initial

README.md

···
+# AProto
+
+ed25519 keypairs sign ts + hash in base64
+
+### code
+
+use Deno or your browser
+
+```
+import { a } from './a.js'
+
+console.log(await a.gen())
+// NtrdkXob+epH2c/k3GVtdw8lnJzMt+eEWQQ5VYgaARc=XgGOj8lESOXzfmoN6tA5fca+c5fXukw1LJFJYVhf38U22t2Rehv56kfZz+TcZW13DyWcnMy354RZBDlViBoBFw==
+
+console.log(await a.hash('Hello World'))
+// pZGm1Av0IEBKARczz7exkNYsZb8LzaMrV7J32a2fFG4=
+
+console.log(await a.sig('Hello World', await a.gen()))
+// 6qEZt6kv82bBpDcN0KFMUd7Bhj9HM8pDmK/+AvoPuOGH/DxdBJyOf/wsIx/IyLJRDpSL4jbIKa7mNyUEfrSWDTE3NTUxOTI3NzkwMzhwWkdtMUF2MElFQktBUmN6ejdleGtOWXNaYjhMemFNclY3SjMyYTJmRkc0PQ==
+```
+---
+MIT

a.js

···
+import nacl from "./lib/nacl-fast-es.js";
+import { decode, encode } from "./lib/base64.js";
+
+export const a = {};
+
+a.gen = async () => {
+  const g = await nacl.sign.keyPair();
+  const k = await encode(g.publicKey) + encode(g.secretKey);
+  return k;
+};
+
+a.hash = async (d) => {
+  return encode(
+    Array.from(
+      new Uint8Array(
+        await crypto.subtle.digest("SHA-256", new TextEncoder().encode(d)),
+      ),
+    ),
+  );
+};
+
+a.sign = async (d, k) => {
+  const ts = Date.now();
+  const h = await a.hash(d);
+  const s = encode(
+    nacl.sign(new TextEncoder().encode(ts + h), decode(k.substring(44))),
+  );
+
+  return s;
+};

ex.js

···
+import { a } from "./a.js";
+
+const m = "Hello World";
+const k = await a.gen();
+
+console.log(k);
+console.log(await a.hash(m));
+console.log(await a.sign(m, k));

lib/base64.js

···
+// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
+// This module is browser compatible.
+
+const base64abc = [
+  "A",
+  "B",
+  "C",
+  "D",
+  "E",
+  "F",
+  "G",
+  "H",
+  "I",
+  "J",
+  "K",
+  "L",
+  "M",
+  "N",
+  "O",
+  "P",
+  "Q",
+  "R",
+  "S",
+  "T",
+  "U",
+  "V",
+  "W",
+  "X",
+  "Y",
+  "Z",
+  "a",
+  "b",
+  "c",
+  "d",
+  "e",
+  "f",
+  "g",
+  "h",
+  "i",
+  "j",
+  "k",
+  "l",
+  "m",
+  "n",
+  "o",
+  "p",
+  "q",
+  "r",
+  "s",
+  "t",
+  "u",
+  "v",
+  "w",
+  "x",
+  "y",
+  "z",
+  "0",
+  "1",
+  "2",
+  "3",
+  "4",
+  "5",
+  "6",
+  "7",
+  "8",
+  "9",
+  "+",
+  "/",
+];
+
+/**
+ * CREDIT: https://gist.github.com/enepomnyaschih/72c423f727d395eeaa09697058238727
+ * Encodes a given Uint8Array, ArrayBuffer or string into RFC4648 base64 representation
+ * @param data
+ */
+export function encode(data) {
+  const uint8 = typeof data === "string"
+    ? new TextEncoder().encode(data)
+    : data instanceof Uint8Array
+    ? data
+    : new Uint8Array(data);
+  let result = "",
+    i;
+  const l = uint8.length;
+  for (i = 2; i < l; i += 3) {
+    result += base64abc[uint8[i - 2] >> 2];
+    result += base64abc[((uint8[i - 2] & 0x03) << 4) | (uint8[i - 1] >> 4)];
+    result += base64abc[((uint8[i - 1] & 0x0f) << 2) | (uint8[i] >> 6)];
+    result += base64abc[uint8[i] & 0x3f];
+  }
+  if (i === l + 1) {
+    // 1 octet yet to write
+    result += base64abc[uint8[i - 2] >> 2];
+    result += base64abc[(uint8[i - 2] & 0x03) << 4];
+    result += "==";
+  }
+  if (i === l) {
+    // 2 octets yet to write
+    result += base64abc[uint8[i - 2] >> 2];
+    result += base64abc[((uint8[i - 2] & 0x03) << 4) | (uint8[i - 1] >> 4)];
+    result += base64abc[(uint8[i - 1] & 0x0f) << 2];
+    result += "=";
+  }
+  return result;
+}
+
+/**
+ * Decodes a given RFC4648 base64 encoded string
+ * @param b64
+ */
+export function decode(b64) {
+  const binString = atob(b64);
+  const size = binString.length;
+  const bytes = new Uint8Array(size);
+  for (let i = 0; i < size; i++) {
+    bytes[i] = binString.charCodeAt(i);
+  }
+  return bytes;
+}

lib/nacl-fast-es.js

···
+const nacl = {};
+export default nacl;
+
+// Ported in 2014 by Dmitry Chestnykh and Devi Mandiri.
+// Public domain.
+//
+// Implementation derived from TweetNaCl version 20140427.
+// See for details: http://tweetnacl.cr.yp.to/
+
+var gf = function(init) {
+  var i, r = new Float64Array(16);
+  if (init) for (i = 0; i < init.length; i++) r[i] = init[i];
+  return r;
+};
+
+//  Pluggable, initialized in high-level API below.
+var randombytes = function(/* x, n */) { throw new Error('no PRNG'); };
+
+var _0 = new Uint8Array(16);
+var _9 = new Uint8Array(32); _9[0] = 9;
+
+var gf0 = gf(),
+    gf1 = gf([1]),
+    _121665 = gf([0xdb41, 1]),
+    D = gf([0x78a3, 0x1359, 0x4dca, 0x75eb, 0xd8ab, 0x4141, 0x0a4d, 0x0070, 0xe898, 0x7779, 0x4079, 0x8cc7, 0xfe73, 0x2b6f, 0x6cee, 0x5203]),
+    D2 = gf([0xf159, 0x26b2, 0x9b94, 0xebd6, 0xb156, 0x8283, 0x149a, 0x00e0, 0xd130, 0xeef3, 0x80f2, 0x198e, 0xfce7, 0x56df, 0xd9dc, 0x2406]),
+    X = gf([0xd51a, 0x8f25, 0x2d60, 0xc956, 0xa7b2, 0x9525, 0xc760, 0x692c, 0xdc5c, 0xfdd6, 0xe231, 0xc0a4, 0x53fe, 0xcd6e, 0x36d3, 0x2169]),
+    Y = gf([0x6658, 0x6666, 0x6666, 0x6666, 0x6666, 0x6666, 0x6666, 0x6666, 0x6666, 0x6666, 0x6666, 0x6666, 0x6666, 0x6666, 0x6666, 0x6666]),
+    I = gf([0xa0b0, 0x4a0e, 0x1b27, 0xc4ee, 0xe478, 0xad2f, 0x1806, 0x2f43, 0xd7a7, 0x3dfb, 0x0099, 0x2b4d, 0xdf0b, 0x4fc1, 0x2480, 0x2b83]);
+
+function ts64(x, i, h, l) {
+  x[i]   = (h >> 24) & 0xff;
+  x[i+1] = (h >> 16) & 0xff;
+  x[i+2] = (h >>  8) & 0xff;
+  x[i+3] = h & 0xff;
+  x[i+4] = (l >> 24)  & 0xff;
+  x[i+5] = (l >> 16)  & 0xff;
+  x[i+6] = (l >>  8)  & 0xff;
+  x[i+7] = l & 0xff;
+}
+
+function vn(x, xi, y, yi, n) {
+  var i,d = 0;
+  for (i = 0; i < n; i++) d |= x[xi+i]^y[yi+i];
+  return (1 & ((d - 1) >>> 8)) - 1;
+}
+
+function crypto_verify_16(x, xi, y, yi) {
+  return vn(x,xi,y,yi,16);
+}
+
+function crypto_verify_32(x, xi, y, yi) {
+  return vn(x,xi,y,yi,32);
+}
+
+function core_salsa20(o, p, k, c) {
+  var j0  = c[ 0] & 0xff | (c[ 1] & 0xff)<<8 | (c[ 2] & 0xff)<<16 | (c[ 3] & 0xff)<<24,
+      j1  = k[ 0] & 0xff | (k[ 1] & 0xff)<<8 | (k[ 2] & 0xff)<<16 | (k[ 3] & 0xff)<<24,
+      j2  = k[ 4] & 0xff | (k[ 5] & 0xff)<<8 | (k[ 6] & 0xff)<<16 | (k[ 7] & 0xff)<<24,
+      j3  = k[ 8] & 0xff | (k[ 9] & 0xff)<<8 | (k[10] & 0xff)<<16 | (k[11] & 0xff)<<24,
+      j4  = k[12] & 0xff | (k[13] & 0xff)<<8 | (k[14] & 0xff)<<16 | (k[15] & 0xff)<<24,
+      j5  = c[ 4] & 0xff | (c[ 5] & 0xff)<<8 | (c[ 6] & 0xff)<<16 | (c[ 7] & 0xff)<<24,
+      j6  = p[ 0] & 0xff | (p[ 1] & 0xff)<<8 | (p[ 2] & 0xff)<<16 | (p[ 3] & 0xff)<<24,
+      j7  = p[ 4] & 0xff | (p[ 5] & 0xff)<<8 | (p[ 6] & 0xff)<<16 | (p[ 7] & 0xff)<<24,
+      j8  = p[ 8] & 0xff | (p[ 9] & 0xff)<<8 | (p[10] & 0xff)<<16 | (p[11] & 0xff)<<24,
+      j9  = p[12] & 0xff | (p[13] & 0xff)<<8 | (p[14] & 0xff)<<16 | (p[15] & 0xff)<<24,
+      j10 = c[ 8] & 0xff | (c[ 9] & 0xff)<<8 | (c[10] & 0xff)<<16 | (c[11] & 0xff)<<24,
+      j11 = k[16] & 0xff | (k[17] & 0xff)<<8 | (k[18] & 0xff)<<16 | (k[19] & 0xff)<<24,
+      j12 = k[20] & 0xff | (k[21] & 0xff)<<8 | (k[22] & 0xff)<<16 | (k[23] & 0xff)<<24,
+      j13 = k[24] & 0xff | (k[25] & 0xff)<<8 | (k[26] & 0xff)<<16 | (k[27] & 0xff)<<24,
+      j14 = k[28] & 0xff | (k[29] & 0xff)<<8 | (k[30] & 0xff)<<16 | (k[31] & 0xff)<<24,
+      j15 = c[12] & 0xff | (c[13] & 0xff)<<8 | (c[14] & 0xff)<<16 | (c[15] & 0xff)<<24;
+
+  var x0 = j0, x1 = j1, x2 = j2, x3 = j3, x4 = j4, x5 = j5, x6 = j6, x7 = j7,
+      x8 = j8, x9 = j9, x10 = j10, x11 = j11, x12 = j12, x13 = j13, x14 = j14,
+      x15 = j15, u;
+
+  for (var i = 0; i < 20; i += 2) {
+    u = x0 + x12 | 0;
+    x4 ^= u<<7 | u>>>(32-7);
+    u = x4 + x0 | 0;
+    x8 ^= u<<9 | u>>>(32-9);
+    u = x8 + x4 | 0;
+    x12 ^= u<<13 | u>>>(32-13);
+    u = x12 + x8 | 0;
+    x0 ^= u<<18 | u>>>(32-18);
+
+    u = x5 + x1 | 0;
+    x9 ^= u<<7 | u>>>(32-7);
+    u = x9 + x5 | 0;
+    x13 ^= u<<9 | u>>>(32-9);
+    u = x13 + x9 | 0;
+    x1 ^= u<<13 | u>>>(32-13);
+    u = x1 + x13 | 0;
+    x5 ^= u<<18 | u>>>(32-18);
+
+    u = x10 + x6 | 0;
+    x14 ^= u<<7 | u>>>(32-7);
+    u = x14 + x10 | 0;
+    x2 ^= u<<9 | u>>>(32-9);
+    u = x2 + x14 | 0;
+    x6 ^= u<<13 | u>>>(32-13);
+    u = x6 + x2 | 0;
+    x10 ^= u<<18 | u>>>(32-18);
+
+    u = x15 + x11 | 0;
+    x3 ^= u<<7 | u>>>(32-7);
+    u = x3 + x15 | 0;
+    x7 ^= u<<9 | u>>>(32-9);
+    u = x7 + x3 | 0;
+    x11 ^= u<<13 | u>>>(32-13);
+    u = x11 + x7 | 0;
+    x15 ^= u<<18 | u>>>(32-18);
+
+    u = x0 + x3 | 0;
+    x1 ^= u<<7 | u>>>(32-7);
+    u = x1 + x0 | 0;
+    x2 ^= u<<9 | u>>>(32-9);
+    u = x2 + x1 | 0;
+    x3 ^= u<<13 | u>>>(32-13);
+    u = x3 + x2 | 0;
+    x0 ^= u<<18 | u>>>(32-18);
+
+    u = x5 + x4 | 0;
+    x6 ^= u<<7 | u>>>(32-7);
+    u = x6 + x5 | 0;
+    x7 ^= u<<9 | u>>>(32-9);
+    u = x7 + x6 | 0;
+    x4 ^= u<<13 | u>>>(32-13);
+    u = x4 + x7 | 0;
+    x5 ^= u<<18 | u>>>(32-18);
+
+    u = x10 + x9 | 0;
+    x11 ^= u<<7 | u>>>(32-7);
+    u = x11 + x10 | 0;
+    x8 ^= u<<9 | u>>>(32-9);
+    u = x8 + x11 | 0;
+    x9 ^= u<<13 | u>>>(32-13);
+    u = x9 + x8 | 0;
+    x10 ^= u<<18 | u>>>(32-18);
+
+    u = x15 + x14 | 0;
+    x12 ^= u<<7 | u>>>(32-7);
+    u = x12 + x15 | 0;
+    x13 ^= u<<9 | u>>>(32-9);
+    u = x13 + x12 | 0;
+    x14 ^= u<<13 | u>>>(32-13);
+    u = x14 + x13 | 0;
+    x15 ^= u<<18 | u>>>(32-18);
+  }
+   x0 =  x0 +  j0 | 0;
+   x1 =  x1 +  j1 | 0;
+   x2 =  x2 +  j2 | 0;
+   x3 =  x3 +  j3 | 0;
+   x4 =  x4 +  j4 | 0;
+   x5 =  x5 +  j5 | 0;
+   x6 =  x6 +  j6 | 0;
+   x7 =  x7 +  j7 | 0;
+   x8 =  x8 +  j8 | 0;
+   x9 =  x9 +  j9 | 0;
+  x10 = x10 + j10 | 0;
+  x11 = x11 + j11 | 0;
+  x12 = x12 + j12 | 0;
+  x13 = x13 + j13 | 0;
+  x14 = x14 + j14 | 0;
+  x15 = x15 + j15 | 0;
+
+  o[ 0] = x0 >>>  0 & 0xff;
+  o[ 1] = x0 >>>  8 & 0xff;
+  o[ 2] = x0 >>> 16 & 0xff;
+  o[ 3] = x0 >>> 24 & 0xff;
+
+  o[ 4] = x1 >>>  0 & 0xff;
+  o[ 5] = x1 >>>  8 & 0xff;
+  o[ 6] = x1 >>> 16 & 0xff;
+  o[ 7] = x1 >>> 24 & 0xff;
+
+  o[ 8] = x2 >>>  0 & 0xff;
+  o[ 9] = x2 >>>  8 & 0xff;
+  o[10] = x2 >>> 16 & 0xff;
+  o[11] = x2 >>> 24 & 0xff;
+
+  o[12] = x3 >>>  0 & 0xff;
+  o[13] = x3 >>>  8 & 0xff;
+  o[14] = x3 >>> 16 & 0xff;
+  o[15] = x3 >>> 24 & 0xff;
+
+  o[16] = x4 >>>  0 & 0xff;
+  o[17] = x4 >>>  8 & 0xff;
+  o[18] = x4 >>> 16 & 0xff;
+  o[19] = x4 >>> 24 & 0xff;
+
+  o[20] = x5 >>>  0 & 0xff;
+  o[21] = x5 >>>  8 & 0xff;
+  o[22] = x5 >>> 16 & 0xff;
+  o[23] = x5 >>> 24 & 0xff;
+
+  o[24] = x6 >>>  0 & 0xff;
+  o[25] = x6 >>>  8 & 0xff;
+  o[26] = x6 >>> 16 & 0xff;
+  o[27] = x6 >>> 24 & 0xff;
+
+  o[28] = x7 >>>  0 & 0xff;
+  o[29] = x7 >>>  8 & 0xff;
+  o[30] = x7 >>> 16 & 0xff;
+  o[31] = x7 >>> 24 & 0xff;
+
+  o[32] = x8 >>>  0 & 0xff;
+  o[33] = x8 >>>  8 & 0xff;
+  o[34] = x8 >>> 16 & 0xff;
+  o[35] = x8 >>> 24 & 0xff;
+
+  o[36] = x9 >>>  0 & 0xff;
+  o[37] = x9 >>>  8 & 0xff;
+  o[38] = x9 >>> 16 & 0xff;
+  o[39] = x9 >>> 24 & 0xff;
+
+  o[40] = x10 >>>  0 & 0xff;
+  o[41] = x10 >>>  8 & 0xff;
+  o[42] = x10 >>> 16 & 0xff;
+  o[43] = x10 >>> 24 & 0xff;
+
+  o[44] = x11 >>>  0 & 0xff;
+  o[45] = x11 >>>  8 & 0xff;
+  o[46] = x11 >>> 16 & 0xff;
+  o[47] = x11 >>> 24 & 0xff;
+
+  o[48] = x12 >>>  0 & 0xff;
+  o[49] = x12 >>>  8 & 0xff;
+  o[50] = x12 >>> 16 & 0xff;
+  o[51] = x12 >>> 24 & 0xff;
+
+  o[52] = x13 >>>  0 & 0xff;
+  o[53] = x13 >>>  8 & 0xff;
+  o[54] = x13 >>> 16 & 0xff;
+  o[55] = x13 >>> 24 & 0xff;
+
+  o[56] = x14 >>>  0 & 0xff;
+  o[57] = x14 >>>  8 & 0xff;
+  o[58] = x14 >>> 16 & 0xff;
+  o[59] = x14 >>> 24 & 0xff;
+
+  o[60] = x15 >>>  0 & 0xff;
+  o[61] = x15 >>>  8 & 0xff;
+  o[62] = x15 >>> 16 & 0xff;
+  o[63] = x15 >>> 24 & 0xff;
+}
+
+function core_hsalsa20(o,p,k,c) {
+  var j0  = c[ 0] & 0xff | (c[ 1] & 0xff)<<8 | (c[ 2] & 0xff)<<16 | (c[ 3] & 0xff)<<24,
+      j1  = k[ 0] & 0xff | (k[ 1] & 0xff)<<8 | (k[ 2] & 0xff)<<16 | (k[ 3] & 0xff)<<24,
+      j2  = k[ 4] & 0xff | (k[ 5] & 0xff)<<8 | (k[ 6] & 0xff)<<16 | (k[ 7] & 0xff)<<24,
+      j3  = k[ 8] & 0xff | (k[ 9] & 0xff)<<8 | (k[10] & 0xff)<<16 | (k[11] & 0xff)<<24,
+      j4  = k[12] & 0xff | (k[13] & 0xff)<<8 | (k[14] & 0xff)<<16 | (k[15] & 0xff)<<24,
+      j5  = c[ 4] & 0xff | (c[ 5] & 0xff)<<8 | (c[ 6] & 0xff)<<16 | (c[ 7] & 0xff)<<24,
+      j6  = p[ 0] & 0xff | (p[ 1] & 0xff)<<8 | (p[ 2] & 0xff)<<16 | (p[ 3] & 0xff)<<24,
+      j7  = p[ 4] & 0xff | (p[ 5] & 0xff)<<8 | (p[ 6] & 0xff)<<16 | (p[ 7] & 0xff)<<24,
+      j8  = p[ 8] & 0xff | (p[ 9] & 0xff)<<8 | (p[10] & 0xff)<<16 | (p[11] & 0xff)<<24,
+      j9  = p[12] & 0xff | (p[13] & 0xff)<<8 | (p[14] & 0xff)<<16 | (p[15] & 0xff)<<24,
+      j10 = c[ 8] & 0xff | (c[ 9] & 0xff)<<8 | (c[10] & 0xff)<<16 | (c[11] & 0xff)<<24,
+      j11 = k[16] & 0xff | (k[17] & 0xff)<<8 | (k[18] & 0xff)<<16 | (k[19] & 0xff)<<24,
+      j12 = k[20] & 0xff | (k[21] & 0xff)<<8 | (k[22] & 0xff)<<16 | (k[23] & 0xff)<<24,
+      j13 = k[24] & 0xff | (k[25] & 0xff)<<8 | (k[26] & 0xff)<<16 | (k[27] & 0xff)<<24,
+      j14 = k[28] & 0xff | (k[29] & 0xff)<<8 | (k[30] & 0xff)<<16 | (k[31] & 0xff)<<24,
+      j15 = c[12] & 0xff | (c[13] & 0xff)<<8 | (c[14] & 0xff)<<16 | (c[15] & 0xff)<<24;
+
+  var x0 = j0, x1 = j1, x2 = j2, x3 = j3, x4 = j4, x5 = j5, x6 = j6, x7 = j7,
+      x8 = j8, x9 = j9, x10 = j10, x11 = j11, x12 = j12, x13 = j13, x14 = j14,
+      x15 = j15, u;
+
+  for (var i = 0; i < 20; i += 2) {
+    u = x0 + x12 | 0;
+    x4 ^= u<<7 | u>>>(32-7);
+    u = x4 + x0 | 0;
+    x8 ^= u<<9 | u>>>(32-9);
+    u = x8 + x4 | 0;
+    x12 ^= u<<13 | u>>>(32-13);
+    u = x12 + x8 | 0;
+    x0 ^= u<<18 | u>>>(32-18);
+
+    u = x5 + x1 | 0;
+    x9 ^= u<<7 | u>>>(32-7);
+    u = x9 + x5 | 0;
+    x13 ^= u<<9 | u>>>(32-9);
+    u = x13 + x9 | 0;
+    x1 ^= u<<13 | u>>>(32-13);
+    u = x1 + x13 | 0;
+    x5 ^= u<<18 | u>>>(32-18);
+
+    u = x10 + x6 | 0;
+    x14 ^= u<<7 | u>>>(32-7);
+    u = x14 + x10 | 0;
+    x2 ^= u<<9 | u>>>(32-9);
+    u = x2 + x14 | 0;
+    x6 ^= u<<13 | u>>>(32-13);
+    u = x6 + x2 | 0;
+    x10 ^= u<<18 | u>>>(32-18);
+
+    u = x15 + x11 | 0;
+    x3 ^= u<<7 | u>>>(32-7);
+    u = x3 + x15 | 0;
+    x7 ^= u<<9 | u>>>(32-9);
+    u = x7 + x3 | 0;
+    x11 ^= u<<13 | u>>>(32-13);
+    u = x11 + x7 | 0;
+    x15 ^= u<<18 | u>>>(32-18);
+
+    u = x0 + x3 | 0;
+    x1 ^= u<<7 | u>>>(32-7);
+    u = x1 + x0 | 0;
+    x2 ^= u<<9 | u>>>(32-9);
+    u = x2 + x1 | 0;
+    x3 ^= u<<13 | u>>>(32-13);
+    u = x3 + x2 | 0;
+    x0 ^= u<<18 | u>>>(32-18);
+
+    u = x5 + x4 | 0;
+    x6 ^= u<<7 | u>>>(32-7);
+    u = x6 + x5 | 0;
+    x7 ^= u<<9 | u>>>(32-9);
+    u = x7 + x6 | 0;
+    x4 ^= u<<13 | u>>>(32-13);
+    u = x4 + x7 | 0;
+    x5 ^= u<<18 | u>>>(32-18);
+
+    u = x10 + x9 | 0;
+    x11 ^= u<<7 | u>>>(32-7);
+    u = x11 + x10 | 0;
+    x8 ^= u<<9 | u>>>(32-9);
+    u = x8 + x11 | 0;
+    x9 ^= u<<13 | u>>>(32-13);
+    u = x9 + x8 | 0;
+    x10 ^= u<<18 | u>>>(32-18);
+
+    u = x15 + x14 | 0;
+    x12 ^= u<<7 | u>>>(32-7);
+    u = x12 + x15 | 0;
+    x13 ^= u<<9 | u>>>(32-9);
+    u = x13 + x12 | 0;
+    x14 ^= u<<13 | u>>>(32-13);
+    u = x14 + x13 | 0;
+    x15 ^= u<<18 | u>>>(32-18);
+  }
+
+  o[ 0] = x0 >>>  0 & 0xff;
+  o[ 1] = x0 >>>  8 & 0xff;
+  o[ 2] = x0 >>> 16 & 0xff;
+  o[ 3] = x0 >>> 24 & 0xff;
+
+  o[ 4] = x5 >>>  0 & 0xff;
+  o[ 5] = x5 >>>  8 & 0xff;
+  o[ 6] = x5 >>> 16 & 0xff;
+  o[ 7] = x5 >>> 24 & 0xff;
+
+  o[ 8] = x10 >>>  0 & 0xff;
+  o[ 9] = x10 >>>  8 & 0xff;
+  o[10] = x10 >>> 16 & 0xff;
+  o[11] = x10 >>> 24 & 0xff;
+
+  o[12] = x15 >>>  0 & 0xff;
+  o[13] = x15 >>>  8 & 0xff;
+  o[14] = x15 >>> 16 & 0xff;
+  o[15] = x15 >>> 24 & 0xff;
+
+  o[16] = x6 >>>  0 & 0xff;
+  o[17] = x6 >>>  8 & 0xff;
+  o[18] = x6 >>> 16 & 0xff;
+  o[19] = x6 >>> 24 & 0xff;
+
+  o[20] = x7 >>>  0 & 0xff;
+  o[21] = x7 >>>  8 & 0xff;
+  o[22] = x7 >>> 16 & 0xff;
+  o[23] = x7 >>> 24 & 0xff;
+
+  o[24] = x8 >>>  0 & 0xff;
+  o[25] = x8 >>>  8 & 0xff;
+  o[26] = x8 >>> 16 & 0xff;
+  o[27] = x8 >>> 24 & 0xff;
+
+  o[28] = x9 >>>  0 & 0xff;
+  o[29] = x9 >>>  8 & 0xff;
+  o[30] = x9 >>> 16 & 0xff;
+  o[31] = x9 >>> 24 & 0xff;
+}
+
+function crypto_core_salsa20(out,inp,k,c) {
+  core_salsa20(out,inp,k,c);
+}
+
+function crypto_core_hsalsa20(out,inp,k,c) {
+  core_hsalsa20(out,inp,k,c);
+}
+
+var sigma = new Uint8Array([101, 120, 112, 97, 110, 100, 32, 51, 50, 45, 98, 121, 116, 101, 32, 107]);
+            // "expand 32-byte k"
+
+function crypto_stream_salsa20_xor(c,cpos,m,mpos,b,n,k) {
+  var z = new Uint8Array(16), x = new Uint8Array(64);
+  var u, i;
+  for (i = 0; i < 16; i++) z[i] = 0;
+  for (i = 0; i < 8; i++) z[i] = n[i];
+  while (b >= 64) {
+    crypto_core_salsa20(x,z,k,sigma);
+    for (i = 0; i < 64; i++) c[cpos+i] = m[mpos+i] ^ x[i];
+    u = 1;
+    for (i = 8; i < 16; i++) {
+      u = u + (z[i] & 0xff) | 0;
+      z[i] = u & 0xff;
+      u >>>= 8;
+    }
+    b -= 64;
+    cpos += 64;
+    mpos += 64;
+  }
+  if (b > 0) {
+    crypto_core_salsa20(x,z,k,sigma);
+    for (i = 0; i < b; i++) c[cpos+i] = m[mpos+i] ^ x[i];
+  }
+  return 0;
+}
+
+function crypto_stream_salsa20(c,cpos,b,n,k) {
+  var z = new Uint8Array(16), x = new Uint8Array(64);
+  var u, i;
+  for (i = 0; i < 16; i++) z[i] = 0;
+  for (i = 0; i < 8; i++) z[i] = n[i];
+  while (b >= 64) {
+    crypto_core_salsa20(x,z,k,sigma);
+    for (i = 0; i < 64; i++) c[cpos+i] = x[i];
+    u = 1;
+    for (i = 8; i < 16; i++) {
+      u = u + (z[i] & 0xff) | 0;
+      z[i] = u & 0xff;
+      u >>>= 8;
+    }
+    b -= 64;
+    cpos += 64;
+  }
+  if (b > 0) {
+    crypto_core_salsa20(x,z,k,sigma);
+    for (i = 0; i < b; i++) c[cpos+i] = x[i];
+  }
+  return 0;
+}
+
+function crypto_stream(c,cpos,d,n,k) {
+  var s = new Uint8Array(32);
+  crypto_core_hsalsa20(s,n,k,sigma);
+  var sn = new Uint8Array(8);
+  for (var i = 0; i < 8; i++) sn[i] = n[i+16];
+  return crypto_stream_salsa20(c,cpos,d,sn,s);
+}
+
+function crypto_stream_xor(c,cpos,m,mpos,d,n,k) {
+  var s = new Uint8Array(32);
+  crypto_core_hsalsa20(s,n,k,sigma);
+  var sn = new Uint8Array(8);
+  for (var i = 0; i < 8; i++) sn[i] = n[i+16];
+  return crypto_stream_salsa20_xor(c,cpos,m,mpos,d,sn,s);
+}
+
+/*
+* Port of Andrew Moon's Poly1305-donna-16. Public domain.
+* https://github.com/floodyberry/poly1305-donna
+*/
+
+var poly1305 = function(key) {
+  this.buffer = new Uint8Array(16);
+  this.r = new Uint16Array(10);
+  this.h = new Uint16Array(10);
+  this.pad = new Uint16Array(8);
+  this.leftover = 0;
+  this.fin = 0;
+
+  var t0, t1, t2, t3, t4, t5, t6, t7;
+
+  t0 = key[ 0] & 0xff | (key[ 1] & 0xff) << 8; this.r[0] = ( t0                     ) & 0x1fff;
+  t1 = key[ 2] & 0xff | (key[ 3] & 0xff) << 8; this.r[1] = ((t0 >>> 13) | (t1 <<  3)) & 0x1fff;
+  t2 = key[ 4] & 0xff | (key[ 5] & 0xff) << 8; this.r[2] = ((t1 >>> 10) | (t2 <<  6)) & 0x1f03;
+  t3 = key[ 6] & 0xff | (key[ 7] & 0xff) << 8; this.r[3] = ((t2 >>>  7) | (t3 <<  9)) & 0x1fff;
+  t4 = key[ 8] & 0xff | (key[ 9] & 0xff) << 8; this.r[4] = ((t3 >>>  4) | (t4 << 12)) & 0x00ff;
+  this.r[5] = ((t4 >>>  1)) & 0x1ffe;
+  t5 = key[10] & 0xff | (key[11] & 0xff) << 8; this.r[6] = ((t4 >>> 14) | (t5 <<  2)) & 0x1fff;
+  t6 = key[12] & 0xff | (key[13] & 0xff) << 8; this.r[7] = ((t5 >>> 11) | (t6 <<  5)) & 0x1f81;
+  t7 = key[14] & 0xff | (key[15] & 0xff) << 8; this.r[8] = ((t6 >>>  8) | (t7 <<  8)) & 0x1fff;
+  this.r[9] = ((t7 >>>  5)) & 0x007f;
+
+  this.pad[0] = key[16] & 0xff | (key[17] & 0xff) << 8;
+  this.pad[1] = key[18] & 0xff | (key[19] & 0xff) << 8;
+  this.pad[2] = key[20] & 0xff | (key[21] & 0xff) << 8;
+  this.pad[3] = key[22] & 0xff | (key[23] & 0xff) << 8;
+  this.pad[4] = key[24] & 0xff | (key[25] & 0xff) << 8;
+  this.pad[5] = key[26] & 0xff | (key[27] & 0xff) << 8;
+  this.pad[6] = key[28] & 0xff | (key[29] & 0xff) << 8;
+  this.pad[7] = key[30] & 0xff | (key[31] & 0xff) << 8;
+};
+
+poly1305.prototype.blocks = function(m, mpos, bytes) {
+  var hibit = this.fin ? 0 : (1 << 11);
+  var t0, t1, t2, t3, t4, t5, t6, t7, c;
+  var d0, d1, d2, d3, d4, d5, d6, d7, d8, d9;
+
+  var h0 = this.h[0],
+      h1 = this.h[1],
+      h2 = this.h[2],
+      h3 = this.h[3],
+      h4 = this.h[4],
+      h5 = this.h[5],
+      h6 = this.h[6],
+      h7 = this.h[7],
+      h8 = this.h[8],
+      h9 = this.h[9];
+
+  var r0 = this.r[0],
+      r1 = this.r[1],
+      r2 = this.r[2],
+      r3 = this.r[3],
+      r4 = this.r[4],
+      r5 = this.r[5],
+      r6 = this.r[6],
+      r7 = this.r[7],
+      r8 = this.r[8],
+      r9 = this.r[9];
+
+  while (bytes >= 16) {
+    t0 = m[mpos+ 0] & 0xff | (m[mpos+ 1] & 0xff) << 8; h0 += ( t0                     ) & 0x1fff;
+    t1 = m[mpos+ 2] & 0xff | (m[mpos+ 3] & 0xff) << 8; h1 += ((t0 >>> 13) | (t1 <<  3)) & 0x1fff;
+    t2 = m[mpos+ 4] & 0xff | (m[mpos+ 5] & 0xff) << 8; h2 += ((t1 >>> 10) | (t2 <<  6)) & 0x1fff;
+    t3 = m[mpos+ 6] & 0xff | (m[mpos+ 7] & 0xff) << 8; h3 += ((t2 >>>  7) | (t3 <<  9)) & 0x1fff;
+    t4 = m[mpos+ 8] & 0xff | (m[mpos+ 9] & 0xff) << 8; h4 += ((t3 >>>  4) | (t4 << 12)) & 0x1fff;
+    h5 += ((t4 >>>  1)) & 0x1fff;
+    t5 = m[mpos+10] & 0xff | (m[mpos+11] & 0xff) << 8; h6 += ((t4 >>> 14) | (t5 <<  2)) & 0x1fff;
+    t6 = m[mpos+12] & 0xff | (m[mpos+13] & 0xff) << 8; h7 += ((t5 >>> 11) | (t6 <<  5)) & 0x1fff;
+    t7 = m[mpos+14] & 0xff | (m[mpos+15] & 0xff) << 8; h8 += ((t6 >>>  8) | (t7 <<  8)) & 0x1fff;
+    h9 += ((t7 >>> 5)) | hibit;
+
+    c = 0;
+
+    d0 = c;
+    d0 += h0 * r0;
+    d0 += h1 * (5 * r9);
+    d0 += h2 * (5 * r8);
+    d0 += h3 * (5 * r7);
+    d0 += h4 * (5 * r6);
+    c = (d0 >>> 13); d0 &= 0x1fff;
+    d0 += h5 * (5 * r5);
+    d0 += h6 * (5 * r4);
+    d0 += h7 * (5 * r3);
+    d0 += h8 * (5 * r2);
+    d0 += h9 * (5 * r1);
+    c += (d0 >>> 13); d0 &= 0x1fff;
+
+    d1 = c;
+    d1 += h0 * r1;
+    d1 += h1 * r0;
+    d1 += h2 * (5 * r9);
+    d1 += h3 * (5 * r8);
+    d1 += h4 * (5 * r7);
+    c = (d1 >>> 13); d1 &= 0x1fff;
+    d1 += h5 * (5 * r6);
+    d1 += h6 * (5 * r5);
+    d1 += h7 * (5 * r4);
+    d1 += h8 * (5 * r3);
+    d1 += h9 * (5 * r2);
+    c += (d1 >>> 13); d1 &= 0x1fff;
+
+    d2 = c;
+    d2 += h0 * r2;
+    d2 += h1 * r1;
+    d2 += h2 * r0;
+    d2 += h3 * (5 * r9);
+    d2 += h4 * (5 * r8);
+    c = (d2 >>> 13); d2 &= 0x1fff;
+    d2 += h5 * (5 * r7);
+    d2 += h6 * (5 * r6);
+    d2 += h7 * (5 * r5);
+    d2 += h8 * (5 * r4);
+    d2 += h9 * (5 * r3);
+    c += (d2 >>> 13); d2 &= 0x1fff;
+
+    d3 = c;
+    d3 += h0 * r3;
+    d3 += h1 * r2;
+    d3 += h2 * r1;
+    d3 += h3 * r0;
+    d3 += h4 * (5 * r9);
+    c = (d3 >>> 13); d3 &= 0x1fff;
+    d3 += h5 * (5 * r8);
+    d3 += h6 * (5 * r7);
+    d3 += h7 * (5 * r6);
+    d3 += h8 * (5 * r5);
+    d3 += h9 * (5 * r4);
+    c += (d3 >>> 13); d3 &= 0x1fff;
+
+    d4 = c;
+    d4 += h0 * r4;
+    d4 += h1 * r3;
+    d4 += h2 * r2;
+    d4 += h3 * r1;
+    d4 += h4 * r0;
+    c = (d4 >>> 13); d4 &= 0x1fff;
+    d4 += h5 * (5 * r9);
+    d4 += h6 * (5 * r8);
+    d4 += h7 * (5 * r7);
+    d4 += h8 * (5 * r6);
+    d4 += h9 * (5 * r5);
+    c += (d4 >>> 13); d4 &= 0x1fff;
+
+    d5 = c;
+    d5 += h0 * r5;
+    d5 += h1 * r4;
+    d5 += h2 * r3;
+    d5 += h3 * r2;
+    d5 += h4 * r1;
+    c = (d5 >>> 13); d5 &= 0x1fff;
+    d5 += h5 * r0;
+    d5 += h6 * (5 * r9);
+    d5 += h7 * (5 * r8);
+    d5 += h8 * (5 * r7);
+    d5 += h9 * (5 * r6);
+    c += (d5 >>> 13); d5 &= 0x1fff;
+
+    d6 = c;
+    d6 += h0 * r6;
+    d6 += h1 * r5;
+    d6 += h2 * r4;
+    d6 += h3 * r3;
+    d6 += h4 * r2;
+    c = (d6 >>> 13); d6 &= 0x1fff;
+    d6 += h5 * r1;
+    d6 += h6 * r0;
+    d6 += h7 * (5 * r9);
+    d6 += h8 * (5 * r8);
+    d6 += h9 * (5 * r7);
+    c += (d6 >>> 13); d6 &= 0x1fff;
+
+    d7 = c;
+    d7 += h0 * r7;
+    d7 += h1 * r6;
+    d7 += h2 * r5;
+    d7 += h3 * r4;
+    d7 += h4 * r3;
+    c = (d7 >>> 13); d7 &= 0x1fff;
+    d7 += h5 * r2;
+    d7 += h6 * r1;
+    d7 += h7 * r0;
+    d7 += h8 * (5 * r9);
+    d7 += h9 * (5 * r8);
+    c += (d7 >>> 13); d7 &= 0x1fff;
+
+    d8 = c;
+    d8 += h0 * r8;
+    d8 += h1 * r7;
+    d8 += h2 * r6;
+    d8 += h3 * r5;
+    d8 += h4 * r4;
+    c = (d8 >>> 13); d8 &= 0x1fff;
+    d8 += h5 * r3;
+    d8 += h6 * r2;
+    d8 += h7 * r1;
+    d8 += h8 * r0;
+    d8 += h9 * (5 * r9);
+    c += (d8 >>> 13); d8 &= 0x1fff;
+
+    d9 = c;
+    d9 += h0 * r9;
+    d9 += h1 * r8;
+    d9 += h2 * r7;
+    d9 += h3 * r6;
+    d9 += h4 * r5;
+    c = (d9 >>> 13); d9 &= 0x1fff;
+    d9 += h5 * r4;
+    d9 += h6 * r3;
+    d9 += h7 * r2;
+    d9 += h8 * r1;
+    d9 += h9 * r0;
+    c += (d9 >>> 13); d9 &= 0x1fff;
+
+    c = (((c << 2) + c)) | 0;
+    c = (c + d0) | 0;
+    d0 = c & 0x1fff;
+    c = (c >>> 13);
+    d1 += c;
+
+    h0 = d0;
+    h1 = d1;
+    h2 = d2;
+    h3 = d3;
+    h4 = d4;
+    h5 = d5;
+    h6 = d6;
+    h7 = d7;
+    h8 = d8;
+    h9 = d9;
+
+    mpos += 16;
+    bytes -= 16;
+  }
+  this.h[0] = h0;
+  this.h[1] = h1;
+  this.h[2] = h2;
+  this.h[3] = h3;
+  this.h[4] = h4;
+  this.h[5] = h5;
+  this.h[6] = h6;
+  this.h[7] = h7;
+  this.h[8] = h8;
+  this.h[9] = h9;
+};
+
+poly1305.prototype.finish = function(mac, macpos) {
+  var g = new Uint16Array(10);
+  var c, mask, f, i;
+
+  if (this.leftover) {
+    i = this.leftover;
+    this.buffer[i++] = 1;
+    for (; i < 16; i++) this.buffer[i] = 0;
+    this.fin = 1;
+    this.blocks(this.buffer, 0, 16);
+  }
+
+  c = this.h[1] >>> 13;
+  this.h[1] &= 0x1fff;
+  for (i = 2; i < 10; i++) {
+    this.h[i] += c;
+    c = this.h[i] >>> 13;
+    this.h[i] &= 0x1fff;
+  }
+  this.h[0] += (c * 5);
+  c = this.h[0] >>> 13;
+  this.h[0] &= 0x1fff;
+  this.h[1] += c;
+  c = this.h[1] >>> 13;
+  this.h[1] &= 0x1fff;
+  this.h[2] += c;
+
+  g[0] = this.h[0] + 5;
+  c = g[0] >>> 13;
+  g[0] &= 0x1fff;
+  for (i = 1; i < 10; i++) {
+    g[i] = this.h[i] + c;
+    c = g[i] >>> 13;
+    g[i] &= 0x1fff;
+  }
+  g[9] -= (1 << 13);
+
+  mask = (c ^ 1) - 1;
+  for (i = 0; i < 10; i++) g[i] &= mask;
+  mask = ~mask;
+  for (i = 0; i < 10; i++) this.h[i] = (this.h[i] & mask) | g[i];
+
+  this.h[0] = ((this.h[0]       ) | (this.h[1] << 13)                    ) & 0xffff;
+  this.h[1] = ((this.h[1] >>>  3) | (this.h[2] << 10)                    ) & 0xffff;
+  this.h[2] = ((this.h[2] >>>  6) | (this.h[3] <<  7)                    ) & 0xffff;
+  this.h[3] = ((this.h[3] >>>  9) | (this.h[4] <<  4)                    ) & 0xffff;
+  this.h[4] = ((this.h[4] >>> 12) | (this.h[5] <<  1) | (this.h[6] << 14)) & 0xffff;
+  this.h[5] = ((this.h[6] >>>  2) | (this.h[7] << 11)                    ) & 0xffff;
+  this.h[6] = ((this.h[7] >>>  5) | (this.h[8] <<  8)                    ) & 0xffff;
+  this.h[7] = ((this.h[8] >>>  8) | (this.h[9] <<  5)                    ) & 0xffff;
+
+  f = this.h[0] + this.pad[0];
+  this.h[0] = f & 0xffff;
+  for (i = 1; i < 8; i++) {
+    f = (((this.h[i] + this.pad[i]) | 0) + (f >>> 16)) | 0;
+    this.h[i] = f & 0xffff;
+  }
+
+  mac[macpos+ 0] = (this.h[0] >>> 0) & 0xff;
+  mac[macpos+ 1] = (this.h[0] >>> 8) & 0xff;
+  mac[macpos+ 2] = (this.h[1] >>> 0) & 0xff;
+  mac[macpos+ 3] = (this.h[1] >>> 8) & 0xff;
+  mac[macpos+ 4] = (this.h[2] >>> 0) & 0xff;
+  mac[macpos+ 5] = (this.h[2] >>> 8) & 0xff;
+  mac[macpos+ 6] = (this.h[3] >>> 0) & 0xff;
+  mac[macpos+ 7] = (this.h[3] >>> 8) & 0xff;
+  mac[macpos+ 8] = (this.h[4] >>> 0) & 0xff;
+  mac[macpos+ 9] = (this.h[4] >>> 8) & 0xff;
+  mac[macpos+10] = (this.h[5] >>> 0) & 0xff;
+  mac[macpos+11] = (this.h[5] >>> 8) & 0xff;
+  mac[macpos+12] = (this.h[6] >>> 0) & 0xff;
+  mac[macpos+13] = (this.h[6] >>> 8) & 0xff;
+  mac[macpos+14] = (this.h[7] >>> 0) & 0xff;
+  mac[macpos+15] = (this.h[7] >>> 8) & 0xff;
+};
+
+poly1305.prototype.update = function(m, mpos, bytes) {
+  var i, want;
+
+  if (this.leftover) {
+    want = (16 - this.leftover);
+    if (want > bytes)
+      want = bytes;
+    for (i = 0; i < want; i++)
+      this.buffer[this.leftover + i] = m[mpos+i];
+    bytes -= want;
+    mpos += want;
+    this.leftover += want;
+    if (this.leftover < 16)
+      return;
+    this.blocks(this.buffer, 0, 16);
+    this.leftover = 0;
+  }
+
+  if (bytes >= 16) {
+    want = bytes - (bytes % 16);
+    this.blocks(m, mpos, want);
+    mpos += want;
+    bytes -= want;
+  }
+
+  if (bytes) {
+    for (i = 0; i < bytes; i++)
+      this.buffer[this.leftover + i] = m[mpos+i];
+    this.leftover += bytes;
+  }
+};
+
+function crypto_onetimeauth(out, outpos, m, mpos, n, k) {
+  var s = new poly1305(k);
+  s.update(m, mpos, n);
+  s.finish(out, outpos);
+  return 0;
+}
+
+function crypto_onetimeauth_verify(h, hpos, m, mpos, n, k) {
+  var x = new Uint8Array(16);
+  crypto_onetimeauth(x,0,m,mpos,n,k);
+  return crypto_verify_16(h,hpos,x,0);
+}
+
+function crypto_secretbox(c,m,d,n,k) {
+  var i;
+  if (d < 32) return -1;
+  crypto_stream_xor(c,0,m,0,d,n,k);
+  crypto_onetimeauth(c, 16, c, 32, d - 32, c);
+  for (i = 0; i < 16; i++) c[i] = 0;
+  return 0;
+}
+
+function crypto_secretbox_open(m,c,d,n,k) {
+  var i;
+  var x = new Uint8Array(32);
+  if (d < 32) return -1;
+  crypto_stream(x,0,32,n,k);
+  if (crypto_onetimeauth_verify(c, 16,c, 32,d - 32,x) !== 0) return -1;
+  crypto_stream_xor(m,0,c,0,d,n,k);
+  for (i = 0; i < 32; i++) m[i] = 0;
+  return 0;
+}
+
+function set25519(r, a) {
+  var i;
+  for (i = 0; i < 16; i++) r[i] = a[i]|0;
+}
+
+function car25519(o) {
+  var i, v, c = 1;
+  for (i = 0; i < 16; i++) {
+    v = o[i] + c + 65535;
+    c = Math.floor(v / 65536);
+    o[i] = v - c * 65536;
+  }
+  o[0] += c-1 + 37 * (c-1);
+}
+
+function sel25519(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 pack25519(o, n) {
+  var i, j, b;
+  var m = gf(), t = gf();
+  for (i = 0; i < 16; i++) t[i] = n[i];
+  car25519(t);
+  car25519(t);
+  car25519(t);
+  for (j = 0; j < 2; j++) {
+    m[0] = t[0] - 0xffed;
+    for (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;
+    sel25519(t, m, 1-b);
+  }
+  for (i = 0; i < 16; i++) {
+    o[2*i] = t[i] & 0xff;
+    o[2*i+1] = t[i]>>8;
+  }
+}
+
+function neq25519(a, b) {
+  var c = new Uint8Array(32), d = new Uint8Array(32);
+  pack25519(c, a);
+  pack25519(d, b);
+  return crypto_verify_32(c, 0, d, 0);
+}
+
+function par25519(a) {
+  var d = new Uint8Array(32);
+  pack25519(d, a);
+  return d[0] & 1;
+}
+
+function unpack25519(o, n) {
+  var i;
+  for (i = 0; i < 16; i++) o[i] = n[2*i] + (n[2*i+1] << 8);
+  o[15] &= 0x7fff;
+}
+
+function A(o, a, b) {
+  for (var i = 0; i < 16; i++) o[i] = a[i] + b[i];
+}
+
+function Z(o, a, b) {
+  for (var i = 0; i < 16; i++) o[i] = a[i] - b[i];
+}
+
+function M(o, a, b) {
+  var v, c,
+     t0 = 0,  t1 = 0,  t2 = 0,  t3 = 0,  t4 = 0,  t5 = 0,  t6 = 0,  t7 = 0,
+     t8 = 0,  t9 = 0, t10 = 0, t11 = 0, t12 = 0, t13 = 0, t14 = 0, t15 = 0,
+    t16 = 0, t17 = 0, t18 = 0, t19 = 0, t20 = 0, t21 = 0, t22 = 0, t23 = 0,
+    t24 = 0, t25 = 0, t26 = 0, t27 = 0, t28 = 0, t29 = 0, t30 = 0,
+    b0 = b[0],
+    b1 = b[1],
+    b2 = b[2],
+    b3 = b[3],
+    b4 = b[4],
+    b5 = b[5],
+    b6 = b[6],
+    b7 = b[7],
+    b8 = b[8],
+    b9 = b[9],
+    b10 = b[10],
+    b11 = b[11],
+    b12 = b[12],
+    b13 = b[13],
+    b14 = b[14],
+    b15 = b[15];
+
+  v = a[0];
+  t0 += v * b0;
+  t1 += v * b1;
+  t2 += v * b2;
+  t3 += v * b3;
+  t4 += v * b4;
+  t5 += v * b5;
+  t6 += v * b6;
+  t7 += v * b7;
+  t8 += v * b8;
+  t9 += v * b9;
+  t10 += v * b10;
+  t11 += v * b11;
+  t12 += v * b12;
+  t13 += v * b13;
+  t14 += v * b14;
+  t15 += v * b15;
+  v = a[1];
+  t1 += v * b0;
+  t2 += v * b1;
+  t3 += v * b2;
+  t4 += v * b3;
+  t5 += v * b4;
+  t6 += v * b5;
+  t7 += v * b6;
+  t8 += v * b7;
+  t9 += v * b8;
+  t10 += v * b9;
+  t11 += v * b10;
+  t12 += v * b11;
+  t13 += v * b12;
+  t14 += v * b13;
+  t15 += v * b14;
+  t16 += v * b15;
+  v = a[2];
+  t2 += v * b0;
+  t3 += v * b1;
+  t4 += v * b2;
+  t5 += v * b3;
+  t6 += v * b4;
+  t7 += v * b5;
+  t8 += v * b6;
+  t9 += v * b7;
+  t10 += v * b8;
+  t11 += v * b9;
+  t12 += v * b10;
+  t13 += v * b11;
+  t14 += v * b12;
+  t15 += v * b13;
+  t16 += v * b14;
+  t17 += v * b15;
+  v = a[3];
+  t3 += v * b0;
+  t4 += v * b1;
+  t5 += v * b2;
+  t6 += v * b3;
+  t7 += v * b4;
+  t8 += v * b5;
+  t9 += v * b6;
+  t10 += v * b7;
+  t11 += v * b8;
+  t12 += v * b9;
+  t13 += v * b10;
+  t14 += v * b11;
+  t15 += v * b12;
+  t16 += v * b13;
+  t17 += v * b14;
+  t18 += v * b15;
+  v = a[4];
+  t4 += v * b0;
+  t5 += v * b1;
+  t6 += v * b2;
+  t7 += v * b3;
+  t8 += v * b4;
+  t9 += v * b5;
+  t10 += v * b6;
+  t11 += v * b7;
+  t12 += v * b8;
+  t13 += v * b9;
+  t14 += v * b10;
+  t15 += v * b11;
+  t16 += v * b12;
+  t17 += v * b13;
+  t18 += v * b14;
+  t19 += v * b15;
+  v = a[5];
+  t5 += v * b0;
+  t6 += v * b1;
+  t7 += v * b2;
+  t8 += v * b3;
+  t9 += v * b4;
+  t10 += v * b5;
+  t11 += v * b6;
+  t12 += v * b7;
+  t13 += v * b8;
+  t14 += v * b9;
+  t15 += v * b10;
+  t16 += v * b11;
+  t17 += v * b12;
+  t18 += v * b13;
+  t19 += v * b14;
+  t20 += v * b15;
+  v = a[6];
+  t6 += v * b0;
+  t7 += v * b1;
+  t8 += v * b2;
+  t9 += v * b3;
+  t10 += v * b4;
+  t11 += v * b5;
+  t12 += v * b6;
+  t13 += v * b7;
+  t14 += v * b8;
+  t15 += v * b9;
+  t16 += v * b10;
+  t17 += v * b11;
+  t18 += v * b12;
+  t19 += v * b13;
+  t20 += v * b14;
+  t21 += v * b15;
+  v = a[7];
+  t7 += v * b0;
+  t8 += v * b1;
+  t9 += v * b2;
+  t10 += v * b3;
+  t11 += v * b4;
+  t12 += v * b5;
+  t13 += v * b6;
+  t14 += v * b7;
+  t15 += v * b8;
+  t16 += v * b9;
+  t17 += v * b10;
+  t18 += v * b11;
+  t19 += v * b12;
+  t20 += v * b13;
+  t21 += v * b14;
+  t22 += v * b15;
+  v = a[8];
+  t8 += v * b0;
+  t9 += v * b1;
+  t10 += v * b2;
+  t11 += v * b3;
+  t12 += v * b4;
+  t13 += v * b5;
+  t14 += v * b6;
+  t15 += v * b7;
+  t16 += v * b8;
+  t17 += v * b9;
+  t18 += v * b10;
+  t19 += v * b11;
+  t20 += v * b12;
+  t21 += v * b13;
+  t22 += v * b14;
+  t23 += v * b15;
+  v = a[9];
+  t9 += v * b0;
+  t10 += v * b1;
+  t11 += v * b2;
+  t12 += v * b3;
+  t13 += v * b4;
+  t14 += v * b5;
+  t15 += v * b6;
+  t16 += v * b7;
+  t17 += v * b8;
+  t18 += v * b9;
+  t19 += v * b10;
+  t20 += v * b11;
+  t21 += v * b12;
+  t22 += v * b13;
+  t23 += v * b14;
+  t24 += v * b15;
+  v = a[10];
+  t10 += v * b0;
+  t11 += v * b1;
+  t12 += v * b2;
+  t13 += v * b3;
+  t14 += v * b4;
+  t15 += v * b5;
+  t16 += v * b6;
+  t17 += v * b7;
+  t18 += v * b8;
+  t19 += v * b9;
+  t20 += v * b10;
+  t21 += v * b11;
+  t22 += v * b12;
+  t23 += v * b13;
+  t24 += v * b14;
+  t25 += v * b15;
+  v = a[11];
+  t11 += v * b0;
+  t12 += v * b1;
+  t13 += v * b2;
+  t14 += v * b3;
+  t15 += v * b4;
+  t16 += v * b5;
+  t17 += v * b6;
+  t18 += v * b7;
+  t19 += v * b8;
+  t20 += v * b9;
+  t21 += v * b10;
+  t22 += v * b11;
+  t23 += v * b12;
+  t24 += v * b13;
+  t25 += v * b14;
+  t26 += v * b15;
+  v = a[12];
+  t12 += v * b0;
+  t13 += v * b1;
+  t14 += v * b2;
+  t15 += v * b3;
+  t16 += v * b4;
+  t17 += v * b5;
+  t18 += v * b6;
+  t19 += v * b7;
+  t20 += v * b8;
+  t21 += v * b9;
+  t22 += v * b10;
+  t23 += v * b11;
+  t24 += v * b12;
+  t25 += v * b13;
+  t26 += v * b14;
+  t27 += v * b15;
+  v = a[13];
+  t13 += v * b0;
+  t14 += v * b1;
+  t15 += v * b2;
+  t16 += v * b3;
+  t17 += v * b4;
+  t18 += v * b5;
+  t19 += v * b6;
+  t20 += v * b7;
+  t21 += v * b8;
+  t22 += v * b9;
+  t23 += v * b10;
+  t24 += v * b11;
+  t25 += v * b12;
+  t26 += v * b13;
+  t27 += v * b14;
+  t28 += v * b15;
+  v = a[14];
+  t14 += v * b0;
+  t15 += v * b1;
+  t16 += v * b2;
+  t17 += v * b3;
+  t18 += v * b4;
+  t19 += v * b5;
+  t20 += v * b6;
+  t21 += v * b7;
+  t22 += v * b8;
+  t23 += v * b9;
+  t24 += v * b10;
+  t25 += v * b11;
+  t26 += v * b12;
+  t27 += v * b13;
+  t28 += v * b14;
+  t29 += v * b15;
+  v = a[15];
+  t15 += v * b0;
+  t16 += v * b1;
+  t17 += v * b2;
+  t18 += v * b3;
+  t19 += v * b4;
+  t20 += v * b5;
+  t21 += v * b6;
+  t22 += v * b7;
+  t23 += v * b8;
+  t24 += v * b9;
+  t25 += v * b10;
+  t26 += v * b11;
+  t27 += v * b12;
+  t28 += v * b13;
+  t29 += v * b14;
+  t30 += v * b15;
+
+  t0  += 38 * t16;
+  t1  += 38 * t17;
+  t2  += 38 * t18;
+  t3  += 38 * t19;
+  t4  += 38 * t20;
+  t5  += 38 * t21;
+  t6  += 38 * t22;
+  t7  += 38 * t23;
+  t8  += 38 * t24;
+  t9  += 38 * t25;
+  t10 += 38 * t26;
+  t11 += 38 * t27;
+  t12 += 38 * t28;
+  t13 += 38 * t29;
+  t14 += 38 * t30;
+  // t15 left as is
+
+  // first car
+  c = 1;
+  v =  t0 + c + 65535; c = Math.floor(v / 65536);  t0 = v - c * 65536;
+  v =  t1 + c + 65535; c = Math.floor(v / 65536);  t1 = v - c * 65536;
+  v =  t2 + c + 65535; c = Math.floor(v / 65536);  t2 = v - c * 65536;
+  v =  t3 + c + 65535; c = Math.floor(v / 65536);  t3 = v - c * 65536;
+  v =  t4 + c + 65535; c = Math.floor(v / 65536);  t4 = v - c * 65536;
+  v =  t5 + c + 65535; c = Math.floor(v / 65536);  t5 = v - c * 65536;
+  v =  t6 + c + 65535; c = Math.floor(v / 65536);  t6 = v - c * 65536;
+  v =  t7 + c + 65535; c = Math.floor(v / 65536);  t7 = v - c * 65536;
+  v =  t8 + c + 65535; c = Math.floor(v / 65536);  t8 = v - c * 65536;
+  v =  t9 + c + 65535; c = Math.floor(v / 65536);  t9 = v - c * 65536;
+  v = t10 + c + 65535; c = Math.floor(v / 65536); t10 = v - c * 65536;
+  v = t11 + c + 65535; c = Math.floor(v / 65536); t11 = v - c * 65536;
+  v = t12 + c + 65535; c = Math.floor(v / 65536); t12 = v - c * 65536;
+  v = t13 + c + 65535; c = Math.floor(v / 65536); t13 = v - c * 65536;
+  v = t14 + c + 65535; c = Math.floor(v / 65536); t14 = v - c * 65536;
+  v = t15 + c + 65535; c = Math.floor(v / 65536); t15 = v - c * 65536;
+  t0 += c-1 + 37 * (c-1);
+
+  // second car
+  c = 1;
+  v =  t0 + c + 65535; c = Math.floor(v / 65536);  t0 = v - c * 65536;
+  v =  t1 + c + 65535; c = Math.floor(v / 65536);  t1 = v - c * 65536;
+  v =  t2 + c + 65535; c = Math.floor(v / 65536);  t2 = v - c * 65536;
+  v =  t3 + c + 65535; c = Math.floor(v / 65536);  t3 = v - c * 65536;
+  v =  t4 + c + 65535; c = Math.floor(v / 65536);  t4 = v - c * 65536;
+  v =  t5 + c + 65535; c = Math.floor(v / 65536);  t5 = v - c * 65536;
+  v =  t6 + c + 65535; c = Math.floor(v / 65536);  t6 = v - c * 65536;
+  v =  t7 + c + 65535; c = Math.floor(v / 65536);  t7 = v - c * 65536;
+  v =  t8 + c + 65535; c = Math.floor(v / 65536);  t8 = v - c * 65536;
+  v =  t9 + c + 65535; c = Math.floor(v / 65536);  t9 = v - c * 65536;
+  v = t10 + c + 65535; c = Math.floor(v / 65536); t10 = v - c * 65536;
+  v = t11 + c + 65535; c = Math.floor(v / 65536); t11 = v - c * 65536;
+  v = t12 + c + 65535; c = Math.floor(v / 65536); t12 = v - c * 65536;
+  v = t13 + c + 65535; c = Math.floor(v / 65536); t13 = v - c * 65536;
+  v = t14 + c + 65535; c = Math.floor(v / 65536); t14 = v - c * 65536;
+  v = t15 + c + 65535; c = Math.floor(v / 65536); t15 = v - c * 65536;
+  t0 += c-1 + 37 * (c-1);
+
+  o[ 0] = t0;
+  o[ 1] = t1;
+  o[ 2] = t2;
+  o[ 3] = t3;
+  o[ 4] = t4;
+  o[ 5] = t5;
+  o[ 6] = t6;
+  o[ 7] = t7;
+  o[ 8] = t8;
+  o[ 9] = t9;
+  o[10] = t10;
+  o[11] = t11;
+  o[12] = t12;
+  o[13] = t13;
+  o[14] = t14;
+  o[15] = t15;
+}
+
+function S(o, a) {
+  M(o, a, a);
+}
+
+function inv25519(o, i) {
+  var c = gf();
+  var a;
+  for (a = 0; a < 16; a++) c[a] = i[a];
+  for (a = 253; a >= 0; a--) {
+    S(c, c);
+    if(a !== 2 && a !== 4) M(c, c, i);
+  }
+  for (a = 0; a < 16; a++) o[a] = c[a];
+}
+
+function pow2523(o, i) {
+  var c = gf();
+  var a;
+  for (a = 0; a < 16; a++) c[a] = i[a];
+  for (a = 250; a >= 0; a--) {
+      S(c, c);
+      if(a !== 1) M(c, c, i);
+  }
+  for (a = 0; a < 16; a++) o[a] = c[a];
+}
+
+function crypto_scalarmult(q, n, p) {
+  var z = new Uint8Array(32);
+  var x = new Float64Array(80), r, i;
+  var a = gf(), b = gf(), c = gf(),
+      d = gf(), e = gf(), f = gf();
+  for (i = 0; i < 31; i++) z[i] = n[i];
+  z[31]=(n[31]&127)|64;
+  z[0]&=248;
+  unpack25519(x,p);
+  for (i = 0; i < 16; i++) {
+    b[i]=x[i];
+    d[i]=a[i]=c[i]=0;
+  }
+  a[0]=d[0]=1;
+  for (i=254; i>=0; --i) {
+    r=(z[i>>>3]>>>(i&7))&1;
+    sel25519(a,b,r);
+    sel25519(c,d,r);
+    A(e,a,c);
+    Z(a,a,c);
+    A(c,b,d);
+    Z(b,b,d);
+    S(d,e);
+    S(f,a);
+    M(a,c,a);
+    M(c,b,e);
+    A(e,a,c);
+    Z(a,a,c);
+    S(b,a);
+    Z(c,d,f);
+    M(a,c,_121665);
+    A(a,a,d);
+    M(c,c,a);
+    M(a,d,f);
+    M(d,b,x);
+    S(b,e);
+    sel25519(a,b,r);
+    sel25519(c,d,r);
+  }
+  for (i = 0; i < 16; i++) {
+    x[i+16]=a[i];
+    x[i+32]=c[i];
+    x[i+48]=b[i];
+    x[i+64]=d[i];
+  }
+  var x32 = x.subarray(32);
+  var x16 = x.subarray(16);
+  inv25519(x32,x32);
+  M(x16,x16,x32);
+  pack25519(q,x16);
+  return 0;
+}
+
+function crypto_scalarmult_base(q, n) {
+  return crypto_scalarmult(q, n, _9);
+}
+
+function crypto_box_keypair(y, x) {
+  randombytes(x, 32);
+  return crypto_scalarmult_base(y, x);
+}
+
+function crypto_box_beforenm(k, y, x) {
+  var s = new Uint8Array(32);
+  crypto_scalarmult(s, x, y);
+  return crypto_core_hsalsa20(k, _0, s, sigma);
+}
+
+var crypto_box_afternm = crypto_secretbox;
+var crypto_box_open_afternm = crypto_secretbox_open;
+
+function crypto_box(c, m, d, n, y, x) {
+  var k = new Uint8Array(32);
+  crypto_box_beforenm(k, y, x);
+  return crypto_box_afternm(c, m, d, n, k);
+}
+
+function crypto_box_open(m, c, d, n, y, x) {
+  var k = new Uint8Array(32);
+  crypto_box_beforenm(k, y, x);
+  return crypto_box_open_afternm(m, c, d, n, k);
+}
+
+var K = [
+  0x428a2f98, 0xd728ae22, 0x71374491, 0x23ef65cd,
+  0xb5c0fbcf, 0xec4d3b2f, 0xe9b5dba5, 0x8189dbbc,
+  0x3956c25b, 0xf348b538, 0x59f111f1, 0xb605d019,
+  0x923f82a4, 0xaf194f9b, 0xab1c5ed5, 0xda6d8118,
+  0xd807aa98, 0xa3030242, 0x12835b01, 0x45706fbe,
+  0x243185be, 0x4ee4b28c, 0x550c7dc3, 0xd5ffb4e2,
+  0x72be5d74, 0xf27b896f, 0x80deb1fe, 0x3b1696b1,
+  0x9bdc06a7, 0x25c71235, 0xc19bf174, 0xcf692694,
+  0xe49b69c1, 0x9ef14ad2, 0xefbe4786, 0x384f25e3,
+  0x0fc19dc6, 0x8b8cd5b5, 0x240ca1cc, 0x77ac9c65,
+  0x2de92c6f, 0x592b0275, 0x4a7484aa, 0x6ea6e483,
+  0x5cb0a9dc, 0xbd41fbd4, 0x76f988da, 0x831153b5,
+  0x983e5152, 0xee66dfab, 0xa831c66d, 0x2db43210,
+  0xb00327c8, 0x98fb213f, 0xbf597fc7, 0xbeef0ee4,
+  0xc6e00bf3, 0x3da88fc2, 0xd5a79147, 0x930aa725,
+  0x06ca6351, 0xe003826f, 0x14292967, 0x0a0e6e70,
+  0x27b70a85, 0x46d22ffc, 0x2e1b2138, 0x5c26c926,
+  0x4d2c6dfc, 0x5ac42aed, 0x53380d13, 0x9d95b3df,
+  0x650a7354, 0x8baf63de, 0x766a0abb, 0x3c77b2a8,
+  0x81c2c92e, 0x47edaee6, 0x92722c85, 0x1482353b,
+  0xa2bfe8a1, 0x4cf10364, 0xa81a664b, 0xbc423001,
+  0xc24b8b70, 0xd0f89791, 0xc76c51a3, 0x0654be30,
+  0xd192e819, 0xd6ef5218, 0xd6990624, 0x5565a910,
+  0xf40e3585, 0x5771202a, 0x106aa070, 0x32bbd1b8,
+  0x19a4c116, 0xb8d2d0c8, 0x1e376c08, 0x5141ab53,
+  0x2748774c, 0xdf8eeb99, 0x34b0bcb5, 0xe19b48a8,
+  0x391c0cb3, 0xc5c95a63, 0x4ed8aa4a, 0xe3418acb,
+  0x5b9cca4f, 0x7763e373, 0x682e6ff3, 0xd6b2b8a3,
+  0x748f82ee, 0x5defb2fc, 0x78a5636f, 0x43172f60,
+  0x84c87814, 0xa1f0ab72, 0x8cc70208, 0x1a6439ec,
+  0x90befffa, 0x23631e28, 0xa4506ceb, 0xde82bde9,
+  0xbef9a3f7, 0xb2c67915, 0xc67178f2, 0xe372532b,
+  0xca273ece, 0xea26619c, 0xd186b8c7, 0x21c0c207,
+  0xeada7dd6, 0xcde0eb1e, 0xf57d4f7f, 0xee6ed178,
+  0x06f067aa, 0x72176fba, 0x0a637dc5, 0xa2c898a6,
+  0x113f9804, 0xbef90dae, 0x1b710b35, 0x131c471b,
+  0x28db77f5, 0x23047d84, 0x32caab7b, 0x40c72493,
+  0x3c9ebe0a, 0x15c9bebc, 0x431d67c4, 0x9c100d4c,
+  0x4cc5d4be, 0xcb3e42b6, 0x597f299c, 0xfc657e2a,
+  0x5fcb6fab, 0x3ad6faec, 0x6c44198c, 0x4a475817
+];
+
+function crypto_hashblocks_hl(hh, hl, m, n) {
+  var wh = new Int32Array(16), wl = new Int32Array(16),
+      bh0, bh1, bh2, bh3, bh4, bh5, bh6, bh7,
+      bl0, bl1, bl2, bl3, bl4, bl5, bl6, bl7,
+      th, tl, i, j, h, l, a, b, c, d;
+
+  var ah0 = hh[0],
+      ah1 = hh[1],
+      ah2 = hh[2],
+      ah3 = hh[3],
+      ah4 = hh[4],
+      ah5 = hh[5],
+      ah6 = hh[6],
+      ah7 = hh[7],
+
+      al0 = hl[0],
+      al1 = hl[1],
+      al2 = hl[2],
+      al3 = hl[3],
+      al4 = hl[4],
+      al5 = hl[5],
+      al6 = hl[6],
+      al7 = hl[7];
+
+  var pos = 0;
+  while (n >= 128) {
+    for (i = 0; i < 16; i++) {
+      j = 8 * i + pos;
+      wh[i] = (m[j+0] << 24) | (m[j+1] << 16) | (m[j+2] << 8) | m[j+3];
+      wl[i] = (m[j+4] << 24) | (m[j+5] << 16) | (m[j+6] << 8) | m[j+7];
+    }
+    for (i = 0; i < 80; i++) {
+      bh0 = ah0;
+      bh1 = ah1;
+      bh2 = ah2;
+      bh3 = ah3;
+      bh4 = ah4;
+      bh5 = ah5;
+      bh6 = ah6;
+      bh7 = ah7;
+
+      bl0 = al0;
+      bl1 = al1;
+      bl2 = al2;
+      bl3 = al3;
+      bl4 = al4;
+      bl5 = al5;
+      bl6 = al6;
+      bl7 = al7;
+
+      // add
+      h = ah7;
+      l = al7;
+
+      a = l & 0xffff; b = l >>> 16;
+      c = h & 0xffff; d = h >>> 16;
+
+      // Sigma1
+      h = ((ah4 >>> 14) | (al4 << (32-14))) ^ ((ah4 >>> 18) | (al4 << (32-18))) ^ ((al4 >>> (41-32)) | (ah4 << (32-(41-32))));
+      l = ((al4 >>> 14) | (ah4 << (32-14))) ^ ((al4 >>> 18) | (ah4 << (32-18))) ^ ((ah4 >>> (41-32)) | (al4 << (32-(41-32))));
+
+      a += l & 0xffff; b += l >>> 16;
+      c += h & 0xffff; d += h >>> 16;
+
+      // Ch
+      h = (ah4 & ah5) ^ (~ah4 & ah6);
+      l = (al4 & al5) ^ (~al4 & al6);
+
+      a += l & 0xffff; b += l >>> 16;
+      c += h & 0xffff; d += h >>> 16;
+
+      // K
+      h = K[i*2];
+      l = K[i*2+1];
+
+      a += l & 0xffff; b += l >>> 16;
+      c += h & 0xffff; d += h >>> 16;
+
+      // w
+      h = wh[i%16];
+      l = wl[i%16];
+
+      a += l & 0xffff; b += l >>> 16;
+      c += h & 0xffff; d += h >>> 16;
+
+      b += a >>> 16;
+      c += b >>> 16;
+      d += c >>> 16;
+
+      th = c & 0xffff | d << 16;
+      tl = a & 0xffff | b << 16;
+
+      // add
+      h = th;
+      l = tl;
+
+      a = l & 0xffff; b = l >>> 16;
+      c = h & 0xffff; d = h >>> 16;
+
+      // Sigma0
+      h = ((ah0 >>> 28) | (al0 << (32-28))) ^ ((al0 >>> (34-32)) | (ah0 << (32-(34-32)))) ^ ((al0 >>> (39-32)) | (ah0 << (32-(39-32))));
+      l = ((al0 >>> 28) | (ah0 << (32-28))) ^ ((ah0 >>> (34-32)) | (al0 << (32-(34-32)))) ^ ((ah0 >>> (39-32)) | (al0 << (32-(39-32))));
+
+      a += l & 0xffff; b += l >>> 16;
+      c += h & 0xffff; d += h >>> 16;
+
+      // Maj
+      h = (ah0 & ah1) ^ (ah0 & ah2) ^ (ah1 & ah2);
+      l = (al0 & al1) ^ (al0 & al2) ^ (al1 & al2);
+
+      a += l & 0xffff; b += l >>> 16;
+      c += h & 0xffff; d += h >>> 16;
+
+      b += a >>> 16;
+      c += b >>> 16;
+      d += c >>> 16;
+
+      bh7 = (c & 0xffff) | (d << 16);
+      bl7 = (a & 0xffff) | (b << 16);
+
+      // add
+      h = bh3;
+      l = bl3;
+
+      a = l & 0xffff; b = l >>> 16;
+      c = h & 0xffff; d = h >>> 16;
+
+      h = th;
+      l = tl;
+
+      a += l & 0xffff; b += l >>> 16;
+      c += h & 0xffff; d += h >>> 16;
+
+      b += a >>> 16;
+      c += b >>> 16;
+      d += c >>> 16;
+
+      bh3 = (c & 0xffff) | (d << 16);
+      bl3 = (a & 0xffff) | (b << 16);
+
+      ah1 = bh0;
+      ah2 = bh1;
+      ah3 = bh2;
+      ah4 = bh3;
+      ah5 = bh4;
+      ah6 = bh5;
+      ah7 = bh6;
+      ah0 = bh7;
+
+      al1 = bl0;
+      al2 = bl1;
+      al3 = bl2;
+      al4 = bl3;
+      al5 = bl4;
+      al6 = bl5;
+      al7 = bl6;
+      al0 = bl7;
+
+      if (i%16 === 15) {
+        for (j = 0; j < 16; j++) {
+          // add
+          h = wh[j];
+          l = wl[j];
+
+          a = l & 0xffff; b = l >>> 16;
+          c = h & 0xffff; d = h >>> 16;
+
+          h = wh[(j+9)%16];
+          l = wl[(j+9)%16];
+
+          a += l & 0xffff; b += l >>> 16;
+          c += h & 0xffff; d += h >>> 16;
+
+          // sigma0
+          th = wh[(j+1)%16];
+          tl = wl[(j+1)%16];
+          h = ((th >>> 1) | (tl << (32-1))) ^ ((th >>> 8) | (tl << (32-8))) ^ (th >>> 7);
+          l = ((tl >>> 1) | (th << (32-1))) ^ ((tl >>> 8) | (th << (32-8))) ^ ((tl >>> 7) | (th << (32-7)));
+
+          a += l & 0xffff; b += l >>> 16;
+          c += h & 0xffff; d += h >>> 16;
+
+          // sigma1
+          th = wh[(j+14)%16];
+          tl = wl[(j+14)%16];
+          h = ((th >>> 19) | (tl << (32-19))) ^ ((tl >>> (61-32)) | (th << (32-(61-32)))) ^ (th >>> 6);
+          l = ((tl >>> 19) | (th << (32-19))) ^ ((th >>> (61-32)) | (tl << (32-(61-32)))) ^ ((tl >>> 6) | (th << (32-6)));
+
+          a += l & 0xffff; b += l >>> 16;
+          c += h & 0xffff; d += h >>> 16;
+
+          b += a >>> 16;
+          c += b >>> 16;
+          d += c >>> 16;
+
+          wh[j] = (c & 0xffff) | (d << 16);
+          wl[j] = (a & 0xffff) | (b << 16);
+        }
+      }
+    }
+
+    // add
+    h = ah0;
+    l = al0;
+
+    a = l & 0xffff; b = l >>> 16;
+    c = h & 0xffff; d = h >>> 16;
+
+    h = hh[0];
+    l = hl[0];
+
+    a += l & 0xffff; b += l >>> 16;
+    c += h & 0xffff; d += h >>> 16;
+
+    b += a >>> 16;
+    c += b >>> 16;
+    d += c >>> 16;
+
+    hh[0] = ah0 = (c & 0xffff) | (d << 16);
+    hl[0] = al0 = (a & 0xffff) | (b << 16);
+
+    h = ah1;
+    l = al1;
+
+    a = l & 0xffff; b = l >>> 16;
+    c = h & 0xffff; d = h >>> 16;
+
+    h = hh[1];
+    l = hl[1];
+
+    a += l & 0xffff; b += l >>> 16;
+    c += h & 0xffff; d += h >>> 16;
+
+    b += a >>> 16;
+    c += b >>> 16;
+    d += c >>> 16;
+
+    hh[1] = ah1 = (c & 0xffff) | (d << 16);
+    hl[1] = al1 = (a & 0xffff) | (b << 16);
+
+    h = ah2;
+    l = al2;
+
+    a = l & 0xffff; b = l >>> 16;
+    c = h & 0xffff; d = h >>> 16;
+
+    h = hh[2];
+    l = hl[2];
+
+    a += l & 0xffff; b += l >>> 16;
+    c += h & 0xffff; d += h >>> 16;
+
+    b += a >>> 16;
+    c += b >>> 16;
+    d += c >>> 16;
+
+    hh[2] = ah2 = (c & 0xffff) | (d << 16);
+    hl[2] = al2 = (a & 0xffff) | (b << 16);
+
+    h = ah3;
+    l = al3;
+
+    a = l & 0xffff; b = l >>> 16;
+    c = h & 0xffff; d = h >>> 16;
+
+    h = hh[3];
+    l = hl[3];
+
+    a += l & 0xffff; b += l >>> 16;
+    c += h & 0xffff; d += h >>> 16;
+
+    b += a >>> 16;
+    c += b >>> 16;
+    d += c >>> 16;
+
+    hh[3] = ah3 = (c & 0xffff) | (d << 16);
+    hl[3] = al3 = (a & 0xffff) | (b << 16);
+
+    h = ah4;
+    l = al4;
+
+    a = l & 0xffff; b = l >>> 16;
+    c = h & 0xffff; d = h >>> 16;
+
+    h = hh[4];
+    l = hl[4];
+
+    a += l & 0xffff; b += l >>> 16;
+    c += h & 0xffff; d += h >>> 16;
+
+    b += a >>> 16;
+    c += b >>> 16;
+    d += c >>> 16;
+
+    hh[4] = ah4 = (c & 0xffff) | (d << 16);
+    hl[4] = al4 = (a & 0xffff) | (b << 16);
+
+    h = ah5;
+    l = al5;
+
+    a = l & 0xffff; b = l >>> 16;
+    c = h & 0xffff; d = h >>> 16;
+
+    h = hh[5];
+    l = hl[5];
+
+    a += l & 0xffff; b += l >>> 16;
+    c += h & 0xffff; d += h >>> 16;
+
+    b += a >>> 16;
+    c += b >>> 16;
+    d += c >>> 16;
+
+    hh[5] = ah5 = (c & 0xffff) | (d << 16);
+    hl[5] = al5 = (a & 0xffff) | (b << 16);
+
+    h = ah6;
+    l = al6;
+
+    a = l & 0xffff; b = l >>> 16;
+    c = h & 0xffff; d = h >>> 16;
+
+    h = hh[6];
+    l = hl[6];
+
+    a += l & 0xffff; b += l >>> 16;
+    c += h & 0xffff; d += h >>> 16;
+
+    b += a >>> 16;
+    c += b >>> 16;
+    d += c >>> 16;
+
+    hh[6] = ah6 = (c & 0xffff) | (d << 16);
+    hl[6] = al6 = (a & 0xffff) | (b << 16);
+
+    h = ah7;
+    l = al7;
+
+    a = l & 0xffff; b = l >>> 16;
+    c = h & 0xffff; d = h >>> 16;
+
+    h = hh[7];
+    l = hl[7];
+
+    a += l & 0xffff; b += l >>> 16;
+    c += h & 0xffff; d += h >>> 16;
+
+    b += a >>> 16;
+    c += b >>> 16;
+    d += c >>> 16;
+
+    hh[7] = ah7 = (c & 0xffff) | (d << 16);
+    hl[7] = al7 = (a & 0xffff) | (b << 16);
+
+    pos += 128;
+    n -= 128;
+  }
+
+  return n;
+}
+
+function crypto_hash(out, m, n) {
+  var hh = new Int32Array(8),
+      hl = new Int32Array(8),
+      x = new Uint8Array(256),
+      i, b = n;
+
+  hh[0] = 0x6a09e667;
+  hh[1] = 0xbb67ae85;
+  hh[2] = 0x3c6ef372;
+  hh[3] = 0xa54ff53a;
+  hh[4] = 0x510e527f;
+  hh[5] = 0x9b05688c;
+  hh[6] = 0x1f83d9ab;
+  hh[7] = 0x5be0cd19;
+
+  hl[0] = 0xf3bcc908;
+  hl[1] = 0x84caa73b;
+  hl[2] = 0xfe94f82b;
+  hl[3] = 0x5f1d36f1;
+  hl[4] = 0xade682d1;
+  hl[5] = 0x2b3e6c1f;
+  hl[6] = 0xfb41bd6b;
+  hl[7] = 0x137e2179;
+
+  crypto_hashblocks_hl(hh, hl, m, n);
+  n %= 128;
+
+  for (i = 0; i < n; i++) x[i] = m[b-n+i];
+  x[n] = 128;
+
+  n = 256-128*(n<112?1:0);
+  x[n-9] = 0;
+  ts64(x, n-8,  (b / 0x20000000) | 0, b << 3);
+  crypto_hashblocks_hl(hh, hl, x, n);
+
+  for (i = 0; i < 8; i++) ts64(out, 8*i, hh[i], hl[i]);
+
+  return 0;
+}
+
+function add(p, q) {
+  var a = gf(), b = gf(), c = gf(),
+      d = gf(), e = gf(), f = gf(),
+      g = gf(), h = gf(), t = gf();
+
+  Z(a, p[1], p[0]);
+  Z(t, q[1], q[0]);
+  M(a, a, t);
+  A(b, p[0], p[1]);
+  A(t, q[0], q[1]);
+  M(b, b, t);
+  M(c, p[3], q[3]);
+  M(c, c, D2);
+  M(d, p[2], q[2]);
+  A(d, d, d);
+  Z(e, b, a);
+  Z(f, d, c);
+  A(g, d, c);
+  A(h, b, a);
+
+  M(p[0], e, f);
+  M(p[1], h, g);
+  M(p[2], g, f);
+  M(p[3], e, h);
+}
+
+function cswap(p, q, b) {
+  var i;
+  for (i = 0; i < 4; i++) {
+    sel25519(p[i], q[i], b);
+  }
+}
+
+function pack(r, p) {
+  var tx = gf(), ty = gf(), zi = gf();
+  inv25519(zi, p[2]);
+  M(tx, p[0], zi);
+  M(ty, p[1], zi);
+  pack25519(r, ty);
+  r[31] ^= par25519(tx) << 7;
+}
+
+function scalarmult(p, q, s) {
+  var b, i;
+  set25519(p[0], gf0);
+  set25519(p[1], gf1);
+  set25519(p[2], gf1);
+  set25519(p[3], gf0);
+  for (i = 255; i >= 0; --i) {
+    b = (s[(i/8)|0] >> (i&7)) & 1;
+    cswap(p, q, b);
+    add(q, p);
+    add(p, p);
+    cswap(p, q, b);
+  }
+}
+
+function scalarbase(p, s) {
+  var q = [gf(), gf(), gf(), gf()];
+  set25519(q[0], X);
+  set25519(q[1], Y);
+  set25519(q[2], gf1);
+  M(q[3], X, Y);
+  scalarmult(p, q, s);
+}
+
+function crypto_sign_keypair(pk, sk, seeded) {
+  var d = new Uint8Array(64);
+  var p = [gf(), gf(), gf(), gf()];
+  var i;
+
+  if (!seeded) randombytes(sk, 32);
+  crypto_hash(d, sk, 32);
+  d[0] &= 248;
+  d[31] &= 127;
+  d[31] |= 64;
+
+  scalarbase(p, d);
+  pack(pk, p);
+
+  for (i = 0; i < 32; i++) sk[i+32] = pk[i];
+  return 0;
+}
+
+var L = new Float64Array([0xed, 0xd3, 0xf5, 0x5c, 0x1a, 0x63, 0x12, 0x58, 0xd6, 0x9c, 0xf7, 0xa2, 0xde, 0xf9, 0xde, 0x14, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x10]);
+
+function modL(r, x) {
+  var carry, i, j, k;
+  for (i = 63; i >= 32; --i) {
+    carry = 0;
+    for (j = i - 32, k = i - 12; j < k; ++j) {
+      x[j] += carry - 16 * x[i] * L[j - (i - 32)];
+      carry = (x[j] + 128) >> 8;
+      x[j] -= carry * 256;
+    }
+    x[j] += carry;
+    x[i] = 0;
+  }
+  carry = 0;
+  for (j = 0; j < 32; j++) {
+    x[j] += carry - (x[31] >> 4) * L[j];
+    carry = x[j] >> 8;
+    x[j] &= 255;
+  }
+  for (j = 0; j < 32; j++) x[j] -= carry * L[j];
+  for (i = 0; i < 32; i++) {
+    x[i+1] += x[i] >> 8;
+    r[i] = x[i] & 255;
+  }
+}
+
+function reduce(r) {
+  var x = new Float64Array(64), i;
+  for (i = 0; i < 64; i++) x[i] = r[i];
+  for (i = 0; i < 64; i++) r[i] = 0;
+  modL(r, x);
+}
+
+// Note: difference from C - smlen returned, not passed as argument.
+function crypto_sign(sm, m, n, sk) {
+  var d = new Uint8Array(64), h = new Uint8Array(64), r = new Uint8Array(64);
+  var i, j, x = new Float64Array(64);
+  var p = [gf(), gf(), gf(), gf()];
+
+  crypto_hash(d, sk, 32);
+  d[0] &= 248;
+  d[31] &= 127;
+  d[31] |= 64;
+
+  var smlen = n + 64;
+  for (i = 0; i < n; i++) sm[64 + i] = m[i];
+  for (i = 0; i < 32; i++) sm[32 + i] = d[32 + i];
+
+  crypto_hash(r, sm.subarray(32), n+32);
+  reduce(r);
+  scalarbase(p, r);
+  pack(sm, p);
+
+  for (i = 32; i < 64; i++) sm[i] = sk[i];
+  crypto_hash(h, sm, n + 64);
+  reduce(h);
+
+  for (i = 0; i < 64; i++) x[i] = 0;
+  for (i = 0; i < 32; i++) x[i] = r[i];
+  for (i = 0; i < 32; i++) {
+    for (j = 0; j < 32; j++) {
+      x[i+j] += h[i] * d[j];
+    }
+  }
+
+  modL(sm.subarray(32), x);
+  return smlen;
+}
+
+function unpackneg(r, p) {
+  var t = gf(), chk = gf(), num = gf(),
+      den = gf(), den2 = gf(), den4 = gf(),
+      den6 = gf();
+
+  set25519(r[2], gf1);
+  unpack25519(r[1], p);
+  S(num, r[1]);
+  M(den, num, D);
+  Z(num, num, r[2]);
+  A(den, r[2], den);
+
+  S(den2, den);
+  S(den4, den2);
+  M(den6, den4, den2);
+  M(t, den6, num);
+  M(t, t, den);
+
+  pow2523(t, t);
+  M(t, t, num);
+  M(t, t, den);
+  M(t, t, den);
+  M(r[0], t, den);
+
+  S(chk, r[0]);
+  M(chk, chk, den);
+  if (neq25519(chk, num)) M(r[0], r[0], I);
+
+  S(chk, r[0]);
+  M(chk, chk, den);
+  if (neq25519(chk, num)) return -1;
+
+  if (par25519(r[0]) === (p[31]>>7)) Z(r[0], gf0, r[0]);
+
+  M(r[3], r[0], r[1]);
+  return 0;
+}
+
+function crypto_sign_open(m, sm, n, pk) {
+  var i;
+  var t = new Uint8Array(32), h = new Uint8Array(64);
+  var p = [gf(), gf(), gf(), gf()],
+      q = [gf(), gf(), gf(), gf()];
+
+  if (n < 64) return -1;
+
+  if (unpackneg(q, pk)) return -1;
+
+  for (i = 0; i < n; i++) m[i] = sm[i];
+  for (i = 0; i < 32; i++) m[i+32] = pk[i];
+  crypto_hash(h, m, n);
+  reduce(h);
+  scalarmult(p, q, h);
+
+  scalarbase(q, sm.subarray(32));
+  add(p, q);
+  pack(t, p);
+
+  n -= 64;
+  if (crypto_verify_32(sm, 0, t, 0)) {
+    for (i = 0; i < n; i++) m[i] = 0;
+    return -1;
+  }
+
+  for (i = 0; i < n; i++) m[i] = sm[i + 64];
+  return n;
+}
+
+var crypto_secretbox_KEYBYTES = 32,
+    crypto_secretbox_NONCEBYTES = 24,
+    crypto_secretbox_ZEROBYTES = 32,
+    crypto_secretbox_BOXZEROBYTES = 16,
+    crypto_scalarmult_BYTES = 32,
+    crypto_scalarmult_SCALARBYTES = 32,
+    crypto_box_PUBLICKEYBYTES = 32,
+    crypto_box_SECRETKEYBYTES = 32,
+    crypto_box_BEFORENMBYTES = 32,
+    crypto_box_NONCEBYTES = crypto_secretbox_NONCEBYTES,
+    crypto_box_ZEROBYTES = crypto_secretbox_ZEROBYTES,
+    crypto_box_BOXZEROBYTES = crypto_secretbox_BOXZEROBYTES,
+    crypto_sign_BYTES = 64,
+    crypto_sign_PUBLICKEYBYTES = 32,
+    crypto_sign_SECRETKEYBYTES = 64,
+    crypto_sign_SEEDBYTES = 32,
+    crypto_hash_BYTES = 64;
+
+nacl.lowlevel = {
+  crypto_core_hsalsa20: crypto_core_hsalsa20,
+  crypto_stream_xor: crypto_stream_xor,
+  crypto_stream: crypto_stream,
+  crypto_stream_salsa20_xor: crypto_stream_salsa20_xor,
+  crypto_stream_salsa20: crypto_stream_salsa20,
+  crypto_onetimeauth: crypto_onetimeauth,
+  crypto_onetimeauth_verify: crypto_onetimeauth_verify,
+  crypto_verify_16: crypto_verify_16,
+  crypto_verify_32: crypto_verify_32,
+  crypto_secretbox: crypto_secretbox,
+  crypto_secretbox_open: crypto_secretbox_open,
+  crypto_scalarmult: crypto_scalarmult,
+  crypto_scalarmult_base: crypto_scalarmult_base,
+  crypto_box_beforenm: crypto_box_beforenm,
+  crypto_box_afternm: crypto_box_afternm,
+  crypto_box: crypto_box,
+  crypto_box_open: crypto_box_open,
+  crypto_box_keypair: crypto_box_keypair,
+  crypto_hash: crypto_hash,
+  crypto_sign: crypto_sign,
+  crypto_sign_keypair: crypto_sign_keypair,
+  crypto_sign_open: crypto_sign_open,
+
+  crypto_secretbox_KEYBYTES: crypto_secretbox_KEYBYTES,
+  crypto_secretbox_NONCEBYTES: crypto_secretbox_NONCEBYTES,
+  crypto_secretbox_ZEROBYTES: crypto_secretbox_ZEROBYTES,
+  crypto_secretbox_BOXZEROBYTES: crypto_secretbox_BOXZEROBYTES,
+  crypto_scalarmult_BYTES: crypto_scalarmult_BYTES,
+  crypto_scalarmult_SCALARBYTES: crypto_scalarmult_SCALARBYTES,
+  crypto_box_PUBLICKEYBYTES: crypto_box_PUBLICKEYBYTES,
+  crypto_box_SECRETKEYBYTES: crypto_box_SECRETKEYBYTES,
+  crypto_box_BEFORENMBYTES: crypto_box_BEFORENMBYTES,
+  crypto_box_NONCEBYTES: crypto_box_NONCEBYTES,
+  crypto_box_ZEROBYTES: crypto_box_ZEROBYTES,
+  crypto_box_BOXZEROBYTES: crypto_box_BOXZEROBYTES,
+  crypto_sign_BYTES: crypto_sign_BYTES,
+  crypto_sign_PUBLICKEYBYTES: crypto_sign_PUBLICKEYBYTES,
+  crypto_sign_SECRETKEYBYTES: crypto_sign_SECRETKEYBYTES,
+  crypto_sign_SEEDBYTES: crypto_sign_SEEDBYTES,
+  crypto_hash_BYTES: crypto_hash_BYTES
+};
+
+/* High-level API */
+
+function checkLengths(k, n) {
+  if (k.length !== crypto_secretbox_KEYBYTES) throw new Error('bad key size');
+  if (n.length !== crypto_secretbox_NONCEBYTES) throw new Error('bad nonce size');
+}
+
+function checkBoxLengths(pk, sk) {
+  if (pk.length !== crypto_box_PUBLICKEYBYTES) throw new Error('bad public key size');
+  if (sk.length !== crypto_box_SECRETKEYBYTES) throw new Error('bad secret key size');
+}
+
+function checkArrayTypes() {
+  for (var i = 0; i < arguments.length; i++) {
+    if (!(arguments[i] instanceof Uint8Array))
+      throw new TypeError('unexpected type, use Uint8Array');
+  }
+}
+
+function cleanup(arr) {
+  for (var i = 0; i < arr.length; i++) arr[i] = 0;
+}
+
+nacl.randomBytes = function(n) {
+  var b = new Uint8Array(n);
+  randombytes(b, n);
+  return b;
+};
+
+nacl.secretbox = function(msg, nonce, key) {
+  checkArrayTypes(msg, nonce, key);
+  checkLengths(key, nonce);
+  var m = new Uint8Array(crypto_secretbox_ZEROBYTES + msg.length);
+  var c = new Uint8Array(m.length);
+  for (var i = 0; i < msg.length; i++) m[i+crypto_secretbox_ZEROBYTES] = msg[i];
+  crypto_secretbox(c, m, m.length, nonce, key);
+  return c.subarray(crypto_secretbox_BOXZEROBYTES);
+};
+
+nacl.secretbox.open = function(box, nonce, key) {
+  checkArrayTypes(box, nonce, key);
+  checkLengths(key, nonce);
+  var c = new Uint8Array(crypto_secretbox_BOXZEROBYTES + box.length);
+  var m = new Uint8Array(c.length);
+  for (var i = 0; i < box.length; i++) c[i+crypto_secretbox_BOXZEROBYTES] = box[i];
+  if (c.length < 32) return null;
+  if (crypto_secretbox_open(m, c, c.length, nonce, key) !== 0) return null;
+  return m.subarray(crypto_secretbox_ZEROBYTES);
+};
+
+nacl.secretbox.keyLength = crypto_secretbox_KEYBYTES;
+nacl.secretbox.nonceLength = crypto_secretbox_NONCEBYTES;
+nacl.secretbox.overheadLength = crypto_secretbox_BOXZEROBYTES;
+
+nacl.scalarMult = function(n, p) {
+  checkArrayTypes(n, p);
+  if (n.length !== crypto_scalarmult_SCALARBYTES) throw new Error('bad n size');
+  if (p.length !== crypto_scalarmult_BYTES) throw new Error('bad p size');
+  var q = new Uint8Array(crypto_scalarmult_BYTES);
+  crypto_scalarmult(q, n, p);
+  return q;
+};
+
+nacl.scalarMult.base = function(n) {
+  checkArrayTypes(n);
+  if (n.length !== crypto_scalarmult_SCALARBYTES) throw new Error('bad n size');
+  var q = new Uint8Array(crypto_scalarmult_BYTES);
+  crypto_scalarmult_base(q, n);
+  return q;
+};
+
+nacl.scalarMult.scalarLength = crypto_scalarmult_SCALARBYTES;
+nacl.scalarMult.groupElementLength = crypto_scalarmult_BYTES;
+
+nacl.box = function(msg, nonce, publicKey, secretKey) {
+  var k = nacl.box.before(publicKey, secretKey);
+  return nacl.secretbox(msg, nonce, k);
+};
+
+nacl.box.before = function(publicKey, secretKey) {
+  checkArrayTypes(publicKey, secretKey);
+  checkBoxLengths(publicKey, secretKey);
+  var k = new Uint8Array(crypto_box_BEFORENMBYTES);
+  crypto_box_beforenm(k, publicKey, secretKey);
+  return k;
+};
+
+nacl.box.after = nacl.secretbox;
+
+nacl.box.open = function(msg, nonce, publicKey, secretKey) {
+  var k = nacl.box.before(publicKey, secretKey);
+  return nacl.secretbox.open(msg, nonce, k);
+};
+
+nacl.box.open.after = nacl.secretbox.open;
+
+nacl.box.keyPair = function() {
+  var pk = new Uint8Array(crypto_box_PUBLICKEYBYTES);
+  var sk = new Uint8Array(crypto_box_SECRETKEYBYTES);
+  crypto_box_keypair(pk, sk);
+  return {publicKey: pk, secretKey: sk};
+};
+
+nacl.box.keyPair.fromSecretKey = function(secretKey) {
+  checkArrayTypes(secretKey);
+  if (secretKey.length !== crypto_box_SECRETKEYBYTES)
+    throw new Error('bad secret key size');
+  var pk = new Uint8Array(crypto_box_PUBLICKEYBYTES);
+  crypto_scalarmult_base(pk, secretKey);
+  return {publicKey: pk, secretKey: new Uint8Array(secretKey)};
+};
+
+nacl.box.publicKeyLength = crypto_box_PUBLICKEYBYTES;
+nacl.box.secretKeyLength = crypto_box_SECRETKEYBYTES;
+nacl.box.sharedKeyLength = crypto_box_BEFORENMBYTES;
+nacl.box.nonceLength = crypto_box_NONCEBYTES;
+nacl.box.overheadLength = nacl.secretbox.overheadLength;
+
+nacl.sign = function(msg, secretKey) {
+  checkArrayTypes(msg, secretKey);
+  if (secretKey.length !== crypto_sign_SECRETKEYBYTES)
+    throw new Error('bad secret key size');
+  var signedMsg = new Uint8Array(crypto_sign_BYTES+msg.length);
+  crypto_sign(signedMsg, msg, msg.length, secretKey);
+  return signedMsg;
+};
+
+nacl.sign.open = function(signedMsg, publicKey) {
+  checkArrayTypes(signedMsg, publicKey);
+  if (publicKey.length !== crypto_sign_PUBLICKEYBYTES)
+    throw new Error('bad public key size');
+  var tmp = new Uint8Array(signedMsg.length);
+  var mlen = crypto_sign_open(tmp, signedMsg, signedMsg.length, publicKey);
+  if (mlen < 0) return null;
+  var m = new Uint8Array(mlen);
+  for (var i = 0; i < m.length; i++) m[i] = tmp[i];
+  return m;
+};
+
+nacl.sign.detached = function(msg, secretKey) {
+  var signedMsg = nacl.sign(msg, secretKey);
+  var sig = new Uint8Array(crypto_sign_BYTES);
+  for (var i = 0; i < sig.length; i++) sig[i] = signedMsg[i];
+  return sig;
+};
+
+nacl.sign.detached.verify = function(msg, sig, publicKey) {
+  checkArrayTypes(msg, sig, publicKey);
+  if (sig.length !== crypto_sign_BYTES)
+    throw new Error('bad signature size');
+  if (publicKey.length !== crypto_sign_PUBLICKEYBYTES)
+    throw new Error('bad public key size');
+  var sm = new Uint8Array(crypto_sign_BYTES + msg.length);
+  var m = new Uint8Array(crypto_sign_BYTES + msg.length);
+  var i;
+  for (i = 0; i < crypto_sign_BYTES; i++) sm[i] = sig[i];
+  for (i = 0; i < msg.length; i++) sm[i+crypto_sign_BYTES] = msg[i];
+  return (crypto_sign_open(m, sm, sm.length, publicKey) >= 0);
+};
+
+nacl.sign.keyPair = function() {
+  var pk = new Uint8Array(crypto_sign_PUBLICKEYBYTES);
+  var sk = new Uint8Array(crypto_sign_SECRETKEYBYTES);
+  crypto_sign_keypair(pk, sk);
+  return {publicKey: pk, secretKey: sk};
+};
+
+nacl.sign.keyPair.fromSecretKey = function(secretKey) {
+  checkArrayTypes(secretKey);
+  if (secretKey.length !== crypto_sign_SECRETKEYBYTES)
+    throw new Error('bad secret key size');
+  var pk = new Uint8Array(crypto_sign_PUBLICKEYBYTES);
+  for (var i = 0; i < pk.length; i++) pk[i] = secretKey[32+i];
+  return {publicKey: pk, secretKey: new Uint8Array(secretKey)};
+};
+
+nacl.sign.keyPair.fromSeed = function(seed) {
+  checkArrayTypes(seed);
+  if (seed.length !== crypto_sign_SEEDBYTES)
+    throw new Error('bad seed size');
+  var pk = new Uint8Array(crypto_sign_PUBLICKEYBYTES);
+  var sk = new Uint8Array(crypto_sign_SECRETKEYBYTES);
+  for (var i = 0; i < 32; i++) sk[i] = seed[i];
+  crypto_sign_keypair(pk, sk, true);
+  return {publicKey: pk, secretKey: sk};
+};
+
+nacl.sign.publicKeyLength = crypto_sign_PUBLICKEYBYTES;
+nacl.sign.secretKeyLength = crypto_sign_SECRETKEYBYTES;
+nacl.sign.seedLength = crypto_sign_SEEDBYTES;
+nacl.sign.signatureLength = crypto_sign_BYTES;
+
+nacl.hash = function(msg) {
+  checkArrayTypes(msg);
+  var h = new Uint8Array(crypto_hash_BYTES);
+  crypto_hash(h, msg, msg.length);
+  return h;
+};
+
+nacl.hash.hashLength = crypto_hash_BYTES;
+
+nacl.verify = function(x, y) {
+  checkArrayTypes(x, y);
+  // Zero length arguments are considered not equal.
+  if (x.length === 0 || y.length === 0) return false;
+  if (x.length !== y.length) return false;
+  return (vn(x, 0, y, 0, x.length) === 0) ? true : false;
+};
+
+nacl.setPRNG = function(fn) {
+  randombytes = fn;
+};
+
+(function() {
+  // Initialize PRNG if environment provides CSPRNG.
+  // If not, methods calling randombytes will throw.
+  var crypto = typeof self !== 'undefined' ? (self.crypto || self.msCrypto) : null;
+  if (crypto && crypto.getRandomValues) {
+    // Browsers.
+    var QUOTA = 65536;
+    nacl.setPRNG(function(x, n) {
+      var i, v = new Uint8Array(n);
+      for (i = 0; i < n; i += QUOTA) {
+        crypto.getRandomValues(v.subarray(i, i + Math.min(n - i, QUOTA)));
+      }
+      for (i = 0; i < n; i++) x[i] = v[i];
+      cleanup(v);
+    });
+  } else if (typeof require !== 'undefined') {
+    // Node.js.
+    crypto = require('crypto');
+    if (crypto && crypto.randomBytes) {
+      nacl.setPRNG(function(x, n) {
+        var i, v = crypto.randomBytes(n);
+        for (i = 0; i < n; i++) x[i] = v[i];
+        cleanup(v);
+      });
+    }
+  }
+})();