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, 9 insertions, 3 deletions

diff --git a/src/lib/libcrypto/arch/powerpc/Makefile.inc b/src/lib/libcrypto/arch/powerpc/Makefile.inc
index c37d88d779..c62c90f753 100644
--- a/src/lib/libcrypto/arch/powerpc/Makefile.inc
+++ b/src/lib/libcrypto/arch/powerpc/Makefile.inc
@@ -1,14 +1,19 @@
-# $OpenBSD: Makefile.inc,v 1.15 2026/01/17 13:55:31 jsing Exp $
+# $OpenBSD: Makefile.inc,v 1.16 2026/01/17 16:18:32 jsing Exp $
 
 # powerpc-specific libcrypto build rules
 
+# aes
 # slower than C code
 #SSLASM+= aes aes-ppc aes-ppc
+
 # bn
+CFLAGS+= -DLIBRESSL_USE_BN_ASSEMBLY
 SSLASM+= bn ppc bn-ppc
 SSLASM+= bn ppc-mont ppc-mont
 CFLAGS+= -DOPENSSL_BN_ASM_MONT
+
 # sha
+CFLAGS+= -DLIBRESSL_USE_SHA_ASSEMBLY
 SSLASM+= sha sha1-ppc sha1-ppc
 SSLASM+= sha sha512-ppc sha256-ppc
 
diff --git a/src/lib/libcrypto/arch/powerpc/crypto_arch.h b/src/lib/libcrypto/arch/powerpc/crypto_arch.h
index d2730af0fb..63aa840ae8 100644
--- a/src/lib/libcrypto/arch/powerpc/crypto_arch.h
+++ b/src/lib/libcrypto/arch/powerpc/crypto_arch.h
@@ -1,4 +1,4 @@
-/*      $OpenBSD: crypto_arch.h,v 1.2 2025/02/14 12:01:58 jsing Exp $ */
+/*      $OpenBSD: crypto_arch.h,v 1.3 2026/01/17 16:18:32 jsing Exp $ */
 /*
  * Copyright (c) 2024 Joel Sing <jsing@openbsd.org>
  *
@@ -20,11 +20,12 @@
 
 #ifndef OPENSSL_NO_ASM
 
+#ifdef LIBRESSL_USE_SHA_ASSEMBLY
 #define HAVE_SHA1_BLOCK_DATA_ORDER
 #define HAVE_SHA1_BLOCK_GENERIC
-
 #define HAVE_SHA256_BLOCK_DATA_ORDER
 #define HAVE_SHA256_BLOCK_GENERIC
+#endif
 
 #endif