Change MathRNG internal loop, and update SDK constraints

CHANGELOG.md

@@ -1,5 +1,12 @@
 # Changelog
 
+v4.3.0
+
+* Update SDK constraints to >= 3.0.0
+* Update Meta package to 1.11.0
+* **[PARTIAL BREAKING CHANGE]** Changing MathRNG implementation to use 4 nextints, instead of 16 for optimization to match CryptoRNG. This will affect regenerating the same UUID from the same seed.
+  * If you need the old behavior, please use MathRNGDeprecated() instead.
+
 v4.2.2
 
 * Fix CryptoRNG on Web generating a random number 0 always

lib/rng.dart

@@ -30,6 +30,31 @@ class MathRNG extends RNG {
 
   const MathRNG({this.seed = -1});
 
+  @override
+  Uint8List generateInternal() {
+    final b = Uint8List(16);
+    final rand = (seed == -1) ? _random : Random(seed);
+
+    for (var i = 0; i < 16; i += 4) {
+      var k = rand.nextInt(pow(2, 32).toInt());
+      b[i] = k;
+      b[i + 1] = k >> 8;
+      b[i + 2] = k >> 16;
+      b[i + 3] = k >> 24;
+    }
+
+    return b;
+  }
+}
+
+/// Math.Random()-based RNG. All platforms, fast, not cryptographically
+/// strong. Optional [seed] can be passed on creation.
+class MathRNGDeprecated extends RNG {
+  static final _random = Random();
+  final int seed;
+
+  const MathRNGDeprecated({this.seed = -1});
+
   @override
   Uint8List generateInternal() {
     final b = Uint8List(16);

pubspec.yaml

@@ -1,15 +1,15 @@
 name: uuid
-version: 4.2.2
+version: 4.3.0
 description: >
   RFC4122 (v1, v4, v5, v6, v7, v8) UUID Generator and Parser for Dart
 documentation: https://daegalus.github.io/dart-uuid/index.html
 repository: https://github.com/Daegalus/dart-uuid
 environment:
-  sdk: ">=2.14.0 <4.0.0"
+  sdk: ">=3.0.0 <4.0.0"
 dependencies:
   crypto: ^3.0.0
   sprintf: ^7.0.0
-  meta: ^1.9.1
+  meta: ^1.11.0
 dev_dependencies:
   lints: ^3.0.0
   test: ^1.24.9

test/uuid_test.dart

@@ -120,7 +120,7 @@ void main() {
       var u0 = uuid.v4(options: {
         'rng': MathRNG(seed: 1),
       });
-      var u1 = 'a473ff7b-b3cd-4899-a04d-ea0fbd30a72e';
+      var u1 = 'a462502a-73af-4e41-bfc4-05957b7030dd';
       expect(u0, equals(u1));
     });
 
@@ -130,7 +130,7 @@ void main() {
         'rng': MathRNG(seed: 1),
       });
 
-      var u1 = 'a473ff7b-b3cd-4899-a04d-ea0fbd30a72e';
+      var u1 = 'a462502a-73af-4e41-bfc4-05957b7030dd';
       expect(Uuid.unparse(buffer), equals(u1));
     });
 
@@ -363,7 +363,7 @@ void main() {
       var options = V7Options(1321651533573, rand);
       var id = uuid.v7(config: options);
 
-      expect(id, equals('0133b891-f705-7473-bf7b-b3cdc899a04d'));
+      expect(id, equals('0133b891-f705-7462-902a-73af3e41ffc4'));
     });
 
     test('Generate lots of codes to see if we get v7 collisions.', () {
@@ -575,7 +575,7 @@ void main() {
       for (final testCase in {
         'Tuesday, February 22, 2022 2:22:22.222000 PM GMT-05:00': [
           DateTime.fromMillisecondsSinceEpoch(1645557742222).toUtc(),
-          '20220222-1922-8422-B222-B3CDC899A04D'
+          '20220222-1922-8422-9222-73AF3E41FFC4'
         ],
       }.entries) {
         test(testCase.key, () {