summaryrefslogtreecommitdiff
path: root/libtommath/bn_mp_mod_2d.c
diff options
context:
space:
mode:
authorSteffen Jaeckel <s_jaeckel@gmx.de>2019-09-16 15:50:38 +0200
committerMatt Johnston <matt@ucc.asn.au>2019-09-16 21:50:38 +0800
commit615ed4e46a52b6bfe0bfc581b8c2fbcc6cc488d1 (patch)
tree12b2ba29ae4c42fc65d64d43968c5d03ab3f4452 /libtommath/bn_mp_mod_2d.c
parentfa116e983b4931010e1082dd5c8bf38bbc77718c (diff)
downloaddropbear-615ed4e46a52b6bfe0bfc581b8c2fbcc6cc488d1.tar.gz
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
* make key-generation compliant to FIPS 186.4 * fix includes in tommath_class.h * update fuzzcorpus instead of error-out * fixup fuzzing make-targets * update Makefile.in * apply necessary patches to ltm sources * clean-up not required ltm files * update to vanilla ltm 1.1.0 this already only contains the required files * remove set/get double
Diffstat (limited to 'libtommath/bn_mp_mod_2d.c')
-rw-r--r--libtommath/bn_mp_mod_2d.c64
1 files changed, 30 insertions, 34 deletions
diff --git a/libtommath/bn_mp_mod_2d.c b/libtommath/bn_mp_mod_2d.c
index 2bb86da..10d219d 100644
--- a/libtommath/bn_mp_mod_2d.c
+++ b/libtommath/bn_mp_mod_2d.c
@@ -1,4 +1,4 @@
-#include <tommath_private.h>
+#include "tommath_private.h"
#ifdef BN_MP_MOD_2D_C
/* LibTomMath, multiple-precision integer library -- Tom St Denis
*
@@ -9,47 +9,43 @@
* Michael Fromberger but has been written from scratch with
* additional optimizations in place.
*
- * The library is free for all purposes without any express
- * guarantee it works.
- *
- * Tom St Denis, tstdenis82@gmail.com, http://libtom.org
+ * SPDX-License-Identifier: Unlicense
*/
/* calc a value mod 2**b */
-int
-mp_mod_2d (mp_int * a, int b, mp_int * c)
+int mp_mod_2d(const mp_int *a, int b, mp_int *c)
{
- int x, res;
+ int x, res;
- /* if b is <= 0 then zero the int */
- if (b <= 0) {
- mp_zero (c);
- return MP_OKAY;
- }
+ /* if b is <= 0 then zero the int */
+ if (b <= 0) {
+ mp_zero(c);
+ return MP_OKAY;
+ }
- /* if the modulus is larger than the value than return */
- if (b >= (int) (a->used * DIGIT_BIT)) {
- res = mp_copy (a, c);
- return res;
- }
+ /* if the modulus is larger than the value than return */
+ if (b >= (a->used * DIGIT_BIT)) {
+ res = mp_copy(a, c);
+ return res;
+ }
- /* copy */
- if ((res = mp_copy (a, c)) != MP_OKAY) {
- return res;
- }
+ /* copy */
+ if ((res = mp_copy(a, c)) != MP_OKAY) {
+ return res;
+ }
- /* zero digits above the last digit of the modulus */
- for (x = (b / DIGIT_BIT) + (((b % DIGIT_BIT) == 0) ? 0 : 1); x < c->used; x++) {
- c->dp[x] = 0;
- }
- /* clear the digit that is not completely outside/inside the modulus */
- c->dp[b / DIGIT_BIT] &=
- (mp_digit) ((((mp_digit) 1) << (((mp_digit) b) % DIGIT_BIT)) - ((mp_digit) 1));
- mp_clamp (c);
- return MP_OKAY;
+ /* zero digits above the last digit of the modulus */
+ for (x = (b / DIGIT_BIT) + (((b % DIGIT_BIT) == 0) ? 0 : 1); x < c->used; x++) {
+ c->dp[x] = 0;
+ }
+ /* clear the digit that is not completely outside/inside the modulus */
+ c->dp[b / DIGIT_BIT] &=
+ ((mp_digit)1 << (mp_digit)(b % DIGIT_BIT)) - (mp_digit)1;
+ mp_clamp(c);
+ return MP_OKAY;
}
#endif
-/* ref: $Format:%D$ */
-/* git commit: $Format:%H$ */
-/* commit time: $Format:%ai$ */
+/* ref: HEAD -> master, tag: v1.1.0 */
+/* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
+/* commit time: 2019-01-28 20:32:32 +0100 */