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annotate libtomcrypt/src/pk/dsa/dsa_generate_key.c @ 1665:7c17995bcdfb

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Improve address logging on early exit messages (#83) Change 'Early exit' and 'Exit before auth' messages to include the IP address & port as part of the message. This allows log scanning utilities such as 'fail2ban' to obtain the offending IP address as part of the failure event instead of extracting the PID from the message and then scanning the log again for match 'child connection from' messages Signed-off-by: Kevin Darbyshire-Bryant <[email protected]>
author Kevin Darbyshire-Bryant <6500011+ldir-EDB0@users.noreply.github.com>
date Wed, 18 Mar 2020 15:28:56 +0000
parents 6dba84798cd5
children
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1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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: $Format:%ai$ */