use cryptographically secure random function

.verb.md

@@ -8,12 +8,14 @@ var randomize = require('{%= name %}');
 
 ```js
 randomize(pattern, length, options);
+randomize.isCrypto;
 ```
 
 - `pattern` **{String}**: (required) The pattern to use for randomizing
 - `length` **{Number}**: (optional) The length of the string to generate
 - `options` **{Object}**: (optional) See available [options](#options)
 
+- `randomize.isCrypto` will be `true` when a cryptographically secure function is being used to generate random numbers. The value will be `false` when the function in use is `Math.random`.
 
 ### pattern
 

index.js

@@ -9,12 +9,14 @@
 
 var isNumber = require('is-number');
 var typeOf = require('kind-of');
+var mathRandom = require('math-random');
 
 /**
  * Expose `randomatic`
  */
 
 module.exports = randomatic;
+module.exports.isCrypto = !!mathRandom.cryptographic;
 
 /**
  * Available mask characters
@@ -78,7 +80,7 @@ function randomatic(pattern, length, options) {
   if (custom) mask += pattern;
 
   while (length--) {
-    res += mask.charAt(parseInt(Math.random() * mask.length, 10));
+    res += mask.charAt(parseInt(mathRandom() * mask.length, 10));
   }
   return res;
 };

package.json

@@ -30,7 +30,8 @@
   },
   "dependencies": {
     "is-number": "^4.0.0",
-    "kind-of": "^6.0.0"
+    "kind-of": "^6.0.0",
+    "math-random": "^1.0.1"
   },
   "devDependencies": {
     "ansi-bold": "^0.1.1",

test.js

@@ -16,6 +16,10 @@ function test(re, str) {
 }
 
 describe('randomatic', function() {
+  it('should export an isCrypto boolean property', function() {
+    assert.equal(typeof randomize.isCrypto, 'boolean');
+  });
+
   it('should throw an error when no arguments are passed:', function() {
     assert.throws(function() {
       randomize();