Initial commit

Security/SecRNG.cs

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+/*
+ * Secucore
+ * 
+ * Copyright (C) 2023 Trevor Hall
+ * All rights reserved.
+ *
+ * This software may be modified and distributed under the terms
+ * of the MIT license.
+ * 
+ */
+
+using System;
+
+namespace SecuCore.Security
+{
+    class SecRNG
+    {
+        private RStep stepper;
+        public SecRNG()
+        {
+            uint seed = BitConverter.ToUInt32(Guid.NewGuid().ToByteArray());
+            stepper = new RStep(seed);
+        }
+
+        public void GetRandomBytes(byte[] target, int offset, int length)
+        {
+            int ceil = offset + length - 1;
+            int i = offset;
+            while(i <= ceil)
+            {
+                uint nu = stepper.Next32();
+                if (i > ceil) break;
+                target[i++] = (byte)((nu >> 24) & 0xff);
+                if (i > ceil) break;
+                target[i++] = (byte)((nu >> 16) & 0xff);
+                if (i > ceil) break;
+                target[i++] = (byte)((nu >> 8) & 0xff);
+                if (i > ceil) break;
+                target[i++] = (byte)((nu) & 0xff);
+            }
+        }
+    }
+
+    public struct RStep
+    {
+        const uint iY = 842502087, iZ = 3579807591, iW = 273326509;
+        uint x;
+        uint y;
+        uint z;
+        uint w;
+        uint next;
+
+        public RStep(uint seed)
+        {
+            x = seed;
+            y = iY;
+            z = iZ;
+            w = iW;
+            next = 0;
+            Step();
+        }
+
+        public void Step()
+        {
+            uint t = (x ^ (x << 11));
+            x = y;
+            y = z;
+            z = w;
+            next = (w = (w ^ (w >> 19)) ^ (t ^ (t >> 8)));
+        }
+        public uint Next32()
+        {
+            Step();
+            return next;
+        }
+    }
+}