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annotate libtommath/bn_mp_is_square.c @ 1659:d32bcb5c557d

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Add Ed25519 support (#91) * Add support for Ed25519 as a public key type Ed25519 is a elliptic curve signature scheme that offers better security than ECDSA and DSA and good performance. It may be used for both user and host keys. OpenSSH key import and fuzzer are not supported yet. Initially inspired by Peter Szabo. * Add curve25519 and ed25519 fuzzers * Add import and export of Ed25519 keys
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Wed, 11 Mar 2020 21:09:45 +0500
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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parents: 1470
diff changeset
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,
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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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) {
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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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) {
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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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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parents: 1470
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76 }
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Steffen Jaeckel <s_jaeckel@gmx.de>
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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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Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
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80 * is already equal to MP_OKAY from the mp_mod call
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
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81 */
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Steffen Jaeckel <s_jaeckel@gmx.de>
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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>
parents: 1470
diff changeset
84 if (((1uL<<(r%17uL)) & 0x5CE8uL) != 0uL) 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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85 if (((1uL<<(r%19uL)) & 0x4F50CuL) != 0uL) 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
diff changeset
86 if (((1uL<<(r%23uL)) & 0x7ACCA0uL) != 0uL) 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
diff changeset
87 if (((1uL<<(r%29uL)) & 0xC2EDD0CuL) != 0uL) 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
diff changeset
88 if (((1uL<<(r%31uL)) & 0x6DE2B848uL) != 0uL) goto LBL_ERR;
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parents:
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89
1655
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
diff changeset
90 /* Final check - is sqr(sqrt(arg)) == arg ? */
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
91 if ((res = mp_sqrt(arg, &t)) != MP_OKAY) {
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parents: 1470
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92 goto LBL_ERR;
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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
diff changeset
95 goto LBL_ERR;
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parents: 1470
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96 }
284
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parents:
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97
1655
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parents: 1470
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98 *ret = (mp_cmp_mag(&t, arg) == MP_EQ) ? MP_YES : MP_NO;
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parents: 1470
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99 LBL_ERR:
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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 }
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parents:
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103 #endif
389
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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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106 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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parents: 1470
diff changeset
107 /* commit time: 2019-01-28 20:32:32 +0100 */