Mercurial > dropbear

annotate libtomcrypt/src/prngs/fortuna.c @ 864:30ab30e46452

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Fix some warnings
author Matt Johnston <matt@ucc.asn.au>
date Mon, 25 Nov 2013 23:08:33 +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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12
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13 /**
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14 @file fortuna.c
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15 Fortuna PRNG, Tom St Denis
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16 */
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17
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18 /* Implementation of Fortuna by Tom St Denis
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20 We deviate slightly here for reasons of simplicity [and to fit in the API]. First all "sources"
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21 in the AddEntropy function are fixed to 0. Second since no reliable timer is provided
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22 we reseed automatically when len(pool0) >= 64 or every FORTUNA_WD calls to the read function */
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23
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24 #ifdef FORTUNA
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25
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26 /* requries SHA256 and AES */
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27 #if !(defined(RIJNDAEL) && defined(SHA256))
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28 #error FORTUNA requires SHA256 and RIJNDAEL (AES)
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29 #endif
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30
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31 #ifndef FORTUNA_POOLS
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32 #warning FORTUNA_POOLS was not previously defined (old headers?)
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33 #define FORTUNA_POOLS 32
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34 #endif
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35
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36 #if FORTUNA_POOLS < 4 || FORTUNA_POOLS > 32
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37 #error FORTUNA_POOLS must be in [4..32]
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38 #endif
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39
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40 const struct ltc_prng_descriptor fortuna_desc = {
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41 "fortuna", 1024,
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42 &fortuna_start,
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43 &fortuna_add_entropy,
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44 &fortuna_ready,
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45 &fortuna_read,
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46 &fortuna_done,
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47 &fortuna_export,
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48 &fortuna_import,
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49 &fortuna_test
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50 };
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51
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52 /* update the IV */
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53 static void fortuna_update_iv(prng_state *prng)
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54 {
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55 int x;
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56 unsigned char *IV;
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57 /* update IV */
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58 IV = prng->fortuna.IV;
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59 for (x = 0; x < 16; x++) {
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60 IV[x] = (IV[x] + 1) & 255;
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61 if (IV[x] != 0) break;
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62 }
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63 }
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64
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65 /* reseed the PRNG */
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66 static int fortuna_reseed(prng_state *prng)
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67 {
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68 unsigned char tmp[MAXBLOCKSIZE];
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69 hash_state md;
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70 int err, x;
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71
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72 ++prng->fortuna.reset_cnt;
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73
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74 /* new K == SHA256(K || s) where s == SHA256(P0) || SHA256(P1) ... */
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75 sha256_init(&md);
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