SecurityPkg DxeImageVerificationLib: Add comments in HashPeImage()

The input PeImage in HashPeImage() has been checked.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Reviewed-by: Chao Zhang <chao.b.zhang@intel.com>
diff --git a/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c b/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
index 3aef1af..7b7e6af 100644
--- a/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
+++ b/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
@@ -275,11 +275,14 @@
 /**

   Calculate hash of Pe/Coff image based on the authenticode image hashing in

   PE/COFF Specification 8.0 Appendix A

-

+  

   Caution: This function may receive untrusted input.

   PE/COFF image is external input, so this function will validate its data structure

   within this image buffer before use.

 

+  Notes: PE/COFF image has been checked by BasePeCoffLib PeCoffLoaderGetImageInfo() in 

+  its caller function DxeImageVerificationHandler().

+

   @param[in]    HashAlg   Hash algorithm type.

 

   @retval TRUE            Successfully hash image.