1 files changed, 10 insertions, 1 deletions
diff --git a/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigImpl.c b/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigImpl.c
index 517d9d9..5b8ae7e 100644
--- a/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigImpl.c
+++ b/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigImpl.c
@@ -1073,6 +1073,8 @@ CalculateCertHash (
   BOOLEAN                   Status;
   VOID                      *HashCtx;
   UINTN                     CtxSize;
+  UINT8                     *TBSCert;
+  UINTN                     TBSCertSize;
 
   HashCtx = NULL;
   Status  = FALSE;
@@ -1082,6 +1084,13 @@ CalculateCertHash (
   }
 
   //
+  // Retrieve the TBSCertificate for Hash Calculation.
+  //
+  if (!X509GetTBSCert (CertData, CertSize, &TBSCert, &TBSCertSize)) {
+    return FALSE;
+  }
+
+  //
   // 1. Initialize context of hash.
   //
   CtxSize = mHash[HashAlg].GetContextSize ();
@@ -1099,7 +1108,7 @@ CalculateCertHash (
   //
   // 3. Calculate the hash.
   //
-  Status  = mHash[HashAlg].HashUpdate (HashCtx, CertData, CertSize);
+  Status  = mHash[HashAlg].HashUpdate (HashCtx, TBSCert, TBSCertSize);
   if (!Status) {
     goto Done;
   }