Mercurial > dropbear
annotate libtommath/bn_s_mp_mul_digs.c @ 1723:5386011b740d
Disable toom and karatsuba for new libtommath
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 18 Jun 2020 19:12:07 +0800 |
parents | 1051e4eea25a |
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1 #include "tommath_private.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 /* SPDX-License-Identifier: Unlicense */ |
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5 |
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6 /* multiplies |a| * |b| and only computes upto digs digits of result |
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7 * HAC pp. 595, Algorithm 14.12 Modified so you can control how |
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8 * many digits of output are created. |
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9 */ |
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10 mp_err s_mp_mul_digs(const mp_int *a, const mp_int *b, mp_int *c, int digs) |
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11 { |
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12 mp_int t; |
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13 mp_err err; |
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14 int pa, pb, ix, iy; |
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15 mp_digit u; |
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16 mp_word r; |
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17 mp_digit tmpx, *tmpt, *tmpy; |
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18 |
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19 /* can we use the fast multiplier? */ |
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20 if ((digs < MP_WARRAY) && |
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21 (MP_MIN(a->used, b->used) < MP_MAXFAST)) { |
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22 return s_mp_mul_digs_fast(a, b, c, digs); |
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23 } |
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24 |
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25 if ((err = mp_init_size(&t, digs)) != MP_OKAY) { |
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26 return err; |
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27 } |
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28 t.used = digs; |
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29 |
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30 /* compute the digits of the product directly */ |
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31 pa = a->used; |
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32 for (ix = 0; ix < pa; ix++) { |
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33 /* set the carry to zero */ |
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34 u = 0; |
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35 |
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36 /* limit ourselves to making digs digits of output */ |
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37 pb = MP_MIN(b->used, digs - ix); |
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38 |
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39 /* setup some aliases */ |
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40 /* copy of the digit from a used within the nested loop */ |
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41 tmpx = a->dp[ix]; |
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42 |
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43 /* an alias for the destination shifted ix places */ |
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44 tmpt = t.dp + ix; |
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45 |
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46 /* an alias for the digits of b */ |
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47 tmpy = b->dp; |
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48 |
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49 /* compute the columns of the output and propagate the carry */ |
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50 for (iy = 0; iy < pb; iy++) { |
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51 /* compute the column as a mp_word */ |
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52 r = (mp_word)*tmpt + |
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53 ((mp_word)tmpx * (mp_word)*tmpy++) + |
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54 (mp_word)u; |
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55 |
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56 /* the new column is the lower part of the result */ |
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57 *tmpt++ = (mp_digit)(r & (mp_word)MP_MASK); |
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58 |
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59 /* get the carry word from the result */ |
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60 u = (mp_digit)(r >> (mp_word)MP_DIGIT_BIT); |
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61 } |
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62 /* set carry if it is placed below digs */ |
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63 if ((ix + iy) < digs) { |
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64 *tmpt = u; |
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65 } |
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66 } |
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67 |
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68 mp_clamp(&t); |
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69 mp_exch(&t, c); |
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70 |
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71 mp_clear(&t); |
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72 return MP_OKAY; |
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73 } |
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74 #endif |