Mercurial > dropbear

annotate libtomcrypt/src/pk/dsa/dsa_shared_secret.c @ 1837:df7bfd2f7d45

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Add "make test" target to run pytest This will create a virtualenv if required. There is a bit of churn here reverting to autoconf 2.59 in generated config.h.in and configure
author Matt Johnston <matt@codeconstruct.com.au>
date Mon, 18 Oct 2021 14:24:32 +0800
parents 6dba84798cd5
children
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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
1435
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 }
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
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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