Mercurial > dropbear

annotate libtommath/bn_s_mp_add.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
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1 #include <tommath.h>
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2 #ifdef BN_S_MP_ADD_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 /* low level addition, based on HAC pp.594, Algorithm 14.7 */
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19 int
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20 s_mp_add (mp_int * a, mp_int * b, mp_int * c)
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21 {
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22 mp_int *x;
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23 int olduse, res, min, max;
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24
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25 /* find sizes, we let |a| <= |b| which means we have to sort
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26 * them. "x" will point to the input with the most digits
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27 */
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28 if (a->used > b->used) {
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29 min = b->used;
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30 max = a->used;
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31 x = a;
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32 } else {
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33 min = a->used;
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34 max = b->used;
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35 x = b;
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36 }
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37
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38 /* init result */
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39 if (c->alloc < max + 1) {
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40 if ((res = mp_grow (c, max + 1)) != MP_OKAY) {
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41 return res;
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42 }
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43 }
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44
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45 /* get old used digit count and set new one */
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46 olduse = c->used;
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47 c->used = max + 1;
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48
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49 {
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50 register mp_digit u, *tmpa, *tmpb, *tmpc;
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51 register int i;
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52
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53 /* alias for digit pointers */
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54
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55 /* first input */
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56 tmpa = a->dp;
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57
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58 /* second input */
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59 tmpb = b->dp;
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60
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61 /* destination */
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62 tmpc = c->dp;
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63
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64 /* zero the carry */
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65 u = 0;
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66 for (i = 0; i < min; i++) {
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67 /* Compute the sum at one digit, T[i] = A[i] + B[i] + U */
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68 *tmpc = *tmpa++ + *tmpb++ + u;
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69
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70 /* U = carry bit of T[i] */
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71 u = *tmpc >> ((mp_digit)DIGIT_BIT);
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72
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73 /* take away carry bit from T[i] */
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74 *tmpc++ &= MP_MASK;
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75 }
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76
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77 /* now copy higher words if any, that is in A+B
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78 * if A or B has more digits add those in
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79 */
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80 if (min != max) {
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81 for (; i < max; i++) {
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Matt Johnston <matt@ucc.asn.au>
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82 /* T[i] = X[i] + U */
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83 *tmpc = x->dp[i] + u;
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84
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Matt Johnston <matt@ucc.asn.au>
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85 /* U = carry bit of T[i] */
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Matt Johnston <matt@ucc.asn.au>
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86 u = *tmpc >> ((mp_digit)DIGIT_BIT);
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87
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Matt Johnston <matt@ucc.asn.au>
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88 /* take away carry bit from T[i] */
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Matt Johnston <matt@ucc.asn.au>
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89 *tmpc++ &= MP_MASK;
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90 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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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 /* add carry */
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94 *tmpc++ = u;
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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95
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96 /* clear digits above oldused */
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97 for (i = c->used; i < olduse; i++) {
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
98 *tmpc++ = 0;
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
99 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
100 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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101
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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102 mp_clamp (c);
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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103 return MP_OKAY;
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:
diff changeset
105 #endif
389
5ff8218bcee9 propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)
Matt Johnston <matt@ucc.asn.au>
parents: 284
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106
5ff8218bcee9 propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)
Matt Johnston <matt@ucc.asn.au>
parents: 284
diff changeset
107 /* $Source: /cvs/libtom/libtommath/bn_s_mp_add.c,v $ */
5ff8218bcee9 propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)
Matt Johnston <matt@ucc.asn.au>
parents: 284
diff changeset
108 /* $Revision: 1.3 $ */
5ff8218bcee9 propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)
Matt Johnston <matt@ucc.asn.au>
parents: 284
diff changeset
109 /* $Date: 2006/03/31 14:18:44 $ */