1 // SPDX-License-Identifier: BSD-2-Clause 2 /* LibTomCrypt, modular cryptographic library -- Tom St Denis 3 * 4 * LibTomCrypt is a library that provides various cryptographic 5 * algorithms in a highly modular and flexible manner. 6 * 7 * The library is free for all purposes without any express 8 * guarantee it works. 9 */ 10 #include "tomcrypt_private.h" 11 12 /** 13 @file rsa_sign_saltlen_get.c 14 Retrieve the maximum size of the salt, Steffen Jaeckel. 15 */ 16 17 #ifdef LTC_MRSA 18 19 /** 20 Retrieve the maximum possible size of the salt when creating a PKCS#1 PSS signature. 21 @param padding Type of padding (LTC_PKCS_1_PSS only) 22 @param hash_idx The index of the desired hash 23 @param key The RSA key 24 @return The maximum salt length in bytes or INT_MAX on error. 25 */ rsa_sign_saltlen_get_max_ex(int padding,int hash_idx,const rsa_key * key)26int rsa_sign_saltlen_get_max_ex(int padding, int hash_idx, const rsa_key *key) 27 { 28 int ret = INT_MAX; 29 LTC_ARGCHK(key != NULL); 30 31 if ((hash_is_valid(hash_idx) == CRYPT_OK) && 32 (padding == LTC_PKCS_1_PSS)) 33 { 34 ret = rsa_get_size(key); 35 if (ret < INT_MAX) 36 { 37 ret -= (hash_descriptor[hash_idx]->hashsize + 2); 38 } /* if */ 39 } /* if */ 40 41 return ret; 42 } 43 44 #endif 45 46 /* ref: $Format:%D$ */ 47 /* git commit: $Format:%H$ */ 48 /* commit time: $Format:%ai$ */ 49