Mercurial > dropbear
annotate libtomcrypt/src/pk/dh/dh_export_key.c @ 1717:295377ecbf49
Add DEVELOPING.md
author | Matt Johnston <matt@ucc.asn.au> |
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date | Mon, 15 Jun 2020 22:30:28 +0800 |
parents | 6dba84798cd5 |
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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: $Format:%ai$ */ |