annotate libtommath/bn_mp_is_square.c @ 1663:c795520269f9

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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1 #include "tommath_private.h"
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2 #ifdef BN_MP_IS_SQUARE_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 /* Check if remainders are possible squares - fast exclude non-squares */
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16 static const char rem_128[128] = {
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17 0, 0, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1,
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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18 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1,
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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19 1, 0, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1,
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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20 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1,
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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21 0, 0, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1,
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22 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1,
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23 1, 0, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1,
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24 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1
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25 };
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26
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27 static const char rem_105[105] = {
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28 0, 0, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1,
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29 0, 0, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1,
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30 0, 1, 1, 1, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1,
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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31 1, 0, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1,
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32 0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1,
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33 1, 1, 1, 1, 0, 1, 0, 1, 1, 0, 0, 1, 1, 1, 1,
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34 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1
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35 };
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36
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37 /* Store non-zero to ret if arg is square, and zero if not */
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38 int mp_is_square(const mp_int *arg, int *ret)
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39 {
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40 int res;
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41 mp_digit c;
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42 mp_int t;
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43 unsigned long r;
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44
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45 /* Default to Non-square :) */
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46 *ret = MP_NO;
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47
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48 if (arg->sign == MP_NEG) {
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49 return MP_VAL;
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50 }
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51
1655
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52 /* digits used? (TSD) */
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53 if (arg->used == 0) {
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54 return MP_OKAY;
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55 }
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56
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57 /* First check mod 128 (suppose that DIGIT_BIT is at least 7) */
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58 if (rem_128[127u & DIGIT(arg, 0)] == (char)1) {
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59 return MP_OKAY;
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60 }
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61
1655
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62 /* Next check mod 105 (3*5*7) */
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63 if ((res = mp_mod_d(arg, 105uL, &c)) != MP_OKAY) {
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64 return res;
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65 }
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66 if (rem_105[c] == (char)1) {
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67 return MP_OKAY;
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68 }
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69
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70
1655
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diff changeset
71 if ((res = mp_init_set_int(&t, 11L*13L*17L*19L*23L*29L*31L)) != MP_OKAY) {
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72 return res;
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73 }
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Steffen Jaeckel <s_jaeckel@gmx.de>
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74 if ((res = mp_mod(arg, &t, &t)) != MP_OKAY) {
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75 goto LBL_ERR;
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76 }
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77 r = mp_get_int(&t);
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78 /* Check for other prime modules, note it's not an ERROR but we must
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79 * free "t" so the easiest way is to goto LBL_ERR. We know that res
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80 * is already equal to MP_OKAY from the mp_mod call
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81 */
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82 if (((1uL<<(r%11uL)) & 0x5C4uL) != 0uL) goto LBL_ERR;
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Steffen Jaeckel <s_jaeckel@gmx.de>
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83 if (((1uL<<(r%13uL)) & 0x9E4uL) != 0uL) goto LBL_ERR;
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Steffen Jaeckel <s_jaeckel@gmx.de>
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84 if (((1uL<<(r%17uL)) & 0x5CE8uL) != 0uL) goto LBL_ERR;
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Steffen Jaeckel <s_jaeckel@gmx.de>
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85 if (((1uL<<(r%19uL)) & 0x4F50CuL) != 0uL) goto LBL_ERR;
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
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86 if (((1uL<<(r%23uL)) & 0x7ACCA0uL) != 0uL) goto LBL_ERR;
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
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87 if (((1uL<<(r%29uL)) & 0xC2EDD0CuL) != 0uL) goto LBL_ERR;
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
diff changeset
88 if (((1uL<<(r%31uL)) & 0x6DE2B848uL) != 0uL) goto LBL_ERR;
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89
1655
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diff changeset
90 /* Final check - is sqr(sqrt(arg)) == arg ? */
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diff changeset
91 if ((res = mp_sqrt(arg, &t)) != MP_OKAY) {
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parents: 1470
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92 goto LBL_ERR;
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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93 }
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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94 if ((res = mp_sqr(&t, &t)) != 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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95 goto LBL_ERR;
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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96 }
284
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parents:
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97
1655
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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98 *ret = (mp_cmp_mag(&t, arg) == MP_EQ) ? MP_YES : MP_NO;
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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99 LBL_ERR:
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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100 mp_clear(&t);
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parents: 1470
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101 return res;
284
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parents:
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102 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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103 #endif
389
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parents: 284
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104
1655
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parents: 1470
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105 /* ref: HEAD -> master, tag: v1.1.0 */
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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106 /* 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
107 /* commit time: 2019-01-28 20:32:32 +0100 */