Mercurial > dropbear
annotate libtommath/bn_fast_s_mp_mul_high_digs.c @ 1156:a8f4dade70e5
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> |
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date | Wed, 21 Oct 2015 22:39:55 +0800 |
parents | 5ff8218bcee9 |
children | 60fc6476e044 |
rev | line source |
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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 * |
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 /* 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 } |
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90 } |
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91 mp_clamp (c); |
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92 return MP_OKAY; |
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93 } |
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94 #endif |
389
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95 |
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96 /* $Source: /cvs/libtom/libtommath/bn_fast_s_mp_mul_high_digs.c,v $ */ |
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97 /* $Revision: 1.5 $ */ |
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98 /* $Date: 2006/11/14 03:46:25 $ */ |