Mercurial > dropbear

annotate libtomcrypt/src/misc/crypt/crypt_find_cipher_any.c @ 1471:6dba84798cd5

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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
parents f849a5ca2efc
children
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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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11 /**
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12 @file crypt_find_cipher_any.c
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13 Find a cipher in the descriptor tables, Tom St Denis
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14 */
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16 /**
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17 Find a cipher flexibly. First by name then if not present by block and key size
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18 @param name The name of the cipher desired
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19 @param blocklen The minimum length of the block cipher desired (octets)
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20 @param keylen The minimum length of the key size desired (octets)
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21 @return >= 0 if found, -1 if not present
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22 */
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23 int find_cipher_any(const char *name, int blocklen, int keylen)
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24 {
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25 int x;
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26
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27 if(name != NULL) {
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28 x = find_cipher(name);
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29 if (x != -1) return x;
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30 }
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32 LTC_MUTEX_LOCK(&ltc_cipher_mutex);
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33 for (x = 0; x < TAB_SIZE; x++) {
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34 if (cipher_descriptor[x].name == NULL) {
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35 continue;
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36 }
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37 if (blocklen <= (int)cipher_descriptor[x].block_length && keylen <= (int)cipher_descriptor[x].max_key_length) {
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38 LTC_MUTEX_UNLOCK(&ltc_cipher_mutex);
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39 return x;
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40 }
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41 }
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42 LTC_MUTEX_UNLOCK(&ltc_cipher_mutex);
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43 return -1;
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44 }
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45
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46 /* ref: $Format:%D$ */
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47 /* git commit: $Format:%H$ */
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48 /* commit time: $Format:%ai$ */