annotate libtommath/bn_mp_reduce.c @ 1450:5b25d86b865b fuzz

check dss g range
author Matt Johnston <matt@ucc.asn.au>
date Mon, 14 Aug 2017 00:00:10 +0800
parents 60fc6476e044
children 8bba51a55704
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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diff changeset
1 #include <tommath_private.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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diff changeset
14 *
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15 * Tom St Denis, [email protected], http://libtom.org
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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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diff changeset
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 (((mp_digit) 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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diff changeset
49 #else
60fc6476e044 Update to libtommath v1.0
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50 {
284
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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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diff changeset
57 /* q3 = q2 / b**(k+1) */
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58 mp_rshd (&q, um + 1);
284
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59
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diff changeset
60 /* x = x mod b**(k+1), quick (no division) */
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diff changeset
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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parents:
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67 goto CLEANUP;
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68 }
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parents:
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69
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parents:
diff changeset
70 /* x = x - q */
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parents:
diff changeset
71 if ((res = mp_sub (x, &q, x)) != MP_OKAY) {
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parents:
diff changeset
72 goto CLEANUP;
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diff changeset
73 }
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parents:
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74
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parents:
diff changeset
75 /* If x < 0, add b**(k+1) to it */
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diff changeset
76 if (mp_cmp_d (x, 0) == MP_LT) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
77 mp_set (&q, 1);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
78 if ((res = mp_lshd (&q, um + 1)) != MP_OKAY)
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Matt Johnston <matt@ucc.asn.au>
parents:
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79 goto CLEANUP;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
80 if ((res = mp_add (x, &q, x)) != MP_OKAY)
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Matt Johnston <matt@ucc.asn.au>
parents:
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81 goto CLEANUP;
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parents:
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82 }
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parents:
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83
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
84 /* Back off if it's too big */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
85 while (mp_cmp (x, m) != MP_LT) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
86 if ((res = s_mp_sub (x, m, x)) != MP_OKAY) {
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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87 goto CLEANUP;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
88 }
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Matt Johnston <matt@ucc.asn.au>
parents:
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89 }
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parents: 389
diff changeset
90
284
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parents:
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91 CLEANUP:
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 mp_clear (&q);
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Matt Johnston <matt@ucc.asn.au>
parents:
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93
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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94 return res;
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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95 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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96 #endif
389
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parents: 284
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97
1436
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parents: 389
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98 /* $Source$ */
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parents: 389
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99 /* $Revision$ */
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parents: 389
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100 /* $Date$ */