diff options
Diffstat (limited to 'crypto/ec/ec2_mult.c')
| -rw-r--r-- | crypto/ec/ec2_mult.c | 20 |
1 files changed, 11 insertions, 9 deletions
diff --git a/crypto/ec/ec2_mult.c b/crypto/ec/ec2_mult.c index 68cc8771d5..1f9cc00aea 100644 --- a/crypto/ec/ec2_mult.c +++ b/crypto/ec/ec2_mult.c @@ -267,7 +267,7 @@ static int ec_GF2m_montgomery_point_multiply(const EC_GROUP *group, BN_CTX *ctx) { BIGNUM *x1, *x2, *z1, *z2; - int ret = 0, i; + int ret = 0, i, group_top; BN_ULONG mask, word; if (r == point) { @@ -297,10 +297,12 @@ static int ec_GF2m_montgomery_point_multiply(const EC_GROUP *group, x2 = &r->X; z2 = &r->Y; - bn_wexpand(x1, group->field.top); - bn_wexpand(z1, group->field.top); - bn_wexpand(x2, group->field.top); - bn_wexpand(z2, group->field.top); + group_top = group->field.top; + if (bn_wexpand(x1, group_top) == NULL + || bn_wexpand(z1, group_top) == NULL + || bn_wexpand(x2, group_top) == NULL + || bn_wexpand(z2, group_top) == NULL) + goto err; if (!BN_GF2m_mod_arr(x1, &point->X, group->poly)) goto err; /* x1 = x */ @@ -329,14 +331,14 @@ static int ec_GF2m_montgomery_point_multiply(const EC_GROUP *group, for (; i >= 0; i--) { word = scalar->d[i]; while (mask) { - BN_consttime_swap(word & mask, x1, x2, group->field.top); - BN_consttime_swap(word & mask, z1, z2, group->field.top); + BN_consttime_swap(word & mask, x1, x2, group_top); + BN_consttime_swap(word & mask, z1, z2, group_top); if (!gf2m_Madd(group, &point->X, x2, z2, x1, z1, ctx)) goto err; if (!gf2m_Mdouble(group, x1, z1, ctx)) goto err; - BN_consttime_swap(word & mask, x1, x2, group->field.top); - BN_consttime_swap(word & mask, z1, z2, group->field.top); + BN_consttime_swap(word & mask, x1, x2, group_top); + BN_consttime_swap(word & mask, z1, z2, group_top); mask >>= 1; } mask = BN_TBIT; |