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annotate libtommath/bn_mp_gcd.c @ 1663:c795520269f9

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Fallback for key gen without hard link support (#89) Add a non-atomic fallback for key generation on platforms where link() is not permitted (such as most stock Android installs) or on filesystems without hard link support (such as FAT).
author Matt Robinson <git@nerdoftheherd.com>
date Sat, 14 Mar 2020 14:37:35 +0000
parents f52919ffd3b1
children 1051e4eea25a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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diff changeset
1 #include "tommath_private.h"
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2 #ifdef BN_MP_GCD_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 * SPDX-License-Identifier: Unlicense
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13 */
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14
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15 /* Greatest Common Divisor using the binary method */
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f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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16 int mp_gcd(const mp_int *a, const mp_int *b, mp_int *c)
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17 {
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f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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18 mp_int u, v;
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19 int k, u_lsb, v_lsb, res;
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20
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21 /* either zero than gcd is the largest */
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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22 if (mp_iszero(a) == MP_YES) {
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23 return mp_abs(b, c);
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24 }
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25 if (mp_iszero(b) == MP_YES) {
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26 return mp_abs(a, c);
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27 }
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28
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29 /* get copies of a and b we can modify */
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30 if ((res = mp_init_copy(&u, a)) != MP_OKAY) {
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31 return res;
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32 }
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33
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34 if ((res = mp_init_copy(&v, b)) != MP_OKAY) {
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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35 goto LBL_U;
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36 }
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37
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38 /* must be positive for the remainder of the algorithm */
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39 u.sign = v.sign = MP_ZPOS;
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40
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41 /* B1. Find the common power of two for u and v */
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42 u_lsb = mp_cnt_lsb(&u);
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43 v_lsb = mp_cnt_lsb(&v);
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44 k = MIN(u_lsb, v_lsb);
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45
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46 if (k > 0) {
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47 /* divide the power of two out */
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48 if ((res = mp_div_2d(&u, k, &u, NULL)) != MP_OKAY) {
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49 goto LBL_V;
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50 }
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51
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52 if ((res = mp_div_2d(&v, k, &v, NULL)) != MP_OKAY) {
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53 goto LBL_V;
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54 }
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55 }
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56
1655
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57 /* divide any remaining factors of two out */
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58 if (u_lsb != k) {
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59 if ((res = mp_div_2d(&u, u_lsb - k, &u, NULL)) != MP_OKAY) {
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60 goto LBL_V;
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61 }
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62 }
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63
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64 if (v_lsb != k) {
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65 if ((res = mp_div_2d(&v, v_lsb - k, &v, NULL)) != MP_OKAY) {
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66 goto LBL_V;
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67 }
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68 }
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69
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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70 while (mp_iszero(&v) == MP_NO) {
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71 /* make sure v is the largest */
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72 if (mp_cmp_mag(&u, &v) == MP_GT) {
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73 /* swap u and v to make sure v is >= u */
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74 mp_exch(&u, &v);
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75 }
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76
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77 /* subtract smallest from largest */
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78 if ((res = s_mp_sub(&v, &u, &v)) != MP_OKAY) {
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79 goto LBL_V;
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parents: 1470
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80 }
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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parents: 1470
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81
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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82 /* Divide out all factors of two */
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parents: 1470
diff changeset
83 if ((res = mp_div_2d(&v, mp_cnt_lsb(&v), &v, NULL)) != MP_OKAY) {
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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parents: 1470
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84 goto LBL_V;
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parents: 1470
diff changeset
85 }
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
diff changeset
86 }
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87
1655
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88 /* multiply by 2**k which we divided out at the beginning */
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parents: 1470
diff changeset
89 if ((res = mp_mul_2d(&u, k, c)) != MP_OKAY) {
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
diff changeset
90 goto LBL_V;
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
diff changeset
91 }
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
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92 c->sign = MP_ZPOS;
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parents: 1470
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93 res = MP_OKAY;
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parents: 1470
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94 LBL_V:
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parents: 1470
diff changeset
95 mp_clear(&u);
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parents: 1470
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96 LBL_U:
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97 mp_clear(&v);
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parents: 1470
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98 return res;
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99 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
100 #endif
389
5ff8218bcee9 propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)
Matt Johnston <matt@ucc.asn.au>
parents: 284
diff changeset
101
1655
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
diff changeset
102 /* ref: HEAD -> master, tag: v1.1.0 */
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
diff changeset
103 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
diff changeset
104 /* commit time: 2019-01-28 20:32:32 +0100 */