Remove BN_DIV2W.

The BN_DIV2W define provides a code path for double word division via the C
compiler, which is only enabled on hppa. Simplify the code and mop this up.

ok tb@

3 files changed, 4 insertions, 28 deletions

diff --git a/src/lib/libcrypto/arch/hppa/Makefile.inc b/src/lib/libcrypto/arch/hppa/Makefile.inc
index 11bfa4a5d3..bb8f1498dd 100644
--- a/src/lib/libcrypto/arch/hppa/Makefile.inc
+++ b/src/lib/libcrypto/arch/hppa/Makefile.inc
@@ -1,4 +1,4 @@
-# $OpenBSD: Makefile.inc,v 1.26 2025/02/14 12:01:58 jsing Exp $
+# $OpenBSD: Makefile.inc,v 1.27 2025/09/07 06:28:03 jsing Exp $
 
 # hppa-specific libcrypto build rules
 
@@ -7,7 +7,7 @@ CFLAGS+= -DAES_ASM
 SSLASM+= aes aes-parisc aes-parisc
 # bn
 SSLASM+= bn parisc-mont parisc-mont
-CFLAGS+= -DOPENSSL_BN_ASM_MONT -DBN_DIV2W
+CFLAGS+= -DOPENSSL_BN_ASM_MONT
 # modes
 CFLAGS+= -DGHASH_ASM
 SSLASM+= modes ghash-parisc ghash-parisc
diff --git a/src/lib/libcrypto/bn/bn.h b/src/lib/libcrypto/bn/bn.h
index 7c3c0b142f..f222e9e178 100644
--- a/src/lib/libcrypto/bn/bn.h
+++ b/src/lib/libcrypto/bn/bn.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: bn.h,v 1.80 2025/03/09 15:22:40 tb Exp $ */
+/* $OpenBSD: bn.h,v 1.81 2025/09/07 06:28:03 jsing Exp $ */
 /* Copyright (C) 1995-1997 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -138,19 +138,6 @@
 extern "C" {
 #endif
 
-/* This next option uses the C libraries (2 word)/(1 word) function.
- * If it is not defined, I use my C version (which is slower).
- * The reason for this flag is that when the particular C compiler
- * library routine is used, and the library is linked with a different
- * compiler, the library is missing.  This mostly happens when the
- * library is built with gcc and then linked using normal cc.  This would
- * be a common occurrence because gcc normally produces code that is
- * 2 times faster than system compilers for the big number stuff.
- * For machines with only one compiler (or shared libraries), this should
- * be on.  Again this in only really a problem on machines
- * using "long long's", are 32bit, and are not using my assembler code. */
-/* #define BN_DIV2W */
-
 #ifdef _LP64
 #undef  BN_LLONG
 #define BN_ULONG        unsigned long
diff --git a/src/lib/libcrypto/bn/bn_div.c b/src/lib/libcrypto/bn/bn_div.c
index e8eef4ed92..0a914db752 100644
--- a/src/lib/libcrypto/bn/bn_div.c
+++ b/src/lib/libcrypto/bn/bn_div.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: bn_div.c,v 1.43 2025/08/30 07:54:27 jsing Exp $ */
+/* $OpenBSD: bn_div.c,v 1.44 2025/09/07 06:28:03 jsing Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -71,16 +71,6 @@
 BN_ULONG bn_div_3_words(const BN_ULONG *m, BN_ULONG d1, BN_ULONG d0);
 
 #ifndef HAVE_BN_DIV_WORDS
-#if defined(BN_LLONG) && defined(BN_DIV2W)
-
-BN_ULONG
-bn_div_words(BN_ULONG h, BN_ULONG l, BN_ULONG d)
-{
-        return ((BN_ULONG)(((((BN_ULLONG)h) << BN_BITS2)|l)/(BN_ULLONG)d));
-}
-
-#else
-
 /* Divide h,l by d and return the result. */
 /* I need to test this some more :-( */
 BN_ULONG
@@ -148,7 +138,6 @@ bn_div_words(BN_ULONG h, BN_ULONG l, BN_ULONG d)
         ret |= q;
         return (ret);
 }
-#endif /* !defined(BN_LLONG) && defined(BN_DIV2W) */
 #endif
 
 /*