Mercurial > dropbear

annotate libtommath/bn_mp_add_d.c @ 994:5c5ade336926

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Prefer stronger algorithms in algorithm negotiation. Prefer diffie-hellman-group14-sha1 (2048 bit) over diffie-hellman-group1-sha1 (1024 bit). Due to meet-in-the-middle attacks the effective key length of three key 3DES is 112 bits. AES is stronger and faster then 3DES. Prefer to delay the start of compression until after authentication has completed. This avoids exposing compression code to attacks from unauthenticated users. (github pull request #9)
author Fedor Brunner <fedor.brunner@azet.sk>
date Fri, 23 Jan 2015 23:00:25 +0800
parents 5ff8218bcee9
children 60fc6476e044
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
284
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diff changeset
1 #include <tommath.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 * The library is free for all purposes without any express
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13 * guarantee it works.
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14 *
389
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15 * Tom St Denis, [email protected], http://math.libtomcrypt.com
284
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16 */
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17
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18 /* single digit addition */
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19 int
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20 mp_add_d (mp_int * a, mp_digit b, mp_int * c)
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21 {
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22 int res, ix, oldused;
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23 mp_digit *tmpa, *tmpc, mu;
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24
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25 /* grow c as required */
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26 if (c->alloc < a->used + 1) {
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27 if ((res = mp_grow(c, a->used + 1)) != MP_OKAY) {
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28 return res;
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29 }
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30 }
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31
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32 /* if a is negative and |a| >= b, call c = |a| - b */
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33 if (a->sign == MP_NEG && (a->used > 1 || a->dp[0] >= b)) {
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34 /* temporarily fix sign of a */
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35 a->sign = MP_ZPOS;
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36
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37 /* c = |a| - b */
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38 res = mp_sub_d(a, b, c);
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39
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40 /* fix sign */
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Matt Johnston <matt@ucc.asn.au>
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41 a->sign = c->sign = MP_NEG;
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42
389
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43 /* clamp */
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44 mp_clamp(c);
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45
284
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46 return res;
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47 }
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48
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49 /* old number of used digits in c */
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50 oldused = c->used;
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51
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52 /* sign always positive */
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53 c->sign = MP_ZPOS;
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54
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55 /* source alias */
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56 tmpa = a->dp;
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57
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58 /* destination alias */
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59 tmpc = c->dp;
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60
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61 /* if a is positive */
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62 if (a->sign == MP_ZPOS) {
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63 /* add digit, after this we're propagating
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64 * the carry.
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65 */
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66 *tmpc = *tmpa++ + b;
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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 /* now handle rest of the digits */
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71 for (ix = 1; ix < a->used; ix++) {
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72 *tmpc = *tmpa++ + mu;
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Matt Johnston <matt@ucc.asn.au>
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73 mu = *tmpc >> DIGIT_BIT;
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Matt Johnston <matt@ucc.asn.au>
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74 *tmpc++ &= MP_MASK;
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75 }
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76 /* set final carry */
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Matt Johnston <matt@ucc.asn.au>
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77 ix++;
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Matt Johnston <matt@ucc.asn.au>
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78 *tmpc++ = mu;
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79
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80 /* setup size */
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Matt Johnston <matt@ucc.asn.au>
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81 c->used = a->used + 1;
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Matt Johnston <matt@ucc.asn.au>
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82 } else {
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Matt Johnston <matt@ucc.asn.au>
parents:
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83 /* a was negative and |a| < b */
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Matt Johnston <matt@ucc.asn.au>
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84 c->used = 1;
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85
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Matt Johnston <matt@ucc.asn.au>
parents:
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86 /* the result is a single digit */
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
87 if (a->used == 1) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
88 *tmpc++ = b - a->dp[0];
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Matt Johnston <matt@ucc.asn.au>
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89 } else {
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Matt Johnston <matt@ucc.asn.au>
parents:
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90 *tmpc++ = b;
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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92
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93 /* setup count so the clearing of oldused
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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94 * can fall through correctly
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95 */
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96 ix = 1;
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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97 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
98
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
99 /* now zero to oldused */
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
100 while (ix++ < oldused) {
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
101 *tmpc++ = 0;
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
102 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
103 mp_clamp(c);
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
104
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
105 return MP_OKAY;
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
106 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
107
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
108 #endif
389
5ff8218bcee9 propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)
Matt Johnston <matt@ucc.asn.au>
parents: 284
diff changeset
109
5ff8218bcee9 propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)
Matt Johnston <matt@ucc.asn.au>
parents: 284
diff changeset
110 /* $Source: /cvs/libtom/libtommath/bn_mp_add_d.c,v $ */
5ff8218bcee9 propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)
Matt Johnston <matt@ucc.asn.au>
parents: 284
diff changeset
111 /* $Revision: 1.4 $ */
5ff8218bcee9 propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)
Matt Johnston <matt@ucc.asn.au>
parents: 284
diff changeset
112 /* $Date: 2006/03/31 14:18:44 $ */