diff options
Diffstat (limited to 'mpn')
| -rw-r--r-- | mpn/asm-defs.m4 | 1 | ||||
| -rw-r--r-- | mpn/generic/powm_sec.c | 25 | ||||
| -rw-r--r-- | mpn/generic/tabselect.c | 48 |
3 files changed, 49 insertions, 25 deletions
diff --git a/mpn/asm-defs.m4 b/mpn/asm-defs.m4 index 4f049b21b..7a5639fbe 100644 --- a/mpn/asm-defs.m4 +++ b/mpn/asm-defs.m4 @@ -1471,6 +1471,7 @@ define_mpn(sub_n) define_mpn(sub_nc) define_mpn(submul_1) define_mpn(submul_1c) +define_mpn(tabselect) define_mpn(umul_ppmm) define_mpn(umul_ppmm_r) define_mpn(udiv_qrnnd) diff --git a/mpn/generic/powm_sec.c b/mpn/generic/powm_sec.c index c6358947b..d7ed2b486 100644 --- a/mpn/generic/powm_sec.c +++ b/mpn/generic/powm_sec.c @@ -320,31 +320,6 @@ mpn_powm_sec (mp_ptr rp, mp_srcptr bp, mp_size_t bn, TMP_FREE; } -#if ! HAVE_NATIVE_mpn_tabselect -/* Select entry `which' from table `tab', which has nents entries, each `n' - limbs. Store the selected entry at rp. Reads entire table to avoid - side-channel information leaks. O(n*nents). - FIXME: Move to its own file. */ -void -mpn_tabselect (volatile mp_limb_t *rp, volatile mp_limb_t *tab, mp_size_t n, - mp_size_t nents, mp_size_t which) -{ - mp_size_t k, i; - mp_limb_t mask; - volatile mp_limb_t *tp; - - for (k = 0; k < nents; k++) - { - mask = -(mp_limb_t) (which == k); - tp = tab + n * k; - for (i = 0; i < n; i++) - { - rp[i] = (rp[i] & ~mask) | (tp[i] & mask); - } - } -} -#endif - mp_size_t mpn_powm_sec_itch (mp_size_t bn, mp_size_t en, mp_size_t n) { diff --git a/mpn/generic/tabselect.c b/mpn/generic/tabselect.c new file mode 100644 index 000000000..02e52fdc0 --- /dev/null +++ b/mpn/generic/tabselect.c @@ -0,0 +1,48 @@ +/* mpn_tabselect. + + THIS IS AN INTERNAL FUNCTION WITH A MUTABLE INTERFACE. IT IS ONLY + SAFE TO REACH THIS FUNCTION THROUGH DOCUMENTED INTERFACES. + +Copyright 2007, 2008, 2009, 2011 Free Software Foundation, Inc. + +This file is part of the GNU MP Library. + +The GNU MP Library is free software; you can redistribute it and/or modify +it under the terms of the GNU Lesser General Public License as published by +the Free Software Foundation; either version 3 of the License, or (at your +option) any later version. + +The GNU MP Library is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY +or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public +License for more details. + +You should have received a copy of the GNU Lesser General Public License +along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */ + +#include "gmp.h" +#include "gmp-impl.h" + + +/* Select entry `which' from table `tab', which has nents entries, each `n' + limbs. Store the selected entry at rp. Reads entire table to avoid + side-channel information leaks. O(n*nents). + FIXME: Move to its own file. */ +void +mpn_tabselect (volatile mp_limb_t *rp, volatile mp_limb_t *tab, mp_size_t n, + mp_size_t nents, mp_size_t which) +{ + mp_size_t k, i; + mp_limb_t mask; + volatile mp_limb_t *tp; + + for (k = 0; k < nents; k++) + { + mask = -(mp_limb_t) (which == k); + tp = tab + n * k; + for (i = 0; i < n; i++) + { + rp[i] = (rp[i] & ~mask) | (tp[i] & mask); + } + } +} |