[PATCH v6 5/5] CryptoPkg: OpensslLib: Use RngLib to generate entropy in rand_pool

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

From: Matthew Carlson <macarl@microsoft.com>

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

Changes OpenSSL to no longer depend on TimerLib and instead use RngLib.
This allows platforms to decide for themsevles what sort of entropy source
they provide to OpenSSL and TlsLib.

Cc: Ard Biesheuvel <ard.biesheuvel@arm.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Xiaoyu Lu <xiaoyux.lu@intel.com>
Signed-off-by: Matthew Carlson <matthewfcarlson@gmail.com>
---
 CryptoPkg/Library/OpensslLib/rand_pool.c           | 203 ++------------------
 CryptoPkg/Library/OpensslLib/rand_pool_noise.c     |  29 ---
 CryptoPkg/Library/OpensslLib/rand_pool_noise_tsc.c |  43 -----
 CryptoPkg/CryptoPkg.dsc                            |   1 +
 CryptoPkg/Library/OpensslLib/OpensslLib.inf        |  15 +-
 CryptoPkg/Library/OpensslLib/OpensslLibCrypto.inf  |  15 +-
 CryptoPkg/Library/OpensslLib/rand_pool_noise.h     |  29 ---
 7 files changed, 22 insertions(+), 313 deletions(-)

diff --git a/CryptoPkg/Library/OpensslLib/rand_pool.c b/CryptoPkg/Library/OpensslLib/rand_pool.c
index 9e0179b03490..3da92699fef6 100644
--- a/CryptoPkg/Library/OpensslLib/rand_pool.c
+++ b/CryptoPkg/Library/OpensslLib/rand_pool.c
@@ -11,53 +11,18 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
 #include <openssl/aes.h>
 
 #include <Uefi.h>
-#include <Library/TimerLib.h>
-
-#include "rand_pool_noise.h"
-
-/**
-  Get some randomness from low-order bits of GetPerformanceCounter results.
-  And combine them to the 64-bit value
-
-  @param[out] Rand    Buffer pointer to store the 64-bit random value.
-
-  @retval TRUE        Random number generated successfully.
-  @retval FALSE       Failed to generate.
-**/
-STATIC
-BOOLEAN
-EFIAPI
-GetRandNoise64FromPerformanceCounter(
-  OUT UINT64      *Rand
-  )
-{
-  UINT32 Index;
-  UINT32 *RandPtr;
-
-  if (NULL == Rand) {
-    return FALSE;
-  }
-
-  RandPtr = (UINT32 *) Rand;
-
-  for (Index = 0; Index < 2; Index ++) {
-    *RandPtr = (UINT32) (GetPerformanceCounter () & 0xFF);
-    MicroSecondDelay (10);
-    RandPtr++;
-  }
-
-  return TRUE;
-}
+#include <Library/RngLib.h>
 
 /**
   Calls RandomNumber64 to fill
   a buffer of arbitrary size with random bytes.
+  This is a shim layer to RngLib.
 
   @param[in]   Length        Size of the buffer, in bytes,  to fill with.
   @param[out]  RandBuffer    Pointer to the buffer to store the random result.
 
-  @retval EFI_SUCCESS        Random bytes generation succeeded.
-  @retval EFI_NOT_READY      Failed to request random bytes.
+  @retval TRUE        Random bytes generation succeeded.
+  @retval FALSE       Failed to request random bytes.
 
 **/
 STATIC
@@ -73,17 +38,17 @@ RandGetBytes (
 
   Ret = FALSE;
 
+  if (RandBuffer == NULL) {
+    DEBUG((DEBUG_ERROR, "[OPENSSL_RAND_POOL] NULL RandBuffer. No random numbers are generated and your system is not secure\n"));
+    ASSERT(FALSE); // Since we can't generate random numbers, we should assert. Otherwise we will just blow up later.
+    return Ret;
+  }
+
+
   while (Length > 0) {
-    //
-    // Get random noise from platform.
-    // If it failed, fallback to PerformanceCounter
-    // If you really care about security, you must override
-    // GetRandomNoise64FromPlatform.
-    //
-    Ret = GetRandomNoise64 (&TempRand);
-    if (Ret == FALSE) {
-      Ret = GetRandNoise64FromPerformanceCounter (&TempRand);
-    }
+    // Use RngLib to get random number
+    Ret = GetRandomNumber64(&TempRand);
+
     if (!Ret) {
       return Ret;
     }
@@ -100,125 +65,6 @@ RandGetBytes (
   return Ret;
 }
 
-/**
-  Creates a 128bit random value that is fully forward and backward prediction resistant,
-  suitable for seeding a NIST SP800-90 Compliant.
-  This function takes multiple random numbers from PerformanceCounter to ensure reseeding
-  and performs AES-CBC-MAC over the data to compute the seed value.
-
-  @param[out]  SeedBuffer    Pointer to a 128bit buffer to store the random seed.
-
-  @retval TRUE        Random seed generation succeeded.
-  @retval FALSE      Failed to request random bytes.
-
-**/
-STATIC
-BOOLEAN
-EFIAPI
-RandGetSeed128 (
-  OUT UINT8        *SeedBuffer
-  )
-{
-  BOOLEAN     Ret;
-  UINT8       RandByte[16];
-  UINT8       Key[16];
-  UINT8       Ffv[16];
-  UINT8       Xored[16];
-  UINT32      Index;
-  UINT32      Index2;
-  AES_KEY     AESKey;
-
-  //
-  // Chose an arbitrary key and zero the feed_forward_value (FFV)
-  //
-  for (Index = 0; Index < 16; Index++) {
-    Key[Index] = (UINT8) Index;
-    Ffv[Index] = 0;
-  }
-
-  AES_set_encrypt_key (Key, 16 * 8, &AESKey);
-
-  //
-  // Perform CBC_MAC over 32 * 128 bit values, with 10us gaps between 128 bit value
-  // The 10us gaps will ensure multiple reseeds within the system time with a large
-  // design margin.
-  //
-  for (Index = 0; Index < 32; Index++) {
-    MicroSecondDelay (10);
-    Ret = RandGetBytes (16, RandByte);
-    if (!Ret) {
-      return Ret;
-    }
-
-    //
-    // Perform XOR operations on two 128-bit value.
-    //
-    for (Index2 = 0; Index2 < 16; Index2++) {
-      Xored[Index2] = RandByte[Index2] ^ Ffv[Index2];
-    }
-
-    AES_encrypt (Xored, Ffv, &AESKey);
-  }
-
-  for (Index = 0; Index < 16; Index++) {
-    SeedBuffer[Index] = Ffv[Index];
-  }
-
-  return Ret;
-}
-
-/**
-  Generate high-quality entropy source.
-
-  @param[in]   Length        Size of the buffer, in bytes, to fill with.
-  @param[out]  Entropy       Pointer to the buffer to store the entropy data.
-
-  @retval EFI_SUCCESS        Entropy generation succeeded.
-  @retval EFI_NOT_READY      Failed to request random data.
-
-**/
-STATIC
-BOOLEAN
-EFIAPI
-RandGenerateEntropy (
-  IN UINTN         Length,
-  OUT UINT8        *Entropy
-  )
-{
-  BOOLEAN     Ret;
-  UINTN       BlockCount;
-  UINT8       Seed[16];
-  UINT8       *Ptr;
-
-  BlockCount = Length / 16;
-  Ptr        = (UINT8 *) Entropy;
-
-  //
-  // Generate high-quality seed for DRBG Entropy
-  //
-  while (BlockCount > 0) {
-    Ret = RandGetSeed128 (Seed);
-    if (!Ret) {
-      return Ret;
-    }
-    CopyMem (Ptr, Seed, 16);
-
-    BlockCount--;
-    Ptr = Ptr + 16;
-  }
-
-  //
-  // Populate the remained data as request.
-  //
-  Ret = RandGetSeed128 (Seed);
-  if (!Ret) {
-    return Ret;
-  }
-  CopyMem (Ptr, Seed, (Length % 16));
-
-  return Ret;
-}
-
 /*
  * Add random bytes to the pool to acquire requested amount of entropy
  *
@@ -238,7 +84,7 @@ size_t rand_pool_acquire_entropy(RAND_POOL *pool)
     buffer = rand_pool_add_begin(pool, bytes_needed);
 
     if (buffer != NULL) {
-      Ret = RandGenerateEntropy(bytes_needed, buffer);
+      Ret = RandGetBytes(bytes_needed, buffer);
       if (FALSE == Ret) {
         rand_pool_add_end(pool, 0, 0);
       } else {
@@ -257,13 +103,8 @@ size_t rand_pool_acquire_entropy(RAND_POOL *pool)
  */
 int rand_pool_add_nonce_data(RAND_POOL *pool)
 {
-  struct {
-    UINT64  Rand;
-    UINT64  TimerValue;
-  } data = { 0 };
-
-  RandGetBytes(8, (UINT8 *)&(data.Rand));
-  data.TimerValue = GetPerformanceCounter();
+  UINT8 data[16];
+  RandGetBytes(sizeof(data), data);
 
   return rand_pool_add(pool, (unsigned char*)&data, sizeof(data), 0);
 }
@@ -275,13 +116,8 @@ int rand_pool_add_nonce_data(RAND_POOL *pool)
  */
 int rand_pool_add_additional_data(RAND_POOL *pool)
 {
-  struct {
-    UINT64  Rand;
-    UINT64  TimerValue;
-  } data = { 0 };
-
-  RandGetBytes(8, (UINT8 *)&(data.Rand));
-  data.TimerValue = GetPerformanceCounter();
+  UINT8 data[16];
+  RandGetBytes(sizeof(data), data);
 
   return rand_pool_add(pool, (unsigned char*)&data, sizeof(data), 0);
 }
@@ -313,4 +149,3 @@ void rand_pool_cleanup(void)
 void rand_pool_keep_random_devices_open(int keep)
 {
 }
-
diff --git a/CryptoPkg/Library/OpensslLib/rand_pool_noise.c b/CryptoPkg/Library/OpensslLib/rand_pool_noise.c
deleted file mode 100644
index 212834e27acc..000000000000
--- a/CryptoPkg/Library/OpensslLib/rand_pool_noise.c
+++ /dev/null
@@ -1,29 +0,0 @@
-/** @file
-  Provide rand noise source.
-
-Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
-SPDX-License-Identifier: BSD-2-Clause-Patent
-
-**/
-
-#include <Library/BaseLib.h>
-
-/**
-  Get 64-bit noise source
-
-  @param[out] Rand         Buffer pointer to store 64-bit noise source
-
-  @retval FALSE            Failed to generate
-**/
-BOOLEAN
-EFIAPI
-GetRandomNoise64 (
-  OUT UINT64         *Rand
-  )
-{
-  //
-  // Return FALSE will fallback to use PerformanceCounter to
-  // generate noise.
-  //
-  return FALSE;
-}
diff --git a/CryptoPkg/Library/OpensslLib/rand_pool_noise_tsc.c b/CryptoPkg/Library/OpensslLib/rand_pool_noise_tsc.c
deleted file mode 100644
index 4158106231fd..000000000000
--- a/CryptoPkg/Library/OpensslLib/rand_pool_noise_tsc.c
+++ /dev/null
@@ -1,43 +0,0 @@
-/** @file
-  Provide rand noise source.
-
-Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
-SPDX-License-Identifier: BSD-2-Clause-Patent
-
-**/
-
-#include <Library/BaseLib.h>
-#include <Library/DebugLib.h>
-#include <Library/TimerLib.h>
-
-/**
-  Get 64-bit noise source
-
-  @param[out] Rand         Buffer pointer to store 64-bit noise source
-
-  @retval TRUE             Get randomness successfully.
-  @retval FALSE            Failed to generate
-**/
-BOOLEAN
-EFIAPI
-GetRandomNoise64 (
-  OUT UINT64         *Rand
-  )
-{
-  UINT32 Index;
-  UINT32 *RandPtr;
-
-  if (NULL == Rand) {
-    return FALSE;
-  }
-
-  RandPtr = (UINT32 *)Rand;
-
-  for (Index = 0; Index < 2; Index ++) {
-    *RandPtr = (UINT32) ((AsmReadTsc ()) & 0xFF);
-    RandPtr++;
-    MicroSecondDelay (10);
-  }
-
-  return TRUE;
-}
diff --git a/CryptoPkg/CryptoPkg.dsc b/CryptoPkg/CryptoPkg.dsc
index 1af78468a19c..0490eeb7e22f 100644
--- a/CryptoPkg/CryptoPkg.dsc
+++ b/CryptoPkg/CryptoPkg.dsc
@@ -60,6 +60,7 @@
   BaseCryptLib|CryptoPkg/Library/BaseCryptLibNull/BaseCryptLibNull.inf
   TlsLib|CryptoPkg/Library/TlsLibNull/TlsLibNull.inf
   HashApiLib|CryptoPkg/Library/BaseHashApiLib/BaseHashApiLib.inf
+  RngLib|MdePkg/Library/BaseRngLibNull/BaseRngLibNull.inf
 
 [LibraryClasses.ARM, LibraryClasses.AARCH64]
   #
diff --git a/CryptoPkg/Library/OpensslLib/OpensslLib.inf b/CryptoPkg/Library/OpensslLib/OpensslLib.inf
index dbbe5386a10c..4baad565564c 100644
--- a/CryptoPkg/Library/OpensslLib/OpensslLib.inf
+++ b/CryptoPkg/Library/OpensslLib/OpensslLib.inf
@@ -571,22 +571,9 @@
   $(OPENSSL_PATH)/ssl/statem/statem_local.h
 # Autogenerated files list ends here
   buildinf.h
-  rand_pool_noise.h
   ossl_store.c
   rand_pool.c
 
-[Sources.Ia32]
-  rand_pool_noise_tsc.c
-
-[Sources.X64]
-  rand_pool_noise_tsc.c
-
-[Sources.ARM]
-  rand_pool_noise.c
-
-[Sources.AARCH64]
-  rand_pool_noise.c
-
 [Packages]
   MdePkg/MdePkg.dec
   CryptoPkg/CryptoPkg.dec
@@ -594,7 +581,7 @@
 [LibraryClasses]
   BaseLib
   DebugLib
-  TimerLib
+  RngLib
   PrintLib
 
 [LibraryClasses.ARM]
diff --git a/CryptoPkg/Library/OpensslLib/OpensslLibCrypto.inf b/CryptoPkg/Library/OpensslLib/OpensslLibCrypto.inf
index 616ccd9f62d1..3557711bd85a 100644
--- a/CryptoPkg/Library/OpensslLib/OpensslLibCrypto.inf
+++ b/CryptoPkg/Library/OpensslLib/OpensslLibCrypto.inf
@@ -520,22 +520,9 @@
   $(OPENSSL_PATH)/crypto/x509v3/v3_admis.h
 # Autogenerated files list ends here
   buildinf.h
-  rand_pool_noise.h
   ossl_store.c
   rand_pool.c
 
-[Sources.Ia32]
-  rand_pool_noise_tsc.c
-
-[Sources.X64]
-  rand_pool_noise_tsc.c
-
-[Sources.ARM]
-  rand_pool_noise.c
-
-[Sources.AARCH64]
-  rand_pool_noise.c
-
 [Packages]
   MdePkg/MdePkg.dec
   CryptoPkg/CryptoPkg.dec
@@ -543,7 +530,7 @@
 [LibraryClasses]
   BaseLib
   DebugLib
-  TimerLib
+  RngLib
   PrintLib
 
 [LibraryClasses.ARM]
diff --git a/CryptoPkg/Library/OpensslLib/rand_pool_noise.h b/CryptoPkg/Library/OpensslLib/rand_pool_noise.h
deleted file mode 100644
index 75acc686a9f1..000000000000
--- a/CryptoPkg/Library/OpensslLib/rand_pool_noise.h
+++ /dev/null
@@ -1,29 +0,0 @@
-/** @file
-  Provide rand noise source.
-
-Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
-SPDX-License-Identifier: BSD-2-Clause-Patent
-
-**/
-
-#ifndef __RAND_POOL_NOISE_H__
-#define __RAND_POOL_NOISE_H__
-
-#include <Uefi/UefiBaseType.h>
-
-/**
-   Get 64-bit noise source.
-
-   @param[out] Rand         Buffer pointer to store 64-bit noise source
-
-   @retval TRUE             Get randomness successfully.
-   @retval FALSE            Failed to generate
-**/
-BOOLEAN
-EFIAPI
-GetRandomNoise64 (
-  OUT UINT64         *Rand
-  );
-
-
-#endif // __RAND_POOL_NOISE_H__
-- 
2.27.0.windows.1