Mercurial > dropbear
annotate libtomcrypt/src/prngs/rng_make_prng.c @ 1566:3fc0e9a0978b
add fuzzers to travis
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 01 Mar 2018 22:54:57 +0800 |
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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 #include "tomcrypt.h" |
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10 |
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11 #ifdef LTC_RNG_MAKE_PRNG |
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12 /** |
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13 @file rng_make_prng.c |
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14 portable way to get secure random bits to feed a PRNG (Tom St Denis) |
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15 */ |
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16 |
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17 /** |
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18 Create a PRNG from a RNG |
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19 @param bits Number of bits of entropy desired (64 ... 1024) |
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20 @param wprng Index of which PRNG to setup |
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21 @param prng [out] PRNG state to initialize |
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22 @param callback A pointer to a void function for when the RNG is slow, this can be NULL |
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23 @return CRYPT_OK if successful |
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24 */ |
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25 int rng_make_prng(int bits, int wprng, prng_state *prng, |
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26 void (*callback)(void)) |
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27 { |
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28 unsigned char buf[256]; |
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29 int err; |
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30 |
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31 LTC_ARGCHK(prng != NULL); |
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32 |
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33 /* check parameter */ |
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34 if ((err = prng_is_valid(wprng)) != CRYPT_OK) { |
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35 return err; |
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36 } |
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37 |
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38 if (bits < 64 || bits > 1024) { |
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39 return CRYPT_INVALID_PRNGSIZE; |
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40 } |
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41 |
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42 if ((err = prng_descriptor[wprng].start(prng)) != CRYPT_OK) { |
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43 return err; |
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44 } |
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45 |
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46 bits = ((bits/8)+((bits&7)!=0?1:0)) * 2; |
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47 if (rng_get_bytes(buf, (unsigned long)bits, callback) != (unsigned long)bits) { |
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48 return CRYPT_ERROR_READPRNG; |
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49 } |
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50 |
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51 if ((err = prng_descriptor[wprng].add_entropy(buf, (unsigned long)bits, prng)) != CRYPT_OK) { |
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52 return err; |
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53 } |
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54 |
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55 if ((err = prng_descriptor[wprng].ready(prng)) != CRYPT_OK) { |
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56 return err; |
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57 } |
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58 |
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59 #ifdef LTC_CLEAN_STACK |
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60 zeromem(buf, sizeof(buf)); |
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61 #endif |
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62 return CRYPT_OK; |
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63 } |
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64 #endif /* #ifdef LTC_RNG_MAKE_PRNG */ |
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65 |
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66 |
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67 /* ref: $Format:%D$ */ |
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68 /* git commit: $Format:%H$ */ |
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69 /* commit time: $Format:%ai$ */ |