Mercurial > dropbear

annotate libtommath/bn_mp_lshd.c @ 1156:a8f4dade70e5

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avoid getpass when not used some systems (like android's bionic) do not provide getpass. you can disable ENABLE_CLI_PASSWORD_AUTH & ENABLE_CLI_INTERACT_AUTH to avoid its use (and rely on pubkey auth), but the link still fails because the support file calls getpass. do not define this func if both of those auth methods are not used.
author Mike Frysinger <vapier@gentoo.org>
date Wed, 21 Oct 2015 22:39:55 +0800
parents 5ff8218bcee9
children 60fc6476e044
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1 #include <tommath.h>
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2 #ifdef BN_MP_LSHD_C
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis
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4 *
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5 * LibTomMath is a library that provides multiple-precision
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6 * integer arithmetic as well as number theoretic functionality.
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7 *
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8 * The library was designed directly after the MPI library by
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9 * Michael Fromberger but has been written from scratch with
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10 * additional optimizations in place.
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11 *
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12 * The library is free for all purposes without any express
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13 * guarantee it works.
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14 *
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15 * Tom St Denis, [email protected], http://math.libtomcrypt.com
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16 */
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17
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18 /* shift left a certain amount of digits */
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19 int mp_lshd (mp_int * a, int b)
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20 {
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21 int x, res;
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22
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23 /* if its less than zero return */
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24 if (b <= 0) {
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25 return MP_OKAY;
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26 }
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27
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28 /* grow to fit the new digits */
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29 if (a->alloc < a->used + b) {
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30 if ((res = mp_grow (a, a->used + b)) != MP_OKAY) {
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31 return res;
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32 }
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33 }
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34
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35 {
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36 register mp_digit *top, *bottom;
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38 /* increment the used by the shift amount then copy upwards */
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39 a->used += b;
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40
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41 /* top */
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42 top = a->dp + a->used - 1;
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43
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44 /* base */
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45 bottom = a->dp + a->used - 1 - b;
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46
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47 /* much like mp_rshd this is implemented using a sliding window
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48 * except the window goes the otherway around. Copying from
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49 * the bottom to the top. see bn_mp_rshd.c for more info.
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50 */
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51 for (x = a->used - 1; x >= b; x--) {
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52 *top-- = *bottom--;
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53 }
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54
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55 /* zero the lower digits */
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56 top = a->dp;
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57 for (x = 0; x < b; x++) {
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58 *top++ = 0;
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59 }
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60 }
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61 return MP_OKAY;
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62 }
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63 #endif
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64
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65 /* $Source: /cvs/libtom/libtommath/bn_mp_lshd.c,v $ */
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66 /* $Revision: 1.3 $ */
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67 /* $Date: 2006/03/31 14:18:44 $ */