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annotate libtommath/bn_mp_add_d.c @ 1671:5c8913b7464c

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Mention Ed25519 in dropbearkey man (#94)
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Mon, 25 May 2020 18:28:27 +0500
parents f52919ffd3b1
children 1051e4eea25a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_ADD_D_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 * SPDX-License-Identifier: Unlicense
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13 */
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14
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15 /* single digit addition */
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16 int mp_add_d(const mp_int *a, mp_digit b, mp_int *c)
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17 {
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18 int res, ix, oldused;
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19 mp_digit *tmpa, *tmpc, mu;
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20
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21 /* grow c as required */
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22 if (c->alloc < (a->used + 1)) {
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23 if ((res = mp_grow(c, a->used + 1)) != MP_OKAY) {
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24 return res;
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25 }
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26 }
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27
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28 /* if a is negative and |a| >= b, call c = |a| - b */
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29 if ((a->sign == MP_NEG) && ((a->used > 1) || (a->dp[0] >= b))) {
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30 mp_int a_ = *a;
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31 /* temporarily fix sign of a */
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32 a_.sign = MP_ZPOS;
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33
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34 /* c = |a| - b */
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35 res = mp_sub_d(&a_, b, c);
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36
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37 /* fix sign */
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38 c->sign = MP_NEG;
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39
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40 /* clamp */
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41 mp_clamp(c);
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42
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43 return res;
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44 }
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45
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46 /* old number of used digits in c */
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47 oldused = c->used;
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48
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49 /* source alias */
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50 tmpa = a->dp;
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51
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52 /* destination alias */
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53 tmpc = c->dp;
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54
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55 /* if a is positive */
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56 if (a->sign == MP_ZPOS) {
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57 /* add digit, after this we're propagating
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58 * the carry.
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59 */
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60 *tmpc = *tmpa++ + b;
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61 mu = *tmpc >> DIGIT_BIT;
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62 *tmpc++ &= MP_MASK;
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63
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64 /* now handle rest of the digits */
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65 for (ix = 1; ix < a->used; ix++) {
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66 *tmpc = *tmpa++ + mu;
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67 mu = *tmpc >> DIGIT_BIT;
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68 *tmpc++ &= MP_MASK;
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69 }
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70 /* set final carry */
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71 ix++;
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72 *tmpc++ = mu;
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73
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74 /* setup size */
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75 c->used = a->used + 1;
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76 } else {
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77 /* a was negative and |a| < b */
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78 c->used = 1;
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79
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80 /* the result is a single digit */
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81 if (a->used == 1) {
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82 *tmpc++ = b - a->dp[0];
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83 } else {
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84 *tmpc++ = b;
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85 }
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86
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87 /* setup count so the clearing of oldused
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88 * can fall through correctly
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89 */
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90 ix = 1;
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91 }
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92
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93 /* sign always positive */
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94 c->sign = MP_ZPOS;
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95
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96 /* now zero to oldused */
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97 while (ix++ < oldused) {
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98 *tmpc++ = 0;
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99 }
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100 mp_clamp(c);
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101
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f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
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102 return MP_OKAY;
284
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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103 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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104
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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105 #endif
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Matt Johnston <matt@ucc.asn.au>
parents: 284
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106
1655
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
diff changeset
107 /* ref: HEAD -> master, tag: v1.1.0 */
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
diff changeset
108 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
diff changeset
109 /* commit time: 2019-01-28 20:32:32 +0100 */