diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/libcrypto/ec/ec_lib.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/lib/libcrypto/ec/ec_lib.c b/lib/libcrypto/ec/ec_lib.c index 455d44a9427..888f1edfcf2 100644 --- a/lib/libcrypto/ec/ec_lib.c +++ b/lib/libcrypto/ec/ec_lib.c @@ -1,4 +1,4 @@ -/* $OpenBSD: ec_lib.c,v 1.43 2022/03/29 13:48:40 tb Exp $ */ +/* $OpenBSD: ec_lib.c,v 1.44 2022/03/29 14:03:12 tb Exp $ */ /* * Originally written by Bodo Moeller for the OpenSSL project. */ @@ -385,6 +385,12 @@ EC_GROUP_set_generator(EC_GROUP *group, const EC_POINT *generator, } else if (!ec_guess_cofactor(group)) return 0; + /* Use Hasse's theorem to bound the cofactor. */ + if (BN_num_bits(&group->cofactor) > BN_num_bits(&group->field) + 1) { + ECerror(EC_R_INVALID_GROUP_ORDER); + return 0; + } + return 1; } |