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comparison libtommath/bn_mp_karatsuba_mul.c @ 1436:60fc6476e044

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Update to libtommath v1.0
author Matt Johnston <matt@ucc.asn.au>
date Sat, 24 Jun 2017 22:37:14 +0800
parents 5ff8218bcee9
children 8bba51a55704
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1435:f849a5ca2efc 1436:60fc6476e044
1 #include <tommath.h> 1 #include <tommath_private.h>
2 #ifdef BN_MP_KARATSUBA_MUL_C 2 #ifdef BN_MP_KARATSUBA_MUL_C
3 /* LibTomMath, multiple-precision integer library -- Tom St Denis 3 /* LibTomMath, multiple-precision integer library -- Tom St Denis
4 * 4 *
5 * LibTomMath is a library that provides multiple-precision 5 * LibTomMath is a library that provides multiple-precision
6 * integer arithmetic as well as number theoretic functionality. 6 * integer arithmetic as well as number theoretic functionality.
10 * additional optimizations in place. 10 * additional optimizations in place.
11 * 11 *
12 * The library is free for all purposes without any express 12 * The library is free for all purposes without any express
13 * guarantee it works. 13 * guarantee it works.
14 * 14 *
15 * Tom St Denis, [email protected], http://math.libtomcrypt.com 15 * Tom St Denis, [email protected], http://libtom.org
16 */ 16 */
17 17
18 /* c = |a| * |b| using Karatsuba Multiplication using 18 /* c = |a| * |b| using Karatsuba Multiplication using
19 * three half size multiplications 19 * three half size multiplications
20 * 20 *
80 x0.used = y0.used = B; 80 x0.used = y0.used = B;
81 x1.used = a->used - B; 81 x1.used = a->used - B;
82 y1.used = b->used - B; 82 y1.used = b->used - B;
83 83
84 { 84 {
85 register int x; 85 int x;
86 register mp_digit *tmpa, *tmpb, *tmpx, *tmpy; 86 mp_digit *tmpa, *tmpb, *tmpx, *tmpy;
87 87
88 /* we copy the digits directly instead of using higher level functions 88 /* we copy the digits directly instead of using higher level functions
89 * since we also need to shift the digits 89 * since we also need to shift the digits
90 */ 90 */
91 tmpa = a->dp; 91 tmpa = a->dp;
160 ERR: 160 ERR:
161 return err; 161 return err;
162 } 162 }
163 #endif 163 #endif
164 164
165 /* $Source: /cvs/libtom/libtommath/bn_mp_karatsuba_mul.c,v $ */ 165 /* $Source$ */
166 /* $Revision: 1.5 $ */ 166 /* $Revision$ */
167 /* $Date: 2006/03/31 14:18:44 $ */ 167 /* $Date$ */