Mercurial > dropbear
comparison libtomcrypt/src/pk/rsa/rsa_sign_saltlen_get.c @ 1471:6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Fri, 09 Feb 2018 21:44:05 +0800 |
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| 1470:8bba51a55704 | 1471:6dba84798cd5 |
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| 1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis | |
| 2 * | |
| 3 * LibTomCrypt is a library that provides various cryptographic | |
| 4 * algorithms in a highly modular and flexible manner. | |
| 5 * | |
| 6 * The library is free for all purposes without any express | |
| 7 * guarantee it works. | |
| 8 */ | |
| 9 #include "tomcrypt.h" | |
| 10 | |
| 11 /** | |
| 12 @file rsa_sign_saltlen_get.c | |
| 13 Retrieve the maximum size of the salt, Steffen Jaeckel. | |
| 14 */ | |
| 15 | |
| 16 #ifdef LTC_MRSA | |
| 17 | |
| 18 /** | |
| 19 Retrieve the maximum possible size of the salt when creating a PKCS#1 PSS signature. | |
| 20 @param padding Type of padding (LTC_PKCS_1_PSS only) | |
| 21 @param hash_idx The index of the desired hash | |
| 22 @param key The RSA key | |
| 23 @return The maximum salt length in bytes or INT_MAX on error. | |
| 24 */ | |
| 25 int rsa_sign_saltlen_get_max_ex(int padding, int hash_idx, rsa_key *key) | |
| 26 { | |
| 27 int ret = INT_MAX; | |
| 28 LTC_ARGCHK(key != NULL); | |
| 29 | |
| 30 if ((hash_is_valid(hash_idx) == CRYPT_OK) && | |
| 31 (padding == LTC_PKCS_1_PSS)) | |
| 32 { | |
| 33 ret = rsa_get_size(key); | |
| 34 if (ret < INT_MAX) | |
| 35 { | |
| 36 ret -= (hash_descriptor[hash_idx].hashsize + 2); | |
| 37 } /* if */ | |
| 38 } /* if */ | |
| 39 | |
| 40 return ret; | |
| 41 } | |
| 42 | |
| 43 #endif | |
| 44 | |
| 45 /* ref: $Format:%D$ */ | |
| 46 /* git commit: $Format:%H$ */ | |
| 47 /* commit time: $Format:%ai$ */ |