1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis */ 2 /* SPDX-License-Identifier: Unlicense */ 3 #include "tomcrypt_private.h" 4 5 /** 6 @file rsa_sign_saltlen_get.c 7 Retrieve the maximum size of the salt, Steffen Jaeckel. 8 */ 9 10 #ifdef LTC_MRSA 11 12 /** 13 Retrieve the maximum possible size of the salt when creating a PKCS#1 PSS signature. 14 @param padding Type of padding (LTC_PKCS_1_PSS only) 15 @param hash_idx The index of the desired hash 16 @param key The RSA key 17 @return The maximum salt length in bytes or INT_MAX on error. 18 */ rsa_sign_saltlen_get_max_ex(int padding,int hash_idx,const rsa_key * key)19int rsa_sign_saltlen_get_max_ex(int padding, int hash_idx, const rsa_key *key) 20 { 21 int ret = INT_MAX; 22 LTC_ARGCHK(key != NULL); 23 24 if ((hash_is_valid(hash_idx) == CRYPT_OK) && 25 (padding == LTC_PKCS_1_PSS)) 26 { 27 ret = rsa_get_size(key); 28 if (ret < INT_MAX) 29 { 30 ret -= (hash_descriptor[hash_idx]->hashsize + 2); 31 } /* if */ 32 } /* if */ 33 34 return ret; 35 } 36 37 #endif 38