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annotate libtomcrypt/src/pk/rsa/rsa_sign_saltlen_get.c @ 1555:2f0c3f3361d3

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Added tag DROPBEAR_2018.76 for changeset 1c66ca4f3791
author Matt Johnston <matt@ucc.asn.au>
date Tue, 27 Feb 2018 22:48:42 +0800
parents 6dba84798cd5
children
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1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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: $Format:%ai$ */