Mercurial > dropbear

comparison libtomcrypt/src/pk/dsa/dsa_shared_secret.c @ 1471:6dba84798cd5

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Update to libtomcrypt 1.18.1, merged with Dropbear changes
author Matt Johnston <matt@ucc.asn.au>
date Fri, 09 Feb 2018 21:44:05 +0800
parents f849a5ca2efc
children
comparison
equal deleted inserted replaced
1470:8bba51a55704 1471:6dba84798cd5
3 * LibTomCrypt is a library that provides various cryptographic 3 * LibTomCrypt is a library that provides various cryptographic
4 * algorithms in a highly modular and flexible manner. 4 * algorithms in a highly modular and flexible manner.
5 * 5 *
6 * The library is free for all purposes without any express 6 * The library is free for all purposes without any express
7 * guarantee it works. 7 * guarantee it works.
8 *
9 * Tom St Denis, [email protected], http://libtom.org
10 */ 8 */
11 #include "tomcrypt.h" 9 #include "tomcrypt.h"
12 10
13 /** 11 /**
14 @file dsa_shared_secret.c 12 @file dsa_shared_secret.c
15 DSA Crypto, Tom St Denis 13 DSA Crypto, Tom St Denis
16 */ 14 */
17 15
18 #ifdef LTC_MDSA 16 #ifdef LTC_MDSA
19 17
20 /** 18 /**
21 Create a DSA shared secret between two keys 19 Create a DSA shared secret between two keys
22 @param private_key The private DSA key (the exponent) 20 @param private_key The private DSA key (the exponent)
23 @param base The base of the exponentiation (allows this to be used for both encrypt and decrypt) 21 @param base The base of the exponentiation (allows this to be used for both encrypt and decrypt)
24 @param public_key The public key 22 @param public_key The public key
25 @param out [out] Destination of the shared secret 23 @param out [out] Destination of the shared secret
26 @param outlen [in/out] The max size and resulting size of the shared secret 24 @param outlen [in/out] The max size and resulting size of the shared secret
27 @return CRYPT_OK if successful 25 @return CRYPT_OK if successful
28 */ 26 */
46 44
47 if ((err = mp_exptmod(base, private_key, public_key->p, res)) != CRYPT_OK) { 45 if ((err = mp_exptmod(base, private_key, public_key->p, res)) != CRYPT_OK) {
48 mp_clear(res); 46 mp_clear(res);
49 return err; 47 return err;
50 } 48 }
51 49
52 x = (unsigned long)mp_unsigned_bin_size(res); 50 x = (unsigned long)mp_unsigned_bin_size(res);
53 if (*outlen < x) { 51 if (*outlen < x) {
54 *outlen = x; 52 *outlen = x;
55 err = CRYPT_BUFFER_OVERFLOW; 53 err = CRYPT_BUFFER_OVERFLOW;
56 goto done; 54 goto done;
64 mp_clear(res); 62 mp_clear(res);
65 return err; 63 return err;
66 } 64 }
67 65
68 #endif 66 #endif
69 /* $Source$ */ 67 /* ref: $Format:%D$ */
70 /* $Revision$ */ 68 /* git commit: $Format:%H$ */
71 /* $Date$ */ 69 /* commit time: $Format:%ai$ */
72 70