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annotate src/misc/crypt/crypt_register_prng.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_register_prng.c
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15 Register a PRNG, Tom St Denis
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16 */
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17
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18 /**
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19 Register a PRNG with the descriptor table
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20 @param prng The PRNG you wish to register
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21 @return value >= 0 if successfully added (or already present), -1 if unsuccessful
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22 */
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23 int register_prng(const struct ltc_prng_descriptor *prng)
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24 {
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25 int x;
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26
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27 LTC_ARGCHK(prng != NULL);
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28
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29 /* is it already registered? */
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30 for (x = 0; x < TAB_SIZE; x++) {
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31 if (memcmp(&prng_descriptor[x], prng, sizeof(struct ltc_prng_descriptor)) == 0) {
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32 return x;
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33 }
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34 }
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35
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36 /* find a blank spot */
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37 for (x = 0; x < TAB_SIZE; x++) {
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38 if (prng_descriptor[x].name == NULL) {
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39 XMEMCPY(&prng_descriptor[x], prng, sizeof(struct ltc_prng_descriptor));
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40 return x;
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41 }
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42 }
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43
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44 /* no spot */
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45 return -1;
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46 }