2 files changed, 13 insertions, 2 deletions

diff --git a/src/lib/libcrypto/bn/bn.h b/src/lib/libcrypto/bn/bn.h
index 4bfb81d32e..af4dd41bd5 100644
--- a/src/lib/libcrypto/bn/bn.h
+++ b/src/lib/libcrypto/bn/bn.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: bn.h,v 1.48 2021/12/04 16:02:44 tb Exp $ */
+/* $OpenBSD: bn.h,v 1.49 2021/12/04 16:05:46 tb Exp $ */
 /* Copyright (C) 1995-1997 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -609,8 +609,13 @@ BN_MONT_CTX *BN_MONT_CTX_new(void );
 void BN_MONT_CTX_init(BN_MONT_CTX *ctx);
 int BN_mod_mul_montgomery(BIGNUM *r, const BIGNUM *a, const BIGNUM *b,
     BN_MONT_CTX *mont, BN_CTX *ctx);
+#if defined(LIBRESSL_OPAQUE_BN) || defined(LIBRESSL_CRYPTO_INTERNAL)
+int BN_to_montgomery(BIGNUM *r, const BIGNUM *a, BN_MONT_CTX *mont,
+    BN_CTX *ctx);
+#else
 #define BN_to_montgomery(r,a,mont,ctx)  BN_mod_mul_montgomery(\
         (r),(a),&((mont)->RR),(mont),(ctx))
+#endif
 int BN_from_montgomery(BIGNUM *r, const BIGNUM *a,
     BN_MONT_CTX *mont, BN_CTX *ctx);
 void BN_MONT_CTX_free(BN_MONT_CTX *mont);
diff --git a/src/lib/libcrypto/bn/bn_mont.c b/src/lib/libcrypto/bn/bn_mont.c
index eeac046826..45e312a3a6 100644
--- a/src/lib/libcrypto/bn/bn_mont.c
+++ b/src/lib/libcrypto/bn/bn_mont.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: bn_mont.c,v 1.26 2017/01/21 11:00:46 beck Exp $ */
+/* $OpenBSD: bn_mont.c,v 1.27 2021/12/04 16:05:46 tb Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -175,6 +175,12 @@ err:
         return (ret);
 }
 
+int
+BN_to_montgomery(BIGNUM *r, const BIGNUM *a, BN_MONT_CTX *mont, BN_CTX *ctx)
+{
+        return BN_mod_mul_montgomery(r, a, &mont->RR, mont, ctx);
+}
+
 #ifdef MONT_WORD
 static int
 BN_from_montgomery_word(BIGNUM *ret, BIGNUM *r, BN_MONT_CTX *mont)