Mercurial > dropbear

annotate libtomcrypt/src/misc/crypt/crypt_register_prng.c @ 702:48e173a0c52b

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Include /proc/vmstat as another random source
author Matt Johnston <matt@ucc.asn.au>
date Tue, 19 Mar 2013 19:47:29 +0800
parents 0cbe8f6dbf9e
children f849a5ca2efc
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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.com
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10 */
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11 #include "tomcrypt.h"
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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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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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27 LTC_ARGCHK(prng != NULL);
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29 /* is it already registered? */
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30 LTC_MUTEX_LOCK(&ltc_prng_mutex);
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31 for (x = 0; x < TAB_SIZE; x++) {
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32 if (XMEMCMP(&prng_descriptor[x], prng, sizeof(struct ltc_prng_descriptor)) == 0) {
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33 LTC_MUTEX_UNLOCK(&ltc_prng_mutex);
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34 return x;
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35 }
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36 }
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38 /* find a blank spot */
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39 for (x = 0; x < TAB_SIZE; x++) {
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40 if (prng_descriptor[x].name == NULL) {
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41 XMEMCPY(&prng_descriptor[x], prng, sizeof(struct ltc_prng_descriptor));
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42 LTC_MUTEX_UNLOCK(&ltc_prng_mutex);
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43 return x;
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44 }
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45 }
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47 /* no spot */
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48 LTC_MUTEX_UNLOCK(&ltc_prng_mutex);
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49 return -1;
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50 }
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51
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52 /* $Source: /cvs/libtom/libtomcrypt/src/misc/crypt/crypt_register_prng.c,v $ */
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53 /* $Revision: 1.7 $ */
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54 /* $Date: 2006/11/01 09:28:17 $ */