;
+    font-weight: 600;
+}
\ No newline at end of file
diff --git a/assets/wasm.js b/assets/wasm.js
new file mode 100644
index 0000000..231185a
--- /dev/null
+++ b/assets/wasm.js
@@ -0,0 +1,629 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+(() => {
+	// Map multiple JavaScript environments to a single common API,
+	// preferring web standards over Node.js API.
+	//
+	// Environments considered:
+	// - Browsers
+	// - Node.js
+	// - Electron
+	// - Parcel
+	// - Webpack
+
+	if (typeof global !== "undefined") {
+		// global already exists
+	} else if (typeof window !== "undefined") {
+		window.global = window;
+	} else if (typeof self !== "undefined") {
+		self.global = self;
+	} else {
+		throw new Error("cannot export Go (neither global, window nor self is defined)");
+	}
+
+	if (!global.require && typeof require !== "undefined") {
+		global.require = require;
+	}
+
+	if (!global.fs && global.require) {
+		const fs = require("fs");
+		if (typeof fs === "object" && fs !== null && Object.keys(fs).length !== 0) {
+			global.fs = fs;
+		}
+	}
+
+	const enosys = () => {
+		const err = new Error("not implemented");
+		err.code = "ENOSYS";
+		return err;
+	};
+
+	if (!global.fs) {
+		let outputBuf = "";
+		global.fs = {
+			constants: { O_WRONLY: -1, O_RDWR: -1, O_CREAT: -1, O_TRUNC: -1, O_APPEND: -1, O_EXCL: -1 }, // unused
+			writeSync(fd, buf) {
+				outputBuf += decoder.decode(buf);
+				const nl = outputBuf.lastIndexOf("\n");
+				if (nl != -1) {
+					console.log(outputBuf.substr(0, nl));
+					outputBuf = outputBuf.substr(nl + 1);
+				}
+				return buf.length;
+			},
+			write(fd, buf, offset, length, position, callback) {
+				if (offset !== 0 || length !== buf.length || position !== null) {
+					callback(enosys());
+					return;
+				}
+				const n = this.writeSync(fd, buf);
+				callback(null, n);
+			},
+			chmod(path, mode, callback) { callback(enosys()); },
+			chown(path, uid, gid, callback) { callback(enosys()); },
+			close(fd, callback) { callback(enosys()); },
+			fchmod(fd, mode, callback) { callback(enosys()); },
+			fchown(fd, uid, gid, callback) { callback(enosys()); },
+			fstat(fd, callback) { callback(enosys()); },
+			fsync(fd, callback) { callback(null); },
+			ftruncate(fd, length, callback) { callback(enosys()); },
+			lchown(path, uid, gid, callback) { callback(enosys()); },
+			link(path, link, callback) { callback(enosys()); },
+			lstat(path, callback) { callback(enosys()); },
+			mkdir(path, perm, callback) { callback(enosys()); },
+			open(path, flags, mode, callback) { callback(enosys()); },
+			read(fd, buffer, offset, length, position, callback) { callback(enosys()); },
+			readdir(path, callback) { callback(enosys()); },
+			readlink(path, callback) { callback(enosys()); },
+			rename(from, to, callback) { callback(enosys()); },
+			rmdir(path, callback) { callback(enosys()); },
+			stat(path, callback) { callback(enosys()); },
+			symlink(path, link, callback) { callback(enosys()); },
+			truncate(path, length, callback) { callback(enosys()); },
+			unlink(path, callback) { callback(enosys()); },
+			utimes(path, atime, mtime, callback) { callback(enosys()); },
+		};
+	}
+
+	if (!global.process) {
+		global.process = {
+			getuid() { return -1; },
+			getgid() { return -1; },
+			geteuid() { return -1; },
+			getegid() { return -1; },
+			getgroups() { throw enosys(); },
+			pid: -1,
+			ppid: -1,
+			umask() { throw enosys(); },
+			cwd() { throw enosys(); },
+			chdir() { throw enosys(); },
+		}
+	}
+
+	if (!global.crypto && global.require) {
+		const nodeCrypto = require("crypto");
+		global.crypto = {
+			getRandomValues(b) {
+				nodeCrypto.randomFillSync(b);
+			},
+		};
+	}
+	if (!global.crypto) {
+		throw new Error("global.crypto is not available, polyfill required (getRandomValues only)");
+	}
+
+	if (!global.performance) {
+		global.performance = {
+			now() {
+				const [sec, nsec] = process.hrtime();
+				return sec * 1000 + nsec / 1000000;
+			},
+		};
+	}
+
+	if (!global.TextEncoder && global.require) {
+		global.TextEncoder = require("util").TextEncoder;
+	}
+	if (!global.TextEncoder) {
+		throw new Error("global.TextEncoder is not available, polyfill required");
+	}
+
+	if (!global.TextDecoder && global.require) {
+		global.TextDecoder = require("util").TextDecoder;
+	}
+	if (!global.TextDecoder) {
+		throw new Error("global.TextDecoder is not available, polyfill required");
+	}
+
+	// End of polyfills for common API.
+
+	const encoder = new TextEncoder("utf-8");
+	const decoder = new TextDecoder("utf-8");
+
+	global.Go = class {
+		constructor() {
+			this.argv = ["js"];
+			this.env = {};
+			this.exit = (code) => {
+				if (code !== 0) {
+					console.warn("exit code:", code);
+				}
+			};
+			this._exitPromise = new Promise((resolve) => {
+				this._resolveExitPromise = resolve;
+			});
+			this._pendingEvent = null;
+			this._scheduledTimeouts = new Map();
+			this._nextCallbackTimeoutID = 1;
+
+			const setInt64 = (addr, v) => {
+				this.mem.setUint32(addr + 0, v, true);
+				this.mem.setUint32(addr + 4, Math.floor(v / 4294967296), true);
+			}
+
+			const getInt64 = (addr) => {
+				const low = this.mem.getUint32(addr + 0, true);
+				const high = this.mem.getInt32(addr + 4, true);
+				return low + high * 4294967296;
+			}
+
+			const loadValue = (addr) => {
+				const f = this.mem.getFloat64(addr, true);
+				if (f === 0) {
+					return undefined;
+				}
+				if (!isNaN(f)) {
+					return f;
+				}
+
+				const id = this.mem.getUint32(addr, true);
+				return this._values[id];
+			}
+
+			const storeValue = (addr, v) => {
+				const nanHead = 0x7FF80000;
+
+				if (typeof v === "number" && v !== 0) {
+					if (isNaN(v)) {
+						this.mem.setUint32(addr + 4, nanHead, true);
+						this.mem.setUint32(addr, 0, true);
+						return;
+					}
+					this.mem.setFloat64(addr, v, true);
+					return;
+				}
+
+				if (v === undefined) {
+					this.mem.setFloat64(addr, 0, true);
+					return;
+				}
+
+				let id = this._ids.get(v);
+				if (id === undefined) {
+					id = this._idPool.pop();
+					if (id === undefined) {
+						id = this._values.length;
+					}
+					this._values[id] = v;
+					this._goRefCounts[id] = 0;
+					this._ids.set(v, id);
+				}
+				this._goRefCounts[id]++;
+				let typeFlag = 0;
+				switch (typeof v) {
+					case "object":
+						if (v !== null) {
+							typeFlag = 1;
+						}
+						break;
+					case "string":
+						typeFlag = 2;
+						break;
+					case "symbol":
+						typeFlag = 3;
+						break;
+					case "function":
+						typeFlag = 4;
+						break;
+				}
+				this.mem.setUint32(addr + 4, nanHead | typeFlag, true);
+				this.mem.setUint32(addr, id, true);
+			}
+
+			const loadSlice = (addr) => {
+				const array = getInt64(addr + 0);
+				const len = getInt64(addr + 8);
+				return new Uint8Array(this._inst.exports.mem.buffer, array, len);
+			}
+
+			const loadSliceOfValues = (addr) => {
+				const array = getInt64(addr + 0);
+				const len = getInt64(addr + 8);
+				const a = new Array(len);
+				for (let i = 0; i < len; i++) {
+					a[i] = loadValue(array + i * 8);
+				}
+				return a;
+			}
+
+			const loadString = (addr) => {
+				const saddr = getInt64(addr + 0);
+				const len = getInt64(addr + 8);
+				return decoder.decode(new DataView(this._inst.exports.mem.buffer, saddr, len));
+			}
+
+			const timeOrigin = Date.now() - performance.now();
+			this.importObject = {
+				go: {
+					// Go's SP does not change as long as no Go code is running. Some operations (e.g. calls, getters and setters)
+					// may synchronously trigger a Go event handler. This makes Go code get executed in the middle of the imported
+					// function. A goroutine can switch to a new stack if the current stack is too small (see morestack function).
+					// This changes the SP, thus we have to update the SP used by the imported function.
+
+					// func wasmExit(code int32)
+					"runtime.wasmExit": (sp) => {
+						sp >>>= 0;
+						const code = this.mem.getInt32(sp + 8, true);
+						this.exited = true;
+						delete this._inst;
+						delete this._values;
+						delete this._goRefCounts;
+						delete this._ids;
+						delete this._idPool;
+						this.exit(code);
+					},
+
+					// func wasmWrite(fd uintptr, p unsafe.Pointer, n int32)
+					"runtime.wasmWrite": (sp) => {
+						sp >>>= 0;
+						const fd = getInt64(sp + 8);
+						const p = getInt64(sp + 16);
+						const n = this.mem.getInt32(sp + 24, true);
+						fs.writeSync(fd, new Uint8Array(this._inst.exports.mem.buffer, p, n));
+					},
+
+					// func resetMemoryDataView()
+					"runtime.resetMemoryDataView": (sp) => {
+						sp >>>= 0;
+						this.mem = new DataView(this._inst.exports.mem.buffer);
+					},
+
+					// func nanotime1() int64
+					"runtime.nanotime1": (sp) => {
+						sp >>>= 0;
+						setInt64(sp + 8, (timeOrigin + performance.now()) * 1000000);
+					},
+
+					// func walltime() (sec int64, nsec int32)
+					"runtime.walltime": (sp) => {
+						sp >>>= 0;
+						const msec = (new Date).getTime();
+						setInt64(sp + 8, msec / 1000);
+						this.mem.setInt32(sp + 16, (msec % 1000) * 1000000, true);
+					},
+
+					// func scheduleTimeoutEvent(delay int64) int32
+					"runtime.scheduleTimeoutEvent": (sp) => {
+						sp >>>= 0;
+						const id = this._nextCallbackTimeoutID;
+						this._nextCallbackTimeoutID++;
+						this._scheduledTimeouts.set(id, setTimeout(
+							() => {
+								this._resume();
+								while (this._scheduledTimeouts.has(id)) {
+									// for some reason Go failed to register the timeout event, log and try again
+									// (temporary workaround for https://github.com/golang/go/issues/28975)
+									console.warn("scheduleTimeoutEvent: missed timeout event");
+									this._resume();
+								}
+							},
+							getInt64(sp + 8) + 1, // setTimeout has been seen to fire up to 1 millisecond early
+						));
+						this.mem.setInt32(sp + 16, id, true);
+					},
+
+					// func clearTimeoutEvent(id int32)
+					"runtime.clearTimeoutEvent": (sp) => {
+						sp >>>= 0;
+						const id = this.mem.getInt32(sp + 8, true);
+						clearTimeout(this._scheduledTimeouts.get(id));
+						this._scheduledTimeouts.delete(id);
+					},
+
+					// func getRandomData(r []byte)
+					"runtime.getRandomData": (sp) => {
+						sp >>>= 0;
+						crypto.getRandomValues(loadSlice(sp + 8));
+					},
+
+					// func finalizeRef(v ref)
+					"syscall/js.finalizeRef": (sp) => {
+						sp >>>= 0;
+						const id = this.mem.getUint32(sp + 8, true);
+						this._goRefCounts[id]--;
+						if (this._goRefCounts[id] === 0) {
+							const v = this._values[id];
+							this._values[id] = null;
+							this._ids.delete(v);
+							this._idPool.push(id);
+						}
+					},
+
+					// func stringVal(value string) ref
+					"syscall/js.stringVal": (sp) => {
+						sp >>>= 0;
+						storeValue(sp + 24, loadString(sp + 8));
+					},
+
+					// func valueGet(v ref, p string) ref
+					"syscall/js.valueGet": (sp) => {
+						sp >>>= 0;
+						const result = Reflect.get(loadValue(sp + 8), loadString(sp + 16));
+						sp = this._inst.exports.getsp() >>> 0; // see comment above
+						storeValue(sp + 32, result);
+					},
+
+					// func valueSet(v ref, p string, x ref)
+					"syscall/js.valueSet": (sp) => {
+						sp >>>= 0;
+						Reflect.set(loadValue(sp + 8), loadString(sp + 16), loadValue(sp + 32));
+					},
+
+					// func valueDelete(v ref, p string)
+					"syscall/js.valueDelete": (sp) => {
+						sp >>>= 0;
+						Reflect.deleteProperty(loadValue(sp + 8), loadString(sp + 16));
+					},
+
+					// func valueIndex(v ref, i int) ref
+					"syscall/js.valueIndex": (sp) => {
+						sp >>>= 0;
+						storeValue(sp + 24, Reflect.get(loadValue(sp + 8), getInt64(sp + 16)));
+					},
+
+					// valueSetIndex(v ref, i int, x ref)
+					"syscall/js.valueSetIndex": (sp) => {
+						sp >>>= 0;
+						Reflect.set(loadValue(sp + 8), getInt64(sp + 16), loadValue(sp + 24));
+					},
+
+					// func valueCall(v ref, m string, args []ref) (ref, bool)
+					"syscall/js.valueCall": (sp) => {
+						sp >>>= 0;
+						try {
+							const v = loadValue(sp + 8);
+							const m = Reflect.get(v, loadString(sp + 16));
+							const args = loadSliceOfValues(sp + 32);
+							const result = Reflect.apply(m, v, args);
+							sp = this._inst.exports.getsp() >>> 0; // see comment above
+							storeValue(sp + 56, result);
+							this.mem.setUint8(sp + 64, 1);
+						} catch (err) {
+							sp = this._inst.exports.getsp() >>> 0; // see comment above
+							storeValue(sp + 56, err);
+							this.mem.setUint8(sp + 64, 0);
+						}
+					},
+
+					// func valueInvoke(v ref, args []ref) (ref, bool)
+					"syscall/js.valueInvoke": (sp) => {
+						sp >>>= 0;
+						try {
+							const v = loadValue(sp + 8);
+							const args = loadSliceOfValues(sp + 16);
+							const result = Reflect.apply(v, undefined, args);
+							sp = this._inst.exports.getsp() >>> 0; // see comment above
+							storeValue(sp + 40, result);
+							this.mem.setUint8(sp + 48, 1);
+						} catch (err) {
+							sp = this._inst.exports.getsp() >>> 0; // see comment above
+							storeValue(sp + 40, err);
+							this.mem.setUint8(sp + 48, 0);
+						}
+					},
+
+					// func valueNew(v ref, args []ref) (ref, bool)
+					"syscall/js.valueNew": (sp) => {
+						sp >>>= 0;
+						try {
+							const v = loadValue(sp + 8);
+							const args = loadSliceOfValues(sp + 16);
+							const result = Reflect.construct(v, args);
+							sp = this._inst.exports.getsp() >>> 0; // see comment above
+							storeValue(sp + 40, result);
+							this.mem.setUint8(sp + 48, 1);
+						} catch (err) {
+							sp = this._inst.exports.getsp() >>> 0; // see comment above
+							storeValue(sp + 40, err);
+							this.mem.setUint8(sp + 48, 0);
+						}
+					},
+
+					// func valueLength(v ref) int
+					"syscall/js.valueLength": (sp) => {
+						sp >>>= 0;
+						setInt64(sp + 16, parseInt(loadValue(sp + 8).length));
+					},
+
+					// valuePrepareString(v ref) (ref, int)
+					"syscall/js.valuePrepareString": (sp) => {
+						sp >>>= 0;
+						const str = encoder.encode(String(loadValue(sp + 8)));
+						storeValue(sp + 16, str);
+						setInt64(sp + 24, str.length);
+					},
+
+					// valueLoadString(v ref, b []byte)
+					"syscall/js.valueLoadString": (sp) => {
+						sp >>>= 0;
+						const str = loadValue(sp + 8);
+						loadSlice(sp + 16).set(str);
+					},
+
+					// func valueInstanceOf(v ref, t ref) bool
+					"syscall/js.valueInstanceOf": (sp) => {
+						sp >>>= 0;
+						this.mem.setUint8(sp + 24, (loadValue(sp + 8) instanceof loadValue(sp + 16)) ? 1 : 0);
+					},
+
+					// func copyBytesToGo(dst []byte, src ref) (int, bool)
+					"syscall/js.copyBytesToGo": (sp) => {
+						sp >>>= 0;
+						const dst = loadSlice(sp + 8);
+						const src = loadValue(sp + 32);
+						if (!(src instanceof Uint8Array || src instanceof Uint8ClampedArray)) {
+							this.mem.setUint8(sp + 48, 0);
+							return;
+						}
+						const toCopy = src.subarray(0, dst.length);
+						dst.set(toCopy);
+						setInt64(sp + 40, toCopy.length);
+						this.mem.setUint8(sp + 48, 1);
+					},
+
+					// func copyBytesToJS(dst ref, src []byte) (int, bool)
+					"syscall/js.copyBytesToJS": (sp) => {
+						sp >>>= 0;
+						const dst = loadValue(sp + 8);
+						const src = loadSlice(sp + 16);
+						if (!(dst instanceof Uint8Array || dst instanceof Uint8ClampedArray)) {
+							this.mem.setUint8(sp + 48, 0);
+							return;
+						}
+						const toCopy = src.subarray(0, dst.length);
+						dst.set(toCopy);
+						setInt64(sp + 40, toCopy.length);
+						this.mem.setUint8(sp + 48, 1);
+					},
+
+					"debug": (value) => {
+						console.log(value);
+					},
+				}
+			};
+		}
+
+		async run(instance) {
+			if (!(instance instanceof WebAssembly.Instance)) {
+				throw new Error("Go.run: WebAssembly.Instance expected");
+			}
+			this._inst = instance;
+			this.mem = new DataView(this._inst.exports.mem.buffer);
+			this._values = [ // JS values that Go currently has references to, indexed by reference id
+				NaN,
+				0,
+				null,
+				true,
+				false,
+				global,
+				this,
+			];
+			this._goRefCounts = new Array(this._values.length).fill(Infinity); // number of references that Go has to a JS value, indexed by reference id
+			this._ids = new Map([ // mapping from JS values to reference ids
+				[0, 1],
+				[null, 2],
+				[true, 3],
+				[false, 4],
+				[global, 5],
+				[this, 6],
+			]);
+			this._idPool = [];   // unused ids that have been garbage collected
+			this.exited = false; // whether the Go program has exited
+
+			// Pass command line arguments and environment variables to WebAssembly by writing them to the linear memory.
+			let offset = 4096;
+
+			const strPtr = (str) => {
+				const ptr = offset;
+				const bytes = encoder.encode(str + "\0");
+				new Uint8Array(this.mem.buffer, offset, bytes.length).set(bytes);
+				offset += bytes.length;
+				if (offset % 8 !== 0) {
+					offset += 8 - (offset % 8);
+				}
+				return ptr;
+			};
+
+			const argc = this.argv.length;
+
+			const argvPtrs = [];
+			this.argv.forEach((arg) => {
+				argvPtrs.push(strPtr(arg));
+			});
+			argvPtrs.push(0);
+
+			const keys = Object.keys(this.env).sort();
+			keys.forEach((key) => {
+				argvPtrs.push(strPtr(`${key}=${this.env[key]}`));
+			});
+			argvPtrs.push(0);
+
+			const argv = offset;
+			argvPtrs.forEach((ptr) => {
+				this.mem.setUint32(offset, ptr, true);
+				this.mem.setUint32(offset + 4, 0, true);
+				offset += 8;
+			});
+
+			this._inst.exports.run(argc, argv);
+			if (this.exited) {
+				this._resolveExitPromise();
+			}
+			await this._exitPromise;
+		}
+
+		_resume() {
+			if (this.exited) {
+				throw new Error("Go program has already exited");
+			}
+			this._inst.exports.resume();
+			if (this.exited) {
+				this._resolveExitPromise();
+			}
+		}
+
+		_makeFuncWrapper(id) {
+			const go = this;
+			return function () {
+				const event = { id: id, this: this, args: arguments };
+				go._pendingEvent = event;
+				go._resume();
+				return event.result;
+			};
+		}
+	}
+
+	if (
+		typeof module !== "undefined" &&
+		global.require &&
+		global.require.main === module &&
+		global.process &&
+		global.process.versions &&
+		!global.process.versions.electron
+	) {
+		if (process.argv.length < 3) {
+			console.error("usage: go_js_wasm_exec [wasm binary] [arguments]");
+			process.exit(1);
+		}
+
+		const go = new Go();
+		go.argv = process.argv.slice(2);
+		go.env = Object.assign({ TMPDIR: require("os").tmpdir() }, process.env);
+		go.exit = process.exit;
+		WebAssembly.instantiate(fs.readFileSync(process.argv[2]), go.importObject).then((result) => {
+			process.on("exit", (code) => { // Node.js exits if no event handler is pending
+				if (code === 0 && !go.exited) {
+					// deadlock, make Go print error and stack traces
+					go._pendingEvent = { id: 0 };
+					go._resume();
+				}
+			});
+			return go.run(result.instance);
+		}).catch((err) => {
+			console.error(err);
+			process.exit(1);
+		});
+	}
+})();
diff --git a/cmd/pwa-spectre/main.go b/cmd/pwa-spectre/main.go
new file mode 100644
index 0000000..6739ca4
--- /dev/null
+++ b/cmd/pwa-spectre/main.go
@@ -0,0 +1,18 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"net/http"
+
+	"go.jolheiser.com/pwa-spectre/assets"
+)
+
+func main() {
+	portFlag := flag.Int("port", 9276, "port to listen on")
+	flag.Parse()
+
+	http.Handle("/", http.FileServer(http.FS(assets.Assets)))
+	fmt.Printf("http://localhost:%d\n", *portFlag)
+	http.ListenAndServe(fmt.Sprintf(":%d", *portFlag), nil)
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..4c69279
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,7 @@
+module go.jolheiser.com/pwa-spectre
+
+go 1.17
+
+require go.jolheiser.com/go-spectre v0.1.1
+
+require golang.org/x/crypto v0.0.0-20211108221036-ceb1ce70b4fa // indirect
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..38190ab
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,10 @@
+go.jolheiser.com/go-spectre v0.1.1 h1:TG9RhwOVH9PAamKdRBnObaudPZukOsk/ETh/knbgtww=
+go.jolheiser.com/go-spectre v0.1.1/go.mod h1:YK9aGekEK8H5rNnnqVbwLFs9AWBeFl23PwjTD8wfdP4=
+golang.org/x/crypto v0.0.0-20211108221036-ceb1ce70b4fa h1:idItI2DDfCokpg0N51B2VtiLdJ4vAuXC9fnCb2gACo4=
+golang.org/x/crypto v0.0.0-20211108221036-ceb1ce70b4fa/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
+golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
+golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
+golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
diff --git a/wasm/wasm.go b/wasm/wasm.go
new file mode 100644
index 0000000..454d4ce
--- /dev/null
+++ b/wasm/wasm.go
@@ -0,0 +1,64 @@
+package main
+
+import (
+	"fmt"
+	"syscall/js"
+
+	"go.jolheiser.com/go-spectre"
+)
+
+const defaultScoper = "com.lyndir.masterpassword"
+
+var Scoper string
+
+//go:generate go build -ldflags "-X 'main.Scoper=$PWA_SPECTRE_SCOPER'" -o ../assets/spectre.wasm
+func main() {
+	if Scoper == "" {
+		Scoper = defaultScoper
+	}
+	scoper := spectre.SimpleScoper{
+		Key: Scoper,
+	}
+	js.Global().Set("spectre", spectreWrapper(scoper))
+	js.Global().Set("defaultScoper", Scoper == defaultScoper)
+	fmt.Println("Spectre Init")
+	<-make(chan struct{})
+}
+
+func spectreWrapper(scoper spectre.Scoper) js.Func {
+	spectreFunc := js.FuncOf(func(this js.Value, args []js.Value) interface{} {
+		if len(args) != 2 {
+			return "Invalid number of arguments"
+		}
+
+		s, err := spectre.New(args[0].String(), args[1].String(), spectre.WithScoper(scoper))
+		if err != nil {
+			return err.Error()
+		}
+		return map[string]interface{}{
+			// Site(site, counter, scope, template)
+			"Site": js.FuncOf(func(this js.Value, args []js.Value) interface{} {
+				if len(args) != 4 {
+					return "Invalid number of arguments"
+				}
+
+				scope, err := spectre.ParseScope(args[2].String())
+				if err != nil {
+					return err.Error()
+				}
+
+				template, err := spectre.ParseTemplate(args[3].String())
+				if err != nil {
+					return err.Error()
+				}
+
+				return s.Site(args[0].String(),
+					spectre.WithCounter(args[1].Int()),
+					spectre.WithScope(scope),
+					spectre.WithTemplate(template),
+				)
+			}),
+		}
+	})
+	return spectreFunc
+}