[Core] - Support azure-core version without OpenSSL dependency

sdk/core/azure-core/CHANGELOG.md

@@ -10,6 +10,10 @@
 
 ### Other Changes
 
+- Added option `BUILD_CRYPTO` to support building azure-core without the Cryptographic namespace (no hashing). ON by default.
+- Updated `base64` implementation.
+- Updated `Uuid` implementation for Linux.
+
 ## 1.2.1 (2021-09-02)
 
 ### Bugs Fixed

sdk/core/azure-core/CMakeLists.txt

@@ -22,6 +22,10 @@ az_vcpkg_integrate()
 
 find_package(Threads REQUIRED)
 
+# Allow building azure-core without OpenSSL dependency and hence without Crypto-functions
+# This is a work-around for anyone consuming azure-core without a need for Crypto like the cognitive services.
+option(BUILD_CRYPTO "Build the cryto namespace. Build will depend on OpenSSL." ON)
+
 if(BUILD_TRANSPORT_CURL)
   # min version for `CURLSSLOPT_NO_REVOKE`
   # https://curl.haxx.se/libcurl/c/CURLOPT_SSL_OPTIONS.html
@@ -47,13 +51,25 @@ if(BUILD_TRANSPORT_WINHTTP)
   SET(WIN_TRANSPORT_ADAPTER_INC inc/azure/core/http/win_http_transport.hpp)
 endif()
 
+if(BUILD_CRYPTO)
+  add_compile_definitions(AZURE_BUILD_CRYPTO)
+  SET(AZURE_SDK_CRYPTO_INC
+    inc/azure/core/cryptography/hash.hpp
+    inc/azure/core/internal/cryptography/sha_hash.hpp
+  )
+  SET(AZURE_SDK_CRYPTO_SRC
+    src/cryptography/md5.cpp
+    src/cryptography/sha_hash.cpp
+  )
+endif()
+
 set(
   AZURE_CORE_HEADER
     ${CURL_TRANSPORT_ADAPTER_INC}
     ${WIN_TRANSPORT_ADAPTER_INC}
     inc/azure/core/credentials/credentials.hpp
     inc/azure/core/credentials/token_credential_options.hpp
-    inc/azure/core/cryptography/hash.hpp
+    ${AZURE_SDK_CRYPTO_INC}
     inc/azure/core/diagnostics/logger.hpp
     inc/azure/core/http/http_status_code.hpp
     inc/azure/core/http/http.hpp
@@ -62,7 +78,6 @@ set(
     inc/azure/core/http/transport.hpp
     inc/azure/core/internal/client_options.hpp
     inc/azure/core/internal/contract.hpp
-    inc/azure/core/internal/cryptography/sha_hash.hpp
     inc/azure/core/internal/diagnostics/log.hpp
     inc/azure/core/internal/http/pipeline.hpp
     inc/azure/core/internal/io/null_body_stream.hpp
@@ -96,8 +111,7 @@ set(
     ${CURL_TRANSPORT_ADAPTER_SRC}
     ${WIN_TRANSPORT_ADAPTER_SRC}
     src/azure_assert.cpp
-    src/cryptography/md5.cpp
-    src/cryptography/sha_hash.cpp
+    ${AZURE_SDK_CRYPTO_SRC}
     src/http/bearer_token_authentication_policy.cpp
     src/http/http.cpp
     src/http/log_policy.cpp
@@ -140,11 +154,13 @@ create_code_coverage(core azure-core azure-core-test)
 
 target_link_libraries(azure-core INTERFACE Threads::Threads)
 
-if(WIN32)
-    target_link_libraries(azure-core PRIVATE bcrypt crypt32)
-else()
-    find_package(OpenSSL REQUIRED)
-    target_link_libraries(azure-core PRIVATE OpenSSL::SSL)
+if(BUILD_CRYPTO)
+  if(WIN32)
+      target_link_libraries(azure-core PRIVATE bcrypt crypt32)
+  else()
+      find_package(OpenSSL REQUIRED)
+      target_link_libraries(azure-core PRIVATE OpenSSL::SSL)
+  endif()
 endif()
 
 if(BUILD_TRANSPORT_CURL)