Mercurial > dropbear

annotate libtommath/bn_fast_s_mp_mul_high_digs.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:
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1 #include <tommath.h>
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2 #ifdef BN_FAST_S_MP_MUL_HIGH_DIGS_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 *
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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 /* this is a modified version of fast_s_mul_digs that only produces
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19 * output digits *above* digs. See the comments for fast_s_mul_digs
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20 * to see how it works.
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21 *
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22 * This is used in the Barrett reduction since for one of the multiplications
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23 * only the higher digits were needed. This essentially halves the work.
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24 *
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25 * Based on Algorithm 14.12 on pp.595 of HAC.
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26 */
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27 int fast_s_mp_mul_high_digs (mp_int * a, mp_int * b, mp_int * c, int digs)
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28 {
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29 int olduse, res, pa, ix, iz;
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30 mp_digit W[MP_WARRAY];
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31 mp_word _W;
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32
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33 /* grow the destination as required */
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34 pa = a->used + b->used;
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35 if (c->alloc < pa) {
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36 if ((res = mp_grow (c, pa)) != MP_OKAY) {
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37 return res;
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38 }
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39 }
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40
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41 /* number of output digits to produce */
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42 pa = a->used + b->used;
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43 _W = 0;
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44 for (ix = digs; ix < pa; ix++) {
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45 int tx, ty, iy;
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46 mp_digit *tmpx, *tmpy;
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47
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48 /* get offsets into the two bignums */
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49 ty = MIN(b->used-1, ix);
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50 tx = ix - ty;
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51
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52 /* setup temp aliases */
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53 tmpx = a->dp + tx;
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54 tmpy = b->dp + ty;
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55
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56 /* this is the number of times the loop will iterrate, essentially its
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57 while (tx++ < a->used && ty-- >= 0) { ... }
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58 */
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59 iy = MIN(a->used-tx, ty+1);
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60
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61 /* execute loop */
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62 for (iz = 0; iz < iy; iz++) {
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63 _W += ((mp_word)*tmpx++)*((mp_word)*tmpy--);
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64 }
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65
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66 /* store term */
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67 W[ix] = ((mp_digit)_W) & MP_MASK;
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68
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69 /* make next carry */
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70 _W = _W >> ((mp_word)DIGIT_BIT);
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71 }
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72
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73 /* setup dest */
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74 olduse = c->used;
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75 c->used = pa;
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76
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77 {
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78 register mp_digit *tmpc;
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79
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80 tmpc = c->dp + digs;
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81 for (ix = digs; ix < pa; ix++) {
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82 /* now extract the previous digit [below the carry] */
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83 *tmpc++ = W[ix];
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84 }
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85
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86 /* clear unused digits [that existed in the old copy of c] */
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87 for (; ix < olduse; ix++) {
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88 *tmpc++ = 0;
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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 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 mp_clamp (c);
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 return MP_OKAY;
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94 #endif
389
5ff8218bcee9 propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)
Matt Johnston <matt@ucc.asn.au>
parents: 284
diff changeset
95
5ff8218bcee9 propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)
Matt Johnston <matt@ucc.asn.au>
parents: 284
diff changeset
96 /* $Source: /cvs/libtom/libtommath/bn_fast_s_mp_mul_high_digs.c,v $ */
5ff8218bcee9 propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)
Matt Johnston <matt@ucc.asn.au>
parents: 284
diff changeset
97 /* $Revision: 1.5 $ */
5ff8218bcee9 propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)
Matt Johnston <matt@ucc.asn.au>
parents: 284
diff changeset
98 /* $Date: 2006/11/14 03:46:25 $ */