Mercurial > dropbear

annotate libtommath/bn_mp_div_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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1 #include <tommath.h>
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2 #ifdef BN_MP_DIV_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 static int s_is_power_of_two(mp_digit b, int *p)
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19 {
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20 int x;
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21
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22 for (x = 1; x < DIGIT_BIT; x++) {
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23 if (b == (((mp_digit)1)<<x)) {
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24 *p = x;
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25 return 1;
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26 }
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27 }
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28 return 0;
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29 }
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30
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31 /* single digit division (based on routine from MPI) */
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32 int mp_div_d (mp_int * a, mp_digit b, mp_int * c, mp_digit * d)
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33 {
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34 mp_int q;
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35 mp_word w;
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36 mp_digit t;
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37 int res, ix;
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38
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39 /* cannot divide by zero */
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40 if (b == 0) {
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41 return MP_VAL;
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42 }
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43
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44 /* quick outs */
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45 if (b == 1 || mp_iszero(a) == 1) {
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46 if (d != NULL) {
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47 *d = 0;
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48 }
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49 if (c != NULL) {
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50 return mp_copy(a, c);
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51 }
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52 return MP_OKAY;
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53 }
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54
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55 /* power of two ? */
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56 if (s_is_power_of_two(b, &ix) == 1) {
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57 if (d != NULL) {
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58 *d = a->dp[0] & ((((mp_digit)1)<<ix) - 1);
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59 }
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60 if (c != NULL) {
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61 return mp_div_2d(a, ix, c, NULL);
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62 }
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63 return MP_OKAY;
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64 }
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65
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66 #ifdef BN_MP_DIV_3_C
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67 /* three? */
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68 if (b == 3) {
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69 return mp_div_3(a, c, d);
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70 }
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71 #endif
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72
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73 /* no easy answer [c'est la vie]. Just division */
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74 if ((res = mp_init_size(&q, a->used)) != MP_OKAY) {
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75 return res;
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76 }
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77
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78 q.used = a->used;
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Matt Johnston <matt@ucc.asn.au>
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79 q.sign = a->sign;
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80 w = 0;
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Matt Johnston <matt@ucc.asn.au>
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81 for (ix = a->used - 1; ix >= 0; ix--) {
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Matt Johnston <matt@ucc.asn.au>
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82 w = (w << ((mp_word)DIGIT_BIT)) | ((mp_word)a->dp[ix]);
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Matt Johnston <matt@ucc.asn.au>
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83
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Matt Johnston <matt@ucc.asn.au>
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84 if (w >= b) {
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Matt Johnston <matt@ucc.asn.au>
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85 t = (mp_digit)(w / b);
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Matt Johnston <matt@ucc.asn.au>
parents:
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86 w -= ((mp_word)t) * ((mp_word)b);
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Matt Johnston <matt@ucc.asn.au>
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87 } else {
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Matt Johnston <matt@ucc.asn.au>
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88 t = 0;
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Matt Johnston <matt@ucc.asn.au>
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89 }
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
90 q.dp[ix] = (mp_digit)t;
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 if (d != NULL) {
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94 *d = (mp_digit)w;
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:
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96
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97 if (c != NULL) {
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
98 mp_clamp(&q);
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
99 mp_exch(&q, c);
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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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 mp_clear(&q);
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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102
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 res;
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
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
106 #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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107
5ff8218bcee9 propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)
Matt Johnston <matt@ucc.asn.au>
parents: 284
diff changeset
108 /* $Source: /cvs/libtom/libtommath/bn_mp_div_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
109 /* $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
110 /* $Date: 2006/03/31 14:18:44 $ */