Implement the BN_is_negative macro as a function

ok inoguchi jsing

2 files changed, 13 insertions, 2 deletions

diff --git a/src/lib/libcrypto/bn/bn.h b/src/lib/libcrypto/bn/bn.h
index e9837cbbd6..4bfb81d32e 100644
--- a/src/lib/libcrypto/bn/bn.h
+++ b/src/lib/libcrypto/bn/bn.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: bn.h,v 1.47 2021/12/04 15:59:52 tb Exp $ */
+/* $OpenBSD: bn.h,v 1.48 2021/12/04 16:02:44 tb Exp $ */
 /* Copyright (C) 1995-1997 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -485,11 +485,16 @@ int	BN_sqr(BIGNUM *r, const BIGNUM *a, BN_CTX *ctx);
  * \param  n  0 if the BIGNUM b should be positive and a value != 0 otherwise
  */
 void    BN_set_negative(BIGNUM *b, int n);
+
+#if defined(LIBRESSL_OPAQUE_BN) || defined(LIBRESSL_CRYPTO_INTERNAL)
+int BN_is_negative(const BIGNUM *b);
+#else
 /** BN_is_negative returns 1 if the BIGNUM is negative
  * \param  a  pointer to the BIGNUM object
  * \return 1 if a < 0 and 0 otherwise
  */
 #define BN_is_negative(a) ((a)->neg != 0)
+#endif
 
 #ifndef LIBRESSL_INTERNAL
 int     BN_div(BIGNUM *dv, BIGNUM *rem, const BIGNUM *m, const BIGNUM *d,
diff --git a/src/lib/libcrypto/bn/bn_lib.c b/src/lib/libcrypto/bn/bn_lib.c
index 77ee3b1fdc..2544722ea9 100644
--- a/src/lib/libcrypto/bn/bn_lib.c
+++ b/src/lib/libcrypto/bn/bn_lib.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: bn_lib.c,v 1.51 2021/12/04 15:59:52 tb Exp $ */
+/* $OpenBSD: bn_lib.c,v 1.52 2021/12/04 16:02:44 tb Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -1099,6 +1099,12 @@ BN_is_odd(const BIGNUM *a)
         return a->top > 0 && (a->d[0] & 1);
 }
 
+int
+BN_is_negative(const BIGNUM *a)
+{
+        return a->neg != 0;
+}
+
 BN_GENCB *
 BN_GENCB_new(void)
 {