text: var OFFCRYPTO = {};
  
  var make_offcrypto = function(O, _crypto) {
  	var crypto;
  	if(typeof _crypto !== 'undefined') crypto = _crypto;
  	else if(typeof require !== 'undefined') {
  		try { crypto = require('crypto'); }
  		catch(e) { crypto = null; }
  	}
  
  	O.rc4 = function(key, data) {
  		var S = new Array(256);
  		var c = 0, i = 0, j = 0, t = 0;
  		for(i = 0; i != 256; ++i) S[i] = i;
  		for(i = 0; i != 256; ++i) {
  			j = (j + S[i] + (key[i%key.length]).charCodeAt(0))&255;
  			t = S[i]; S[i] = S[j]; S[j] = t;
  		}
  		// $FlowIgnore
  		i = j = 0; var out = Buffer(data.length);
  		for(c = 0; c != data.length; ++c) {
  			i = (i + 1)&255;
  			j = (j + S[i])%256;
  			t = S[i]; S[i] = S[j]; S[j] = t;
  			out[c] = (data[c] ^ S[(S[i]+S[j])&255]);
  		}
  		return out;
  	};
  
  	O.md5 = function(hex) {
  		if(!crypto) throw new Error("Unsupported crypto");
  		return crypto.createHash('md5').update(hex).digest('hex');
  	};
  };
  /*:: declare var crypto:any; */
  make_offcrypto(OFFCRYPTO, typeof crypto !== "undefined" ? crypto : undefined);
  
  