Mercurial > dropbear

annotate libtommath/bn_mp_reduce.c @ 1477:533e070b3126

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Remove none cipher
author Matt Johnston <matt@ucc.asn.au>
date Fri, 09 Feb 2018 23:40:23 +0800
parents 8bba51a55704
children f52919ffd3b1
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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60fc6476e044 Update to libtommath v1.0
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parents: 389
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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diff changeset
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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Matt Johnston <matt@ucc.asn.au>
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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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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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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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parents:
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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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diff changeset
66 if ((res = s_mp_mul_digs (&q, m, &q, um + 1)) != MP_OKAY) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
67 goto CLEANUP;
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parents:
diff changeset
68 }
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parents:
diff changeset
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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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
72 goto CLEANUP;
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parents:
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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parents:
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:
diff changeset
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:
diff changeset
81 goto CLEANUP;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
82 }
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parents:
diff changeset
83
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
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:
diff changeset
87 goto CLEANUP;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
88 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
89 }
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parents: 389
diff changeset
90
284
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parents:
diff changeset
91 CLEANUP:
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 mp_clear (&q);
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94 return res;
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96 #endif
389
5ff8218bcee9 propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)
Matt Johnston <matt@ucc.asn.au>
parents: 284
diff changeset
97
1470
8bba51a55704 Update to libtommath v1.0.1
Matt Johnston <matt@ucc.asn.au>
parents: 1436
diff changeset
98 /* ref: $Format:%D$ */
8bba51a55704 Update to libtommath v1.0.1
Matt Johnston <matt@ucc.asn.au>
parents: 1436
diff changeset
99 /* git commit: $Format:%H$ */
8bba51a55704 Update to libtommath v1.0.1
Matt Johnston <matt@ucc.asn.au>
parents: 1436
diff changeset
100 /* commit time: $Format:%ai$ */