Mercurial > dropbear

annotate libtomcrypt/src/prngs/rng_make_prng.c @ 1659:d32bcb5c557d

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Add Ed25519 support (#91) * Add support for Ed25519 as a public key type Ed25519 is a elliptic curve signature scheme that offers better security than ECDSA and DSA and good performance. It may be used for both user and host keys. OpenSSH key import and fuzzer are not supported yet. Initially inspired by Peter Szabo. * Add curve25519 and ed25519 fuzzers * Add import and export of Ed25519 keys
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Wed, 11 Mar 2020 21:09:45 +0500
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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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: $Format:%ai$ */