[PATCH] ntoskrnl.exe: Implement ExUuidCreate().

[Zhiyi Zhang]

Signed-off-by: Zhiyi Zhang 
---
 dlls/ntoskrnl.exe/ntoskrnl.c        | 33 +++++++++++++++++++++++++++++++++
 dlls/ntoskrnl.exe/ntoskrnl.exe.spec |  2 +-
 include/ddk/ntddk.h                 |  2 ++
 3 files changed, 36 insertions(+), 1 deletion(-)

diff --git a/dlls/ntoskrnl.exe/ntoskrnl.c b/dlls/ntoskrnl.exe/ntoskrnl.c
index 4b62660750..1d36620fc4 100644
--- a/dlls/ntoskrnl.exe/ntoskrnl.c
+++ b/dlls/ntoskrnl.exe/ntoskrnl.c
@@ -3983,3 +3983,36 @@ void WINAPI KeLeaveGuardedRegion(void)
 {
     FIXME("\n");
 }
+
+/*************************************************************************
+ *           ExUuidCreate            (NTOSKRNL.@)
+ *
+ * Creates a 128bit UUID.
+ *
+ * RETURNS
+ *
+ *  STATUS_SUCCESS if successful.
+ *  RPC_NT_UUID_LOCAL_ONLY if UUID is only locally unique.
+ *
+ * NOTES
+ *
+ *  Follows RFC 4122, section 4.4 (Algorithms for Creating a UUID from
+ *  Truly Random or Pseudo-Random Numbers)
+ */
+NTSTATUS WINAPI ExUuidCreate(UUID *uuid)
+{
+    /* RtlGenRandom */
+    SystemFunction036(uuid, sizeof(*uuid));
+    /* Clear the version bits and set the version (4) */
+    uuid->Data3 &= 0x0fff;
+    uuid->Data3 |= (4 << 12);
+    /* Set the topmost bits of Data4 (clock_seq_hi_and_reserved) as
+     * specified in RFC 4122, section 4.4.
+     */
+    uuid->Data4[0] &= 0x3f;
+    uuid->Data4[0] |= 0x80;
+
+    TRACE("%s\n", debugstr_guid(uuid));
+
+    return STATUS_SUCCESS;
+}
diff --git a/dlls/ntoskrnl.exe/ntoskrnl.exe.spec b/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
index d087422605..73ebbd91ef 100644
--- a/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
+++ b/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
@@ -185,7 +185,7 @@
 @ stub ExSystemExceptionFilter
 @ stdcall ExSystemTimeToLocalTime(ptr ptr) RtlSystemTimeToLocalTime
 @ stub ExUnregisterCallback
-@ stub ExUuidCreate
+@ stdcall ExUuidCreate(ptr)
 @ stub ExVerifySuite
 @ stub ExWindowStationObjectType
 @ stub Exi386InterlockedDecrementLong
diff --git a/include/ddk/ntddk.h b/include/ddk/ntddk.h
index 452e510fdc..fb8cacc188 100644
--- a/include/ddk/ntddk.h
+++ b/include/ddk/ntddk.h
@@ -202,7 +202,9 @@ typedef NTSTATUS (WINAPI *PIO_QUERY_DEVICE_ROUTINE)(PVOID,PUNICODE_STRING,INTERF
             PKEY_VALUE_FULL_INFORMATION*,CONFIGURATION_TYPE,ULONG,PKEY_VALUE_FULL_INFORMATION*);
 typedef void (NTAPI EXPAND_STACK_CALLOUT)(void*);
 typedef EXPAND_STACK_CALLOUT *PEXPAND_STACK_CALLOUT;
+typedef GUID UUID;

+NTSTATUS  WINAPI ExUuidCreate(UUID*);
 NTSTATUS  WINAPI IoQueryDeviceDescription(PINTERFACE_TYPE,PULONG,PCONFIGURATION_TYPE,PULONG,
                                   PCONFIGURATION_TYPE,PULONG,PIO_QUERY_DEVICE_ROUTINE,PVOID);
 void      WINAPI IoRegisterDriverReinitialization(PDRIVER_OBJECT,PDRIVER_REINITIALIZE,PVOID);