Mercurial > dropbear
annotate libtommath/bn_mp_reduce.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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284
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1 #include <tommath.h> |
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2 #ifdef BN_MP_REDUCE_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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284
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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 /* reduces x mod m, assumes 0 < x < m**2, mu is |
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19 * precomputed via mp_reduce_setup. |
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20 * From HAC pp.604 Algorithm 14.42 |
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21 */ |
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22 int mp_reduce (mp_int * x, mp_int * m, mp_int * mu) |
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23 { |
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24 mp_int q; |
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25 int res, um = m->used; |
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26 |
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27 /* q = x */ |
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28 if ((res = mp_init_copy (&q, x)) != MP_OKAY) { |
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29 return res; |
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30 } |
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31 |
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32 /* q1 = x / b**(k-1) */ |
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33 mp_rshd (&q, um - 1); |
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34 |
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35 /* according to HAC this optimization is ok */ |
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36 if (((unsigned long) um) > (((mp_digit)1) << (DIGIT_BIT - 1))) { |
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37 if ((res = mp_mul (&q, mu, &q)) != MP_OKAY) { |
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38 goto CLEANUP; |
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39 } |
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40 } else { |
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41 #ifdef BN_S_MP_MUL_HIGH_DIGS_C |
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42 if ((res = s_mp_mul_high_digs (&q, mu, &q, um)) != MP_OKAY) { |
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43 goto CLEANUP; |
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44 } |
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45 #elif defined(BN_FAST_S_MP_MUL_HIGH_DIGS_C) |
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46 if ((res = fast_s_mp_mul_high_digs (&q, mu, &q, um)) != MP_OKAY) { |
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47 goto CLEANUP; |
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48 } |
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49 #else |
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50 { |
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51 res = MP_VAL; |
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52 goto CLEANUP; |
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53 } |
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54 #endif |
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55 } |
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56 |
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57 /* q3 = q2 / b**(k+1) */ |
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58 mp_rshd (&q, um + 1); |
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59 |
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60 /* x = x mod b**(k+1), quick (no division) */ |
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61 if ((res = mp_mod_2d (x, DIGIT_BIT * (um + 1), x)) != MP_OKAY) { |
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62 goto CLEANUP; |
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63 } |
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64 |
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65 /* q = q * m mod b**(k+1), quick (no division) */ |
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66 if ((res = s_mp_mul_digs (&q, m, &q, um + 1)) != MP_OKAY) { |
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67 goto CLEANUP; |
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68 } |
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69 |
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70 /* x = x - q */ |
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71 if ((res = mp_sub (x, &q, x)) != MP_OKAY) { |
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72 goto CLEANUP; |
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73 } |
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74 |
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75 /* If x < 0, add b**(k+1) to it */ |
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76 if (mp_cmp_d (x, 0) == MP_LT) { |
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77 mp_set (&q, 1); |
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78 if ((res = mp_lshd (&q, um + 1)) != MP_OKAY) |
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79 goto CLEANUP; |
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80 if ((res = mp_add (x, &q, x)) != MP_OKAY) |
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81 goto CLEANUP; |
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82 } |
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83 |
eed26cff980b
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84 /* Back off if it's too big */ |
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85 while (mp_cmp (x, m) != MP_LT) { |
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86 if ((res = s_mp_sub (x, m, x)) != MP_OKAY) { |
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parents:
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87 goto CLEANUP; |
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parents:
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88 } |
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parents:
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89 } |
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Matt Johnston <matt@ucc.asn.au>
parents:
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90 |
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parents:
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91 CLEANUP: |
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92 mp_clear (&q); |
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parents:
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93 |
eed26cff980b
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parents:
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94 return res; |
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parents:
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95 } |
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96 #endif |
389
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parents:
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diff
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97 |
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98 /* $Source: /cvs/libtom/libtommath/bn_mp_reduce.c,v $ */ |
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99 /* $Revision: 1.3 $ */ |
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100 /* $Date: 2006/03/31 14:18:44 $ */ |