Mercurial > dropbear

annotate libtomcrypt/src/pk/dsa/dsa_shared_secret.c @ 1156:a8f4dade70e5

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avoid getpass when not used some systems (like android's bionic) do not provide getpass. you can disable ENABLE_CLI_PASSWORD_AUTH & ENABLE_CLI_INTERACT_AUTH to avoid its use (and rely on pubkey auth), but the link still fails because the support file calls getpass. do not define this func if both of those auth methods are not used.
author Mike Frysinger <vapier@gentoo.org>
date Wed, 21 Oct 2015 22:39:55 +0800
parents 0cbe8f6dbf9e
children f849a5ca2efc
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
382
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diff changeset
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 * Tom St Denis, [email protected], http://libtomcrypt.com
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10 */
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11 #include "tomcrypt.h"
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12
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13 /**
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14 @file dsa_shared_secret.c
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15 DSA Crypto, Tom St Denis
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16 */
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17
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18 #ifdef MDSA
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19
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20 /**
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21 Create a DSA shared secret between two keys
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22 @param private_key The private DSA key (the exponent)
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23 @param base The base of the exponentiation (allows this to be used for both encrypt and decrypt)
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24 @param public_key The public key
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25 @param out [out] Destination of the shared secret
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26 @param outlen [in/out] The max size and resulting size of the shared secret
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27 @return CRYPT_OK if successful
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28 */
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29 int dsa_shared_secret(void *private_key, void *base,
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30 dsa_key *public_key,
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31 unsigned char *out, unsigned long *outlen)
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32 {
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33 unsigned long x;
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34 void *res;
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35 int err;
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36
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37 LTC_ARGCHK(private_key != NULL);
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38 LTC_ARGCHK(public_key != NULL);
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39 LTC_ARGCHK(out != NULL);
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40 LTC_ARGCHK(outlen != NULL);
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41
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42 /* make new point */
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43 if ((err = mp_init(&res)) != CRYPT_OK) {
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44 return err;
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45 }
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46
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47 if ((err = mp_exptmod(base, private_key, public_key->p, res)) != CRYPT_OK) {
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48 mp_clear(res);
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49 return err;
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50 }
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51
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52 x = (unsigned long)mp_unsigned_bin_size(res);
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53 if (*outlen < x) {
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54 *outlen = x;
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55 err = CRYPT_BUFFER_OVERFLOW;
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56 goto done;
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57 }
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58 zeromem(out, x);
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59 if ((err = mp_to_unsigned_bin(res, out + (x - mp_unsigned_bin_size(res)))) != CRYPT_OK) { goto done; }
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60
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61 err = CRYPT_OK;
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62 *outlen = x;
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63 done:
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64 mp_clear(res);
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65 return err;
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66 }
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67
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68 #endif
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69 /* $Source: /cvs/libtom/libtomcrypt/src/pk/dsa/dsa_shared_secret.c,v $ */
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70 /* $Revision: 1.7 $ */
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71 /* $Date: 2006/12/04 03:18:43 $ */
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72