Mercurial > dropbear

annotate libtommath/bn_fast_s_mp_mul_digs.c @ 1156:a8f4dade70e5

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avoid getpass when not used some systems (like android's bionic) do not provide getpass. you can disable ENABLE_CLI_PASSWORD_AUTH & ENABLE_CLI_INTERACT_AUTH to avoid its use (and rely on pubkey auth), but the link still fails because the support file calls getpass. do not define this func if both of those auth methods are not used.
author Mike Frysinger <vapier@gentoo.org>
date Wed, 21 Oct 2015 22:39:55 +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_FAST_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 *
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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 /* Fast (comba) multiplier
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19 *
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20 * This is the fast column-array [comba] multiplier. It is
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21 * designed to compute the columns of the product first
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22 * then handle the carries afterwards. This has the effect
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23 * of making the nested loops that compute the columns very
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24 * simple and schedulable on super-scalar processors.
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25 *
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26 * This has been modified to produce a variable number of
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27 * digits of output so if say only a half-product is required
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28 * you don't have to compute the upper half (a feature
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29 * required for fast Barrett reduction).
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30 *
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31 * Based on Algorithm 14.12 on pp.595 of HAC.
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32 *
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33 */
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34 int fast_s_mp_mul_digs (mp_int * a, mp_int * b, mp_int * c, int digs)
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35 {
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36 int olduse, res, pa, ix, iz;
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37 mp_digit W[MP_WARRAY];
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38 register mp_word _W;
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39
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40 /* grow the destination as required */
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41 if (c->alloc < digs) {
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42 if ((res = mp_grow (c, digs)) != MP_OKAY) {
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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 /* number of output digits to produce */
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48 pa = MIN(digs, a->used + b->used);
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49
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50 /* clear the carry */
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51 _W = 0;
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52 for (ix = 0; ix < pa; ix++) {
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53 int tx, ty;
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54 int iy;
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55 mp_digit *tmpx, *tmpy;
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56
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57 /* get offsets into the two bignums */
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58 ty = MIN(b->used-1, ix);
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59 tx = ix - ty;
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60
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61 /* setup temp aliases */
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62 tmpx = a->dp + tx;
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63 tmpy = b->dp + ty;
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64
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65 /* this is the number of times the loop will iterrate, essentially
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66 while (tx++ < a->used && ty-- >= 0) { ... }
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67 */
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68 iy = MIN(a->used-tx, ty+1);
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69
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70 /* execute loop */
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71 for (iz = 0; iz < iy; ++iz) {
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72 _W += ((mp_word)*tmpx++)*((mp_word)*tmpy--);
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73
284
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74 }
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75
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76 /* store term */
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77 W[ix] = ((mp_digit)_W) & MP_MASK;
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78
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79 /* make next carry */
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80 _W = _W >> ((mp_word)DIGIT_BIT);
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81 }
284
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82
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83 /* setup dest */
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84 olduse = c->used;
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85 c->used = pa;
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86
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87 {
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88 register mp_digit *tmpc;
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89 tmpc = c->dp;
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90 for (ix = 0; ix < pa+1; ix++) {
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 /* now extract the previous digit [below the carry] */
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 *tmpc++ = W[ix];
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
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95 /* clear unused digits [that existed in the old copy of c] */
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96 for (; ix < olduse; ix++) {
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97 *tmpc++ = 0;
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
98 }
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 mp_clamp (c);
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
101 return MP_OKAY;
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
102 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
103 #endif
389
5ff8218bcee9 propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)
Matt Johnston <matt@ucc.asn.au>
parents: 284
diff changeset
104
5ff8218bcee9 propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)
Matt Johnston <matt@ucc.asn.au>
parents: 284
diff changeset
105 /* $Source: /cvs/libtom/libtommath/bn_fast_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
106 /* $Revision: 1.7 $ */
5ff8218bcee9 propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)
Matt Johnston <matt@ucc.asn.au>
parents: 284
diff changeset
107 /* $Date: 2006/03/31 14:18:44 $ */