[PATCH 5/6] SecuriryPkg/TPM2: Move CopyDigestListToBuffer() to Tpm2CommandLib

[Star Zeng <star.zeng@intel.com>]

From: Jiewen Yao <jiewen.yao@intel.com>

This patch just moves function CopyDigestListToBuffer() from
drivers to library with HashAlgorithmMask parameter added to
make the interface more applicable.

The related function IsHashAlgSupportedInHashAlgorithmMask()
is also moved from drivers to library as internal function.

Cc: Chao B Zhang <chao.b.zhang@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jiewen Yao <jiewen.yao@intel.com>
Signed-off-by: Star Zeng <star.zeng@intel.com>
---
 SecurityPkg/Include/Library/Tpm2CommandLib.h  | 17 ++++++
 SecurityPkg/Library/Tpm2CommandLib/Tpm2Help.c | 83 +++++++++++++++++++++++++++
 SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dxe.c             | 80 +-------------------------
 SecurityPkg/Tcg/Tcg2Pei/Tcg2Pei.c             | 83 +--------------------------
 4 files changed, 102 insertions(+), 161 deletions(-)

diff --git a/SecurityPkg/Include/Library/Tpm2CommandLib.h b/SecurityPkg/Include/Library/Tpm2CommandLib.h
index 563cfc26e367..825ffc37a466 100644
--- a/SecurityPkg/Include/Library/Tpm2CommandLib.h
+++ b/SecurityPkg/Include/Library/Tpm2CommandLib.h
@@ -989,6 +989,23 @@ GetHashSizeFromAlgo (
   );
 
 /**
+  Copy TPML_DIGEST_VALUES into a buffer
+
+  @param[in,out] Buffer             Buffer to hold TPML_DIGEST_VALUES.
+  @param[in]     DigestList         TPML_DIGEST_VALUES to be copied.
+  @param[in]     HashAlgorithmMask  HASH bits corresponding to the desired digests to copy.
+
+  @return The end of buffer to hold TPML_DIGEST_VALUES.
+**/
+VOID *
+EFIAPI
+CopyDigestListToBuffer(
+  IN OUT VOID                       *Buffer,
+  IN TPML_DIGEST_VALUES             *DigestList,
+  IN UINT32                         HashAlgorithmMask
+  );
+
+/**
   Get TPML_DIGEST_VALUES data size.
 
   @param[in]     DigestList    TPML_DIGEST_VALUES data.
diff --git a/SecurityPkg/Library/Tpm2CommandLib/Tpm2Help.c b/SecurityPkg/Library/Tpm2CommandLib/Tpm2Help.c
index 96753b79d5e5..43574a246829 100644
--- a/SecurityPkg/Library/Tpm2CommandLib/Tpm2Help.c
+++ b/SecurityPkg/Library/Tpm2CommandLib/Tpm2Help.c
@@ -166,6 +166,89 @@ CopyAuthSessionResponse (
 }
 
 /**
+  Return if hash alg is supported in HashAlgorithmMask.
+
+  @param HashAlg            Hash algorithm to be checked.
+  @param HashAlgorithmMask  Bitfield of allowed hash algorithms.
+
+  @retval TRUE  Hash algorithm is supported.
+  @retval FALSE Hash algorithm is not supported.
+**/
+BOOLEAN
+IsHashAlgSupportedInHashAlgorithmMask(
+  IN TPMI_ALG_HASH  HashAlg,
+  IN UINT32         HashAlgorithmMask
+  )
+{
+  switch (HashAlg) {
+  case TPM_ALG_SHA1:
+    if ((HashAlgorithmMask & HASH_ALG_SHA1) != 0) {
+      return TRUE;
+    }
+    break;
+  case TPM_ALG_SHA256:
+    if ((HashAlgorithmMask & HASH_ALG_SHA256) != 0) {
+      return TRUE;
+    }
+    break;
+  case TPM_ALG_SHA384:
+    if ((HashAlgorithmMask & HASH_ALG_SHA384) != 0) {
+      return TRUE;
+    }
+    break;
+  case TPM_ALG_SHA512:
+    if ((HashAlgorithmMask & HASH_ALG_SHA512) != 0) {
+      return TRUE;
+    }
+    break;
+  case TPM_ALG_SM3_256:
+    if ((HashAlgorithmMask & HASH_ALG_SM3_256) != 0) {
+      return TRUE;
+    }
+    break;
+  }
+
+  return FALSE;
+}
+
+/**
+  Copy TPML_DIGEST_VALUES into a buffer
+
+  @param[in,out] Buffer             Buffer to hold TPML_DIGEST_VALUES.
+  @param[in]     DigestList         TPML_DIGEST_VALUES to be copied.
+  @param[in]     HashAlgorithmMask  HASH bits corresponding to the desired digests to copy.
+
+  @return The end of buffer to hold TPML_DIGEST_VALUES.
+**/
+VOID *
+EFIAPI
+CopyDigestListToBuffer (
+  IN OUT VOID                       *Buffer,
+  IN TPML_DIGEST_VALUES             *DigestList,
+  IN UINT32                         HashAlgorithmMask
+  )
+{
+  UINTN  Index;
+  UINT16 DigestSize;
+
+  CopyMem (Buffer, &DigestList->count, sizeof(DigestList->count));
+  Buffer = (UINT8 *)Buffer + sizeof(DigestList->count);
+  for (Index = 0; Index < DigestList->count; Index++) {
+    if (!IsHashAlgSupportedInHashAlgorithmMask(DigestList->digests[Index].hashAlg, HashAlgorithmMask)) {
+      DEBUG ((EFI_D_ERROR, "WARNING: TPM2 Event log has HashAlg unsupported by PCR bank (0x%x)\n", DigestList->digests[Index].hashAlg));
+      continue;
+    }
+    CopyMem (Buffer, &DigestList->digests[Index].hashAlg, sizeof(DigestList->digests[Index].hashAlg));
+    Buffer = (UINT8 *)Buffer + sizeof(DigestList->digests[Index].hashAlg);
+    DigestSize = GetHashSizeFromAlgo (DigestList->digests[Index].hashAlg);
+    CopyMem (Buffer, &DigestList->digests[Index].digest, DigestSize);
+    Buffer = (UINT8 *)Buffer + DigestSize;
+  }
+
+  return Buffer;
+}
+
+/**
   Get TPML_DIGEST_VALUES data size.
 
   @param[in]     DigestList    TPML_DIGEST_VALUES data.
diff --git a/SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dxe.c b/SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dxe.c
index 4d582c03d4c1..f3cc47796448 100644
--- a/SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dxe.c
+++ b/SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dxe.c
@@ -898,84 +898,6 @@ GetDigestListBinSize (
 }
 
 /**
-  Return if hash alg is supported in TPM PCR bank.
-
-  @param HashAlg  Hash algorithm to be checked.
-
-  @retval TRUE  Hash algorithm is supported.
-  @retval FALSE Hash algorithm is not supported.
-**/
-BOOLEAN
-IsHashAlgSupportedInPcrBank (
-  IN TPMI_ALG_HASH  HashAlg
-  )
-{
-  switch (HashAlg) {
-  case TPM_ALG_SHA1:
-    if ((mTcgDxeData.BsCap.ActivePcrBanks & EFI_TCG2_BOOT_HASH_ALG_SHA1) != 0) {
-      return TRUE;
-    }
-    break;
-  case TPM_ALG_SHA256:
-    if ((mTcgDxeData.BsCap.ActivePcrBanks & EFI_TCG2_BOOT_HASH_ALG_SHA256) != 0) {
-      return TRUE;
-    }
-    break;
-  case TPM_ALG_SHA384:
-    if ((mTcgDxeData.BsCap.ActivePcrBanks & EFI_TCG2_BOOT_HASH_ALG_SHA384) != 0) {
-      return TRUE;
-    }
-    break;
-  case TPM_ALG_SHA512:
-    if ((mTcgDxeData.BsCap.ActivePcrBanks & EFI_TCG2_BOOT_HASH_ALG_SHA512) != 0) {
-      return TRUE;
-    }
-    break;
-  case TPM_ALG_SM3_256:
-    if ((mTcgDxeData.BsCap.ActivePcrBanks & EFI_TCG2_BOOT_HASH_ALG_SM3_256) != 0) {
-      return TRUE;
-    }
-    break;
-  }
-
-  return FALSE;
-}
-
-/**
-  Copy TPML_DIGEST_VALUES into a buffer
-
-  @param[in,out] Buffer        Buffer to hold TPML_DIGEST_VALUES.
-  @param[in]     DigestList    TPML_DIGEST_VALUES to be copied.
-
-  @return The end of buffer to hold TPML_DIGEST_VALUES.
-**/
-VOID *
-CopyDigestListToBuffer (
-  IN OUT VOID                       *Buffer,
-  IN TPML_DIGEST_VALUES             *DigestList
-  )
-{
-  UINTN  Index;
-  UINT16 DigestSize;
-
-  CopyMem (Buffer, &DigestList->count, sizeof(DigestList->count));
-  Buffer = (UINT8 *)Buffer + sizeof(DigestList->count);
-  for (Index = 0; Index < DigestList->count; Index++) {
-    if (!IsHashAlgSupportedInPcrBank (DigestList->digests[Index].hashAlg)) {
-      DEBUG ((EFI_D_ERROR, "WARNING: TPM2 Event log has HashAlg unsupported by PCR bank (0x%x)\n", DigestList->digests[Index].hashAlg));
-      continue;
-    }
-    CopyMem (Buffer, &DigestList->digests[Index].hashAlg, sizeof(DigestList->digests[Index].hashAlg));
-    Buffer = (UINT8 *)Buffer + sizeof(DigestList->digests[Index].hashAlg);
-    DigestSize = GetHashSizeFromAlgo (DigestList->digests[Index].hashAlg);
-    CopyMem (Buffer, &DigestList->digests[Index].digest, DigestSize);
-    Buffer = (UINT8 *)Buffer + DigestSize;
-  }
-
-  return Buffer;
-}
-
-/**
   Add a new entry to the Event Log.
 
   @param[in]     DigestList    A list of digest.
@@ -1034,7 +956,7 @@ TcgDxeLogHashEvent (
         TcgPcrEvent2.PCRIndex = NewEventHdr->PCRIndex;
         TcgPcrEvent2.EventType = NewEventHdr->EventType;
         DigestBuffer = (UINT8 *)&TcgPcrEvent2.Digest;
-        DigestBuffer = CopyDigestListToBuffer (DigestBuffer, DigestList);
+        DigestBuffer = CopyDigestListToBuffer (DigestBuffer, DigestList, mTcgDxeData.BsCap.ActivePcrBanks);
         CopyMem (DigestBuffer, &NewEventHdr->EventSize, sizeof(NewEventHdr->EventSize));
         DigestBuffer = DigestBuffer + sizeof(NewEventHdr->EventSize);
 
diff --git a/SecurityPkg/Tcg/Tcg2Pei/Tcg2Pei.c b/SecurityPkg/Tcg/Tcg2Pei/Tcg2Pei.c
index c67cdffe48a8..a72b8d9bda1f 100644
--- a/SecurityPkg/Tcg/Tcg2Pei/Tcg2Pei.c
+++ b/SecurityPkg/Tcg/Tcg2Pei/Tcg2Pei.c
@@ -190,87 +190,6 @@ EndofPeiSignalNotifyCallBack (
 }
 
 /**
-  Return if hash alg is supported in TPM PCR bank.
-
-  @param HashAlg  Hash algorithm to be checked.
-
-  @retval TRUE  Hash algorithm is supported.
-  @retval FALSE Hash algorithm is not supported.
-**/
-BOOLEAN
-IsHashAlgSupportedInPcrBank (
-  IN TPMI_ALG_HASH  HashAlg
-  )
-{
-  UINT32  ActivePcrBanks;
-
-  ActivePcrBanks = PcdGet32 (PcdTpm2HashMask);
-  switch (HashAlg) {
-  case TPM_ALG_SHA1:
-    if ((ActivePcrBanks & EFI_TCG2_BOOT_HASH_ALG_SHA1) != 0) {
-      return TRUE;
-    }
-    break;
-  case TPM_ALG_SHA256:
-    if ((ActivePcrBanks & EFI_TCG2_BOOT_HASH_ALG_SHA256) != 0) {
-      return TRUE;
-    }
-    break;
-  case TPM_ALG_SHA384:
-    if ((ActivePcrBanks & EFI_TCG2_BOOT_HASH_ALG_SHA384) != 0) {
-      return TRUE;
-    }
-    break;
-  case TPM_ALG_SHA512:
-    if ((ActivePcrBanks & EFI_TCG2_BOOT_HASH_ALG_SHA512) != 0) {
-      return TRUE;
-    }
-    break;
-  case TPM_ALG_SM3_256:
-    if ((ActivePcrBanks & EFI_TCG2_BOOT_HASH_ALG_SM3_256) != 0) {
-      return TRUE;
-    }
-    break;
-  }
-
-  return FALSE;
-}
-
-/**
-  Copy TPML_DIGEST_VALUES into a buffer
-
-  @param[in,out] Buffer        Buffer to hold TPML_DIGEST_VALUES.
-  @param[in]     DigestList    TPML_DIGEST_VALUES to be copied.
-
-  @return The end of buffer to hold TPML_DIGEST_VALUES.
-**/
-VOID *
-CopyDigestListToBuffer (
-  IN OUT VOID                       *Buffer,
-  IN TPML_DIGEST_VALUES             *DigestList
-  )
-{
-  UINTN  Index;
-  UINT16 DigestSize;
-
-  CopyMem (Buffer, &DigestList->count, sizeof(DigestList->count));
-  Buffer = (UINT8 *)Buffer + sizeof(DigestList->count);
-  for (Index = 0; Index < DigestList->count; Index++) {
-    if (!IsHashAlgSupportedInPcrBank (DigestList->digests[Index].hashAlg)) {
-      DEBUG ((EFI_D_ERROR, "WARNING: TPM2 Event log has HashAlg unsupported by PCR bank (0x%x)\n", DigestList->digests[Index].hashAlg));
-      continue;
-    }
-    CopyMem (Buffer, &DigestList->digests[Index].hashAlg, sizeof(DigestList->digests[Index].hashAlg));
-    Buffer = (UINT8 *)Buffer + sizeof(DigestList->digests[Index].hashAlg);
-    DigestSize = GetHashSizeFromAlgo (DigestList->digests[Index].hashAlg);
-    CopyMem (Buffer, &DigestList->digests[Index].digest, DigestSize);
-    Buffer = (UINT8 *)Buffer + DigestSize;
-  }
-
-  return Buffer;
-}
-
-/**
   Set Tpm2HashMask PCD value according to TPM2 PCR bank.
 **/
 VOID
@@ -390,7 +309,7 @@ LogHashEvent (
         TcgPcrEvent2->PCRIndex = NewEventHdr->PCRIndex;
         TcgPcrEvent2->EventType = NewEventHdr->EventType;
         DigestBuffer = (UINT8 *)&TcgPcrEvent2->Digest;
-        DigestBuffer = CopyDigestListToBuffer (DigestBuffer, DigestList);
+        DigestBuffer = CopyDigestListToBuffer (DigestBuffer, DigestList, PcdGet32 (PcdTpm2HashMask));
         CopyMem (DigestBuffer, &NewEventHdr->EventSize, sizeof(TcgPcrEvent2->EventSize));
         DigestBuffer = DigestBuffer + sizeof(TcgPcrEvent2->EventSize);
         CopyMem (DigestBuffer, NewEventData, NewEventHdr->EventSize);
-- 
2.7.0.windows.1