SecurityPkg: Integrate new RngLib into RngDxe

Use the new RngLib to provide the IA32/X64 random data for RngDxe.
Remove x86 specific functions from RdRand files.
Simplify RngDxe by using WriteUnaligned64 for all platforms.
Use GetRandomNumber128 in RngDxe to leverage 128 bit support provided
by some HW RNG devices.

(Sync patch r18591 from main trunk.)

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Thomas Palmer <thomas.palmer@hpe.com>
Reviewed-by: Samer El-Haj-Mahmoud <elhaj@hpe.com>
Reviewed-by: Michael Kinney <michael.d.kinney@intel.com>
Reviewed-by: Chao Zhang <chao.b.zhang@intel.com>
Reviewed-by: Qin Long <qin.long@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/branches/UDK2015@18792 6f19259b-4bc3-4df7-8a09-765794883524

1 files changed, 17 insertions, 239 deletions

diff --git a/SecurityPkg/RandomNumberGenerator/RngDxe/RdRand.c b/SecurityPkg/RandomNumberGenerator/RngDxe/RdRand.c
index 7e618dc91f..395b8867c8 100644
--- a/SecurityPkg/RandomNumberGenerator/RngDxe/RdRand.c
+++ b/SecurityPkg/RandomNumberGenerator/RngDxe/RdRand.c
@@ -2,6 +2,7 @@
   Support routines for RDRAND instruction access.

 

 Copyright (c) 2013, Intel Corporation. All rights reserved.<BR>

+(C) Copyright 2015 Hewlett Packard Enterprise Development LP<BR>

 This program and the accompanying materials

 are licensed and made available under the terms and conditions of the BSD License

 which accompanies this distribution.  The full text of the license may be found at

@@ -11,177 +12,11 @@ THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

 

 **/

+#include <Library/RngLib.h>

 

 #include "RdRand.h"

 #include "AesCore.h"

 

-//

-// Bit mask used to determine if RdRand instruction is supported.

-//

-#define RDRAND_MASK    0x40000000

-

-/**

-  Determines whether or not RDRAND instruction is supported by the host hardware.

-

-  @retval EFI_SUCCESS          RDRAND instruction supported.

-  @retval EFI_UNSUPPORTED      RDRAND instruction not supported.

-

-**/

-EFI_STATUS

-EFIAPI

-IsRdRandSupported (

-  VOID

-  )

-{

-  EFI_STATUS  Status;

-  UINT32      RegEax;

-  UINT32      RegEbx;

-  UINT32      RegEcx;

-  UINT32      RegEdx;

-  BOOLEAN     IsIntelCpu;

-

-  Status     = EFI_UNSUPPORTED;

-  IsIntelCpu = FALSE;

-  

-  //

-  // Checks whether the current processor is an Intel product by CPUID.

-  //

-  AsmCpuid (0, &RegEax, &RegEbx, &RegEcx, &RegEdx);

-  if ((CompareMem ((CHAR8 *)(&RegEbx), "Genu", 4) == 0) &&

-      (CompareMem ((CHAR8 *)(&RegEdx), "ineI", 4) == 0) &&

-      (CompareMem ((CHAR8 *)(&RegEcx), "ntel", 4) == 0)) {

-    IsIntelCpu = TRUE;

-  }

-

-  if (IsIntelCpu) {

-    //

-    // Determine RDRAND support by examining bit 30 of the ECX register returned by CPUID.

-    // A value of 1 indicates that processor supports RDRAND instruction.

-    //

-    AsmCpuid (1, 0, 0, &RegEcx, 0);

-

-    if ((RegEcx & RDRAND_MASK) == RDRAND_MASK) {

-      Status = EFI_SUCCESS;

-    }

-  }

-

-  return Status;

-}

-

-/**

-  Calls RDRAND to obtain a 16-bit random number.

-

-  @param[out]  Rand          Buffer pointer to store the random result.

-  @param[in]   NeedRetry     Determine whether or not to loop retry.

-

-  @retval EFI_SUCCESS        RDRAND call was successful.

-  @retval EFI_NOT_READY      Failed attempts to call RDRAND.

-

-**/

-EFI_STATUS

-EFIAPI

-RdRand16 (

-  OUT UINT16       *Rand,

-  IN BOOLEAN       NeedRetry

-  )

-{

-  UINT32      Index;

-  UINT32      RetryCount;

-

-  if (NeedRetry) {

-    RetryCount = RETRY_LIMIT;

-  } else {

-    RetryCount = 1;

-  }

-

-  //

-  // Perform a single call to RDRAND, or enter a loop call until RDRAND succeeds.

-  //

-  for (Index = 0; Index < RetryCount; Index++) {

-    if (RdRand16Step (Rand)) {

-      return EFI_SUCCESS;

-    }

-  }

-  

-  return EFI_NOT_READY;

-}

-

-/**

-  Calls RDRAND to obtain a 32-bit random number.

-

-  @param[out]  Rand          Buffer pointer to store the random result.

-  @param[in]   NeedRetry     Determine whether or not to loop retry.

-

-  @retval EFI_SUCCESS        RDRAND call was successful.

-  @retval EFI_NOT_READY      Failed attempts to call RDRAND.

-

-**/

-EFI_STATUS

-EFIAPI

-RdRand32 (

-  OUT UINT32       *Rand,

-  IN BOOLEAN       NeedRetry

-  )

-{

-  UINT32      Index;

-  UINT32      RetryCount;

-

-  if (NeedRetry) {

-    RetryCount = RETRY_LIMIT;

-  } else {

-    RetryCount = 1;

-  }

-

-  //

-  // Perform a single call to RDRAND, or enter a loop call until RDRAND succeeds.

-  //

-  for (Index = 0; Index < RetryCount; Index++) {

-    if (RdRand32Step (Rand)) {

-      return EFI_SUCCESS;

-    }

-  }

-  

-  return EFI_NOT_READY;

-}

-

-/**

-  Calls RDRAND to obtain a 64-bit random number.

-

-  @param[out]  Rand          Buffer pointer to store the random result.

-  @param[in]   NeedRetry     Determine whether or not to loop retry.

-

-  @retval EFI_SUCCESS        RDRAND call was successful.

-  @retval EFI_NOT_READY      Failed attempts to call RDRAND.

-

-**/

-EFI_STATUS

-EFIAPI

-RdRand64 (

-  OUT UINT64       *Rand,

-  IN BOOLEAN       NeedRetry

-  )

-{

-  UINT32      Index;

-  UINT32      RetryCount;

-

-  if (NeedRetry) {

-    RetryCount = RETRY_LIMIT;

-  } else {

-    RetryCount = 1;

-  }

-

-  //

-  // Perform a single call to RDRAND, or enter a loop call until RDRAND succeeds.

-  //

-  for (Index = 0; Index < RetryCount; Index++) {

-    if (RdRand64Step (Rand)) {

-      return EFI_SUCCESS;

-    }

-  }

-  

-  return EFI_NOT_READY;

-}

-

 /**

   Calls RDRAND to fill a buffer of arbitrary size with random bytes.

 

@@ -199,80 +34,23 @@ RdRandGetBytes (
   OUT UINT8        *RandBuffer

   )

 {

-  EFI_STATUS  Status;

-  UINT8       *Start;

-  UINT8       *ResidualStart;

-  UINTN       *BlockStart;

-  UINTN       TempRand;

-  UINTN       Count;

-  UINTN       Residual;

-  UINTN       StartLen;

-  UINTN       BlockNum;

-  UINTN       Index;

-

-  ResidualStart = NULL;

-  TempRand      = 0;

+  BOOLEAN     IsRandom;

+  UINT64      TempRand[2];

 

-  //

-  // Compute the address of the first word aligned (32/64-bit) block in the 

-  // destination buffer, depending on whether we are in 32- or 64-bit mode.

-  //

-  Start = RandBuffer;

-  if (((UINT32)(UINTN)Start % (UINT32)sizeof(UINTN)) == 0) {

-    BlockStart = (UINTN *)Start;

-    Count      = Length;

-    StartLen   = 0;

-  } else {

-    BlockStart = (UINTN *)(((UINTN)Start & ~(UINTN)(sizeof(UINTN) - 1)) + (UINTN)sizeof(UINTN));

-    Count      = Length - (sizeof (UINTN) - (UINT32)((UINTN)Start % sizeof (UINTN)));

-    StartLen   = (UINT32)((UINTN)BlockStart - (UINTN)Start);

-  }

-

-  //

-  // Compute the number of word blocks and the remaining number of bytes.

-  //

-  Residual = Count % sizeof (UINTN);

-  BlockNum = Count / sizeof (UINTN);

-  if (Residual != 0) {

-    ResidualStart = (UINT8 *) (BlockStart + BlockNum);

-  }

-

-  //

-  // Obtain a temporary random number for use in the residuals. Failout if retry fails.

-  //

-  if (StartLen > 0) {

-    Status = RdRandWord ((UINTN *) &TempRand, TRUE);

-    if (EFI_ERROR (Status)) {

-      return Status;

-    }

-  }

-

-  //

-  // Populate the starting mis-aligned block.

-  //

-  for (Index = 0; Index < StartLen; Index++) {

-    Start[Index] = (UINT8)(TempRand & 0xff);

-    TempRand     = TempRand >> 8;

-  }

-

-  //

-  // Populate the central aligned block. Fail out if retry fails.

-  //

-  Status = RdRandGetWords (BlockNum, (UINTN *)(BlockStart));

-  if (EFI_ERROR (Status)) {

-    return Status;

-  }

-  //

-  // Populate the final mis-aligned block.

-  //

-  if (Residual > 0) {

-    Status = RdRandWord ((UINTN *)&TempRand, TRUE);

-    if (EFI_ERROR (Status)) {

-      return Status;

+  while (Length > 0) {

+    IsRandom = GetRandomNumber128 (TempRand);

+    if (!IsRandom) {

+      return EFI_NOT_READY;

     }

-    for (Index = 0; Index < Residual; Index++) {

-      ResidualStart[Index] = (UINT8)(TempRand & 0xff);

-      TempRand             = TempRand >> 8;

+    if (Length >= sizeof (TempRand)) {

+      WriteUnaligned64 ((UINT64*)RandBuffer, TempRand[0]);

+      RandBuffer += sizeof (UINT64);

+      WriteUnaligned64 ((UINT64*)RandBuffer, TempRand[1]);

+      RandBuffer += sizeof (UINT64);

+      Length -= sizeof (TempRand);

+    } else {

+      CopyMem (RandBuffer, TempRand, Length);

+      Length = 0;

     }

   }