Add RngLib.

Signed-off-by: Jiewen Yao <jiewen.yao@intel.com>

Author: jyao1

GNUmakefile

@@ -32,6 +32,7 @@ all:
 	@"$(MAKE)" $(MAKE_FLAGS) -f $(WORKSPACE)/OsStub/DebugLib/$(MAKEFILE) ARCH=$(ARCH) TARGET=$(TARGET) TOOLCHAIN=$(TOOLCHAIN) CRYPTO=$(CRYPTO)
 	@"$(MAKE)" $(MAKE_FLAGS) -f $(WORKSPACE)/OsStub/BaseCryptLib$(CRYPTO)/$(MAKEFILE) ARCH=$(ARCH) TARGET=$(TARGET) TOOLCHAIN=$(TOOLCHAIN) CRYPTO=$(CRYPTO)
 	@"$(MAKE)" $(MAKE_FLAGS) -f $(WORKSPACE)/OsStub/$(CRYPTO)Lib/$(MAKEFILE) ARCH=$(ARCH) TARGET=$(TARGET) TOOLCHAIN=$(TOOLCHAIN) CRYPTO=$(CRYPTO)
+	@"$(MAKE)" $(MAKE_FLAGS) -f $(WORKSPACE)/OsStub/RngLib/$(MAKEFILE) ARCH=$(ARCH) TARGET=$(TARGET) TOOLCHAIN=$(TOOLCHAIN) CRYPTO=$(CRYPTO)
 	@"$(MAKE)" $(MAKE_FLAGS) -f $(WORKSPACE)/OsStub/MemoryAllocationLib/$(MAKEFILE) ARCH=$(ARCH) TARGET=$(TARGET) TOOLCHAIN=$(TOOLCHAIN) CRYPTO=$(CRYPTO)
 	@"$(MAKE)" $(MAKE_FLAGS) -f $(WORKSPACE)/OsTest/SpdmRequesterTest/$(MAKEFILE) ARCH=$(ARCH) TARGET=$(TARGET) TOOLCHAIN=$(TOOLCHAIN) CRYPTO=$(CRYPTO)
 	@"$(MAKE)" $(MAKE_FLAGS) -f $(WORKSPACE)/OsTest/SpdmResponderTest/$(MAKEFILE) ARCH=$(ARCH) TARGET=$(TARGET) TOOLCHAIN=$(TOOLCHAIN) CRYPTO=$(CRYPTO)

Makefile

@@ -33,6 +33,7 @@ all:
 	@"$(MAKE)" $(MAKE_FLAGS) -f $(WORKSPACE)\OsStub\DebugLib\$(MAKEFILE) ARCH=$(ARCH) TARGET=$(TARGET) TOOLCHAIN=$(TOOLCHAIN) CRYPTO=$(CRYPTO)
 	@"$(MAKE)" $(MAKE_FLAGS) -f $(WORKSPACE)\OsStub\BaseCryptLib$(CRYPTO)\$(MAKEFILE) ARCH=$(ARCH) TARGET=$(TARGET) TOOLCHAIN=$(TOOLCHAIN) CRYPTO=$(CRYPTO)
 	@"$(MAKE)" $(MAKE_FLAGS) -f $(WORKSPACE)\OsStub\$(CRYPTO)Lib\$(MAKEFILE) ARCH=$(ARCH) TARGET=$(TARGET) TOOLCHAIN=$(TOOLCHAIN) CRYPTO=$(CRYPTO)
+	@"$(MAKE)" $(MAKE_FLAGS) -f $(WORKSPACE)\OsStub\RngLib\$(MAKEFILE) ARCH=$(ARCH) TARGET=$(TARGET) TOOLCHAIN=$(TOOLCHAIN) CRYPTO=$(CRYPTO)
 	@"$(MAKE)" $(MAKE_FLAGS) -f $(WORKSPACE)\OsStub\MemoryAllocationLib\$(MAKEFILE) ARCH=$(ARCH) TARGET=$(TARGET) TOOLCHAIN=$(TOOLCHAIN) CRYPTO=$(CRYPTO)
 	@"$(MAKE)" $(MAKE_FLAGS) -f $(WORKSPACE)\OsTest\SpdmRequesterTest\$(MAKEFILE) ARCH=$(ARCH) TARGET=$(TARGET) TOOLCHAIN=$(TOOLCHAIN) CRYPTO=$(CRYPTO)
 	@"$(MAKE)" $(MAKE_FLAGS) -f $(WORKSPACE)\OsTest\SpdmResponderTest\$(MAKEFILE) ARCH=$(ARCH) TARGET=$(TARGET) TOOLCHAIN=$(TOOLCHAIN) CRYPTO=$(CRYPTO)

OsStub/BaseCryptLibMbedTls/Rand/CryptRand.c

@@ -7,8 +7,7 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
 **/
 
 #include "InternalCryptLib.h"
-
-int rand ();
+#include <Library/RngLib.h>
 
 /**
   Sets up the seed value for the pseudorandom number generator.
@@ -56,19 +55,30 @@ RandomBytes (
   IN   UINTN  Size
   )
 {
-  UINTN Count = Size/4;
-  UINTN Final = Size%4;
-  UINTN Index = 0;
-  UINT32 Data32;
-
-  for (Index = 0; Index < Count; Index++) {
-    *(UINT32 *)(Output + Index * 4) = rand();
-  }
-  if (Final != 0) {
-    Data32 = rand();
-    CopyMem (Output + Count * 4, &Data32, Final);
+  BOOLEAN     Ret;
+  UINT64      TempRand;
+
+  Ret = FALSE;
+
+  while (Size > 0) {
+    // Use RngLib to get random number
+    Ret = GetRandomNumber64 (&TempRand);
+
+    if (!Ret) {
+      return Ret;
+    }
+    if (Size >= sizeof (TempRand)) {
+      *((UINT64*) Output) = TempRand;
+      Output += sizeof (UINT64);
+      Size -= sizeof (TempRand);
+    }
+    else {
+      CopyMem (Output, &TempRand, Size);
+      Size = 0;
+    }
   }
-  return TRUE;
+
+  return Ret;
 }
 
 int myrand( void *rng_state, unsigned char *output, size_t len )

OsStub/Include/Library/RngLib.h

@@ -0,0 +1,29 @@
+/** @file
+  Provides random number generator services.
+
+Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef __RNG_LIB_H__
+#define __RNG_LIB_H__
+
+/**
+  Generates a 64-bit random number.
+
+  if Rand is NULL, then ASSERT().
+
+  @param[out] Rand     Buffer pointer to store the 64-bit random value.
+
+  @retval TRUE         Random number generated successfully.
+  @retval FALSE        Failed to generate the random number.
+
+**/
+BOOLEAN
+EFIAPI
+GetRandomNumber64 (
+  OUT     UINT64                    *Rand
+  );
+
+#endif  // __RNG_LIB_H__