Mercurial > dropbear

annotate libtomcrypt/src/pk/dsa/dsa_shared_secret.c @ 1715:3974f087d9c0

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Disallow leading lines before the ident for server (#102) Per RFC4253 4.2 clients must be able to process other lines of data before the version string, server behavior is not defined neither with MUST/SHOULD nor with MAY. If server process up to 50 lines too - it may cause too long hanging session with invalid/evil client that consume host resources and potentially may lead to DDoS on poor embedded boxes. Let's require first line from client to be version string and fail early if it's not - matches both RFC and real OpenSSH behavior.
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Mon, 15 Jun 2020 18:22:18 +0500
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
382
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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 }
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: $Format:%ai$ */
382
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70