Provide LIBRESSL_USE_.*_ASSEMBLY defines.

Make life easier for portable by providing LIBRESSL_USE_.*_ASSEMBLY
defines, which enable/disable assembly for a specific algorithm. This
means that selected platforms can include the assembly files and specify
a define, rather than having to try to patch the crypto_arch.h headers.

Discussed with tb@

2 files changed, 5 insertions, 2 deletions

diff --git a/src/lib/libcrypto/arch/aarch64/Makefile.inc b/src/lib/libcrypto/arch/aarch64/Makefile.inc
index d1f22d87cd..596e98fe69 100644
--- a/src/lib/libcrypto/arch/aarch64/Makefile.inc
+++ b/src/lib/libcrypto/arch/aarch64/Makefile.inc
@@ -1,9 +1,10 @@
-# $OpenBSD: Makefile.inc,v 1.17 2025/06/28 12:51:08 jsing Exp $
+# $OpenBSD: Makefile.inc,v 1.18 2026/01/17 16:18:31 jsing Exp $
 
 # aarch64-specific libcrypto build rules
 
 SRCS += crypto_cpu_caps.c
 
+CFLAGS+= -DLIBRESSL_USE_SHA_ASSEMBLY
 SRCS += sha1_aarch64.c
 SRCS += sha1_aarch64_ce.S
 SRCS += sha256_aarch64.c
diff --git a/src/lib/libcrypto/arch/aarch64/crypto_arch.h b/src/lib/libcrypto/arch/aarch64/crypto_arch.h
index 51c8d79e2d..8b5d83311e 100644
--- a/src/lib/libcrypto/arch/aarch64/crypto_arch.h
+++ b/src/lib/libcrypto/arch/aarch64/crypto_arch.h
@@ -1,4 +1,4 @@
-/*      $OpenBSD: crypto_arch.h,v 1.5 2025/06/28 12:51:08 jsing Exp $ */
+/*      $OpenBSD: crypto_arch.h,v 1.6 2026/01/17 16:18:31 jsing Exp $ */
 /*
  * Copyright (c) 2024 Joel Sing <jsing@openbsd.org>
  *
@@ -35,9 +35,11 @@ extern uint64_t crypto_cpu_caps_aarch64;
 
 #ifndef OPENSSL_NO_ASM
 
+#ifdef LIBRESSL_USE_SHA_ASSEMBLY
 #define HAVE_SHA1_BLOCK_DATA_ORDER
 #define HAVE_SHA256_BLOCK_DATA_ORDER
 #define HAVE_SHA512_BLOCK_DATA_ORDER
+#endif
 
 #endif