diff --git a/SecurityPkg/Include/Library/Tpm2CommandLib.h b/SecurityPkg/Include/Library/Tpm2CommandLib.h
index 9a1dd8d8ac..85a4c65e02 100644
--- a/SecurityPkg/Include/Library/Tpm2CommandLib.h
+++ b/SecurityPkg/Include/Library/Tpm2CommandLib.h
@@ -1006,6 +1006,22 @@ GetHashSizeFromAlgo (
   IN TPMI_ALG_HASH    HashAlgo
   );
 
+/**
+  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
+EFIAPI
+IsHashAlgSupportedInHashAlgorithmMask(
+  IN TPMI_ALG_HASH  HashAlg,
+  IN UINT32         HashAlgorithmMask
+  );
+
 /**
   Copy TPML_DIGEST_VALUES into a buffer
 
diff --git a/SecurityPkg/Library/Tpm2CommandLib/Tpm2Help.c b/SecurityPkg/Library/Tpm2CommandLib/Tpm2Help.c
index be95fd69b3..95d4f7c84c 100644
--- a/SecurityPkg/Library/Tpm2CommandLib/Tpm2Help.c
+++ b/SecurityPkg/Library/Tpm2CommandLib/Tpm2Help.c
@@ -175,6 +175,7 @@ CopyAuthSessionResponse (
   @retval FALSE Hash algorithm is not supported.
 **/
 BOOLEAN
+EFIAPI
 IsHashAlgSupportedInHashAlgorithmMask(
   IN TPMI_ALG_HASH  HashAlg,
   IN UINT32         HashAlgorithmMask