HashInstanceLibSha1.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
Tpm2SetSha1ToDigestList (
  IN TPML_DIGEST_VALUES  *DigestList,
  IN UINT8               *Sha1Digest
  )
{
  DigestList->count              = 1;
  DigestList->digests[0].hashAlg = TPM_ALG_SHA1;
  CopyMem (
    DigestList->digests[0].digest.sha1,
    Sha1Digest,
    SHA1_DIGEST_SIZE
    );
}
 
EFI_STATUS
EFIAPI
Sha1HashInit (
  OUT HASH_HANDLE  *HashHandle
  )
{
  VOID   *Sha1Ctx;
  UINTN  CtxSize;
 
  CtxSize = Sha1GetContextSize ();
  Sha1Ctx = AllocatePool (CtxSize);
  ASSERT (Sha1Ctx != NULL);
 
  Sha1Init (Sha1Ctx);
 
  *HashHandle = (HASH_HANDLE)Sha1Ctx;
 
  return EFI_SUCCESS;
}
 
EFI_STATUS
EFIAPI
Sha1HashUpdate (
  IN HASH_HANDLE  HashHandle,
  IN VOID         *DataToHash,
  IN UINTN        DataToHashLen
  )
{
  VOID  *Sha1Ctx;
 
  Sha1Ctx = (VOID *)HashHandle;
  Sha1Update (Sha1Ctx, DataToHash, DataToHashLen);
 
  return EFI_SUCCESS;
}
 
EFI_STATUS
EFIAPI
Sha1HashFinal (
  IN HASH_HANDLE          HashHandle,
  OUT TPML_DIGEST_VALUES  *DigestList
  )
{
  UINT8  Digest[SHA1_DIGEST_SIZE];
  VOID   *Sha1Ctx;
 
  Sha1Ctx = (VOID *)HashHandle;
  Sha1Final (Sha1Ctx, Digest);
 
  FreePool (Sha1Ctx);
 
  Tpm2SetSha1ToDigestList (DigestList, Digest);
 
  return EFI_SUCCESS;
}
 
HASH_INTERFACE  mSha1InternalHashInstance = {
  HASH_ALGORITHM_SHA1_GUID,
  Sha1HashInit,
  Sha1HashUpdate,
  Sha1HashFinal,
};
 
EFI_STATUS
EFIAPI
HashInstanceLibSha1Constructor (
  VOID
  )
{
  EFI_STATUS  Status;
 
  Status = RegisterHashInterfaceLib (&mSha1InternalHashInstance);
  if ((Status == EFI_SUCCESS) || (Status == EFI_UNSUPPORTED)) {
    //
    // Unsupported means platform policy does not need this instance enabled.
    //
    return EFI_SUCCESS;
  }
 
  return Status;
}