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.

5 files changed, 11 insertions, 9 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
 
diff --git a/src/lib/libcrypto/arch/i386/Makefile.inc b/src/lib/libcrypto/arch/i386/Makefile.inc
index 18d316e64d..26c3bc4568 100644
--- a/src/lib/libcrypto/arch/i386/Makefile.inc
+++ b/src/lib/libcrypto/arch/i386/Makefile.inc
@@ -1,4 +1,4 @@
-# $OpenBSD: Makefile.inc,v 1.33 2026/01/17 14:30:37 jsing Exp $
+# $OpenBSD: Makefile.inc,v 1.34 2026/01/17 14:53:09 jsing Exp $
 
 # i386-specific libcrypto build rules
 
@@ -19,7 +19,6 @@ CFLAGS+= -DOPENSSL_BN_ASM_MONT
 SSLASM+= bn x86-mont
 
 # md5
-CFLAGS+= -DMD5_ASM
 SSLASM+= md5 md5-586
 
 # modes
diff --git a/src/lib/libcrypto/arch/i386/crypto_arch.h b/src/lib/libcrypto/arch/i386/crypto_arch.h
index 143dce6ce0..ff14881f36 100644
--- a/src/lib/libcrypto/arch/i386/crypto_arch.h
+++ b/src/lib/libcrypto/arch/i386/crypto_arch.h
@@ -1,4 +1,4 @@
-/*      $OpenBSD: crypto_arch.h,v 1.15 2026/01/17 14:30:37 jsing Exp $ */
+/*      $OpenBSD: crypto_arch.h,v 1.16 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_i386;
 #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
 
diff --git a/src/lib/libcrypto/md5/md5.c b/src/lib/libcrypto/md5/md5.c
index f1c9223d86..f5ad5570a4 100644
--- a/src/lib/libcrypto/md5/md5.c
+++ b/src/lib/libcrypto/md5/md5.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: md5.c,v 1.25 2025/01/24 13:35:04 jsing Exp $ */
+/* $OpenBSD: md5.c,v 1.26 2026/01/17 14:53:09 jsing Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -70,11 +70,11 @@
 /* Ensure that MD5_LONG and uint32_t are equivalent size. */
 CTASSERT(sizeof(MD5_LONG) == sizeof(uint32_t));
 
-#ifdef MD5_ASM
+#ifdef HAVE_MD5_BLOCK_DATA_ORDER
 void md5_block_data_order(MD5_CTX *c, const void *p, size_t num);
 #endif
 
-#ifndef MD5_ASM
+#ifndef HAVE_MD5_BLOCK_DATA_ORDER
 static inline uint32_t
 md5_F(uint32_t x, uint32_t y, uint32_t z)
 {