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annotate src/misc/crypt/crypt_find_cipher_any.c @ 191:1c15b283127b libtomcrypt-orig

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Import of libtomcrypt 1.02 with manual path rename rearrangement etc
author Matt Johnston <matt@ucc.asn.au>
date Fri, 06 May 2005 13:23:02 +0000
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children 39d5d58461d6
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191
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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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 * Tom St Denis, [email protected], http://libtomcrypt.org
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10 */
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11 #include "tomcrypt.h"
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12
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13 /**
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14 @file crypt_find_cipher_any.c
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15 Find a cipher in the descriptor tables, Tom St Denis
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16 */
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17
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18 /**
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19 Find a cipher flexibly. First by name then if not present by block and key size
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20 @param name The name of the cipher desired
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21 @param blocklen The minimum length of the block cipher desired (octets)
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22 @param keylen The minimum length of the key size desired (octets)
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23 @return >= 0 if found, -1 if not present
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24 */
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25 int find_cipher_any(const char *name, int blocklen, int keylen)
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26 {
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27 int x;
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28
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29 LTC_ARGCHK(name != NULL);
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30
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31 x = find_cipher(name);
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32 if (x != -1) return x;
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33
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34 for (x = 0; x < TAB_SIZE; x++) {
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35 if (cipher_descriptor[x].name == NULL) {
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36 continue;
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37 }
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38 if (blocklen <= (int)cipher_descriptor[x].block_length && keylen <= (int)cipher_descriptor[x].max_key_length) {
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39 return x;
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40 }
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41 }
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42 return -1;
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43 }