Unify checking for the asn1_flag

There are only two flag values that libcrypto understands and the default
value is 1 while, helpfully, the undesirable non-default is 0. The few
existing callers set OPENSSL_EC_NAMED_CURVE or OPENSSL_EC_EXPLICIT_CURVE.
Nevertheless, the flag should be checked properly as a flag. The recent
upstream checks for EC_GROUP_get_asn1_flag(group) == OPENSSL_EC_NAMED_CURVE
don't look right either...

ok jsing

2 files changed, 4 insertions, 4 deletions

diff --git a/src/lib/libcrypto/ec/ec_ameth.c b/src/lib/libcrypto/ec/ec_ameth.c
index 754fabfb4d..903b18a8db 100644
--- a/src/lib/libcrypto/ec/ec_ameth.c
+++ b/src/lib/libcrypto/ec/ec_ameth.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: ec_ameth.c,v 1.72 2024/10/29 06:36:58 tb Exp $ */
+/* $OpenBSD: ec_ameth.c,v 1.73 2024/11/25 06:51:39 tb Exp $ */
 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
  * project 2006.
  */
@@ -104,7 +104,7 @@ eckey_get_curve_name(const EC_KEY *eckey, int *nid)
                 ECerror(EC_R_MISSING_PARAMETERS);
                 return 0;
         }
-        if (EC_GROUP_get_asn1_flag(group) != 0)
+        if ((EC_GROUP_get_asn1_flag(group) & OPENSSL_EC_NAMED_CURVE) != 0)
                 *nid = EC_GROUP_get_curve_name(group);
 
         return 1;
diff --git a/src/lib/libcrypto/ec/eck_prn.c b/src/lib/libcrypto/ec/eck_prn.c
index 012391c803..98e1a7e7bd 100644
--- a/src/lib/libcrypto/ec/eck_prn.c
+++ b/src/lib/libcrypto/ec/eck_prn.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: eck_prn.c,v 1.39 2024/11/14 10:27:59 tb Exp $ */
+/* $OpenBSD: eck_prn.c,v 1.40 2024/11/25 06:51:39 tb Exp $ */
 /*
  * Written by Nils Larsch for the OpenSSL project.
  */
@@ -330,7 +330,7 @@ ECPKParameters_print(BIO *bio, const EC_GROUP *group, int off)
                 return 0;
         }
 
-        if (EC_GROUP_get_asn1_flag(group))
+        if ((EC_GROUP_get_asn1_flag(group) & OPENSSL_EC_NAMED_CURVE) != 0)
                 return ecpk_print_asn1_parameters(bio, group, off);
 
         return ecpk_print_explicit_parameters(bio, group, off);