[edk2-devel] [PATCH v2 2/9] CryptoPkg: Add rand function for BaseCryptLibMbedTls

["Wenxing Hou" <wenxing.hou@intel.com>]

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4177

Add rand function for BaseCryptLibMbedTls.

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Yi Li <yi1.li@intel.com>
Signed-off-by: Wenxing Hou <wenxing.hou@intel.com>
---
 .../BaseCryptLibMbedTls/InternalCryptLib.h    |  16 +++
 .../BaseCryptLibMbedTls/Rand/CryptRand.c      | 105 ++++++++++++++++++
 .../BaseCryptLibMbedTls/Rand/CryptRandTsc.c   | 105 ++++++++++++++++++
 3 files changed, 226 insertions(+)
 create mode 100644 CryptoPkg/Library/BaseCryptLibMbedTls/Rand/CryptRand.c
 create mode 100644 CryptoPkg/Library/BaseCryptLibMbedTls/Rand/CryptRandTsc.c

diff --git a/CryptoPkg/Library/BaseCryptLibMbedTls/InternalCryptLib.h b/CryptoPkg/Library/BaseCryptLibMbedTls/InternalCryptLib.h
index 039aa32028..8c463457d5 100644
--- a/CryptoPkg/Library/BaseCryptLibMbedTls/InternalCryptLib.h
+++ b/CryptoPkg/Library/BaseCryptLibMbedTls/InternalCryptLib.h
@@ -22,4 +22,20 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
 //
 #include <mbedtls/mbedtls_config.h>
 
+/**
+  The MbedTLS function f_rng, which MbedtlsRand implements.
+
+  @param[in]   RngState Not used, just for compatibility with mbedlts.
+  @param[out]  Output  Pointer to buffer to receive random value.
+  @param[in]   Len    Size of random bytes to generate.
+
+  @retval 0      Pseudorandom byte stream generated successfully.
+  @retval Non-0  Pseudorandom number generator fails to generate due to lack of entropy.
+**/
+INTN
+MbedtlsRand (
+  VOID   *RngState,
+  UINT8  *Output,
+  UINTN  Len
+  );
 #endif
diff --git a/CryptoPkg/Library/BaseCryptLibMbedTls/Rand/CryptRand.c b/CryptoPkg/Library/BaseCryptLibMbedTls/Rand/CryptRand.c
new file mode 100644
index 0000000000..b1531ee5b8
--- /dev/null
+++ b/CryptoPkg/Library/BaseCryptLibMbedTls/Rand/CryptRand.c
@@ -0,0 +1,105 @@
+/** @file
+  Pseudorandom Number Generator Wrapper Implementation over MbedTLS.
+
+Copyright (c) 2024, Intel Corporation. All rights reserved.<BR>
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include "InternalCryptLib.h"
+#include <Library/RngLib.h>
+
+/**
+  Sets up the seed value for the pseudorandom number generator.
+
+  This function sets up the seed value for the pseudorandom number generator.
+  If Seed is not NULL, then the seed passed in is used.
+  If Seed is NULL, then default seed is used.
+
+  @param[in]  Seed      Pointer to seed value.
+                        If NULL, default seed is used.
+  @param[in]  SeedSize  Size of seed value.
+                        If Seed is NULL, this parameter is ignored.
+
+  @retval TRUE   Pseudorandom number generator has enough entropy for random generation.
+  @retval FALSE  Pseudorandom number generator does not have enough entropy for random generation.
+
+**/
+BOOLEAN
+EFIAPI
+RandomSeed (
+  IN  CONST  UINT8  *Seed  OPTIONAL,
+  IN  UINTN         SeedSize
+  )
+{
+  return TRUE;
+}
+
+/**
+  Generates a pseudorandom byte stream of the specified size.
+
+  If Output is NULL, then return FALSE.
+
+  @param[out]  Output  Pointer to buffer to receive random value.
+  @param[in]   Size    Size of random bytes to generate.
+
+  @retval TRUE   Pseudorandom byte stream generated successfully.
+  @retval FALSE  Pseudorandom number generator fails to generate due to lack of entropy.
+
+**/
+BOOLEAN
+EFIAPI
+RandomBytes (
+  OUT  UINT8  *Output,
+  IN   UINTN  Size
+  )
+{
+  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 Ret;
+}
+
+/**
+  The MbedTLS function f_rng, which MbedtlsRand implements.
+
+  @param[in]   RngState Not used, just for compatibility with mbedlts.
+  @param[out]  Output  Pointer to buffer to receive random value.
+  @param[in]   Len    Size of random bytes to generate.
+
+  @retval 0      Pseudorandom byte stream generated successfully.
+  @retval Non-0  Pseudorandom number generator fails to generate due to lack of entropy.
+**/
+INTN
+MbedtlsRand (
+  VOID   *RngState,
+  UINT8  *Output,
+  UINTN  Len
+  )
+{
+  BOOLEAN  Result;
+
+  Result = RandomBytes (Output, Len);
+
+  return Result ? 0 : -1;
+}
diff --git a/CryptoPkg/Library/BaseCryptLibMbedTls/Rand/CryptRandTsc.c b/CryptoPkg/Library/BaseCryptLibMbedTls/Rand/CryptRandTsc.c
new file mode 100644
index 0000000000..b1531ee5b8
--- /dev/null
+++ b/CryptoPkg/Library/BaseCryptLibMbedTls/Rand/CryptRandTsc.c
@@ -0,0 +1,105 @@
+/** @file
+  Pseudorandom Number Generator Wrapper Implementation over MbedTLS.
+
+Copyright (c) 2024, Intel Corporation. All rights reserved.<BR>
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include "InternalCryptLib.h"
+#include <Library/RngLib.h>
+
+/**
+  Sets up the seed value for the pseudorandom number generator.
+
+  This function sets up the seed value for the pseudorandom number generator.
+  If Seed is not NULL, then the seed passed in is used.
+  If Seed is NULL, then default seed is used.
+
+  @param[in]  Seed      Pointer to seed value.
+                        If NULL, default seed is used.
+  @param[in]  SeedSize  Size of seed value.
+                        If Seed is NULL, this parameter is ignored.
+
+  @retval TRUE   Pseudorandom number generator has enough entropy for random generation.
+  @retval FALSE  Pseudorandom number generator does not have enough entropy for random generation.
+
+**/
+BOOLEAN
+EFIAPI
+RandomSeed (
+  IN  CONST  UINT8  *Seed  OPTIONAL,
+  IN  UINTN         SeedSize
+  )
+{
+  return TRUE;
+}
+
+/**
+  Generates a pseudorandom byte stream of the specified size.
+
+  If Output is NULL, then return FALSE.
+
+  @param[out]  Output  Pointer to buffer to receive random value.
+  @param[in]   Size    Size of random bytes to generate.
+
+  @retval TRUE   Pseudorandom byte stream generated successfully.
+  @retval FALSE  Pseudorandom number generator fails to generate due to lack of entropy.
+
+**/
+BOOLEAN
+EFIAPI
+RandomBytes (
+  OUT  UINT8  *Output,
+  IN   UINTN  Size
+  )
+{
+  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 Ret;
+}
+
+/**
+  The MbedTLS function f_rng, which MbedtlsRand implements.
+
+  @param[in]   RngState Not used, just for compatibility with mbedlts.
+  @param[out]  Output  Pointer to buffer to receive random value.
+  @param[in]   Len    Size of random bytes to generate.
+
+  @retval 0      Pseudorandom byte stream generated successfully.
+  @retval Non-0  Pseudorandom number generator fails to generate due to lack of entropy.
+**/
+INTN
+MbedtlsRand (
+  VOID   *RngState,
+  UINT8  *Output,
+  UINTN  Len
+  )
+{
+  BOOLEAN  Result;
+
+  Result = RandomBytes (Output, Len);
+
+  return Result ? 0 : -1;
+}
-- 
2.26.2.windows.1



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