Mercurial > dropbear

annotate libtomcrypt/src/pk/dsa/dsa_shared_secret.c @ 1902:4a6725ac957c

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Revert "Don't include sk keys at all in KEX list" This reverts git commit f972813ecdc7bb981d25b5a63638bd158f1c8e72. The sk algorithms need to remain in the sigalgs list so that they are included in the server-sig-algs ext-info message sent by the server. RFC8308 for server-sig-algs requires that all algorithms are listed (though OpenSSH client 8.4p1 tested doesn't require that)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 24 Mar 2022 13:42:08 +0800
parents 6dba84798cd5
children
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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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parents: 1435
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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: $Format:%ai$ */
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70