[+] Linux and BSD specific RNG

[*] Improved UNIX rng read check

Source/AuProcAddresses.Linux.cpp

@@ -8,6 +8,7 @@
 #include <RuntimeInternal.hpp>
 #include <sys/syscall.h>
 #include <linux/futex.h>
+#include <sys/random.h>
 
 namespace Aurora
 {
@@ -185,4 +186,23 @@ namespace Aurora
     {
         return syscall(SYS_io_cancel, ctx_id, iocb, result);
     }
+
+    ssize_t sys_getrandom(void *pBuffer, size_t uLength)
+    {
+        static AuUInt32 gShouldNotGetRand {};
+        ssize_t ret {};
+
+        if (gShouldNotGetRand)
+        {
+            return ENOSYS;
+        }
+
+        ret = syscall(SYS_getrandom, pBuffer, uLength, 1);
+        if (ret == ENOSYS)
+        {
+            gShouldNotGetRand = 1;
+        }
+        
+        return ret;
+    }
 }

Source/AuProcAddresses.Linux.hpp

@@ -7,7 +7,6 @@
 ***/
 #pragma once
 
-
 #include <linux/aio_abi.h>
 
 struct robust_list_head;
@@ -39,7 +38,6 @@ namespace Aurora
     
     int futex_wait(uint32_t *addr, uint32_t expected);
 
-
     int io_submit(aio_context_t ctx, long nr, struct iocb **iocbpp);
     
     int io_cancel(aio_context_t ctx_id, struct iocb *iocb,
@@ -52,4 +50,6 @@ namespace Aurora
     int io_getevents(aio_context_t ctx, long min_nr, long max_nr,
                      struct io_event *events,
                      struct timespec *timeout);
+
+    ssize_t sys_getrandom(void *pBuffer, size_t uLength);
 }

Source/RNG/AuRNGEntropy.cpp

@@ -18,14 +18,14 @@
         #define BCRYPT_RNG_ALG_HANDLE ((BCRYPT_ALG_HANDLE) 0x00000081)
     #endif
 
-    #define USE_OLD_NTCRYPT
+    #define AURORA_RNG_HAS_OLD_WINCRYPT
 #endif
 
 #if defined(AURORA_IS_MODERNNT_DERIVED)
     #include <bcrypt.h>
 #endif
 
-#if defined(USE_OLD_NTCRYPT)
+#if defined(AURORA_RNG_HAS_OLD_WINCRYPT)
     #include <wincrypt.h>
 #endif
 
@@ -34,6 +34,11 @@
     #include <fcntl.h>
 #endif
 
+#if defined(AURORA_IS_BSD_DERIVED)
+    #include <stdlib.h>
+    #define AURORA_RND_HAS_ARC4
+#endif
+
 #include "AuWELL.hpp"
 
 namespace Aurora::RNG
@@ -62,18 +67,24 @@ namespace Aurora::RNG
             return 0;
         }
 
-        return ::read(gDevURand, pBuf, uLen);
+        int iRet = ::read(gDevURand, pBuf, uLen);
+        if (iRet <= 0)
+        {
+            return 0;
+        }
+
+        return AuUInt32(iRet);
     }
 
 #elif defined(AURORA_IS_MODERNNT_DERIVED)
     
-    #if defined(USE_OLD_NTCRYPT)
+    #if defined(AURORA_RNG_HAS_OLD_WINCRYPT)
     static HCRYPTPROV gCryptoProv;
     #endif
 
     void EntropyInit()
     {
-    #if defined(USE_OLD_NTCRYPT)
+    #if defined(AURORA_RNG_HAS_OLD_WINCRYPT)
         if (pBCryptGenRandom)
         {
             return;
@@ -136,7 +147,7 @@ namespace Aurora::RNG
             }
         }
 
-    #if defined(USE_OLD_NTCRYPT)
+    #if defined(AURORA_RNG_HAS_OLD_WINCRYPT)
         if (gCryptoProv)
         {
             if (pCryptGenRandom(gCryptoProv, uLen, pBuf))
@@ -225,6 +236,17 @@ namespace Aurora::RNG
             return x;
         }
     #elif defined(AURORA_IS_POSIX_DERIVED)
+        #if defined(AURORA_IS_LINUX_DERIVED)
+            x = sys_getrandom(pBuffer, uBytes);
+            if (x > 0)
+            {
+                return x;
+            }
+        #endif
+        #if defined(AURORA_RND_HAS_ARC4)
+            arc4random_buf(pBuffer, uBytes);
+            return uBytes;
+        #endif
         x = RngUnix(pBuffer, uBytes);
         if (x != 0)
         {
@@ -247,7 +269,7 @@ namespace Aurora::RNG
             ::close(gDevURand);
             gDevURand = -1;
         }
-    #elif defined(AURORA_IS_MODERNNT_DERIVED) && defined(USE_OLD_NTCRYPT)
+    #elif defined(AURORA_IS_MODERNNT_DERIVED) && defined(AURORA_RNG_HAS_OLD_WINCRYPT)
         if (pBCryptGenRandom)
         {
             return;