Provide EC_GROUP_get0_cofactor() for internal use

While this is public API in OpenSSL, there are no plans to expose it.

ok jsing

2 files changed, 9 insertions, 2 deletions

diff --git a/src/lib/libcrypto/ec/ec_lib.c b/src/lib/libcrypto/ec/ec_lib.c
index 85567a76c1..4b7eb6016c 100644
--- a/src/lib/libcrypto/ec/ec_lib.c
+++ b/src/lib/libcrypto/ec/ec_lib.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: ec_lib.c,v 1.67 2024/04/23 10:52:08 tb Exp $ */
+/* $OpenBSD: ec_lib.c,v 1.68 2024/10/15 06:27:43 tb Exp $ */
 /*
  * Originally written by Bodo Moeller for the OpenSSL project.
  */
@@ -393,6 +393,12 @@ EC_GROUP_get_cofactor(const EC_GROUP *group, BIGNUM *cofactor, BN_CTX *ctx)
 }
 LCRYPTO_ALIAS(EC_GROUP_get_cofactor);
 
+const BIGNUM *
+EC_GROUP_get0_cofactor(const EC_GROUP *group)
+{
+        return &group->cofactor;
+}
+
 void
 EC_GROUP_set_curve_name(EC_GROUP *group, int nid)
 {
diff --git a/src/lib/libcrypto/ec/ec_local.h b/src/lib/libcrypto/ec/ec_local.h
index c2befdede7..ca55770ba8 100644
--- a/src/lib/libcrypto/ec/ec_local.h
+++ b/src/lib/libcrypto/ec/ec_local.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: ec_local.h,v 1.28 2024/10/03 06:24:07 tb Exp $ */
+/* $OpenBSD: ec_local.h,v 1.29 2024/10/15 06:27:43 tb Exp $ */
 /*
  * Originally written by Bodo Moeller for the OpenSSL project.
  */
@@ -356,6 +356,7 @@ int EC_POINT_get_Jprojective_coordinates(const EC_GROUP *group,
     const EC_POINT *p, BIGNUM *x, BIGNUM *y, BIGNUM *z, BN_CTX *ctx);
 
 /* Public API in OpenSSL */
+const BIGNUM *EC_GROUP_get0_cofactor(const EC_GROUP *group);
 const BIGNUM *EC_GROUP_get0_order(const EC_GROUP *group);
 
 __END_HIDDEN_DECLS