Mercurial > dropbear

annotate libtommath/bn_mp_dr_is_modulus.c @ 1885:5d8dbb6fdab7

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Fix SSH_PUBKEYINFO, limit characters, add tests We fix a bad_bufptr() failure from a previous commit. We now limit the allowed characters to those that will definitely be safe in a shell. Some scripts/programs may use arbitrary environment variables without escaping correctly - that could be a problem in a restricted environment. The current allowed set is a-z A-Z 0-9 .,_-+@ This also adds a test for SSH_PUBKEYINFO, by default it only runs under github actions (or "act -j build").
author Matt Johnston <matt@ucc.asn.au>
date Wed, 16 Mar 2022 17:17:23 +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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parents: 1470
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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