Mercurial > dropbear

annotate libtomcrypt/src/prngs/rng_make_prng.c @ 447:278805938dcf

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Patch from Nicolai Ehemann to try binding before going to the background, so that if it exits early (because something's already listening etc) then it will return an exitcode of 1.
author Matt Johnston <matt@ucc.asn.au>
date Thu, 19 Jul 2007 15:54:18 +0000
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 rng_make_prng.c
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15 portable way to get secure random bits to feed a PRNG (Tom St Denis)
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16 */
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18 /**
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19 Create a PRNG from a RNG
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20 @param bits Number of bits of entropy desired (64 ... 1024)
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21 @param wprng Index of which PRNG to setup
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22 @param prng [out] PRNG state to initialize
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23 @param callback A pointer to a void function for when the RNG is slow, this can be NULL
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24 @return CRYPT_OK if successful
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25 */
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26 int rng_make_prng(int bits, int wprng, prng_state *prng,
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27 void (*callback)(void))
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28 {
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29 unsigned char buf[256];
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30 int err;
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32 LTC_ARGCHK(prng != NULL);
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34 /* check parameter */
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35 if ((err = prng_is_valid(wprng)) != CRYPT_OK) {
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36 return err;
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37 }
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39 if (bits < 64 || bits > 1024) {
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40 return CRYPT_INVALID_PRNGSIZE;
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41 }
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43 if ((err = prng_descriptor[wprng].start(prng)) != CRYPT_OK) {
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44 return err;
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45 }
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47 bits = ((bits/8)+((bits&7)!=0?1:0)) * 2;
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48 if (rng_get_bytes(buf, (unsigned long)bits, callback) != (unsigned long)bits) {
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49 return CRYPT_ERROR_READPRNG;
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50 }
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52 if ((err = prng_descriptor[wprng].add_entropy(buf, (unsigned long)bits, prng)) != CRYPT_OK) {
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53 return err;
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54 }
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56 if ((err = prng_descriptor[wprng].ready(prng)) != CRYPT_OK) {
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57 return err;
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58 }
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60 #ifdef LTC_CLEAN_STACK
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61 zeromem(buf, sizeof(buf));
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62 #endif
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63 return CRYPT_OK;
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64 }
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67 /* $Source: /cvs/libtom/libtomcrypt/src/prngs/rng_make_prng.c,v $ */
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68 /* $Revision: 1.4 $ */
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69 /* $Date: 2006/03/31 14:15:35 $ */