Mercurial > dropbear

annotate libtommath/bn_fast_s_mp_mul_high_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:
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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
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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 $ */