Mercurial > dropbear

annotate libtommath/bn_mp_sqr.c @ 1861:2b3a8026a6ce

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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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1655
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_SQR_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 /* computes b = a*a */
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7 mp_err mp_sqr(const mp_int *a, mp_int *b)
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8 {
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9 mp_err err;
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10 if (MP_HAS(S_MP_TOOM_SQR) && /* use Toom-Cook? */
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11 (a->used >= MP_TOOM_SQR_CUTOFF)) {
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12 err = s_mp_toom_sqr(a, b);
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13 } else if (MP_HAS(S_MP_KARATSUBA_SQR) && /* Karatsuba? */
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14 (a->used >= MP_KARATSUBA_SQR_CUTOFF)) {
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15 err = s_mp_karatsuba_sqr(a, b);
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16 } else if (MP_HAS(S_MP_SQR_FAST) && /* can we use the fast comba multiplier? */
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17 (((a->used * 2) + 1) < MP_WARRAY) &&
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18 (a->used < (MP_MAXFAST / 2))) {
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19 err = s_mp_sqr_fast(a, b);
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20 } else if (MP_HAS(S_MP_SQR)) {
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21 err = s_mp_sqr(a, b);
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22 } else {
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23 err = MP_VAL;
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24 }
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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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25 b->sign = MP_ZPOS;
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26 return err;
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27 }
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28 #endif