Mercurial > dropbear

annotate libtommath/bn_mp_dr_is_modulus.c @ 1754:064f5be2fc45

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Add buf_decrpos()
author Matt Johnston <matt@ucc.asn.au>
date Sat, 24 Oct 2020 18:56:45 +0800
parents 1051e4eea25a
children
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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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1 #include "tommath_private.h"
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2 #ifdef BN_MP_DR_IS_MODULUS_C
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis */
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4 /* SPDX-License-Identifier: Unlicense */
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6 /* determines if a number is a valid DR modulus */
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7 mp_bool mp_dr_is_modulus(const mp_int *a)
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8 {
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9 int ix;
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11 /* must be at least two digits */
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12 if (a->used < 2) {
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13 return MP_NO;
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14 }
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16 /* must be of the form b**k - a [a <= b] so all
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17 * but the first digit must be equal to -1 (mod b).
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18 */
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19 for (ix = 1; ix < a->used; ix++) {
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20 if (a->dp[ix] != MP_MASK) {
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21 return MP_NO;
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parents: 1470
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22 }
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23 }
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24 return MP_YES;
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25 }
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27 #endif