annotate crypt_register_cipher.c @ 143:5d99163f7e32 libtomcrypt-orig

import of libtomcrypt 0.99
author Matt Johnston <matt@ucc.asn.au>
date Sun, 19 Dec 2004 11:34:45 +0000
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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 "mycrypt.h"
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12
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13 int register_cipher(const struct _cipher_descriptor *cipher)
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14 {
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15 int x;
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16
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17 _ARGCHK(cipher != NULL);
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18
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19 /* is it already registered? */
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20 for (x = 0; x < TAB_SIZE; x++) {
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21 if (cipher_descriptor[x].name != NULL && cipher_descriptor[x].ID == cipher->ID) {
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22 return x;
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23 }
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24 }
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25
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26 /* find a blank spot */
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27 for (x = 0; x < TAB_SIZE; x++) {
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28 if (cipher_descriptor[x].name == NULL) {
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29 XMEMCPY(&cipher_descriptor[x], cipher, sizeof(struct _cipher_descriptor));
3
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30 return x;
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31 }
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32 }
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33
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34 /* no spot */
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35 return -1;
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36 }