38 lines
931 B
C
38 lines
931 B
C
/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
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/* SPDX-License-Identifier: Unlicense */
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#include "tomcrypt_private.h"
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/**
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@file rsa_sign_saltlen_get.c
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Retrieve the maximum size of the salt, Steffen Jaeckel.
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*/
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#ifdef LTC_MRSA
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/**
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Retrieve the maximum possible size of the salt when creating a PKCS#1 PSS signature.
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@param padding Type of padding (LTC_PKCS_1_PSS only)
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@param hash_idx The index of the desired hash
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@param key The RSA key
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@return The maximum salt length in bytes or INT_MAX on error.
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*/
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int rsa_sign_saltlen_get_max_ex(int padding, int hash_idx, const rsa_key *key)
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{
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int ret = INT_MAX;
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LTC_ARGCHK(key != NULL);
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if ((hash_is_valid(hash_idx) == CRYPT_OK) &&
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(padding == LTC_PKCS_1_PSS))
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{
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ret = rsa_get_size(key);
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if (ret < INT_MAX)
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{
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ret -= (hash_descriptor[hash_idx].hashsize + 2);
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} /* if */
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} /* if */
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return ret;
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}
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#endif
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