Index: lld/MachO/SyntheticSections.cpp
===================================================================
--- lld/MachO/SyntheticSections.cpp
+++ lld/MachO/SyntheticSections.cpp
@@ -23,10 +23,14 @@
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/LEB128.h"
 #include "llvm/Support/Path.h"
-#include "llvm/Support/SHA256.h"
 
 #if defined(__APPLE__)
 #include <sys/mman.h>
+
+#define COMMON_DIGEST_FOR_OPENSSL
+#include <CommonCrypto/CommonDigest.h>
+#else
+#include "llvm/Support/SHA256.h"
 #endif
 
 #ifdef LLVM_HAVE_LIBXAR
@@ -45,10 +49,16 @@
 
 // Reads `len` bytes at data and writes the 32-byte SHA256 checksum to `output`.
 static void sha256(const uint8_t *data, size_t len, uint8_t *output) {
+#if defined(__APPLE__)
+  // FIXME: Make LLVM's SHA256 faster and use it unconditionally. See PR56121
+  // for some notes on this.
+  CC_SHA256(data, len, output);
+#else
   ArrayRef<uint8_t> block(data, len);
   std::array<uint8_t, 32> hash = SHA256::hash(block);
   assert(hash.size() == CodeSignatureSection::hashSize);
   memcpy(output, hash.data(), hash.size());
+#endif
 }
 
 InStruct macho::in;