Convert uuid_generate to use existing randomFill function. NFC (#23247)

Author: sbc100

src/library_uuid.js

@@ -24,37 +24,11 @@ addToLibrary({
   // Write a RFC4122 version 4 compliant UUID largely based on the method found in
   // http://stackoverflow.com/questions/105034/how-to-create-a-guid-uuid-in-javascript
   // tweaked slightly in order to use the 'compact' UUID form used by libuuid.
-  uuid_generate__deps: ['$writeArrayToMemory'],
+  uuid_generate__deps: ['$writeArrayToMemory', '$randomFill'],
   uuid_generate: (out) => {
     // void uuid_generate(uuid_t out);
-    var uuid = null;
-
-    if (ENVIRONMENT_IS_NODE) {
-#if ENVIRONMENT_MAY_BE_NODE
-      // If Node.js try to use crypto.randomBytes
-      try {
-        var rb = require('crypto')['randomBytes'];
-        uuid = rb(16);
-      } catch(e) {}
-#endif // ENVIRONMENT_MAY_BE_NODE
-    } else if (ENVIRONMENT_IS_WEB &&
-               typeof window.crypto != 'undefined' &&
-               typeof window.crypto.getRandomValues != 'undefined') {
-      // If crypto.getRandomValues is available try to use it.
-      uuid = new Uint8Array(16);
-      window.crypto.getRandomValues(uuid);
-    }
-
-    // Fall back to Math.random if a higher quality random number generator is not available.
-    if (!uuid) {
-      uuid = new Array(16);
-      var d = new Date().getTime();
-      for (var i = 0; i < 16; i++) {
-        var r = ((d + Math.random() * 256) % 256)|0;
-        d = (d / 256)|0;
-        uuid[i] = r;
-      }
-    }
+    var uuid = new Uint8Array(16);
+    randomFill(uuid);
 
     // Makes uuid compliant to RFC-4122
     uuid[6] = (uuid[6] & 0x0F) | 0x40; // uuid version

src/library_wasi.js

@@ -586,9 +586,8 @@ var WasiLibrary = {
           return (view) => crypto_module['randomFillSync'](view);
         }
         // very old nodejs with the original crypto API
-        var randomBytes = crypto_module['randomBytes'];
         return (view) => (
-          view.set(randomBytes(view.byteLength)),
+          view.set(crypto_module['randomBytes'](view.byteLength)),
           // Return the original view to match modern native implementations.
           view
         );

test/other/codesize/test_codesize_cxx_ctors1.gzsize

@@ -1 +1 @@
-8408
+8405

test/other/codesize/test_codesize_cxx_ctors1.jssize

@@ -1 +1 @@
-20486
+20468

test/other/codesize/test_codesize_cxx_ctors2.gzsize

@@ -1 +1 @@
-8392
+8390

test/other/codesize/test_codesize_cxx_ctors2.jssize

@@ -1 +1 @@
-20454
+20436

test/other/codesize/test_codesize_cxx_except.gzsize

@@ -1 +1 @@
-9413
+9412

test/other/codesize/test_codesize_cxx_except.jssize

@@ -1 +1 @@
-24255
+24237

test/other/codesize/test_codesize_cxx_except_wasm.gzsize

@@ -1 +1 @@
-8374
+8370

test/other/codesize/test_codesize_cxx_except_wasm.jssize

@@ -1 +1 @@
-20379
+20361

test/other/codesize/test_codesize_cxx_except_wasm_exnref.gzsize

@@ -1 +1 @@
-8374
+8370

test/other/codesize/test_codesize_cxx_except_wasm_exnref.jssize

@@ -1 +1 @@
-20379
+20361

test/other/codesize/test_codesize_cxx_lto.gzsize

@@ -1 +1 @@
-8406
+8404

test/other/codesize/test_codesize_cxx_lto.jssize

@@ -1 +1 @@
-20510
+20492

test/other/codesize/test_codesize_cxx_mangle.gzsize

@@ -1 +1 @@
-9417
+9416

test/other/codesize/test_codesize_cxx_mangle.jssize

@@ -1 +1 @@
-24255
+24237

test/other/codesize/test_codesize_cxx_noexcept.gzsize

@@ -1 +1 @@
-8408
+8405

test/other/codesize/test_codesize_cxx_noexcept.jssize

@@ -1 +1 @@
-20486
+20468

test/other/codesize/test_codesize_cxx_wasmfs.gzsize

@@ -1 +1 @@
-3651
+3646

test/other/codesize/test_codesize_cxx_wasmfs.jssize

@@ -1 +1 @@
-7910
+7892

test/other/codesize/test_codesize_files_js_fs.gzsize

@@ -1 +1 @@
-7704
+7699

test/other/codesize/test_codesize_files_js_fs.jssize

@@ -1 +1 @@
-18980
+18962

test/other/codesize/test_codesize_files_wasmfs.gzsize

@@ -1 +1 @@
-2882
+2880

test/other/codesize/test_codesize_files_wasmfs.jssize

@@ -1 +1 @@
-6198
+6180

test/test_other.py

@@ -15243,10 +15243,10 @@ def test_uuid(self):
 
     js_out = read_file('test_uuid.js')
 
-    # Check that test.js compiled with --closure 1 contains ").randomBytes" and
-    # "window.crypto.getRandomValues"
-    self.assertContained(").randomBytes", js_out)
-    self.assertContained("window.crypto.getRandomValues", js_out)
+    # Check that test.js compiled with --closure 1 contains ".randomBytes(" and
+    # ".getRandomValues("
+    self.assertContained(".randomBytes(", js_out)
+    self.assertContained(".getRandomValues(", js_out)
 
   def test_wasm64_no_asan(self):
     err = self.expect_fail([EMCC, test_file('hello_world.c'), '-sMEMORY64', '-fsanitize=address'])