Mercurial > dropbear

annotate libtomcrypt/src/pk/dsa/dsa_shared_secret.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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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_shared_secret.c
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13 DSA Crypto, Tom St Denis
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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14 */
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15
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f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
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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 shared secret between two keys
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20 @param private_key The private DSA key (the exponent)
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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21 @param base The base of the exponentiation (allows this to be used for both encrypt and decrypt)
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22 @param public_key The public key
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23 @param out [out] Destination of the shared secret
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24 @param outlen [in/out] The max size and resulting size of the shared secret
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25 @return CRYPT_OK if successful
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26 */
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27 int dsa_shared_secret(void *private_key, void *base,
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28 dsa_key *public_key,
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29 unsigned char *out, unsigned long *outlen)
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30 {
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31 unsigned long x;
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32 void *res;
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33 int err;
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34
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35 LTC_ARGCHK(private_key != NULL);
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36 LTC_ARGCHK(public_key != NULL);
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37 LTC_ARGCHK(out != NULL);
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38 LTC_ARGCHK(outlen != NULL);
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39
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40 /* make new point */
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41 if ((err = mp_init(&res)) != CRYPT_OK) {
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42 return err;
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43 }
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44
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45 if ((err = mp_exptmod(base, private_key, public_key->p, res)) != CRYPT_OK) {
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46 mp_clear(res);
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47 return err;
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48 }
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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49
382
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50 x = (unsigned long)mp_unsigned_bin_size(res);
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51 if (*outlen < x) {
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52 *outlen = x;
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53 err = CRYPT_BUFFER_OVERFLOW;
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54 goto done;
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55 }
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56 zeromem(out, x);
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57 if ((err = mp_to_unsigned_bin(res, out + (x - mp_unsigned_bin_size(res)))) != CRYPT_OK) { goto done; }
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58
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59 err = CRYPT_OK;
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60 *outlen = x;
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61 done:
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62 mp_clear(res);
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63 return err;
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64 }
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65
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66 #endif
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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67 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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68 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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69 /* commit time: $Format:%ai$ */
382
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70