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annotate libtommath/bn_fast_s_mp_mul_digs.c @ 1670:aeda68938596
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author | jcmathews <jesselcmathews@yahoo.co.in> |
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date | Mon, 25 May 2020 18:32:59 +0530 |
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1 #include "tommath_private.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 * SPDX-License-Identifier: Unlicense |
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13 */ |
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14 |
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15 /* Fast (comba) multiplier |
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16 * |
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17 * This is the fast column-array [comba] multiplier. It is |
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18 * designed to compute the columns of the product first |
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19 * then handle the carries afterwards. This has the effect |
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20 * of making the nested loops that compute the columns very |
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21 * simple and schedulable on super-scalar processors. |
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22 * |
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23 * This has been modified to produce a variable number of |
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24 * digits of output so if say only a half-product is required |
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25 * you don't have to compute the upper half (a feature |
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26 * required for fast Barrett reduction). |
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27 * |
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28 * Based on Algorithm 14.12 on pp.595 of HAC. |
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29 * |
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30 */ |
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31 int fast_s_mp_mul_digs(const mp_int *a, const mp_int *b, mp_int *c, int digs) |
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32 { |
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33 int olduse, res, pa, ix, iz; |
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34 mp_digit W[MP_WARRAY]; |
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35 mp_word _W; |
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36 |
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37 /* grow the destination as required */ |
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38 if (c->alloc < digs) { |
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39 if ((res = mp_grow(c, digs)) != MP_OKAY) { |
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40 return res; |
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41 } |
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42 } |
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43 |
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44 /* number of output digits to produce */ |
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45 pa = MIN(digs, a->used + b->used); |
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46 |
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47 /* clear the carry */ |
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48 _W = 0; |
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49 for (ix = 0; ix < pa; ix++) { |
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50 int tx, ty; |
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51 int iy; |
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52 mp_digit *tmpx, *tmpy; |
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53 |
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54 /* get offsets into the two bignums */ |
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55 ty = MIN(b->used-1, ix); |
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56 tx = ix - ty; |
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57 |
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58 /* setup temp aliases */ |
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59 tmpx = a->dp + tx; |
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60 tmpy = b->dp + ty; |
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61 |
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62 /* this is the number of times the loop will iterrate, essentially |
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63 while (tx++ < a->used && ty-- >= 0) { ... } |
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64 */ |
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65 iy = MIN(a->used-tx, ty+1); |
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66 |
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67 /* execute loop */ |
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68 for (iz = 0; iz < iy; ++iz) { |
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69 _W += (mp_word)*tmpx++ * (mp_word)*tmpy--; |
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70 |
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71 } |
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72 |
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73 /* store term */ |
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74 W[ix] = (mp_digit)_W & MP_MASK; |
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75 |
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76 /* make next carry */ |
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77 _W = _W >> (mp_word)DIGIT_BIT; |
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78 } |
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79 |
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80 /* setup dest */ |
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81 olduse = c->used; |
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82 c->used = pa; |
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83 |
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84 { |
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85 mp_digit *tmpc; |
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86 tmpc = c->dp; |
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87 for (ix = 0; ix < pa; ix++) { |
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88 /* now extract the previous digit [below the carry] */ |
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89 *tmpc++ = W[ix]; |
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90 } |
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91 |
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92 /* clear unused digits [that existed in the old copy of c] */ |
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93 for (; ix < olduse; ix++) { |
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94 *tmpc++ = 0; |
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95 } |
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96 } |
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97 mp_clamp(c); |
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98 return MP_OKAY; |
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99 } |
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100 #endif |
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101 |
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102 /* ref: HEAD -> master, tag: v1.1.0 */ |
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103 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */ |
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104 /* commit time: 2019-01-28 20:32:32 +0100 */ |