Open source DxilHash (microsoft#6846)

This pull request introduces the open-source implementation of hashing
functionality for DXIL containers.

DxilHash.cpp: Implements DXBC/DXIL container hashing functions.

This is first part for microsoft#6808

Author: python3kgae

include/dxc/DxilHash/DxilHash.h

@@ -0,0 +1,35 @@
+///////////////////////////////////////////////////////////////////////////////
+//                                                                           //
+// DxilHash.h                                                                //
+// Copyright (C) Microsoft Corporation. All rights reserved.                 //
+// This file is distributed under the University of Illinois Open Source     //
+// License. See LICENSE.TXT for details.                                     //
+//                                                                           //
+//                                                                           //
+// DXBC/DXIL container hashing functions                                     //
+//                                                                           //
+///////////////////////////////////////////////////////////////////////////////
+
+#pragma once
+
+#define DXIL_CONTAINER_HASH_SIZE 16
+
+// Prototype for hash computing function
+// pOutHash must always return a DXIL_CONTAINER_HASH_SIZE byte hash result.
+typedef void HASH_FUNCTION_PROTO(const BYTE *pData, UINT32 byteCount,
+                                 BYTE *pOutHash);
+
+// **************************************************************************************
+// **** DO NOT USE THESE ROUTINES TO PROVIDE FUNCTIONALITY THAT NEEDS TO BE
+// SECURE!!! ***
+// **************************************************************************************
+// Derived from: RSA Data Security, Inc. M
+//                                       D
+//                                       5 Message-Digest Algorithm
+// Computes a 128-bit hash of pData (size byteCount), returning 16 BYTE output
+void ComputeHashRetail(const BYTE *pData, UINT32 byteCount, BYTE *pOutHash);
+void ComputeHashDebug(const BYTE *pData, UINT32 byteCount, BYTE *pOutHash);
+// **************************************************************************************
+// **** DO NOT USE THESE ROUTINES TO PROVIDE FUNCTIONALITY THAT NEEDS TO BE
+// SECURE!!! ***
+// **************************************************************************************

lib/CMakeLists.txt

@@ -25,6 +25,7 @@ add_subdirectory(DxcSupport) # HLSL Change
 add_subdirectory(HLSL) # HLSL Change
 add_subdirectory(DXIL) # HLSL Change
 add_subdirectory(DxilContainer) # HLSL Change
+add_subdirectory(DxilHash) # HLSL Change
 add_subdirectory(DxilPdbInfo) # HLSL Change
 add_subdirectory(DxilPIXPasses) # HLSL Change
 add_subdirectory(DxilDia) # HLSL Change

lib/DxilHash/CMakeLists.txt

@@ -0,0 +1,3 @@
+
+add_llvm_library(LLVMDxilHash
+  DxilHash.cpp)