Mercurial > dropbear

annotate libtomcrypt/src/prngs/rng_make_prng.c @ 994:5c5ade336926

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Prefer stronger algorithms in algorithm negotiation. Prefer diffie-hellman-group14-sha1 (2048 bit) over diffie-hellman-group1-sha1 (1024 bit). Due to meet-in-the-middle attacks the effective key length of three key 3DES is 112 bits. AES is stronger and faster then 3DES. Prefer to delay the start of compression until after authentication has completed. This avoids exposing compression code to attacks from unauthenticated users. (github pull request #9)
author Fedor Brunner <fedor.brunner@azet.sk>
date Fri, 23 Jan 2015 23:00:25 +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 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 $ */