annotate libtommath/bn_mp_reduce_is_2k_l.c @ 1861:2b3a8026a6ce

Add re-exec for server This allows ASLR to re-randomize the address space for every connection, preventing some vulnerabilities from being exploitable by repeated probing. Overhead (memory and time) is yet to be confirmed. At present this is only enabled on Linux. Other BSD platforms with fexecve() would probably also work though have not been tested.
author Matt Johnston <matt@ucc.asn.au>
date Sun, 30 Jan 2022 10:14:56 +0800
parents 1051e4eea25a
children
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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_REDUCE_IS_2K_L_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 reduce_2k_l can be used */
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7 mp_bool mp_reduce_is_2k_l(const mp_int *a)
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8 {
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9 int ix, iy;
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10
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11 if (a->used == 0) {
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12 return MP_NO;
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13 } else if (a->used == 1) {
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14 return MP_YES;
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15 } else if (a->used > 1) {
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16 /* if more than half of the digits are -1 we're sold */
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17 for (iy = ix = 0; ix < a->used; ix++) {
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18 if (a->dp[ix] == MP_DIGIT_MAX) {
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19 ++iy;
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20 }
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21 }
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22 return (iy >= (a->used/2)) ? MP_YES : MP_NO;
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23 } else {
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24 return MP_NO;
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25 }
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26 }
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28 #endif