diff options
| author | Theo Buehler <tb@cvs.openbsd.org> | 2018-11-06 06:59:26 +0000 |
|---|---|---|
| committer | Theo Buehler <tb@cvs.openbsd.org> | 2018-11-06 06:59:26 +0000 |
| commit | e4ba8484aecdc6ca0d6a2945a25aa5bc8fe27c63 (patch) | |
| tree | d5c8c81fb10cc138a4589c56a2cce14988e54e58 /lib/libcrypto/ec | |
| parent | db4809da46f401264c79d898e0a7d7484ffe923c (diff) | |
Unset Z_is_zero after applying coordinate blinding and
re-enable coordinate blinding.
ok jsing
Diffstat (limited to 'lib/libcrypto/ec')
| -rw-r--r-- | lib/libcrypto/ec/ecp_smpl.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/lib/libcrypto/ec/ecp_smpl.c b/lib/libcrypto/ec/ecp_smpl.c index d3fcd99670c..e379a74fb1d 100644 --- a/lib/libcrypto/ec/ecp_smpl.c +++ b/lib/libcrypto/ec/ecp_smpl.c @@ -1,4 +1,4 @@ -/* $OpenBSD: ecp_smpl.c,v 1.26 2018/11/06 02:16:13 tb Exp $ */ +/* $OpenBSD: ecp_smpl.c,v 1.27 2018/11/06 06:59:25 tb Exp $ */ /* Includes code written by Lenka Fibikova <fibikova@exp-math.uni-essen.de> * for the OpenSSL project. * Includes code written by Bodo Moeller for the OpenSSL project. @@ -1463,6 +1463,9 @@ ec_GFp_simple_blind_coordinates(const EC_GROUP *group, EC_POINT *p, BN_CTX *ctx) if (!group->meth->field_mul(group, &p->Y, tmp, &p->Y, ctx)) goto err; + /* Disable optimized arithmetics after replacing Z by lambda * Z. */ + p->Z_is_one = 0; + ret = 1; err: @@ -1599,10 +1602,8 @@ ec_GFp_simple_mul_ct(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar, * Apply coordinate blinding for EC_POINT if the underlying EC_METHOD * implements it. */ -#if 0 if (!ec_point_blind_coordinates(group, s, ctx)) goto err; -#endif /* top bit is a 1, in a fixed pos */ if (!EC_POINT_copy(r, s)) |