HashInstanceLibSha256.c

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#include <PiPei.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/Tpm2CommandLib.h>
#include <Library/DebugLib.h>
#include <Library/BaseCryptLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/HashLib.h>
 
VOID
Tpm2SetSha256ToDigestList (
  IN TPML_DIGEST_VALUES  *DigestList,
  IN UINT8               *Sha256Digest
  )
{
  DigestList->count              = 1;
  DigestList->digests[0].hashAlg = TPM_ALG_SHA256;
  CopyMem (
    DigestList->digests[0].digest.sha256,
    Sha256Digest,
    SHA256_DIGEST_SIZE
    );
}
 
EFI_STATUS
EFIAPI
Sha256HashInit (
  OUT HASH_HANDLE  *HashHandle
  )
{
  VOID   *Sha256Ctx;
  UINTN  CtxSize;
 
  CtxSize   = Sha256GetContextSize ();
  Sha256Ctx = AllocatePool (CtxSize);
  ASSERT (Sha256Ctx != NULL);
 
  Sha256Init (Sha256Ctx);
 
  *HashHandle = (HASH_HANDLE)Sha256Ctx;
 
  return EFI_SUCCESS;
}
 
EFI_STATUS
EFIAPI
Sha256HashUpdate (
  IN HASH_HANDLE  HashHandle,
  IN VOID         *DataToHash,
  IN UINTN        DataToHashLen
  )
{
  VOID  *Sha256Ctx;
 
  Sha256Ctx = (VOID *)HashHandle;
  Sha256Update (Sha256Ctx, DataToHash, DataToHashLen);
 
  return EFI_SUCCESS;
}
 
EFI_STATUS
EFIAPI
Sha256HashFinal (
  IN HASH_HANDLE          HashHandle,
  OUT TPML_DIGEST_VALUES  *DigestList
  )
{
  UINT8  Digest[SHA256_DIGEST_SIZE];
  VOID   *Sha256Ctx;
 
  Sha256Ctx = (VOID *)HashHandle;
  Sha256Final (Sha256Ctx, Digest);
 
  FreePool (Sha256Ctx);
 
  Tpm2SetSha256ToDigestList (DigestList, Digest);
 
  return EFI_SUCCESS;
}
 
HASH_INTERFACE  mSha256InternalHashInstance = {
  HASH_ALGORITHM_SHA256_GUID,
  Sha256HashInit,
  Sha256HashUpdate,
  Sha256HashFinal,
};
 
EFI_STATUS
EFIAPI
HashInstanceLibSha256Constructor (
  VOID
  )
{
  EFI_STATUS  Status;
 
  Status = RegisterHashInterfaceLib (&mSha256InternalHashInstance);
  if ((Status == EFI_SUCCESS) || (Status == EFI_UNSUPPORTED)) {
    //
    // Unsupported means platform policy does not need this instance enabled.
    //
    return EFI_SUCCESS;
  }
 
  return Status;
}