Mercurial > dropbear

annotate libtomcrypt/src/prngs/rng_make_prng.c @ 1902:4a6725ac957c

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Revert "Don't include sk keys at all in KEX list" This reverts git commit f972813ecdc7bb981d25b5a63638bd158f1c8e72. The sk algorithms need to remain in the sigalgs list so that they are included in the server-sig-algs ext-info message sent by the server. RFC8308 for server-sig-algs requires that all algorithms are listed (though OpenSSH client 8.4p1 tested doesn't require that)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 24 Mar 2022 13:42:08 +0800
parents 6dba84798cd5
children
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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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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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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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38 if (bits < 64 || bits > 1024) {
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39 return CRYPT_INVALID_PRNGSIZE;
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40 }
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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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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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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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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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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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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: $Format:%ai$ */