2 files changed, 22 insertions, 2 deletions

diff --git a/src/lib/libcrypto/bn/bn_local.h b/src/lib/libcrypto/bn/bn_local.h
index 4b42ae95ee..067ffab3d9 100644
--- a/src/lib/libcrypto/bn/bn_local.h
+++ b/src/lib/libcrypto/bn/bn_local.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: bn_local.h,v 1.49 2025/02/12 21:21:34 tb Exp $ */
+/* $OpenBSD: bn_local.h,v 1.50 2025/02/13 11:04:20 tb Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -271,6 +271,8 @@ int bn_rand_interval(BIGNUM *rnd, BN_ULONG lower_word, const BIGNUM *upper_exc);
 
 void    BN_init(BIGNUM *);
 
+BN_MONT_CTX *BN_MONT_CTX_create(const BIGNUM *bn, BN_CTX *ctx);
+
 BN_RECP_CTX *BN_RECP_CTX_create(const BIGNUM *N);
 void BN_RECP_CTX_free(BN_RECP_CTX *recp);
 int     BN_div_reciprocal(BIGNUM *dv, BIGNUM *rem, const BIGNUM *m,
diff --git a/src/lib/libcrypto/bn/bn_mont.c b/src/lib/libcrypto/bn/bn_mont.c
index c7e2eefb58..cfdc7e510f 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 1.63 2024/03/26 04:23:04 jsing Exp $ */
+/* $OpenBSD: bn_mont.c,v 1.64 2025/02/13 11:04:20 tb Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -154,6 +154,24 @@ BN_MONT_CTX_free(BN_MONT_CTX *mctx)
 LCRYPTO_ALIAS(BN_MONT_CTX_free);
 
 BN_MONT_CTX *
+BN_MONT_CTX_create(const BIGNUM *bn, BN_CTX *bn_ctx)
+{
+        BN_MONT_CTX *mctx;
+
+        if ((mctx = BN_MONT_CTX_new()) == NULL)
+                goto err;
+        if (!BN_MONT_CTX_set(mctx, bn, bn_ctx))
+                goto err;
+
+        return mctx;
+
+ err:
+        BN_MONT_CTX_free(mctx);
+
+        return NULL;
+}
+
+BN_MONT_CTX *
 BN_MONT_CTX_copy(BN_MONT_CTX *dst, BN_MONT_CTX *src)
 {
         if (dst == src)