Replace MD5_ASM with function specific defines.

Use the same pattern that is now used for most other code - provide
HAVE_MD5_BLOCK_DATA_ORDER and use this to selectively enable source code.

2 files changed, 4 insertions, 3 deletions

diff --git a/src/lib/libcrypto/arch/amd64/Makefile.inc b/src/lib/libcrypto/arch/amd64/Makefile.inc
index 49f2f6e627..8f1681322d 100644
--- a/src/lib/libcrypto/arch/amd64/Makefile.inc
+++ b/src/lib/libcrypto/arch/amd64/Makefile.inc
@@ -1,4 +1,4 @@
-# $OpenBSD: Makefile.inc,v 1.44 2026/01/17 14:30:37 jsing Exp $
+# $OpenBSD: Makefile.inc,v 1.45 2026/01/17 14:53:09 jsing Exp $
 
 # amd64-specific libcrypto build rules
 
@@ -44,7 +44,6 @@ SRCS += bignum_sub.S
 SRCS += word_clz.S
 
 # md5
-CFLAGS+= -DMD5_ASM
 SRCS+= md5_amd64_generic.S
 
 # modes
diff --git a/src/lib/libcrypto/arch/amd64/crypto_arch.h b/src/lib/libcrypto/arch/amd64/crypto_arch.h
index fdc17b8110..411deb0e5d 100644
--- a/src/lib/libcrypto/arch/amd64/crypto_arch.h
+++ b/src/lib/libcrypto/arch/amd64/crypto_arch.h
@@ -1,4 +1,4 @@
-/*      $OpenBSD: crypto_arch.h,v 1.16 2026/01/17 14:30:37 jsing Exp $ */
+/*      $OpenBSD: crypto_arch.h,v 1.17 2026/01/17 14:53:09 jsing Exp $ */
 /*
  * Copyright (c) 2024 Joel Sing <jsing@openbsd.org>
  *
@@ -52,6 +52,8 @@ extern uint64_t crypto_cpu_caps_amd64;
 #define HAVE_GCM_GHASH_4BIT
 #define HAVE_GCM_GMULT_4BIT
 
+#define HAVE_MD5_BLOCK_DATA_ORDER
+
 #define HAVE_RC4_INTERNAL
 #define HAVE_RC4_SET_KEY_INTERNAL