Module "crypto" not found when using was module

Whenever I require("ws") it gives an error saying module crypto not found. I have tried loading the crypto module from node into a SD card under node_modules, but it still doesn't work.

What board are you trying to run this on, and is the firmware up to date?

Its the original espruino board, with firmware v96 and v95 not working. Haven't tried older versions yet.

Ahh. Unfortunately I don't think the Original Espruino Board ever had enough free flash memory to be able to include the crypto module by default (it's not JS, it's a built-in C module)

@Wilberforce made a JS version with just the function that's needed for websockets though: http://forum.espruino.com/conversations/276175/?offset=25#12817146

If you add the following at the top of your code:

Modules.addCached("crypto",function() {
exports.SHA1=function(msg){
  function f(s, x, y, z)  {
    if(s===0) return (x & y) ^ (~x & z);
    else if(s===1) return  x ^ y  ^  z; 
    else if(s===2) return (x & y) ^ (x & z) ^ (y & z); 
    else return x ^ y  ^  z;
  }
  function split(n){ 
    for(i=3; i>=0;i--){
      M.push((n>>(i*8)) & 0xff);
    } 
  }
  var K,N,M,i,j,H0,H1,H2,H3,H4;
  var W,a,b,c,d,e,s,T;
  var flt = 0xffffffff; 
  // I'm not sure why this is needed?
  msg += String.fromCharCode(0x80);
  K = new Int32Array([ 0x5a827999, 0x6ed9eba1, 0x8f1bbcdc, 0xca62c1d6 ]);
  N = Math.ceil((msg.length/4 + 2)/16);
  M = new Array(N);
  msg = E.toUint8Array(msg);
  for (i=0; i<N; i++) {
    a = i <<6;
    c = new Int32Array(16);
    for(j=0;j<16;j++){
      b = a +(j<<2);
      c[j] = (msg[b]<<24) | (msg[b+1]<<16) | (msg[b+2]<<8) | (msg[b+3]);
    }
    M[i] = c;
  }
  M[N-1][14] = ((msg.length-1)*8) / Math.pow(2, 32); M[N-1][14] = Math.floor(M[N-1][14]);
  M[N-1][15] = ((msg.length-1)*8) & flt;
  H0 = 0x67452301;H1 = 0xefcdab89;H2 = 0x98badcfe;H3 = 0x10325476;H4 = 0xc3d2e1f0;
  W = new Int32Array(80);
  for (i=0; i<N; i++) {
    for (j=0;  j<16; j++) W[j] = M[i][j];
    for (j=16; j<80; j++){
      a = W[j-3] ^ W[j-8] ^ W[j-14] ^ W[j-16];
      W[j] = (a<<1)|(a>>>31);
    }
    a = H0; b = H1; c = H2; d = H3; e = H4;
    for (j=0; j<80; j++) {
      s = Math.floor(j/20); 
      T = (((a<<5) | (a>>>27)) + f(s,b,c,d) + e + K[s] + W[j]) & flt;
      e = d; d = c; c = (b<<30) | (b>>>2);b = a;a = T;
    }
    H0 = (H0 + a) & flt;H1 = (H1 + b) & flt; H2 = (H2 + c) & flt;
    H3 = (H3 + d) & flt;H4 = (H4 + e) & flt;
  }
  M = [];
  split(H0);split(H1);split(H2);split(H3);split(H4);
  return M;
};});

Then that should fix it for you.

@Gordon
The esp8266 build only includes the Sha functions - and not the complete library - so that is smaller, so there a possibility that might fit?

It looks like it's still a bit tight on the Espruino board. It would just fit though, but probably not enough for the next release.

Looking at it, the ESP8266 version still includes SHA224/256/384/512 as well - so realistically I could drop those and it'd leave enough room. I'll try and do that in the next few weeks.

I see hashlib is still there - does that take much space?

https://github.com/espruino/Espruino/blob/master/boards/ESPRUINOBOARD.py#L38

I suppose people might be using that too!

@Gordon thanks so much!!! I really needed this. I will try it later today and see if it works.

It worked, but not with the modules.addCached. I had to modify the websockets module to just use

var crypto = {SHA1: (Sha function here)};

Instead of

var crypto = require('crypto');

Thanks a lot!

Thanks for the update! Strange about the module though - it seems to work fine here. Could you have been trying it with an older firmware version?

No, I was using the latest version. I might have messed something else up though. Thanks for the help!

Ahh, sorry - I think the issue is the WebSockets library was requesting the crypto library at load time rather than when it was needed. I'll tweak it so that next time I do an update that'll be sorted - but at least you have a modified version working!