Mercurial > dropbear

annotate libtommath/bn_s_mp_mul_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_S_MP_MUL_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 *
389
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15 * Tom St Denis, [email protected], http://math.libtomcrypt.com
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16 */
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17
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18 /* multiplies |a| * |b| and only computes upto digs digits of result
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19 * HAC pp. 595, Algorithm 14.12 Modified so you can control how
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20 * many digits of output are created.
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21 */
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22 int s_mp_mul_digs (mp_int * a, mp_int * b, mp_int * c, int digs)
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23 {
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24 mp_int t;
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25 int res, pa, pb, ix, iy;
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26 mp_digit u;
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27 mp_word r;
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28 mp_digit tmpx, *tmpt, *tmpy;
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29
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30 /* can we use the fast multiplier? */
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31 if (((digs) < MP_WARRAY) &&
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32 MIN (a->used, b->used) <
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33 (1 << ((CHAR_BIT * sizeof (mp_word)) - (2 * DIGIT_BIT)))) {
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34 return fast_s_mp_mul_digs (a, b, c, digs);
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35 }
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36
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37 if ((res = mp_init_size (&t, digs)) != MP_OKAY) {
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38 return res;
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39 }
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40 t.used = digs;
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41
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42 /* compute the digits of the product directly */
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43 pa = a->used;
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44 for (ix = 0; ix < pa; ix++) {
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45 /* set the carry to zero */
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46 u = 0;
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47
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48 /* limit ourselves to making digs digits of output */
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49 pb = MIN (b->used, digs - ix);
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50
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51 /* setup some aliases */
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52 /* copy of the digit from a used within the nested loop */
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53 tmpx = a->dp[ix];
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54
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55 /* an alias for the destination shifted ix places */
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56 tmpt = t.dp + ix;
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57
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58 /* an alias for the digits of b */
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59 tmpy = b->dp;
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60
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61 /* compute the columns of the output and propagate the carry */
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62 for (iy = 0; iy < pb; iy++) {
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63 /* compute the column as a mp_word */
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64 r = ((mp_word)*tmpt) +
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65 ((mp_word)tmpx) * ((mp_word)*tmpy++) +
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66 ((mp_word) u);
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67
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68 /* the new column is the lower part of the result */
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69 *tmpt++ = (mp_digit) (r & ((mp_word) MP_MASK));
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70
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71 /* get the carry word from the result */
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72 u = (mp_digit) (r >> ((mp_word) DIGIT_BIT));
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73 }
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74 /* set carry if it is placed below digs */
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75 if (ix + iy < digs) {
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76 *tmpt = u;
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77 }
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78 }
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79
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80 mp_clamp (&t);
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81 mp_exch (&t, c);
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82
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83 mp_clear (&t);
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84 return MP_OKAY;
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85 }
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86 #endif
389
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87
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88 /* $Source: /cvs/libtom/libtommath/bn_s_mp_mul_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
89 /* $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
90 /* $Date: 2006/03/31 14:18:44 $ */