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comparison libtommath/bn_mp_div_2d.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_DIV_2D_C 2 #ifdef BN_MP_DIV_2D_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 /* shift right by a certain bit count (store quotient in c, optional remainder in d) */ 18 /* shift right by a certain bit count (store quotient in c, optional remainder in d) */
19 int mp_div_2d (mp_int * a, int b, mp_int * c, mp_int * d) 19 int mp_div_2d (mp_int * a, int b, mp_int * c, mp_int * d)
20 { 20 {
56 } 56 }
57 57
58 /* shift any bit count < DIGIT_BIT */ 58 /* shift any bit count < DIGIT_BIT */
59 D = (mp_digit) (b % DIGIT_BIT); 59 D = (mp_digit) (b % DIGIT_BIT);
60 if (D != 0) { 60 if (D != 0) {
61 register mp_digit *tmpc, mask, shift; 61 mp_digit *tmpc, mask, shift;
62 62
63 /* mask */ 63 /* mask */
64 mask = (((mp_digit)1) << D) - 1; 64 mask = (((mp_digit)1) << D) - 1;
65 65
66 /* shift for lsb */ 66 /* shift for lsb */
90 mp_clear (&t); 90 mp_clear (&t);
91 return MP_OKAY; 91 return MP_OKAY;
92 } 92 }
93 #endif 93 #endif
94 94
95 /* $Source: /cvs/libtom/libtommath/bn_mp_div_2d.c,v $ */ 95 /* $Source$ */
96 /* $Revision: 1.3 $ */ 96 /* $Revision$ */
97 /* $Date: 2006/03/31 14:18:44 $ */ 97 /* $Date$ */