Mercurial > dropbear
comparison libtommath/bn_mp_clamp.c @ 1436:60fc6476e044
Update to libtommath v1.0
author | Matt Johnston <matt@ucc.asn.au> |
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date | Sat, 24 Jun 2017 22:37:14 +0800 |
parents | 5ff8218bcee9 |
children | 8bba51a55704 |
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1435:f849a5ca2efc | 1436:60fc6476e044 |
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1 #include <tommath.h> | 1 #include <tommath_private.h> |
2 #ifdef BN_MP_CLAMP_C | 2 #ifdef BN_MP_CLAMP_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 /* trim unused digits | 18 /* trim unused digits |
19 * | 19 * |
20 * This is used to ensure that leading zero digits are | 20 * This is used to ensure that leading zero digits are |
26 mp_clamp (mp_int * a) | 26 mp_clamp (mp_int * a) |
27 { | 27 { |
28 /* decrease used while the most significant digit is | 28 /* decrease used while the most significant digit is |
29 * zero. | 29 * zero. |
30 */ | 30 */ |
31 while (a->used > 0 && a->dp[a->used - 1] == 0) { | 31 while ((a->used > 0) && (a->dp[a->used - 1] == 0)) { |
32 --(a->used); | 32 --(a->used); |
33 } | 33 } |
34 | 34 |
35 /* reset the sign flag if used == 0 */ | 35 /* reset the sign flag if used == 0 */ |
36 if (a->used == 0) { | 36 if (a->used == 0) { |
37 a->sign = MP_ZPOS; | 37 a->sign = MP_ZPOS; |
38 } | 38 } |
39 } | 39 } |
40 #endif | 40 #endif |
41 | 41 |
42 /* $Source: /cvs/libtom/libtommath/bn_mp_clamp.c,v $ */ | 42 /* $Source$ */ |
43 /* $Revision: 1.3 $ */ | 43 /* $Revision$ */ |
44 /* $Date: 2006/03/31 14:18:44 $ */ | 44 /* $Date$ */ |