Make a squash

web/static/wireguard.js

@@ -0,0 +1,185 @@
+/*! SPDX-License-Identifier: GPL-2.0
+ *
+ * Copyright (C) 2015-2020 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
+ */
+
+(function() {
+	function gf(init) {
+		var r = new Float64Array(16);
+		if (init) {
+			for (var i = 0; i < init.length; ++i)
+				r[i] = init[i];
+		}
+		return r;
+	}
+
+	function pack(o, n) {
+		var b, m = gf(), t = gf();
+		for (var i = 0; i < 16; ++i)
+			t[i] = n[i];
+		carry(t);
+		carry(t);
+		carry(t);
+		for (var j = 0; j < 2; ++j) {
+			m[0] = t[0] - 0xffed;
+			for (var i = 1; i < 15; ++i) {
+				m[i] = t[i] - 0xffff - ((m[i - 1] >> 16) & 1);
+				m[i - 1] &= 0xffff;
+			}
+			m[15] = t[15] - 0x7fff - ((m[14] >> 16) & 1);
+			b = (m[15] >> 16) & 1;
+			m[14] &= 0xffff;
+			cswap(t, m, 1 - b);
+		}
+		for (var i = 0; i < 16; ++i) {
+			o[2 * i] = t[i] & 0xff;
+			o[2 * i + 1] = t[i] >> 8;
+		}
+	}
+
+	function carry(o) {
+		var c;
+		for (var i = 0; i < 16; ++i) {
+			o[(i + 1) % 16] += (i < 15 ? 1 : 38) * Math.floor(o[i] / 65536);
+			o[i] &= 0xffff;
+		}
+	}
+
+	function cswap(p, q, b) {
+		var t, c = ~(b - 1);
+		for (var i = 0; i < 16; ++i) {
+			t = c & (p[i] ^ q[i]);
+			p[i] ^= t;
+			q[i] ^= t;
+		}
+	}
+
+	function add(o, a, b) {
+		for (var i = 0; i < 16; ++i)
+			o[i] = (a[i] + b[i]) | 0;
+	}
+
+	function subtract(o, a, b) {
+		for (var i = 0; i < 16; ++i)
+			o[i] = (a[i] - b[i]) | 0;
+	}
+
+	function multmod(o, a, b) {
+		var t = new Float64Array(31);
+		for (var i = 0; i < 16; ++i) {
+			for (var j = 0; j < 16; ++j)
+				t[i + j] += a[i] * b[j];
+		}
+		for (var i = 0; i < 15; ++i)
+			t[i] += 38 * t[i + 16];
+		for (var i = 0; i < 16; ++i)
+			o[i] = t[i];
+		carry(o);
+		carry(o);
+	}
+
+	function invert(o, i) {
+		var c = gf();
+		for (var a = 0; a < 16; ++a)
+			c[a] = i[a];
+		for (var a = 253; a >= 0; --a) {
+			multmod(c, c, c);
+			if (a !== 2 && a !== 4)
+				multmod(c, c, i);
+		}
+		for (var a = 0; a < 16; ++a)
+			o[a] = c[a];
+	}
+
+	function clamp(z) {
+		z[31] = (z[31] & 127) | 64;
+		z[0] &= 248;
+	}
+
+	function generatePublicKey(privateKey) {
+		var r, z = new Uint8Array(32);
+		var a = gf([1]),
+			b = gf([9]),
+			c = gf(),
+			d = gf([1]),
+			e = gf(),
+			f = gf(),
+			_121665 = gf([0xdb41, 1]),
+			_9 = gf([9]);
+		for (var i = 0; i < 32; ++i)
+			z[i] = privateKey[i];
+		clamp(z);
+		for (var i = 254; i >= 0; --i) {
+			r = (z[i >>> 3] >>> (i & 7)) & 1;
+			cswap(a, b, r);
+			cswap(c, d, r);
+			add(e, a, c);
+			subtract(a, a, c);
+			add(c, b, d);
+			subtract(b, b, d);
+			multmod(d, e, e);
+			multmod(f, a, a);
+			multmod(a, c, a);
+			multmod(c, b, e);
+			add(e, a, c);
+			subtract(a, a, c);
+			multmod(b, a, a);
+			subtract(c, d, f);
+			multmod(a, c, _121665);
+			add(a, a, d);
+			multmod(c, c, a);
+			multmod(a, d, f);
+			multmod(d, b, _9);
+			multmod(b, e, e);
+			cswap(a, b, r);
+			cswap(c, d, r);
+		}
+		invert(c, c);
+		multmod(a, a, c);
+		pack(z, a);
+		return z;
+	}
+
+	function generatePresharedKey() {
+		var privateKey = new Uint8Array(32);
+		window.crypto.getRandomValues(privateKey);
+		return privateKey;
+	}
+
+	function generatePrivateKey() {
+		var privateKey = generatePresharedKey();
+		clamp(privateKey);
+		return privateKey;
+	}
+
+	function encodeBase64(dest, src) {
+		var input = Uint8Array.from([(src[0] >> 2) & 63, ((src[0] << 4) | (src[1] >> 4)) & 63, ((src[1] << 2) | (src[2] >> 6)) & 63, src[2] & 63]);
+		for (var i = 0; i < 4; ++i)
+			dest[i] = input[i] + 65 +
+			(((25 - input[i]) >> 8) & 6) -
+			(((51 - input[i]) >> 8) & 75) -
+			(((61 - input[i]) >> 8) & 15) +
+			(((62 - input[i]) >> 8) & 3);
+	}
+
+	function keyToBase64(key) {
+		var i, base64 = new Uint8Array(44);
+		for (i = 0; i < 32 / 3; ++i)
+			encodeBase64(base64.subarray(i * 4), key.subarray(i * 3));
+		encodeBase64(base64.subarray(i * 4), Uint8Array.from([key[i * 3 + 0], key[i * 3 + 1], 0]));
+		base64[43] = 61;
+		return String.fromCharCode.apply(null, base64);
+	}
+
+	window.wireguard = {
+		generateKeypair: function() {
+			var privateKey = generatePrivateKey();
+			var publicKey = generatePublicKey(privateKey);
+			return {
+				publicKey: keyToBase64(publicKey),
+				privateKey: keyToBase64(privateKey)
+			};
+		}
+	};
+})();
+