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annotate libtomcrypt/src/pk/rsa/rsa_sign_saltlen_get.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 6dba84798cd5
children
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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2 *
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3 * LibTomCrypt is a library that provides various cryptographic
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4 * algorithms in a highly modular and flexible manner.
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5 *
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6 * The library is free for all purposes without any express
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7 * guarantee it works.
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8 */
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9 #include "tomcrypt.h"
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10
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11 /**
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12 @file rsa_sign_saltlen_get.c
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13 Retrieve the maximum size of the salt, Steffen Jaeckel.
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14 */
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15
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16 #ifdef LTC_MRSA
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17
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18 /**
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19 Retrieve the maximum possible size of the salt when creating a PKCS#1 PSS signature.
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20 @param padding Type of padding (LTC_PKCS_1_PSS only)
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21 @param hash_idx The index of the desired hash
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22 @param key The RSA key
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23 @return The maximum salt length in bytes or INT_MAX on error.
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24 */
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25 int rsa_sign_saltlen_get_max_ex(int padding, int hash_idx, rsa_key *key)
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26 {
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27 int ret = INT_MAX;
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28 LTC_ARGCHK(key != NULL);
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29
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30 if ((hash_is_valid(hash_idx) == CRYPT_OK) &&
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31 (padding == LTC_PKCS_1_PSS))
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32 {
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33 ret = rsa_get_size(key);
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34 if (ret < INT_MAX)
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35 {
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36 ret -= (hash_descriptor[hash_idx].hashsize + 2);
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37 } /* if */
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38 } /* if */
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39
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40 return ret;
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41 }
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42
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43 #endif
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44
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45 /* ref: $Format:%D$ */
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46 /* git commit: $Format:%H$ */
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47 /* commit time: $Format:%ai$ */