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authorWilliam Joye <wjoye@cfa.harvard.edu>2016-12-21 22:13:18 (GMT)
committerWilliam Joye <wjoye@cfa.harvard.edu>2016-12-21 22:13:18 (GMT)
commit07e464099b99459d0a37757771791598ef3395d9 (patch)
tree4ba7d8aad13735e52f59bdce7ca5ba3151ebd7e3 /tcl8.6/libtommath/bn_s_mp_add.c
parentdeb3650e37f26f651f280e480c4df3d7dde87bae (diff)
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new subtree for tcl/tk
Diffstat (limited to 'tcl8.6/libtommath/bn_s_mp_add.c')
-rw-r--r--tcl8.6/libtommath/bn_s_mp_add.c105
1 files changed, 0 insertions, 105 deletions
diff --git a/tcl8.6/libtommath/bn_s_mp_add.c b/tcl8.6/libtommath/bn_s_mp_add.c
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--- a/tcl8.6/libtommath/bn_s_mp_add.c
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@@ -1,105 +0,0 @@
-#include <tommath.h>
-#ifdef BN_S_MP_ADD_C
-/* LibTomMath, multiple-precision integer library -- Tom St Denis
- *
- * LibTomMath is a library that provides multiple-precision
- * integer arithmetic as well as number theoretic functionality.
- *
- * The library was designed directly after the MPI library by
- * 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, tomstdenis@gmail.com, http://math.libtomcrypt.com
- */
-
-/* low level addition, based on HAC pp.594, Algorithm 14.7 */
-int
-s_mp_add (mp_int * a, mp_int * b, mp_int * c)
-{
- mp_int *x;
- int olduse, res, min, max;
-
- /* find sizes, we let |a| <= |b| which means we have to sort
- * them. "x" will point to the input with the most digits
- */
- if (a->used > b->used) {
- min = b->used;
- max = a->used;
- x = a;
- } else {
- min = a->used;
- max = b->used;
- x = b;
- }
-
- /* init result */
- if (c->alloc < max + 1) {
- if ((res = mp_grow (c, max + 1)) != MP_OKAY) {
- return res;
- }
- }
-
- /* get old used digit count and set new one */
- olduse = c->used;
- c->used = max + 1;
-
- {
- register mp_digit u, *tmpa, *tmpb, *tmpc;
- register int i;
-
- /* alias for digit pointers */
-
- /* first input */
- tmpa = a->dp;
-
- /* second input */
- tmpb = b->dp;
-
- /* destination */
- tmpc = c->dp;
-
- /* zero the carry */
- u = 0;
- for (i = 0; i < min; i++) {
- /* Compute the sum at one digit, T[i] = A[i] + B[i] + U */
- *tmpc = *tmpa++ + *tmpb++ + u;
-
- /* U = carry bit of T[i] */
- u = *tmpc >> ((mp_digit)DIGIT_BIT);
-
- /* take away carry bit from T[i] */
- *tmpc++ &= MP_MASK;
- }
-
- /* now copy higher words if any, that is in A+B
- * if A or B has more digits add those in
- */
- if (min != max) {
- for (; i < max; i++) {
- /* T[i] = X[i] + U */
- *tmpc = x->dp[i] + u;
-
- /* U = carry bit of T[i] */
- u = *tmpc >> ((mp_digit)DIGIT_BIT);
-
- /* take away carry bit from T[i] */
- *tmpc++ &= MP_MASK;
- }
- }
-
- /* add carry */
- *tmpc++ = u;
-
- /* clear digits above oldused */
- for (i = c->used; i < olduse; i++) {
- *tmpc++ = 0;
- }
- }
-
- mp_clamp (c);
- return MP_OKAY;
-}
-#endif