From bc7751b74e4ef5eb713a2f47ad04c066c61efe9b Mon Sep 17 00:00:00 2001
From: tb <tb@openbsd.org>
Date: Sat, 4 Dec 2021 15:53:01 +0000
Subject: [PATCH] Provide replacement functions for the
 BN_{get,set,with}_flags() macros.

ok inoguchi jsing
---
 lib/libcrypto/bn/bn.h     | 10 +++++++++-
 lib/libcrypto/bn/bn_lib.c | 26 +++++++++++++++++++++++++-
 2 files changed, 34 insertions(+), 2 deletions(-)

diff --git a/lib/libcrypto/bn/bn.h b/lib/libcrypto/bn/bn.h
index cfdf46906bc..20212bf171c 100644
--- a/lib/libcrypto/bn/bn.h
+++ b/lib/libcrypto/bn/bn.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: bn.h,v 1.45 2021/12/04 15:48:23 tb Exp $ */
+/* $OpenBSD: bn.h,v 1.46 2021/12/04 15:53:01 tb Exp $ */
 /* Copyright (C) 1995-1997 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -228,8 +228,14 @@ extern "C" {
 #ifndef OPENSSL_NO_DEPRECATED
 #define BN_FLG_FREE		0x8000	/* used for debugging */
 #endif
+#if defined(LIBRESSL_OPAQUE_BN) || defined(LIBRESSL_CRYPTO_INTERNAL)
+void BN_set_flags(BIGNUM *b, int n);
+int BN_get_flags(const BIGNUM *b, int n);
+void BN_with_flags(BIGNUM *dest, const BIGNUM *src, int flags);
+#else
 #define BN_set_flags(b,n)	((b)->flags|=(n))
 #define BN_get_flags(b,n)	((b)->flags&(n))
+#endif
 
 /* Values for |top| in BN_rand() */
 #define BN_RAND_TOP_ANY    -1
@@ -240,6 +246,7 @@ extern "C" {
 #define BN_RAND_BOTTOM_ANY  0
 #define BN_RAND_BOTTOM_ODD  1
 
+#if !defined(LIBRESSL_OPAQUE_BN) && !defined(LIBRESSL_CRYPTO_INTERNAL)
 /* get a clone of a BIGNUM with changed flags, for *temporary* use only
  * (the two BIGNUMs cannot not be used in parallel!) */
 #define BN_with_flags(dest,b,n)  ((dest)->d=(b)->d, \
@@ -250,6 +257,7 @@ extern "C" {
                                                  |  ((b)->flags & ~BN_FLG_MALLOCED) \
                                                  |  BN_FLG_STATIC_DATA \
                                                  |  (n)))
+#endif
 
 struct bignum_st {
 	BN_ULONG *d;	/* Pointer to an array of 'BN_BITS2' bit chunks. */
diff --git a/lib/libcrypto/bn/bn_lib.c b/lib/libcrypto/bn/bn_lib.c
index 14817629aa1..e4085c9d671 100644
--- a/lib/libcrypto/bn/bn_lib.c
+++ b/lib/libcrypto/bn/bn_lib.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: bn_lib.c,v 1.49 2021/12/04 15:48:23 tb Exp $ */
+/* $OpenBSD: bn_lib.c,v 1.50 2021/12/04 15:53:01 tb Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -137,6 +137,30 @@ BN_get_params(int which)
 }
 #endif
 
+void
+BN_set_flags(BIGNUM *b, int n)
+{
+	b->flags |= n;
+}
+
+int
+BN_get_flags(const BIGNUM *b, int n)
+{
+	return b->flags & n;
+}
+
+void
+BN_with_flags(BIGNUM *dest, const BIGNUM *b, int flags)
+{
+	int dest_flags;
+
+	dest_flags = (dest->flags & BN_FLG_MALLOCED) |
+	    (b->flags & ~BN_FLG_MALLOCED) | BN_FLG_STATIC_DATA | flags;
+
+	*dest = *b;
+	dest->flags = dest_flags;
+}
+
 const BIGNUM *
 BN_value_one(void)
 {
-- 
2.20.1