Mercurial > dropbear

annotate libtommath/bn_mp_reduce_is_2k_l.c @ 1715:3974f087d9c0

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Disallow leading lines before the ident for server (#102) Per RFC4253 4.2 clients must be able to process other lines of data before the version string, server behavior is not defined neither with MUST/SHOULD nor with MAY. If server process up to 50 lines too - it may cause too long hanging session with invalid/evil client that consume host resources and potentially may lead to DDoS on poor embedded boxes. Let's require first line from client to be version string and fail early if it's not - matches both RFC and real OpenSSH behavior.
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Mon, 15 Jun 2020 18:22:18 +0500
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_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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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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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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parents: 1470
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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