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