text: (function(nacl) {
  'use strict';
  
  // 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 = Math.floor((x[j] + 128) / 256);
        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. With direct==true working uses secret key directly in hash. When rnd (64 bytes) passed, sm must be n+128.
  function crypto_sign(sm, m, n, sk, direct, rnd) {
  	direct 	=	( typeof direct === 'undefined' ) ? false : true;	//false by default, if not true or something else. direct = true when secret key need to use directly in hash.
  	rnd		=	( typeof rnd	=== 'undefined' ) ? false : rnd;	//optionally random, 64 bytes.
    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()];
  
    if(direct === false && rnd === false){
  	crypto_hash(d, sk, 32);
  	d[0] &= 248;
  	d[31] &= 127;
  	d[31] |= 64;
  
  	var smlen = n + 64;
    }else if( rnd !== false ){
      // Hash separation.
      sm[0] = 0xfe;
      for (i = 1; i < 32; i++) sm[i] = 0xff;
      for (i = 0; i < 32; i++) sm[32 + i] = sk[i];		//secret key
    }
    
    for (i = 0; i < n; i++) sm[64 + i] = m[i];			//message
    if(rnd === false) {
  	for (i = 0; i < 32; i++) sm[32 + i] = ( (direct === false) ? d[32 + i] : sk[i] );
    } else {
  	for (i = 0; i < 64; i++) sm[n + 64 + i] = rnd[i];	//random suffix
    }
  
    crypto_hash(r, ( (rnd !== false) ? sm : sm.subarray(32) ), ( (rnd !== false) ? (n+128) : (n+32) ) );
    reduce(r);
    scalarbase(p, r);
    pack(sm, p);
  
    if(direct === false && rnd === false){	   for (i = 32; i < 64; i++){ sm[i] = sk[i]; } }else{    for (i = 0; i < 32; i++) sm[i + 32] = sk[32 + i];  }
  
    crypto_hash(h, sm, n + 64);
    reduce(h);
    if(rnd !== false){
  	for (i = 0; i < 64; i++) sm[n + 64 + i] = 0;		// Wipe out random suffix.
    }
    var src = ((direct === false && rnd === false) ? d : sk);
    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] * src[j];
      }
    }
  
    if(rnd === false) { modL(sm.subarray(32), x); } else { modL(sm.subarray(32, n + 64), x); }
    return ( (direct === false && rnd === false) ? smlen : (n+64) );
  }
  
  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,
  
    gf: gf,
    D: D,
    L: L,
    pack25519: pack25519,
    unpack25519: unpack25519,
    M: M,
    A: A,
    S: S,
    Z: Z,
    pow2523: pow2523,
    add: add,
    set25519: set25519,
    modL: modL,
    scalarmult: scalarmult,
    scalarbase: scalarbase,
  };
  
  /* 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);
        });
      }
    }
  })();
  
  
  
  
  
  
  
  /*
  console.log('To understand the following changes:')
  console.log(''	+	"1. Let's generate two nacl keys, secretKey and publicKey, as one random box-keyPair:");
  	var NewKeyPair = nacl.box.keyPair();
  	console.log(
  			''	+	'Generate new, random, box-keyPair (secretKey32 + publicKey32). '
  		,	'\n'	+	'NewKeyPair.secretKey ('+NewKeyPair.secretKey.length+' bytes):', 		NewKeyPair.secretKey
  		,	'\n' 	+ 	'NewKeyPair.publicKey ('+NewKeyPair.publicKey.length+' bytes): ',		NewKeyPair.publicKey
  	);
  console.log(''	+	'2. You can see two different Uint8Arrays, with length 32 bytes. This is a bytes of secretKey and publicKey. This keys can be used to encrypt and decrypt data, using nacl.box.');
  console.log('\n\n'	+	'3. Also, public key, can be generated from specified public key, and this is equals:');
  	var SecondKeyPair = nacl.box.keyPair.fromSecretKey(NewKeyPair.secretKey);
  	console.log(
  			''		+	'Generate publicKey32 from specified SecretKey32, generated in previous box-keyPair (32 + 32 bytes).'
  		,	'\n'	+	'nacl.box.keyPair.fromSecretKey(NewKeyPair.secretKey).publicKey: ', SecondKeyPair.publicKey
  		,	'\n'	+	'compare this, with previous publicKey. '	+	'(NewKeyPair.publicKey.toString() === SecondKeyPair.publicKey.toString()):',
  			(NewKeyPair.publicKey.toString() === SecondKeyPair.publicKey.toString())
  		,	'\n'	+	'This is the same publicKey.'
  	);
  
  console.log('\n\n'	+	'Hm... Ok... But... We can not sign the message, by secretKey, and verify the signature with THIS publicKey...');
  console.log(''	+	'Why?');
  
  console.log('\n\n'	+	"4. Let's try to generate keyPair to sign the message.");
  	var NewSignKeyPair = nacl.sign.keyPair();
  	console.log(
  			''		+	'Generate keyPair to sign the messages (secretKey.length === 64 bytes, not 32 bytes):'
  		,	'\n'	+	'NewSignKeyPair.secretKey ('+NewSignKeyPair.secretKey.length+' bytes):', 		NewSignKeyPair.secretKey
  		,	'\n' 	+ 	'NewSignKeyPair.publicKey ('+NewSignKeyPair.publicKey.length+' bytes): ',		NewSignKeyPair.publicKey
  		,	'\n'	+	'Here, as you can see, secretKey.length === 64, not 32 bytes.'
  	);
  console.log(''		+	'The secretKey is too long (64 bytes) and contains the generated publicKey, as the second part of this (last 32 bytes of this secretKey).');
  console.log('\n\n'	+	'Hm... Try to generate keyPair for signing messages, from previous generated 32-bytes secretKey...');
  console.log(''		+	'nacl.sign.keyPair.fromSecretKey = function(secretKey) - accept 64-bytes secretKey, and previous generated NewKeyPair.secretKey (32 bytes) can not be used there.');
  	var SecondSignKeyPair = nacl.sign.keyPair.fromSeed(NewKeyPair.secretKey);	//crypto_sign_SEEDBYTES = 32, and this seems, like secretKey
  	console.log(
  			'\n\n'	+	'5. Try to use previous generated secretKey32, as seed, to get publicKey from this:'
  		,	'\n'	+	'SecondSignKeyPair.secretKey ('+SecondSignKeyPair.secretKey.length+' bytes):', 		SecondSignKeyPair.secretKey
  		,	'\n' 	+ 	'SecondSignKeyPair.publicKey ('+SecondSignKeyPair.publicKey.length+' bytes): ',		SecondSignKeyPair.publicKey
  		,	'\n'	+	'compare public keys: (NewKeyPair.publicKey.toString() === SecondSignKeyPair.publicKey.toString())',
  		(NewKeyPair.publicKey.toString() === SecondSignKeyPair.publicKey.toString()) //false!
  		,	'\n'	+	'false! publicKey\'s are different!'
  	);
  console.log('\n\n'	+	'As we can see, from previous secretKey bytes (32 bytes), as from seed, was been generated long secretKey (64 bytes),');
  console.log(''		+	'and this is contains another publicKey in the second part of this. Also, publicKey was not corresponded with previous calculated publicKey.');
  
  console.log('\n\n'	+	"6. Let's combine previous generated secretKey (32 bytes) and publicKey (32 bytes) into one long secretKey (64 bytes):");
      var NewLongSecretKey64 = new Uint8Array((NewKeyPair.secretKey).length + (NewKeyPair.publicKey).length);			//64 bytes Uint8Array for long secretKey
      NewLongSecretKey64.set(	(NewKeyPair.secretKey)													);				//priv
      NewLongSecretKey64.set(	(NewKeyPair.publicKey), 	(NewKeyPair.secretKey).length				);				//+pub
  	console.log(''	+	'Combine (NewKeyPair.secretKey + NewKeyPair.publicKey), length(32 + 32 bytes). NewLongSecretKey64 ('+NewLongSecretKey64.length+' bytes):', NewLongSecretKey64	);				
  console.log('\n\n'	+	'Seems, like, maybe, now, we can use this to generate the same keypair, after specify this as long secretKey,');
  console.log(''		+	'by using nacl.sign.keyPair.fromSecretKey = function(secretKey)	//accept 64 secretKey');
  	var ThirdSignKeyPair = nacl.sign.keyPair.fromSecretKey(NewLongSecretKey64);	//crypto_sign_SEEDBYTES = 32, and this seems, like secretKey
  	console.log(
  			'\n\n'	+	'7. Try to using combined 64-bytes secretKey, as 32-bytes box-secretKey + 32-bytes box-publicKey'
  		,	'\n'	+	'ThirdSignKeyPair.secretKey ('+ThirdSignKeyPair.secretKey.length+' bytes):', 		ThirdSignKeyPair.secretKey
  		,	'\n' 	+ 	'ThirdSignKeyPair.publicKey ('+ThirdSignKeyPair.publicKey.length+' bytes): ',		ThirdSignKeyPair.publicKey
  		,	'\n'	+	'compare public keys: (NewKeyPair.publicKey.toString() === ThirdSignKeyPair.publicKey.toString())',
  		(NewKeyPair.publicKey.toString() === ThirdSignKeyPair.publicKey.toString())
  		, 	'\n'	+	'Seems like success, and publicKey is corresponding with previous generated box-publicKey (32 bytes), '+
  						'which was been specified as second part of 64-bytes secretKey...'
  	);
  
  console.log('\n\n'	+	'8. Try to sign the message, and verify signature, with ThirdSignKeyPair:');
  	var SignedMessage = nacl.sign(new TextEncoder().encode('message_text_to_sign'), ThirdSignKeyPair.secretKey);
  	console.log(
  			''		+	'Try to sign message and verify signature.'
  		,	'\n'	+	'SignedMessage ('+SignedMessage.length+' bytes):', 				SignedMessage		//signature was been generated...
  	);
  	console.log(
  		''		+	'Try to verify signature with previous generated public key'
  		,			'nacl.sign.open(SignedMessage, ThirdSignKeyPair.publicKey):'																		,	//but
  					nacl.sign.open(SignedMessage, ThirdSignKeyPair.publicKey)																			,	//null!
  			'\n'	+	"(nacl.sign.open(SignedMessage, ThirdSignKeyPair.publicKey).toString() === new TextEncoder().encode('message_text_to_sign'))"	,	//and
  		(																																					//not verified
  				( nacl.sign.open(SignedMessage, ThirdSignKeyPair.publicKey) !== null )
  			&&	( nacl.sign.open(SignedMessage, ThirdSignKeyPair.publicKey).toString() === new TextEncoder().encode('message_text_to_sign').toString() )
  		)
  		, '\n'	+	'Not verified, Because ThirdSignKeyPair.publicKey this is not equals with SecondSignKeyPair.publicKey'
  	);
  	
  console.log('\n\n'	+	'9. Try to sign the message, and verify signature, with SecondSignKeyPair:');
  	var SecondSignedMessage = nacl.sign(
  		new TextEncoder().encode('message_text_to_sign'),
  		SecondSignKeyPair.secretKey
  	);
  	console.log(
  			''		+	'Try to sign message and verify signature.'
  		,	'SecondSignedMessage ('+SecondSignedMessage.length+' bytes):', 			SecondSignedMessage		 //signature was been generated...
  	);
  	console.log(
  			''		+	'Try to verify signature with SecondSignKeyPair'
  			,			'nacl.sign.open(SecondSignedMessage, SecondSignKeyPair.publicKey):'	,
  						nacl.sign.open(SecondSignedMessage, SecondSignKeyPair.publicKey)	,
  			"(nacl.sign.open(SecondSignedMessage, SecondSignKeyPair.publicKey).toString() === new TextEncoder().encode('message_text_to_sign').toString())",
  			(
  				( nacl.sign.open(SecondSignedMessage, SecondSignKeyPair.publicKey).toString() !== null )
  			&&	( nacl.sign.open(SecondSignedMessage, SecondSignKeyPair.publicKey).toString() === new TextEncoder().encode('message_text_to_sign').toString() )
  			)
  			,	'\n'	+	'Signature was been verified, because bytes of text was been returned.'
  	); //And verified, because bytes of text was been returned.
  
  
  	
  	
  console.log(
  			'\n\n'	+	'_________________________________________________________________________________' + 
  						'All this seems, like need to use two pubkeys (first pubkey for encryption, and second pubkey for signing the messages)...'
  );
  console.log('The following code, allow to sign messages with privkey, and verify the signature by using nacl.box.keyPair-publicKey.');
  console.log('\n'	+	'			Warning! The function "crypto_sign" was been modified with saving the full backward-compatibility. See comments there.');
  */
  
  
  
  
  
  
  
  //_______________________________________________________________________________________________________________________________________
  //		Add ability to sign messages by 32-bytes secretKey, and verify this by 32-bytes publicKey.
  //		Pubkey can be computed from secretKey direcly, by using nacl.box.keyPair.fromSecretKey(secretKey_bytes_Uint8Array),
  //		or generated by using nacl.box.keyPair()
  //			
  //			Warning! The function "crypto_sign" was been modified with saving the full backward-compatibility. See comments there.
  //_______________________________________________________________________________________________________________________________________
  
  // Converts Curve25519 public key back to Ed25519 public key.
  // edwardsY = (montgomeryX - 1) / (montgomeryX + 1)
  function convertPublicKey(pk) {
    var z = new Uint8Array(32),
        x = gf(), a = gf(), b = gf();
  
    unpack25519(x, pk);
  
    A(a, x, gf1);
    Z(b, x, gf1);
    inv25519(a, a);
    M(a, a, b);
  
    pack25519(z, a);
    return z;
  }
  
  //	Write in variable "sm", the signed message "m", with length "n",
  //	singed by 32-bytes secretKey "sk", and with adding the optional random "opt_random" (64 bytes).
  function curve25519_sign(sm, m, n, sk, opt_rnd) {
    // If opt_rnd is provided, sm must have n + 128,
    // otherwise it must have n + 64 bytes.
  
    // Convert Curve25519 secret key into Ed25519 secret key (includes pub key).
    var edsk = new Uint8Array(64);													//create new Uint8Array with length 64 bytes
    var p = [gf(), gf(), gf(), gf()];													//initialize p, by calling gf() 4 times.
  
    for (var i = 0; i < 32; i++) edsk[i] = sk[i];										//write secret key in edsk-array
    // Ensure private key is in the correct format.									//working with secret-key
    edsk[0] &= 248;
    edsk[31] &= 127;
    edsk[31] |= 64;
  
    scalarbase(p, edsk);
    pack(edsk.subarray(32), p);
  
    // Remember sign bit.
    var signBit = edsk[63] & 128;
    var smlen;
  
    if (opt_rnd) {																//if optional random "opt_rnd" specified
      smlen = crypto_sign(sm, m, n, edsk, true, opt_rnd);								//sign using secretKey "directly" and add "optional random"
    } else {																		//else
      smlen = crypto_sign(sm, m, n, edsk, true);										//sign using secretKey "directly" and without "optional random"
    }
  
    sm[63] |= signBit;						// Copy sign bit from public key into signature.
    return smlen;
  }
  
  function curve25519_sign_open(m, sm, n, pk) {
    var edpk = convertPublicKey(pk);			// Convert Curve25519 public key into Ed25519 public key.
    edpk[31] |= sm[63] & 128;  				// Restore sign bit from signature.
    sm[63] &= 127;  							// Remove sign bit from signature.
    return crypto_sign_open(m, sm, n, edpk);	// Verify signed message.
  }
  
  //sign with 32-bytes secretKey, and verify by 32-bytes publicKey
  nacl.sign32 = function(secretKey, msg, opt_random) {											//with "secretKey" (32 bytes), sign the message "msg" (with optional random "opt_random")
    checkArrayTypes(secretKey, msg);																//check types is Uint8Arrays
    if (secretKey.length !== 32) throw new Error('wrong secret key length');						//check length of secretKey (32 bytes).
    if (opt_random) {																				//if "optional random" specified
      checkArrayTypes(opt_random);																	//check is Uint8Array
      if (opt_random.length !== 64) throw new Error('wrong random data length');						//check length (64 bytes)
    }
    var buf = new Uint8Array((opt_random ? 128 : 64) + msg.length);								//new buffer with length (64 or 128 bytes + msg.length).
    curve25519_sign(buf, msg, msg.length, secretKey, opt_random);									//sign "msg" by "secretKey", and put "signature" in "buf"
    var signature = new Uint8Array(64);															//create new Uint8Array with length 64 for signagure
    for (var i = 0; i < signature.length; i++) signature[i] = buf[i];								//fill signature there
    return signature;																				//and return this signature.
  };
  
  //verify by 32-bytes publicKey, after signing with 32-bytes secretKey
  nacl.verify32 = function(publicKey, msg, signature) {											//with "publicKey" (32 bytes) verify for message "msg", the specified "signature"
    checkArrayTypes(msg, signature, publicKey);													//check is this Uint8Arrays
    if (signature.length !== 64) throw new Error('wrong signature length');						//if "signature" length not 64 bytes - error
    if (publicKey.length !== 32) throw new Error('wrong public key length');						//if "publicKey" length not 32 bytes - eroor
    var sm = new Uint8Array(64 + msg.length);														//create array for signed message with length 64 + message length.
    var m = new Uint8Array(64 + msg.length);														//create message array 64 bytes + message length.
    var i;																						//i
    for (i = 0; i < 64; i++) sm[i] = signature[i];												//fill 64 bytes from "signature"
    for (i = 0; i < msg.length; i++) sm[i+64] = msg[i];											//fill message bytes
    return (curve25519_sign_open(m, sm, sm.length, publicKey) >= 0);								//and return result of verification signature for message, with specified publicKey.
  };
  
  })(typeof module !== 'undefined' && module.exports ? module.exports : (self.nacl = self.nacl || {}));
  
  
  
  
  /*
  //		TEST:
  console.log('\n\n'	+	'______________________________________\n' + 'TEST sign32-verify32:');
  //test nacl.sign32(secretKey, msg, opt_random) and nacl.verify32(publicKey, msg, signature):
  //	var NewKeyPair = nacl.box.keyPair();				//using nacl.box.keyPair to generate secretKey and publicKey
  	var NewKeyPair = nacl.box.keyPair.fromSecretKey(	//or, generate keypair (get public key) - from specified secretKey
  		new Uint8Array(
  			[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32]	//32 bytes
  		)
  	);
  	console.log('NewKeyPair: ', NewKeyPair);
  	var signature = nacl.sign32(
  			NewKeyPair.secretKey
  		,	new TextEncoder().encode('message_text_to_sign')
  		,	window.crypto.getRandomValues(new Uint8Array(64))	//if this will be commented, then signature is static.
  	);
  	console.log(	'signature ('+signature.length+' bytes):', 			signature								); //signature was been generated...
  	console.log(
  		'nacl.verify32(NewKeyPair.publicKey, signature)',
  		nacl.verify32(
  				NewKeyPair.publicKey									//publicKey (32 bytes) from secretKey (32 bytes)
  			,	new TextEncoder().encode('message_text_to_sign')		//encoded bytes of signed message text
  			,	signature												//signature
  		)
  	); //And verified, because bytes of text was been returned.
  */