MdePkg: Add PeiRngLib

REF:https://github.com/tianocore/edk2/issues/10529

Adds a new PEI library instance for RngLib that uses the RNG services
provided by the RNG PPI.

This library instance will add a DEPEX on gEfiRngPpiGuid on modules
it links against. It can be used to allow PEIMs to get RNG support
over a dynamic interface.

Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>

MdePkg/Library/PeiRngLib/PeiRngLib.c

@@ -0,0 +1,229 @@
+/** @file
+  RNG library instance that uses the Random Number Generator (RNG) PPI to provide
+  random numbers.
+
+  Copyright (c) Microsoft Corporation.
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+**/
+
+#include <PiPei.h>
+#include <Library/BaseLib.h>
+#include <Library/DebugLib.h>
+#include <Library/PeiServicesLib.h>
+#include <Ppi/Rng.h>
+
+/**
+  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.
+
+  @param[out] Buffer      Buffer to receive the random number.
+  @param[in]  BufferSize  Number of bytes in Buffer.
+
+  @retval EFI_SUCCESS or underlying failure code.
+
+**/
+STATIC
+EFI_STATUS
+GenerateRandomNumberViaNist800Algorithm (
+  OUT UINT8  *Buffer,
+  IN  UINTN  BufferSize
+  )
+{
+  EFI_STATUS  Status;
+  RNG_PPI     *RngPpi;
+
+  RngPpi = NULL;
+
+  if (Buffer == NULL) {
+    DEBUG ((DEBUG_ERROR, "%a: Buffer == NULL.\n", __func__));
+    return EFI_INVALID_PARAMETER;
+  }
+
+  Status = PeiServicesLocatePpi (&gEfiRngPpiGuid, 0, NULL, (VOID **)&RngPpi);
+  if (EFI_ERROR (Status) || (RngPpi == NULL)) {
+    DEBUG ((DEBUG_ERROR, "%a: Could not locate RNG PPI, Status = %r\n", __func__, Status));
+    return Status;
+  }
+
+  Status = RngPpi->GetRNG (RngPpi, &gEfiRngAlgorithmSp80090Ctr256Guid, BufferSize, Buffer);
+  DEBUG ((DEBUG_INFO, "%a: GetRNG algorithm CTR-256 - Status = %r\n", __func__, Status));
+  if (!EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  Status = RngPpi->GetRNG (RngPpi, &gEfiRngAlgorithmSp80090Hmac256Guid, BufferSize, Buffer);
+  DEBUG ((DEBUG_INFO, "%a: GetRNG algorithm HMAC-256 - Status = %r\n", __func__, Status));
+  if (!EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  Status = RngPpi->GetRNG (RngPpi, &gEfiRngAlgorithmSp80090Hash256Guid, BufferSize, Buffer);
+  DEBUG ((DEBUG_INFO, "%a: GetRNG algorithm Hash-256 - Status = %r\n", __func__, Status));
+  if (!EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  Status = RngPpi->GetRNG (RngPpi, &gEfiRngAlgorithmRaw, BufferSize, Buffer);
+  DEBUG ((DEBUG_INFO, "%a: GetRNG algorithm Raw - Status = %r\n", __func__, Status));
+  if (!EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  // If all the other methods have failed, use the default method from the RngPpi
+  Status = RngPpi->GetRNG (RngPpi, NULL, BufferSize, Buffer);
+  DEBUG ((DEBUG_INFO, "%a: GetRNG algorithm default - Status = %r\n", __func__, 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", __func__, Status));
+
+  return Status;
+}
+
+/**
+  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, sizeof (UINT16));
+  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, sizeof (UINT32));
+  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, sizeof (UINT64));
+  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, 2 * sizeof (UINT64));
+  if (EFI_ERROR (Status)) {
+    return FALSE;
+  }
+
+  return TRUE;
+}
+
+/**
+  Get a GUID identifying the RNG algorithm implementation.
+
+  @param [out] RngGuid  If success, contains the GUID identifying
+                        the RNG algorithm implementation.
+
+  @retval EFI_SUCCESS             Success.
+  @retval EFI_UNSUPPORTED         Not supported.
+  @retval EFI_INVALID_PARAMETER   Invalid parameter.
+**/
+EFI_STATUS
+EFIAPI
+GetRngGuid (
+  GUID  *RngGuid
+  )
+{
+  // Similar to DxeRngLib, EFI_UNSUPPORTED is returned for this library instance since it is unknown
+  // which exact algorithm may be used for a given request.
+
+  return EFI_UNSUPPORTED;
+}

MdePkg/Library/PeiRngLib/PeiRngLib.inf

@@ -0,0 +1,41 @@
+## @file
+# PPI-based Instance of RNG (Random Number Generator) Library.
+#
+# This library instance requires a RNG PPI to be produced so that the module may use
+# it for RNG operations. A RNG PPI DEPEX will be placed on the module.
+#
+# Copyright (c) Microsoft Corporation.
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+##
+
+[Defines]
+  INF_VERSION           = 0x0001001B
+  BASE_NAME             = PeiRngLib
+  MODULE_UNI_FILE       = PeiRngLib.uni
+  FILE_GUID             = FF240232-C25D-4277-AB81-D6B0C51F2D25
+  VERSION_STRING        = 1.0
+  MODULE_TYPE           = PEIM
+  LIBRARY_CLASS         = RngLib | PEIM
+
+[Packages]
+  MdePkg/MdePkg.dec
+
+[LibraryClasses]
+  BaseLib
+  DebugLib
+  PeiServicesLib
+
+[Guids]
+  gEfiRngAlgorithmSp80090Ctr256Guid
+  gEfiRngAlgorithmSp80090Hash256Guid
+  gEfiRngAlgorithmSp80090Hmac256Guid
+  gEfiRngAlgorithmRaw
+
+[Sources]
+  PeiRngLib.c
+
+[Ppis]
+  gEfiRngPpiGuid  ## CONSUMES
+
+[Depex]
+  gEfiRngPpiGuid

MdePkg/Library/PeiRngLib/PeiRngLib.uni

@@ -0,0 +1,12 @@
+// @file
+// PEI Instance of the RNG (Random Number Generator) Library.
+//
+// A RngLib instance that uses the RNG PPI to provide random numbers.
+//
+// Copyright (c) Microsoft Corporation.
+// SPDX-License-Identifier: BSD-2-Clause-Patent
+//
+
+#string STR_MODULE_ABSTRACT     #language en-US "Instance of the RNG Library for PEI"
+
+#string STR_MODULE_DESCRIPTION  #language en-US "A library that uses the RNG PPI to provide random numbers"

MdePkg/MdePkg.dsc

@@ -138,6 +138,7 @@
 
   MdePkg/Library/JedecJep106Lib/JedecJep106Lib.inf
   MdePkg/Library/BaseFdtLib/BaseFdtLib.inf
+  MdePkg/Library/PeiRngLib/PeiRngLib.inf
 
   MdePkg/Library/StackCheckFailureHookLibNull/StackCheckFailureHookLibNull.inf
   MdePkg/Library/StackCheckLibNull/StackCheckLibNull.inf