build: build macOS against BoringSSL

Make the BoringSSL based build for macOS complete enough.  We can now
build a shared library version of SwiftCrypto on macOS without
CryptoKit.

Author: compnerd

CMakeLists.txt

@@ -11,7 +11,7 @@
 cmake_minimum_required(VERSION 3.15.1)
 
 project(SwiftCrypto
-  LANGUAGES C Swift)
+  LANGUAGES ASM C Swift)
 
 list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules)
 
@@ -35,12 +35,5 @@ if(BUILD_SHARED_LIBS)
   set(CMAKE_POSITION_INDEPENDENT_CODE YES)
 endif()
 
-if(APPLE)
-  find_library(CRYPTO_KIT CryptoKit)
-  if(NOT CRYPTO_KIT)
-    message(FATAL_ERROR "CryptoKit not found")
-  endif()
-endif()
-
 add_subdirectory(Sources)
 add_subdirectory(cmake/modules)

Sources/CCryptoBoringSSL/CMakeLists.txt

@@ -310,6 +310,29 @@ add_library(CCryptoBoringSSL STATIC
   crypto/x509v3/v3_purp.c
   crypto/x509v3/v3_skey.c
   crypto/x509v3/v3_utl.c)
+if(APPLE)
+  if(CMAKE_SYSTEM_PROCESSOR MATCHES "x86_64|amd64")
+    target_sources(CCryptoBoringSSL PRIVATE
+      crypto/chacha/chacha-x86_64.mac.x86_64.S
+      crypto/cipher_extra/aes128gcmsiv-x86_64.mac.x86_64.S
+      crypto/cipher_extra/chacha20_poly1305_x86_64.mac.x86_64.S
+      crypto/fipsmodule/aesni-gcm-x86_64.mac.x86_64.S
+      crypto/fipsmodule/aesni-x86_64.mac.x86_64.S
+      crypto/fipsmodule/ghash-ssse3-x86_64.mac.x86_64.S
+      crypto/fipsmodule/ghash-x86_64.mac.x86_64.S
+      crypto/fipsmodule/md5-x86_64.mac.x86_64.S
+      crypto/fipsmodule/p256-x86_64-asm.mac.x86_64.S
+      crypto/fipsmodule/p256_beeu-x86_64-asm.mac.x86_64.S
+      crypto/fipsmodule/rdrand-x86_64.mac.x86_64.S
+      crypto/fipsmodule/rsaz-avx2.mac.x86_64.S
+      crypto/fipsmodule/sha1-x86_64.mac.x86_64.S
+      crypto/fipsmodule/sha256-x86_64.mac.x86_64.S
+      crypto/fipsmodule/sha512-x86_64.mac.x86_64.S
+      crypto/fipsmodule/vpaes-x86_64.mac.x86_64.S
+      crypto/fipsmodule/x86_64-mont.mac.x86_64.S
+      crypto/fipsmodule/x86_64-mont5.mac.x86_64.S)
+  endif()
+endif()
 
 target_include_directories(CCryptoBoringSSL PUBLIC
   include)

Sources/Crypto/CMakeLists.txt

@@ -70,18 +70,14 @@ add_library(Crypto
   Util/SecureBytes.swift
   Util/Zeroization.swift)
 
-target_link_libraries(Crypto PUBLIC
-  CCryptoBoringSSL
-  CCryptoBoringSSLShims)
-  
-if(APPLE AND CRYPTO_KIT)
-  target_link_libraries(Crypto PRIVATE
-    ${CRYPTO_KIT})
-endif()
-  
+target_compile_definitions(Crypto PRIVATE
+  CRYPTO_IN_SWIFTPM_FORCE_BUILD_API)
 target_include_directories(Crypto PRIVATE
   $<TARGET_PROPERTY:CCryptoBoringSSL,INCLUDE_DIRECTORIES>
   $<TARGET_PROPERTY:CCryptoBoringSSLShims,INCLUDE_DIRECTORIES>)
+target_link_libraries(Crypto PUBLIC
+  CCryptoBoringSSL
+  CCryptoBoringSSLShims)
 set_target_properties(Crypto PROPERTIES
   INTERFACE_INCLUDE_DIRECTORIES ${CMAKE_Swift_MODULE_DIRECTORY})