[HLE] Add RandomExports HLE (#413)

src/SharpEmu.Libs/Random/RandomExports.cs

@@ -0,0 +1,39 @@
+// Copyright (C) 2026 SharpEmu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+using System.Security.Cryptography;
+using SharpEmu.HLE;
+
+namespace SharpEmu.Libs.Random;
+
+public static class RandomExports
+{
+    private const int RandomErrorInvalid = unchecked((int)0x817C0016);
+    private const int MaxRandomBytes = 64;
+
+    [SysAbiExport(
+        Nid = "PI7jIZj4pcE",
+        ExportName = "sceRandomGetRandomNumber",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceRandom")]
+    public static int RandomGetRandomNumber(CpuContext ctx)
+    {
+        var destination = ctx[CpuRegister.Rdi];
+        var size = ctx[CpuRegister.Rsi];
+        if ((destination == 0 && size != 0) || size > MaxRandomBytes)
+        {
+            return ctx.SetReturn(RandomErrorInvalid);
+        }
+
+        if (size == 0)
+        {
+            return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_OK);
+        }
+
+        Span<byte> bytes = stackalloc byte[(int)size];
+        RandomNumberGenerator.Fill(bytes);
+        return ctx.Memory.TryWrite(destination, bytes)
+            ? ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_OK)
+            : ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
+    }
+}