gost: add missing BN_CTX_{start,end}() pair

The new BN_CTX code enforces that the context be started before a BIGNUM
can be obtained from it via BN_CTX_get(), tests for ssl/interop and the
openssl app broke, implying missing test coverage in libcrypto itself.
Add the obviously missing bits.

reported by anton
ok jsing

1 files changed, 4 insertions, 1 deletions

diff --git a/src/lib/libcrypto/gost/gostr341001_key.c b/src/lib/libcrypto/gost/gostr341001_key.c
index af3a3fcd38..e44c48622c 100644
--- a/src/lib/libcrypto/gost/gostr341001_key.c
+++ b/src/lib/libcrypto/gost/gostr341001_key.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: gostr341001_key.c,v 1.10 2022/11/26 16:08:53 tb Exp $ */
+/* $OpenBSD: gostr341001_key.c,v 1.11 2023/01/15 13:58:44 tb Exp $ */
 /*
  * Copyright (c) 2014 Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
  * Copyright (c) 2005-2006 Cryptocom LTD
@@ -193,6 +193,8 @@ GOST_KEY_set_public_key_affine_coordinates(GOST_KEY *key, BIGNUM *x, BIGNUM *y)
         if (ctx == NULL)
                 goto err;
 
+        BN_CTX_start(ctx);
+
         point = EC_POINT_new(key->group);
         if (point == NULL)
                 goto err;
@@ -225,6 +227,7 @@ GOST_KEY_set_public_key_affine_coordinates(GOST_KEY *key, BIGNUM *x, BIGNUM *y)
 
 err:
         EC_POINT_free(point);
+        BN_CTX_end(ctx);
         BN_CTX_free(ctx);
         return ok;