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annotate libtomcrypt/src/pk/dh/dh_export_key.c @ 1934:83b6a47759a8

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Add m_snprintf() that won't return negative
author Matt Johnston <matt@ucc.asn.au>
date Fri, 01 Apr 2022 12:10:48 +0800
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
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10 #include "tomcrypt.h"
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11
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12 #ifdef LTC_MDH
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13
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14 /**
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15 Binary export a DH key to a buffer
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16 @param out [out] The destination for the key
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17 @param outlen [in/out] The max size and resulting size of the DH key
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18 @param type Which type of key (PK_PRIVATE or PK_PUBLIC)
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19 @param key The key you wish to export
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20 @return CRYPT_OK if successful
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21 */
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22 int dh_export_key(void *out, unsigned long *outlen, int type, dh_key *key)
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23 {
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24 unsigned long len;
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25 void *k;
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26
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27 LTC_ARGCHK(out != NULL);
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28 LTC_ARGCHK(outlen != NULL);
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29 LTC_ARGCHK(key != NULL);
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30
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31 k = (type == PK_PRIVATE) ? key->x : key->y;
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32 len = mp_unsigned_bin_size(k);
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33
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34 if (*outlen < len) {
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35 *outlen = len;
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36 return CRYPT_BUFFER_OVERFLOW;
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37 }
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38 *outlen = len;
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39
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40 return mp_to_unsigned_bin(k, out);
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41 }
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42
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43 #endif /* LTC_MDH */
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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: $Format:%ai$ */