Enhancements to entropy generation for the Win32 VFS.

FossilOrigin-Name: 26190b3c63e18f3116deeb59a58d9b5de48e8eea

1 files changed, 34 insertions, 1 deletions

diff --git a/src/os_win.c b/src/os_win.c
index c938a4d7d..7463778a2 100644
--- a/src/os_win.c
+++ b/src/os_win.c
@@ -1066,6 +1066,23 @@ static struct win_syscall {
         SQLITE_WIN32_VOLATILE*, LONG,LONG))aSyscall[76].pCurrent)
 #endif /* defined(InterlockedCompareExchange) */
 
+#if !SQLITE_OS_WINCE && !SQLITE_OS_WINRT && SQLITE_WIN32_USE_UUID
+  { "UuidCreate",               (SYSCALL)UuidCreate,             0 },
+#else
+  { "UuidCreate",               (SYSCALL)0,                      0 },
+#endif
+
+#define osUuidCreate ((RPC_STATUS(RPC_ENTRY*)(UUID*))aSyscall[77].pCurrent)
+
+#if !SQLITE_OS_WINCE && !SQLITE_OS_WINRT && SQLITE_WIN32_USE_UUID
+  { "UuidCreateSequential",     (SYSCALL)UuidCreateSequential,   0 },
+#else
+  { "UuidCreateSequential",     (SYSCALL)0,                      0 },
+#endif
+
+#define osUuidCreateSequential \
+        ((RPC_STATUS(RPC_ENTRY*)(UUID*))aSyscall[78].pCurrent)
+
 }; /* End of the overrideable system calls */
 
 /*
@@ -5345,6 +5362,22 @@ static int winRandomness(sqlite3_vfs *pVfs, int nBuf, char *zBuf){
     n += sizeof(i);
   }
 #endif
+#if !SQLITE_OS_WINCE && !SQLITE_OS_WINRT && SQLITE_WIN32_USE_UUID
+  if( sizeof(UUID)<=nBuf-n ){
+    UUID id;
+    memset(&id, 0, sizeof(UUID));
+    osUuidCreate(&id);
+    memcpy(zBuf, &id, sizeof(UUID));
+    n += sizeof(UUID);
+  }
+  if( sizeof(UUID)<=nBuf-n ){
+    UUID id;
+    memset(&id, 0, sizeof(UUID));
+    osUuidCreateSequential(&id);
+    memcpy(zBuf, &id, sizeof(UUID));
+    n += sizeof(UUID);
+  }
+#endif
   return n;
 }
 
@@ -5522,7 +5555,7 @@ int sqlite3_os_init(void){
 
   /* Double-check that the aSyscall[] array has been constructed
   ** correctly.  See ticket [bb3a86e890c8e96ab] */
-  assert( ArraySize(aSyscall)==77 );
+  assert( ArraySize(aSyscall)==79 );
 
   /* get memory map allocation granularity */
   memset(&winSysInfo, 0, sizeof(SYSTEM_INFO));