Mercurial > dropbear
annotate libtommath/bn_mp_div_d.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_MP_DIV_D_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 /* single digit division (based on routine from MPI) */ |
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7 mp_err mp_div_d(const mp_int *a, mp_digit b, mp_int *c, mp_digit *d) |
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8 { |
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9 mp_int q; |
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10 mp_word w; |
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11 mp_digit t; |
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12 mp_err err; |
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13 int ix; |
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14 |
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15 /* cannot divide by zero */ |
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16 if (b == 0u) { |
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17 return MP_VAL; |
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18 } |
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19 |
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20 /* quick outs */ |
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21 if ((b == 1u) || MP_IS_ZERO(a)) { |
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22 if (d != NULL) { |
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23 *d = 0; |
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24 } |
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25 if (c != NULL) { |
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26 return mp_copy(a, c); |
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27 } |
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28 return MP_OKAY; |
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29 } |
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30 |
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31 /* power of two ? */ |
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32 if ((b & (b - 1u)) == 0u) { |
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33 ix = 1; |
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34 while ((ix < MP_DIGIT_BIT) && (b != (((mp_digit)1)<<ix))) { |
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35 ix++; |
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36 } |
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37 if (d != NULL) { |
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38 *d = a->dp[0] & (((mp_digit)1<<(mp_digit)ix) - 1uL); |
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39 } |
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40 if (c != NULL) { |
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41 return mp_div_2d(a, ix, c, NULL); |
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42 } |
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43 return MP_OKAY; |
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44 } |
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45 |
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46 /* three? */ |
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47 if (MP_HAS(MP_DIV_3) && (b == 3u)) { |
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48 return mp_div_3(a, c, d); |
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49 } |
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50 |
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51 /* no easy answer [c'est la vie]. Just division */ |
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52 if ((err = mp_init_size(&q, a->used)) != MP_OKAY) { |
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53 return err; |
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54 } |
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55 |
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56 q.used = a->used; |
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57 q.sign = a->sign; |
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58 w = 0; |
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59 for (ix = a->used - 1; ix >= 0; ix--) { |
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60 w = (w << (mp_word)MP_DIGIT_BIT) | (mp_word)a->dp[ix]; |
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61 |
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62 if (w >= b) { |
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63 t = (mp_digit)(w / b); |
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64 w -= (mp_word)t * (mp_word)b; |
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65 } else { |
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66 t = 0; |
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67 } |
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68 q.dp[ix] = t; |
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69 } |
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70 |
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71 if (d != NULL) { |
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72 *d = (mp_digit)w; |
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73 } |
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74 |
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75 if (c != NULL) { |
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76 mp_clamp(&q); |
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77 mp_exch(&q, c); |
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78 } |
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79 mp_clear(&q); |
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80 |
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81 return err; |
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82 } |
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83 |
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84 #endif |