[PATCH v7 2/5] MdePkg: BaseRngLibDxe: Add RngLib that uses RngDxe

["Matthew Carlson" <matthewfcarlson@gmail.com>]

From: Matthew Carlson <macarl@microsoft.com>

This adds a RngLib that uses the RngProtocol to provide randomness.
This means that the RngLib is meant to be used with DXE_DRIVERS.

Ref: https://github.com/tianocore/edk2/pull/845
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=1871

Cc: Ard Biesheuvel <ard.biesheuvel@arm.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Zhiguang Liu <zhiguang.liu@intel.com>
Signed-off-by: Matthew Carlson <matthewfcarlson@gmail.com>
---
 MdePkg/Library/DxeRngLib/DxeRngLib.c   | 206 ++++++++++++++++++++
 MdePkg/Library/DxeRngLib/DxeRngLib.inf |  37 ++++
 MdePkg/MdePkg.dsc                      |   4 +-
 3 files changed, 246 insertions(+), 1 deletion(-)

diff --git a/MdePkg/Library/DxeRngLib/DxeRngLib.c b/MdePkg/Library/DxeRngLib/DxeRngLib.c
new file mode 100644
index 000000000000..0bd6585357b5
--- /dev/null
+++ b/MdePkg/Library/DxeRngLib/DxeRngLib.c
@@ -0,0 +1,206 @@
+/** @file
+ Provides an implementation of the library class RngLib that uses the Rng protocol.
+
+ Copyright (c) Microsoft Corporation. All rights reserved.
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+#include <Uefi.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/DebugLib.h>
+#include <Library/RngLib.h>
+#include <Protocol/Rng.h>
+
+/**
+Routine Description:
+
+    Generates a random number via the NIST
+    800-9A algorithm.  Refer to
+    http://csrc.nist.gov/groups/STM/cavp/documents/drbg/DRBGVS.pdf
+    for more information.
+
+    Arguments:
+
+    Buffer      -- Buffer to receive the random number.
+    BufferSize  -- Number of bytes in Buffer.
+
+Return Value:
+
+    EFI_SUCCESS or underlying failure code.
+
+**/
+STATIC
+EFI_STATUS
+GenerateRandomNumberViaNist800Algorithm (
+  OUT UINT8 *Buffer,
+  IN  UINTN  BufferSize
+  )
+{
+  EFI_STATUS        Status;
+  EFI_RNG_PROTOCOL *RngProtocol;
+
+  RngProtocol = NULL;
+
+  if (Buffer == NULL) {
+      DEBUG((DEBUG_ERROR, "[%a] Buffer == NULL.\n", __FUNCTION__));
+      return EFI_INVALID_PARAMETER;
+  }
+
+  Status = gBS->LocateProtocol (&gEfiRngProtocolGuid, NULL, (VOID **)&RngProtocol);
+  if (EFI_ERROR (Status) || RngProtocol == NULL) {
+      DEBUG((DEBUG_ERROR, "%a: Could not locate RNG prototocol, Status = %r\n", __FUNCTION__, Status));
+      return Status;
+  }
+
+  Status = RngProtocol->GetRNG (RngProtocol, &gEfiRngAlgorithmSp80090Ctr256Guid, BufferSize, Buffer);
+  DEBUG((DEBUG_INFO, "%a: GetRNG algorithm CTR-256 - Status = %r\n", __FUNCTION__, Status));
+  if(!EFI_ERROR(Status)) {
+    return Status;
+  }
+
+  Status = RngProtocol->GetRNG (RngProtocol, &gEfiRngAlgorithmSp80090Hmac256Guid, BufferSize, Buffer);
+  DEBUG((DEBUG_INFO, "%a: GetRNG algorithm HMAC-256 - Status = %r\n", __FUNCTION__, Status));
+  if(!EFI_ERROR(Status)) {
+    return Status;
+  }
+
+  Status = RngProtocol->GetRNG (RngProtocol, &gEfiRngAlgorithmSp80090Hash256Guid, BufferSize, Buffer);
+  DEBUG((DEBUG_INFO, "%a: GetRNG algorithm Hash-256 - Status = %r\n", __FUNCTION__, Status));
+  if (!EFI_ERROR(Status)) {
+    return Status;
+  }
+  // If all the other methods have failed, use the default method from the RngProtocol
+  Status = RngProtocol->GetRNG (RngProtocol, NULL, BufferSize, Buffer);
+  DEBUG((DEBUG_INFO, "%a: GetRNG algorithm Hash-256 - Status = %r\n", __FUNCTION__, Status));
+  if (!EFI_ERROR(Status)) {
+    return Status;
+  }
+  // If we get to this point, we have failed
+  DEBUG((DEBUG_ERROR, "%a: GetRNG() failed, staus = %r\n", __FUNCTION__, Status));
+
+  return Status;
+}// GenerateRandomNumberViaNist800Algorithm()
+
+
+/**
+  Generates a 16-bit random number.
+
+  if Rand is NULL, return FALSE.
+
+  @param[out] Rand     Buffer pointer to store the 16-bit random value.
+
+  @retval TRUE         Random number generated successfully.
+  @retval FALSE        Failed to generate the random number.
+
+**/
+BOOLEAN
+EFIAPI
+GetRandomNumber16 (
+  OUT     UINT16                    *Rand
+  )
+{
+  EFI_STATUS Status;
+
+  if (Rand == NULL)
+  {
+    return FALSE;
+  }
+
+  Status = GenerateRandomNumberViaNist800Algorithm ((UINT8 *)Rand, 2);
+  if (EFI_ERROR (Status))
+  {
+    return FALSE;
+  }
+  return TRUE;
+}
+
+/**
+  Generates a 32-bit random number.
+
+  if Rand is NULL, return FALSE.
+
+  @param[out] Rand     Buffer pointer to store the 32-bit random value.
+
+  @retval TRUE         Random number generated successfully.
+  @retval FALSE        Failed to generate the random number.
+
+**/
+BOOLEAN
+EFIAPI
+GetRandomNumber32 (
+  OUT     UINT32                    *Rand
+  )
+{
+  EFI_STATUS Status;
+
+  if (Rand == NULL) {
+    return FALSE;
+  }
+
+  Status = GenerateRandomNumberViaNist800Algorithm ((UINT8 *)Rand, 4);
+  if (EFI_ERROR (Status)) {
+    return FALSE;
+  }
+  return TRUE;
+}
+
+/**
+  Generates a 64-bit random number.
+
+  if Rand is NULL, return FALSE.
+
+  @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
+  )
+{
+  EFI_STATUS Status;
+
+  if (Rand == NULL)
+  {
+    return FALSE;
+  }
+
+  Status = GenerateRandomNumberViaNist800Algorithm ((UINT8 *)Rand, 8);
+  if (EFI_ERROR (Status)) {
+    return FALSE;
+  }
+  return TRUE;
+}
+
+/**
+  Generates a 128-bit random number.
+
+  if Rand is NULL, return FALSE.
+
+  @param[out] Rand     Buffer pointer to store the 128-bit random value.
+
+  @retval TRUE         Random number generated successfully.
+  @retval FALSE        Failed to generate the random number.
+
+**/
+BOOLEAN
+EFIAPI
+GetRandomNumber128 (
+  OUT     UINT64                    *Rand
+  )
+{
+  EFI_STATUS Status;
+
+  if (Rand == NULL) {
+    return FALSE;
+  }
+
+  Status = GenerateRandomNumberViaNist800Algorithm ((UINT8 *)Rand, 16);
+  if (EFI_ERROR (Status)) {
+    return FALSE;
+  }
+  return TRUE;
+}
diff --git a/MdePkg/Library/DxeRngLib/DxeRngLib.inf b/MdePkg/Library/DxeRngLib/DxeRngLib.inf
new file mode 100644
index 000000000000..d0dc381c20c3
--- /dev/null
+++ b/MdePkg/Library/DxeRngLib/DxeRngLib.inf
@@ -0,0 +1,37 @@
+# @file
+# Provides implementation of the library class RngLib that uses the RngProtocol
+#
+# @copyright
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+  INF_VERSION     = 0x00010017
+  BASE_NAME       = DxeRngLib
+  FILE_GUID       = FF9F84C5-A33E-44E3-9BB5-0D654B2D4149
+  MODULE_TYPE     = DXE_DRIVER
+  VERSION_STRING  = 1.0
+  LIBRARY_CLASS   = RngLib|DXE_DRIVER UEFI_APPLICATION UEFI_DRIVER
+
+[Packages]
+  MdePkg/MdePkg.dec
+
+[Sources]
+  DxeRngLib.c
+
+[LibraryClasses]
+  DebugLib
+  UefiBootServicesTableLib
+
+[Protocols]
+  gEfiRngProtocolGuid                 ## CONSUMES
+
+[Depex]
+  gEfiRngProtocolGuid
+
+[Guids]
+  gEfiRngAlgorithmSp80090Ctr256Guid
+  gEfiRngAlgorithmSp80090Hash256Guid
+  gEfiRngAlgorithmSp80090Hmac256Guid
diff --git a/MdePkg/MdePkg.dsc b/MdePkg/MdePkg.dsc
index d7ba3a730909..2c3b7966b086 100644
--- a/MdePkg/MdePkg.dsc
+++ b/MdePkg/MdePkg.dsc
@@ -62,8 +62,10 @@
   MdePkg/Library/BasePostCodeLibPort80/BasePostCodeLibPort80.inf
   MdePkg/Library/BasePrintLib/BasePrintLib.inf
   MdePkg/Library/BaseReportStatusCodeLibNull/BaseReportStatusCodeLibNull.inf
-  MdePkg/Library/BaseRngLibTimerLib/BaseRngLibTimerLib.inf
+  MdePkg/Library/DxeRngLib/DxeRngLib.inf
   MdePkg/Library/BaseRngLibNull/BaseRngLibNull.inf
+  MdePkg/Library/BaseRngLibTimerLib/BaseRngLibTimerLib.inf
+
   MdePkg/Library/BaseSerialPortLibNull/BaseSerialPortLibNull.inf
   MdePkg/Library/BaseSynchronizationLib/BaseSynchronizationLib.inf
   MdePkg/Library/BaseTimerLibNullTemplate/BaseTimerLibNullTemplate.inf
-- 
2.27.0.windows.1