CryptoPkg/Library: Add BaseCryptLibOnProtocolPpi instances

[mirror_edk2.git] / CryptoPkg / Library / BaseCryptLibOnProtocolPpi / PeiCryptLib.c

/** @file\r
  Implements the GetCryptoServices() API that retuns a pointer to the EDK II\r
  Crypto PPI.\r
\r
  Copyright (C) Microsoft Corporation. All rights reserved.\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
#include <PiPei.h>\r
#include <Library/BaseLib.h>\r
#include <Library/DebugLib.h>\r
#include <Library/PeiServicesLib.h>\r
#include <Ppi/Crypto.h>\r
\r
/**\r
  Internal worker function that returns the pointer to an EDK II Crypto\r
  Protocol/PPI.  The layout of the PPI, DXE Protocol, and SMM Protocol are\r
  identical which allows the implementation of the BaseCryptLib functions that\r
  call through a Protocol/PPI to be shared for the PEI, DXE, and SMM\r
  implementations.\r
\r
  This PEI implementation looks up the EDK II Crypto PPI and verifies the\r
  version each time a crypto service is called, so it is compatible with XIP\r
  PEIMs.\r
**/\r
VOID *\r
GetCryptoServices (\r
  VOID\r
  )\r
{\r
  EFI_STATUS        Status;\r
  EDKII_CRYPTO_PPI  *CryptoPpi;\r
  UINTN             Version;\r
\r
  CryptoPpi = NULL;\r
  Status = PeiServicesLocatePpi (\r
             &gEdkiiCryptoPpiGuid,\r
             0,\r
             NULL,\r
             (VOID **)&CryptoPpi\r
             );\r
  if (EFI_ERROR (Status) || CryptoPpi == NULL) {\r
    DEBUG((DEBUG_ERROR, "[PeiCryptLib] Failed to locate Crypto PPI. Status = %r\n", Status));\r
    ASSERT_EFI_ERROR (Status);\r
    ASSERT (CryptoPpi != NULL);\r
    return NULL;\r
  }\r
\r
  Version = CryptoPpi->GetVersion ();\r
  if (Version < EDKII_CRYPTO_VERSION) {\r
    DEBUG((DEBUG_ERROR, "[PeiCryptLib] Crypto PPI unsupported version %d\n", Version));\r
    ASSERT (Version >= EDKII_CRYPTO_VERSION);\r
    return NULL;\r
  }\r
\r
  return (VOID *)CryptoPpi;\r
}\r