From 9a70f88a3eb2ec5b7143ada056ace745875e0909 Mon Sep 17 00:00:00 2001
From: Erik van `t Wout <erik@ewnetworks.eu>
Date: Fri, 4 Oct 2019 05:52:54 +0200
Subject: [PATCH] Initial commit

---
 ewpass.js           | 207 ++++++++++++++++++++++++++++++++++++++++++++
 index.html          |  72 +++++++++++++++
 jquery-3.4.1.min.js |   2 +
 sha256.js           |   4 +
 4 files changed, 285 insertions(+)
 create mode 100644 ewpass.js
 create mode 100644 index.html
 create mode 100644 jquery-3.4.1.min.js
 create mode 100644 sha256.js

diff --git a/ewpass.js b/ewpass.js
new file mode 100644
index 0000000..16b1b70
--- /dev/null
+++ b/ewpass.js
@@ -0,0 +1,207 @@
+var ewpass = {};
+
+(function(ns) {
+    const SEED_PREFIX = 'E. W. Password Generator Seed/';
+    const DERIVE_PREFIX = 'Domain Password/';
+    const Storage = window.localStorage;
+
+    const BASIC_MAP = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
+    const EXTENDED_MAP = BASIC_MAP + '`~!@#$%^&*()-_=+[{]}\\|;:\'",<.>/?';
+
+    var settings = {
+        'checksum': undefined,
+        'DEFAULT': [ 16, 1, true ],
+        'domains': {}
+    };
+    var currentDomain = undefined;
+    var seedValid = false;
+
+    var checkSeedChecksum = () => {
+        const valid = $('#checksum').text() === settings.checksum;
+
+        $('#chkok').html(valid ? '✓' : '✗');
+        $('#chkset').prop('disabled', valid ? 'disabled' : '');
+
+        seedValid = valid;
+    };
+
+    var setDomains = () => {
+        $domainlist = $("#domainlist")
+
+        $domainlist.html('');
+        for (domain in settings.domains) {
+            $domainlist.append($('<option>').attr('value', domain).text(domain));
+        }
+    };
+
+    var calcRounds = l => {
+        var m = 0xffffffff;
+        var n = 0;
+
+        while (m > 0) {
+            m = Math.floor(m / l);
+            n++;
+        }
+
+        return n;
+    };
+
+    ns.resetSeed = () => {
+        $('#seed').val('');
+        $('#seed').prop('disabled', '');
+        $('#checksum').text('-');
+        $('#chkok').text('');
+        $('#chkset').prop('disabled', 'disabled');
+
+        seedValid = false;
+
+        $('#seed').focus();
+    };
+
+    ns.calculateSeed = () => {
+        sha256(SEED_PREFIX + $('#seed').val()).then(hash => {
+            $('#seed').val(hash);
+            $('#seed').prop('disabled', 'disabled');
+            $('#checksum').text(hash.substring(0, 2));
+            checkSeedChecksum();
+        });
+    };
+
+    ns.storeSeedChecksum = () => {
+        settings.checksum = $('#checksum').text();
+        Storage.setItem('checksum', settings.checksum);
+        checkSeedChecksum();
+    };
+
+    ns.checkDomainInputMatchesToOption = () => {
+        var domain = $('#domain').val();
+        if (domain in settings.domains) {
+            ns.loadSettingsForDomain(domain);
+        }
+    };
+
+    ns.loadSettingsForDomain = (domain) => {
+        if (domain === undefined) {
+            ns.loadSettingsForDomain($('#domain').val());
+            return;
+        }
+
+        var _settings;
+
+        if (domain === '') {
+            $('#length').prop('disabled', 'disabled');
+            $('#iteration').prop('disabled', 'disabled');
+            $('#nextiter').prop('disabled', 'disabled');
+            $('#extended').prop('disabled', 'disabled');
+            $('#storedomain').prop('disabled', 'disabled');
+            $('#docopy').prop('disabled', 'disabled');
+
+            _settings = settings.DEFAULT;
+        } else if (domain in settings.domains) {
+            _settings = settings.domains[domain];
+        } else if (!confirm('Add new domain "' + domain + '" ?')) {
+            $('#domain').val('');
+            ns.loadSettingsForDomain('');
+            return;
+        } else {
+            settings.domains[domain] = settings.DEFAULT.slice();
+            setDomains();
+
+            _settings = settings.domains[domain];
+            Storage.setItem('domains', JSON.stringify(settings.domains));
+        }
+
+        $('#length').val(_settings[0]);
+        $('#iteration').val(_settings[1]);
+        $('#extended').prop('checked', _settings[2] ? 'checked' : '');
+
+        if (_settings !== settings.DEFAULT) {
+            $('#length').prop('disabled', '');
+            $('#iteration').prop('disabled', '');
+            $('#nextiter').prop('disabled', '');
+            $('#extended').prop('disabled', '');
+            $('#storedomain').prop('disabled', '');
+            $('#docopy').prop('disabled', '');
+
+            currentDomain = domain;
+        }
+    };
+
+    ns.storeSettingsForDomain = () => {
+        _settings = [
+            parseInt($('#length').val()),
+            parseInt($('#iteration').val()),
+            $('#extended').prop('checked')
+        ];
+
+        settings.domains[currentDomain] = _settings;
+        Storage.setItem('domains', JSON.stringify(settings.domains));
+    };
+
+    ns.nextIteration = () => {
+        $('#iteration').val(parseInt($('#iteration').val()) + 1);
+        ns.storeSettingsForDomain();
+    };
+
+    ns.deriveAndCopyToClipboard = () => {
+        if (!seedValid) {
+            alert('Enter master password first!');
+            ns.resetSeed();
+            return;
+        }
+
+        $docopy = $('#docopy');
+        $docopy.prop('disabled', 'disabled');
+
+        sha256(DERIVE_PREFIX + $('#seed').val() + '/' + settings.domains[currentDomain][1] + '/' + currentDomain).then(hash => {
+            const map = settings.domains[currentDomain][2] ? EXTENDED_MAP : BASIC_MAP;
+
+            const rounds = calcRounds(map.length);
+            var pw = '';
+
+            for (var i = 0; i < 8; i++) {
+                var x = parseInt(hash.substring(i * 8, (i+1) * 8), 16);
+                for (var j = 0; j < rounds; j++) {
+                    pw += map.substring(x % map.length, x % map.length + 1);
+                    x = Math.floor(x / map.length);
+                }
+            }
+
+            pw = pw.substring(0, settings.domains[currentDomain][0]);
+
+            navigator.clipboard.writeText(pw).then(() => {
+                $docopy.val('[ COPIED ]');
+                setInterval(() => {
+                    $docopy.val('Copy password');
+                    $docopy.prop('disabled', '');
+                }, 1500);
+            });
+        });
+    };
+
+    ns.setup = () => {
+        if (Storage.getItem('checksum') != null) {
+            settings.checksum = Storage.getItem('checksum');
+        }
+        if (Storage.getItem('domains') != null) {
+            settings.domains = JSON.parse(Storage.getItem('domains'));
+            console.debug('Loaded domains:', settings.domains);
+            setDomains();
+        }
+
+        var setupReturnEvent = (o, handler) => {
+            o.keypress((event, value) => {
+                if (event.which === 13) {
+                    handler(o.val());
+                }
+            });
+        };
+
+        setupReturnEvent($('#seed'), ns.calculateSeed);
+        setupReturnEvent($('#domain'), ns.loadSettingsForDomain);
+
+        ns.resetSeed();
+        ns.loadSettingsForDomain();
+    };
+
+})(ewpass);
diff --git a/index.html b/index.html
new file mode 100644
index 0000000..3ec2a38
--- /dev/null
+++ b/index.html
@@ -0,0 +1,72 @@
+<html>
+    <head>
+        <script language="javascript" src="./jquery-3.4.1.min.js"></script>
+        <script language="javascript" src="./sha256.js"></script>
+        <script language="javascript" src="./ewpass.js"></script>
+    </head>
+    <body onload="ewpass.setup();">
+        <center>
+            <table border="0" cellspacing="10">
+                <tr>
+                    <th>Master password: </th>
+                    <td>
+                        <table border="0" cellspacing="5">
+                            <tr>
+                                <td colspan="3">
+                                    <input type="password" id="seed" size="46" autocomplete="off" /> <input type="button" id="clearseed" value="Clear" onclick="ewpass.resetSeed();" />
+                                </td>
+                            </tr>
+                            <tr>
+                                <td>Checksum: </td>
+                                <td><span id="chkok"></span> <span id="checksum"></span></td>
+                                <td><input type="button" id="chkset" value="Set" onclick="ewpass.storeSeedChecksum();" /></td>
+                            </tr>
+                        </table>
+                    </td>
+                </tr>
+                <tr>
+                    <td>&nbsp;</td>
+                </tr>
+                <tr>
+                    <th>Domain: </th>
+                    <td><input id="domain" list="domainlist" autocomplete="off" onchange="ewpass.checkDomainInputMatchesToOption();" /><datalist id="domainlist"></datalist></td>
+                </tr>
+                <tr>
+                    <th>Options: </th>
+                    <td>
+                        <table border="0" cellspacing="2">
+                            <tr>
+                                <td>Length: </td>
+                                <td><input id="length" value="12" size="2" autocomplete="off" /></td>
+                            </tr>
+                            <tr>
+                                <td>Iteration: </td>
+                                <td><input id="iteration" value="1" size="2" autocomplete="off" /> <input type="button" id="nextiter" value="Next" onclick="ewpass.nextIteration();" /></td>
+                            </tr>
+                            <tr>
+                                <td colspan="2">
+                                    <label><input type="checkbox" id="extended" checked="checked" /> Use special characters</label>
+                                </td>
+                            </tr>
+                            <tr>
+                                <td colspan="2">
+                                    <input type="button" id="storedomain" value="Store" onclick="ewpass.storeSettingsForDomain();" />
+                                </td>
+                            </tr>
+                        </table>
+                    </td>
+                </tr>
+                <tr>
+                    <td>&nbsp;</td>
+                </tr>
+                <tr>
+                    <td colspan="2">
+                        <center>
+                            <input type="button" id="docopy" value="Copy password" onclick="ewpass.deriveAndCopyToClipboard();" />
+                        </center>
+                    </td>
+                </tr>
+            </table>
+        </center>
+    </body>
+</html>
diff --git a/jquery-3.4.1.min.js b/jquery-3.4.1.min.js
new file mode 100644
index 0000000..a1c07fd
--- /dev/null
+++ b/jquery-3.4.1.min.js
@@ -0,0 +1,2 @@
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diff --git a/sha256.js b/sha256.js
new file mode 100644
index 0000000..b139ecd
--- /dev/null
+++ b/sha256.js
@@ -0,0 +1,4 @@
+async function sha256(message) {
+    const hashBuffer = await crypto.subtle.digest('SHA-256', new TextEncoder('utf-8').encode(message));
+    return Array.from(new Uint8Array(hashBuffer)).map(b => ('00' + b.toString(16)).slice(-2)).join('');
+}