MPC-Notes/garbled-circuit.html at main · LCamel/MPC-Notes · GitHub

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<html>
<body>
<style>
    body {
        background-color: black;
        color: white;
    }
    .container {
        font-family: 'Courier New', Courier, monospace;
        font-size: 20px;
        position: relative; /* for its "absolute" child */
        white-space: pre; /* mind the spaces in the html */
    }
    .overlay {
        z-index: 1;
        position: absolute;
        top: 0px;
        left: 0px;
    }
    .btn {
        height: 1lh;
        position: absolute;
        background-color: #404040;
        cursor: pointer;
        transition: background-color 0.1s ease;
    }
    .btn:active {
        background-color: black;
    }
    .txt {
        height: 1lh;
        position: absolute;
    }
    .hide {
        display: none;
    }
    .blinking-border {
        animation: blink-border 1.2s steps(1, end) forwards;
        z-index: 2;
    }
    @keyframes blink-border {
        0%, 40%, 80% { outline: 2px solid white; }
        20%, 60%, 100% { outline: none; }
    }
    .protoTxt {
        background: rgba(0, 0, 0, 0.3); /* for the overlapping parts */
    }
</style>
<!-- mind the spaces -->
<div class="container"><div class="board" id="board">
            #message                                             #PTR

            ┌────────────────────┐
            │                    │
    !L00!L01│         AND        │
    !S0#0_──┤                    │
            │   @0@1  #DSP00     │!L20!L21
            │         #DSP01  @2_├───┐
    !L10!L11│         #DSP02     │   │  ┌────────────────────┐
 @S1@v1@1_──┤         #DSP03     │   │  │                    │
       @OT1 │    @ROW0      @E0  │   └──┤         XOR        │   #L60 0
            │                    │      │                    │   #L61 1
            └────────────────────┘      │   @2@5  #DSP20     │
                                        │         #DSP21  @6_├── @6  @FIN
            ┌────────────────────┐      │         #DSP22     │
            │                    │      │         #DSP23     │
    !L30!L31│         OR         │   ┌──┤    @ROW2      @E2  │
    !S3#3_──┤                    │   │  │                    │
            │   @3@4  #DSP10     │   │  └────────────────────┘
            │         #DSP11  @5_├───┘
    !L40!L41│         #DSP12     │!L50!L51   !GL
 @S4@v4@4_──┤         #DSP13     │           !GT
       @OT4 │    @ROW1      @E1  │           !RT
            │                    │           !ET
            └────────────────────┘           !SI
                                             !SEND
</div>
<div class="overlay">
<div class="btn protoBtn" style="top: -1000lh; left: -1000ch">B</div>
<div class="txt protoTxt" style="top: -1000lh; left: -1001ch">T</div>
</div>
</div>
<script>
function parseBoard(s) {
    var locations = {};
    var symbols = {};
    var row = 0;
    var col = 0;
    var regex = /(.*?)([!@#])(\w+)/gs;
    var replaced = s.replace(regex, (all, before, symbol, name) => {
        var lines = before.split("\n");
        if (lines.length == 1) {
            col += lines[0].length;
        } else {
            row += lines.length - 1;
            col = lines.pop().length;
        }
        locations[name] = [row, col];
        symbols[name] = symbol;
        col += 1 + name.length;
        return before + " ".repeat(1 + name.length);
    });
    return [replaced, locations, symbols];
}
// https://en.wikipedia.org/wiki/Fisher%E2%80%93Yates_shuffle
function shuffle(arr) {
    for (var i = arr.length - 1; i != 0; i--) {
        var j = Math.floor(Math.random() * (i + 1));
        [arr[i], arr[j]] = [arr[j], arr[i]];
    }
    return arr;
}
// it's more "authentic" to remove the pointer bits in encryption
function noPTR(s) {
    return [...s].filter(c => !pointers.includes(c)).join('');
}
function encrypt(inLabel0, inLabel1, outLabel) {
    return `E,${noPTR(inLabel0)},${noPTR(inLabel1)},${outLabel}`;
}
function decrypt(inLabel0, inLabel1, ciphertext) {
    var prefix = `E,${noPTR(inLabel0)},${noPTR(inLabel1)},`;
    return ciphertext.startsWith(prefix) ? ciphertext.replace(prefix, "") : "";
}
var pointers = ['🔴', '🔵'];
function generateWireLabels() {
    labels = [
        [ '🐱', '🐶' ],
        [ '🐭', '🐰' ],
        [ '🐮', '🐴' ],
        [ '🐷', '🐏' ],
        [ '🐻', '🐵' ],
        [ '🦁', '🦊' ],
        [ '🐪', '🦙' ],
    ].map(twoLabels => shuffle(twoLabels));
    if (pointAndPermute) {
        labels.forEach((twoLabels) => {
            let p = shuffle(pointers.slice());
            twoLabels[0] += p[0];
            twoLabels[1] += p[1];
        });
    }
    console.log("labels: ", labels);
}
var gates = [
    ["AND", 0, 1, 2, (a, b) => a & b],
    ["OR", 3, 4, 5, (a, b) => a | b],
    ["XOR", 2, 5, 6, (a, b) => a ^ b]
];
function generateTable(in0Labels, in1Labels, outLabels, fn) {
    return [[0, 0], [0, 1], [1, 0], [1, 1]]
        .map(([v1, v2]) => [in0Labels[v1], in1Labels[v2], outLabels[fn(v1, v2)]]);
}
function generateTabels() {
    tables = gates.map(([name, in0, in1, out, fn]) => generateTable(labels[in0], labels[in1], labels[out], fn));
}
function sortTableRowsByPointers(t) {
    var pointers = ([l0, l1, _]) => [...l0].slice(-1) + [...l1].slice(-1);
    t.sort((rowA, rowB) => pointers(rowA).localeCompare(pointers(rowB)));
}
function reorderTables() {
    tables.forEach(!pointAndPermute ? shuffle : sortTableRowsByPointers);
}
function generateCiphertexts() {
    ciphertexts = tables.map(t => t.map(row => encrypt(...row)));
    console.log("generateCiphertexts: ", ciphertexts);
}
function setMessage(s) {
    message = s;
    blink("message", "black", 80);
}
var wires = ['', '', '', '', '', '', ''];
var labels = wires.map(_ => ['', '']);
var tables;
var ciphertexts;
var updaters = [];
var rowOfGate = [0, 0, 0];
var message = "";


var [board, loc, symbols] = parseBoard(document.querySelector("#board").innerText);
document.querySelector("#board").innerText = board;
console.log("loc: ", loc);
console.log("symbols: ", symbols);

function setRow(node, row) { node.style.top = row + "lh"; }
function setCol(node, col) { node.style.left = col + "ch"; }

function createNode(protoNodeSeletor, name, captionFn) {
    var protoNode = document.querySelector(protoNodeSeletor);
    var node = protoNode.cloneNode(true);
    //node.id = "id" + name; // for debugging only
    node.setAttribute("data-name", name); // divs don't have "name" attribute but can use "data-name"
    var symbolToClass = { "@": "evaluatorOnly", "!": "generatorOnly", "#": "both" };
    node.classList.add(symbolToClass[symbols[name]]);
    setRow(node, loc[name][0]);
    setCol(node, loc[name][1]);
    protoNode.parentNode.appendChild(node);
    updaters.push(() => node.innerText = captionFn());
    return node;
}

function Text(name, captionFn) {
    return createNode(".protoTxt", name, captionFn);
}
function Button(name, captionFn, listener) {
    var node = createNode(".protoBtn", name, captionFn);
    node.onclick = () => { listener(); updateUI(); };
    return node;
}
function updateUI() {
    updaters.forEach((u) => u());
}
function byName(name) {
    return document.querySelector(`[data-name="${name}"]`);
}
function blink(name, color, duration) {
    var node = byName(name);
    var origColor = node.style.color;
    node.style.color = color;
    setTimeout(() => node.style.color = origColor, duration);
}

Text("message", () => message);

for (let w = 0; w < wires.length; w++) { // wire labels and wires
    for (let v = 0; v < 2; v++) {
        Text("L" + w + v, () => labels[w][v]);
    }
    Text(`${w}`, () => wires[w]);
    Text(`${w}_`, () => wires[w]);
}
gates.forEach(([name, in0, in1, out, fn], g) => {
    Button(`ROW${g}`, () => "▼", () => { // row selectors
        rowOfGate[g] = (rowOfGate[g] + 1) % 4;
        setRow(byName(in0), loc["" + in0][0] + rowOfGate[g]);
        setRow(byName(in1), loc["" + in1][0] + rowOfGate[g]);
    });
    Button("E" + g, () => "►", () => { // eval
        let r = rowOfGate[g];
        if (plaintext = decrypt(wires[in0], wires[in1], ciphertexts[g][r])) {
            wires[out] = plaintext;
            setMessage(`Decrypted!  ${wires[in0]} ${name} ${wires[in1]} = ${wires[out]}`);
            display[g][r] = "";
        } else {
            setMessage("Decryption error: Invalid key.");
            shakeString(() => display[g][r], (v) => display[g][r] = v);
        }
    });
});

function shakeString(getter, setter) { // hacky, expensive
    var count = 4;
    var h = () => {
        setter(count % 2 == 0 ? " " + getter() : getter().substring(1));
        if (--count != 0) setTimeout(h, 80);
        updateUI();
    };
    setTimeout(h, 80);
}

function forEachDisplayIndex(fn) {
    for (let i = 0; i < 3; i++) {
        for (let j = 0; j < 4; j++) {
            fn(i, j);
        }
    }
}
function setDisplay(fn) { forEachDisplayIndex((i, j) => display[i][j] = fn(i, j)) }

var display = [['','','',''], ['','','',''], ['','','','']];
forEachDisplayIndex((i, j) => Text("DSP" + i + j, () => display[i][j]));

var inputValues = [0, 0,  , 0, 0,  ,  ]; // Generator wires: 0, 3  Evaluator wires: 1, 4
[1, 4].forEach(w => {
    Button(`S${w}`, () => "▼", () => inputValues[w] = 1 - inputValues[w]);
    Text(`v${w}`, () => inputValues[w]);
    Button(`OT${w}`, () => "►", () => {
        wires[w] = labels[w][inputValues[w]];
        setMessage(`Label of ${inputValues[w]} => ${wires[w]} (OT)`);
        byName(`S${w}`).classList.add("hide");
        byName(`OT${w}`).classList.add("hide");
    });
});

function displayTable() { setDisplay((i, j) => tables[i][j].join('')); }
Button("GL", () => "Generate Wire Labels", () => generateWireLabels());
Button("GT", () => "Generate Tables", () => {
    generateTabels();
    displayTable();
});
Button("RT", () => "Reorder Tables", () => {
    reorderTables();
    displayTable();
});
Button("ET", () => "Encrypt Tables", () => {
    generateCiphertexts();
    setDisplay((i, j) => "🔒🔒🧳");
})
Button("S0", () => "▼", () => { wires[0] = labels[0][inputValues[0]]; inputValues[0] = 1 - inputValues[0]; });
Button("S3", () => "▼", () => { wires[3] = labels[3][inputValues[3]]; inputValues[3] = 1 - inputValues[3]; });

Text("SI", () => "Select Inputs with ▼");
Button("SEND", () => "Send to the Evaluator", () => {
    if (wires[0] == '' || wires[3] == '') {
        setMessage("select both inputs for the generator");
        if (wires[0] == '') blink("S0", "black", 80);
        if (wires[3] == '') blink("S3", "black", 80);
        return;
    }
    setMessage("Garbled Circuit (Evaluator)");
    document.querySelectorAll(".generatorOnly").forEach(n => n.classList.add("hide"));
    document.querySelectorAll(".evaluatorOnly").forEach(n => n.classList.remove("hide"));
    byName("S1").classList.add("blinking-border");
});

Text("FIN", () => wires[6] == '' ? '' : '🎉🎉🎉');

Text("PTR", () => !pointAndPermute ? '' :
    pointers[0] + pointers[0] + "\n" + pointers[0] + pointers[1] + "\n"
    + pointers[1] + pointers[0] + "\n" + pointers[1] + pointers[1]);

// ?startFrom=evaluator&w0=1&w3=0&pointAndPermute=1
var params = new URLSearchParams(document.location.search);
var pointAndPermute = params.get("pointAndPermute") == 1;
if (params.get("startFrom") != "evaluator") {
    setMessage("Garbled Circuit (Generator)");
    document.querySelectorAll(".evaluatorOnly").forEach(n => n.classList.add("hide"));
    byName("GL").classList.add("blinking-border");
} else {
    setMessage("Garbled Circuit (Evaluator)");
    document.querySelectorAll(".generatorOnly").forEach(n => n.classList.add("hide"));
    generateWireLabels();
    generateTabels();
    reorderTables();
    generateCiphertexts();
    setDisplay((i, j) => "🔒🔒🧳");
    wires[0] = labels[0][params.get("w0") || 0]; // default input for the generator
    wires[3] = labels[3][params.get("w3") || 0]; // default input for the generator
    byName("S1").classList.add("blinking-border");
}
updateUI();
</script>
</body>
</html>