diff options
Diffstat (limited to 'nss/lib/freebl/ecl/ecp_jm.c')
| -rw-r--r-- | nss/lib/freebl/ecl/ecp_jm.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/nss/lib/freebl/ecl/ecp_jm.c b/nss/lib/freebl/ecl/ecp_jm.c index a1106ce..bd13fa0 100644 --- a/nss/lib/freebl/ecl/ecp_jm.c +++ b/nss/lib/freebl/ecl/ecp_jm.c @@ -127,6 +127,17 @@ ec_GFp_pt_add_jm_aff(const mp_int *px, const mp_int *py, const mp_int *pz, MP_CHECKOK(group->meth->field_mul(A, qx, A, group->meth)); MP_CHECKOK(group->meth->field_mul(B, qy, B, group->meth)); + /* Check P == Q */ + if (mp_cmp(A, px) == 0) { + if (mp_cmp(B, py) == 0) { + /* If Px == Qx && Py == Qy, double P. */ + return ec_GFp_pt_dbl_jm(px, py, pz, paz4, rx, ry, rz, raz4, + scratch, group); + } + /* If Px == Qx && Py != Qy, return point at infinity. */ + return ec_GFp_pt_set_inf_jac(rx, ry, rz); + } + /* C = A - px, D = B - py */ MP_CHECKOK(group->meth->field_sub(A, px, C, group->meth)); MP_CHECKOK(group->meth->field_sub(B, py, D, group->meth)); |