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annotate libtomcrypt/src/pk/dsa/dsa_generate_key.c @ 1630:9579377b5f8b

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use strlcpy & strlcat (#74) * refactor checkpubkeyperms() with safe BSD functions fix gcc8 warnings ``` svr-authpubkey.c: In function 'checkpubkeyperms': svr-authpubkey.c:427:2: warning: 'strncat' specified bound 5 equals source length [-Wstringop-overflow=] strncat(filename, "/.ssh", 5); /* strlen("/.ssh") == 5 */ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ svr-authpubkey.c:433:2: warning: 'strncat' specified bound 16 equals source length [-Wstringop-overflow=] strncat(filename, "/authorized_keys", 16); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ``` see https://www.sudo.ws/todd/papers/strlcpy.html * restore strlcpy in xstrdup see original https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/xmalloc.c?rev=1.16
author François Perrad <francois.perrad@gadz.org>
date Wed, 20 Mar 2019 15:09:19 +0100
parents 6dba84798cd5
children
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1471
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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 /**
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12 @file dsa_make_key.c
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13 DSA implementation, generate a DSA key
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14 */
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15
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16 #ifdef LTC_MDSA
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17
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18 /**
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19 Create a DSA key
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20 @param prng An active PRNG state
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21 @param wprng The index of the PRNG desired
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22 @param key [in/out] Where to store the created key
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23 @return CRYPT_OK if successful.
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24 */
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25 int dsa_generate_key(prng_state *prng, int wprng, dsa_key *key)
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26 {
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27 int err;
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28
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29 LTC_ARGCHK(key != NULL);
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30 LTC_ARGCHK(ltc_mp.name != NULL);
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31
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32 /* so now we have our DH structure, generator g, order q, modulus p
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33 Now we need a random exponent [mod q] and it's power g^x mod p
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34 */
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35 /* private key x should be from range: 1 <= x <= q-1 (see FIPS 186-4 B.1.2) */
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36 if ((err = rand_bn_upto(key->x, key->q, prng, wprng)) != CRYPT_OK) { return err; }
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37 if ((err = mp_exptmod(key->g, key->x, key->p, key->y)) != CRYPT_OK) { return err; }
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38 key->type = PK_PRIVATE;
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39
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40 return CRYPT_OK;
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41 }
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42
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43 #endif
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44
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45 /* ref: $Format:%D$ */
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46 /* git commit: $Format:%H$ */
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47 /* commit time: $Format:%ai$ */