Mercurial > dropbear

annotate libtommath/bn_mp_div_2d.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_DIV_2D_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 /* shift right by a certain bit count (store quotient in c, optional remainder in d) */
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19 int mp_div_2d (mp_int * a, int b, mp_int * c, mp_int * d)
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20 {
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21 mp_digit D, r, rr;
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22 int x, res;
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23 mp_int t;
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24
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25
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26 /* if the shift count is <= 0 then we do no work */
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27 if (b <= 0) {
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28 res = mp_copy (a, c);
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29 if (d != NULL) {
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30 mp_zero (d);
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31 }
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32 return res;
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33 }
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34
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35 if ((res = mp_init (&t)) != MP_OKAY) {
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36 return res;
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37 }
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38
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39 /* get the remainder */
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40 if (d != NULL) {
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41 if ((res = mp_mod_2d (a, b, &t)) != MP_OKAY) {
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42 mp_clear (&t);
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43 return res;
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44 }
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45 }
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46
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47 /* copy */
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48 if ((res = mp_copy (a, c)) != MP_OKAY) {
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49 mp_clear (&t);
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50 return res;
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51 }
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52
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53 /* shift by as many digits in the bit count */
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54 if (b >= (int)DIGIT_BIT) {
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55 mp_rshd (c, b / DIGIT_BIT);
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56 }
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57
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58 /* shift any bit count < DIGIT_BIT */
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59 D = (mp_digit) (b % DIGIT_BIT);
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60 if (D != 0) {
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61 register mp_digit *tmpc, mask, shift;
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62
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63 /* mask */
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64 mask = (((mp_digit)1) << D) - 1;
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65
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66 /* shift for lsb */
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67 shift = DIGIT_BIT - D;
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68
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69 /* alias */
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70 tmpc = c->dp + (c->used - 1);
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71
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72 /* carry */
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73 r = 0;
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Matt Johnston <matt@ucc.asn.au>
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74 for (x = c->used - 1; x >= 0; x--) {
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Matt Johnston <matt@ucc.asn.au>
parents:
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75 /* get the lower bits of this word in a temp */
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Matt Johnston <matt@ucc.asn.au>
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76 rr = *tmpc & mask;
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77
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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78 /* shift the current word and mix in the carry bits from the previous word */
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
79 *tmpc = (*tmpc >> D) | (r << shift);
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
80 --tmpc;
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Matt Johnston <matt@ucc.asn.au>
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81
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Matt Johnston <matt@ucc.asn.au>
parents:
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82 /* set the carry to the carry bits of the current word found above */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
83 r = rr;
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Matt Johnston <matt@ucc.asn.au>
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84 }
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Matt Johnston <matt@ucc.asn.au>
parents:
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85 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
86 mp_clamp (c);
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
87 if (d != NULL) {
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
88 mp_exch (&t, d);
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Matt Johnston <matt@ucc.asn.au>
parents:
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89 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90 mp_clear (&t);
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 return MP_OKAY;
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93 #endif
389
5ff8218bcee9 propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)
Matt Johnston <matt@ucc.asn.au>
parents: 284
diff changeset
94
5ff8218bcee9 propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)
Matt Johnston <matt@ucc.asn.au>
parents: 284
diff changeset
95 /* $Source: /cvs/libtom/libtommath/bn_mp_div_2d.c,v $ */
5ff8218bcee9 propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)
Matt Johnston <matt@ucc.asn.au>
parents: 284
diff changeset
96 /* $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
97 /* $Date: 2006/03/31 14:18:44 $ */