CryptoPkg/BaseHashApiLib: Implement Unified Hash Calculation API

https://bugzilla.tianocore.org/show_bug.cgi?id=2151

This commit introduces a Unified Hash API to calculate hash using a
hashing algorithm specified by the PCD, PcdHashApiLibPolicy. This library
interfaces with the various hashing API, such as, MD4, MD5, SHA1, SHA256,
SHA512 and SM3_256 implemented in BaseCryptLib. The user can calculate
the desired hash by setting PcdHashApiLibPolicy to appropriate value.

This feature is documented in the Bugzilla,
https://bugzilla.tianocore.org/show_bug.cgi?id=2151.

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Signed-off-by: Amol N Sukerkar <amol.n.sukerkar@intel.com>
Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com>

CryptoPkg/Library/BaseHashApiLib/BaseHashApiLib.inf

@@ -0,0 +1,44 @@
+## @file
+#  Provides Unified API for Hash Calculation
+#
+#  This library is BaseHashApiLib. It will redirect hash request to
+#  each individual hash API, such as SHA1, SHA256, SHA384, SM3 based
+#  on hashing algorithm specified by PcdHashApiLibPolicy.
+#
+# Copyright (c) 2020, Intel Corporation. All rights reserved.<BR>
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+  INF_VERSION                    = 0x00010005
+  BASE_NAME                      = BaseHashApiLib
+  MODULE_UNI_FILE                = BaseHashApiLib.uni
+  FILE_GUID                      = B1E566DD-DE7C-4F04-BDA0-B1295D3BE927
+  MODULE_TYPE                    = BASE
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = BaseHashApiLib
+
+#
+# The following information is for reference only and not required by the build tools.
+#
+#  VALID_ARCHITECTURES           = IA32 X64
+#
+
+[Sources]
+  BaseHashApiLib.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+  CryptoPkg/CryptoPkg.dec
+
+[LibraryClasses]
+  BaseLib
+  BaseMemoryLib
+  DebugLib
+  MemoryAllocationLib
+  BaseCryptLib
+  PcdLib
+
+[Pcd]
+  gEfiCryptoPkgTokenSpaceGuid.PcdHashApiLibPolicy    ## CONSUMES