PRNG: remove quota restriction; don't use window.

randombytes in browsers no longer throw when output length exceeds 65536
bytes. Remove mention of this from README.

Improve detection of environment (browser or Node) by also checking
process.browser.

Replace references to window with self. Fixes #65, closes #66.

README.md

@@ -287,12 +287,6 @@ depending on the platform it runs on:
 * `window.msCrypto.getRandomValues` (Internet Explorer 11)
 * `crypto.randomBytes` (Node.js)
 
-Note that browsers are required to throw `QuotaExceededError` exception if
-requested `length` is more than 65536, so do not ask for more than 65536 bytes
-in *one call* (multiple calls to get as many bytes as you like are okay:
-browsers can generate infinite amount of random bytes without any bad
-consequences).
-
 If the platform doesn't provide a suitable PRNG, the following functions,
 which require random numbers, will throw exception:
 

nacl-fast.js

@@ -2361,25 +2361,24 @@ nacl.setPRNG = function(fn) {
   // Initialize PRNG if environment provides CSPRNG.
   // If not, methods calling randombytes will throw.
   var crypto;
-  if (typeof window !== 'undefined') {
-    // Browser.
-    if (window.crypto && window.crypto.getRandomValues) {
-      crypto = window.crypto; // Standard
-    } else if (window.msCrypto && window.msCrypto.getRandomValues) {
-      crypto = window.msCrypto; // Internet Explorer 11+
-    }
-    if (crypto) {
+  if (typeof process === 'undefined' || process.browser) {
+    // Browsers.
+    crypto = self.crypto || self.msCrypto;
+    if (crypto && crypto.getRandomValues) {
+      var QUOTA = 65536;
       nacl.setPRNG(function(x, n) {
         var i, v = new Uint8Array(n);
-        crypto.getRandomValues(v);
+        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) {
+    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];
@@ -2389,4 +2388,4 @@ nacl.setPRNG = function(fn) {
   }
 })();
 
-})(typeof module !== 'undefined' && module.exports ? module.exports : (window.nacl = window.nacl || {}));
+})(typeof module !== 'undefined' && module.exports ? module.exports : (self.nacl = self.nacl || {}));

nacl.js

@@ -1148,25 +1148,24 @@ nacl.setPRNG = function(fn) {
   // Initialize PRNG if environment provides CSPRNG.
   // If not, methods calling randombytes will throw.
   var crypto;
-  if (typeof window !== 'undefined') {
-    // Browser.
-    if (window.crypto && window.crypto.getRandomValues) {
-      crypto = window.crypto; // Standard
-    } else if (window.msCrypto && window.msCrypto.getRandomValues) {
-      crypto = window.msCrypto; // Internet Explorer 11+
-    }
-    if (crypto) {
+  if (typeof process === 'undefined' || process.browser) {
+    // Browsers.
+    crypto = self.crypto || self.msCrypto;
+    if (crypto && crypto.getRandomValues) {
+      var QUOTA = 65536;
       nacl.setPRNG(function(x, n) {
         var i, v = new Uint8Array(n);
-        crypto.getRandomValues(v);
+        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) {
+    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];
@@ -1176,4 +1175,4 @@ nacl.setPRNG = function(fn) {
   }
 })();
 
-})(typeof module !== 'undefined' && module.exports ? module.exports : (window.nacl = window.nacl || {}));
+})(typeof module !== 'undefined' && module.exports ? module.exports : (self.nacl = self.nacl || {}));