thodg/libgit2/cmake/SelectHashes.cmake

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• Hash : 6a7d5d23
  Author :
  Date : 2021-12-13T11:54:49
  

  sha: support Win32 for SHA256 Adding SHA256 support prompted an overdue refactoring of some of the unnecessary complexity around the CNG/CryptoAPI abstraction.

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• cmake/SelectHashes.cmake

• # Select a hash backend
  
  include(SanitizeBool)
  
  # USE_SHA1=CollisionDetection(ON)/HTTPS/Generic/OFF
  sanitizebool(USE_SHA1)
  sanitizebool(USE_SHA256)
  
  # sha1
  
  if(USE_SHA1 STREQUAL ON)
  	SET(USE_SHA1 "CollisionDetection")
  elseif(USE_SHA1 STREQUAL "HTTPS")
  	if(USE_HTTPS STREQUAL "SecureTransport")
  		set(USE_SHA1 "CommonCrypto")
  	elseif(USE_HTTPS STREQUAL "WinHTTP")
  		set(USE_SHA1 "Win32")
  	elseif(USE_HTTPS)
  		set(USE_SHA1 ${USE_HTTPS})
  	else()
  		set(USE_SHA1 "CollisionDetection")
  	endif()
  endif()
  
  if(USE_SHA1 STREQUAL "CollisionDetection")
  	set(GIT_SHA1_COLLISIONDETECT 1)
  elseif(USE_SHA1 STREQUAL "OpenSSL")
  	set(GIT_SHA1_OPENSSL 1)
  elseif(USE_SHA1 STREQUAL "CommonCrypto")
  	set(GIT_SHA1_COMMON_CRYPTO 1)
  elseif(USE_SHA1 STREQUAL "mbedTLS")
  	set(GIT_SHA1_MBEDTLS 1)
  elseif(USE_SHA1 STREQUAL "Win32")
  	set(GIT_SHA1_WIN32 1)
  else()
  	message(FATAL_ERROR "Asked for unknown SHA1 backend: ${USE_SHA1}")
  endif()
  
  # sha256
  
  if(USE_SHA256 STREQUAL ON AND USE_HTTPS)
  	SET(USE_SHA256 "HTTPS")
  elseif(USE_SHA256 STREQUAL ON)
  	SET(USE_SHA256 "Builtin")
  endif()
  
  if(USE_SHA256 STREQUAL "HTTPS")
  	if(USE_HTTPS STREQUAL "SecureTransport")
  		set(USE_SHA256 "CommonCrypto")
  	elseif(USE_HTTPS STREQUAL "WinHTTP")
  		set(USE_SHA256 "Win32")
  	elseif(USE_HTTPS)
  		set(USE_SHA256 ${USE_HTTPS})
  	endif()
  endif()
  
  if(USE_SHA256 STREQUAL "Builtin")
  	set(GIT_SHA256_BUILTIN 1)
  elseif(USE_SHA256 STREQUAL "OpenSSL")
  	set(GIT_SHA256_OPENSSL 1)
  elseif(USE_SHA256 STREQUAL "CommonCrypto")
  	set(GIT_SHA256_COMMON_CRYPTO 1)
  elseif(USE_SHA256 STREQUAL "mbedTLS")
  	set(GIT_SHA256_MBEDTLS 1)
  elseif(USE_SHA256 STREQUAL "Win32")
  	set(GIT_SHA256_WIN32 1)
  else()
  	message(FATAL_ERROR "Asked for unknown SHA256 backend: ${USE_SHA256}")
  endif()
  
  # add library requirements
  if(USE_SHA1 STREQUAL "OpenSSL" OR USE_SHA256 STREQUAL "OpenSSL")
  	if(CMAKE_SYSTEM_NAME MATCHES "FreeBSD")
  		list(APPEND LIBGIT2_PC_LIBS "-lssl")
  	else()
  		list(APPEND LIBGIT2_PC_REQUIRES "openssl")
  	endif()
  endif()
  
  if(USE_SHA1 STREQUAL "mbedTLS" OR USE_SHA256 STREQUAL "mbedTLS")
  	list(APPEND LIBGIT2_SYSTEM_INCLUDES ${MBEDTLS_INCLUDE_DIR})
  	list(APPEND LIBGIT2_SYSTEM_LIBS ${MBEDTLS_LIBRARIES})
  	# mbedTLS has no pkgconfig file, hence we can't require it
  	# https://github.com/ARMmbed/mbedtls/issues/228
  	# For now, pass its link flags as our own
  	list(APPEND LIBGIT2_PC_LIBS ${MBEDTLS_LIBRARIES})
  endif()
  
  # notify feature enablement
  
  add_feature_info(SHA1 ON "using ${USE_SHA1}")
  add_feature_info(SHA256 ON "using ${USE_SHA256}")
  

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