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comparison libtomcrypt/src/pk/dh/dh_set_pg_dhparam.c @ 1471:6dba84798cd5

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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
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1470:8bba51a55704 1471:6dba84798cd5
1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
2 *
3 * LibTomCrypt is a library that provides various cryptographic
4 * algorithms in a highly modular and flexible manner.
5 *
6 * The library is free for all purposes without any express
7 * guarantee it works.
8 */
9
10 #include "tomcrypt.h"
11
12 #ifdef LTC_MDH
13
14 /**
15 Import DH key parts p and g from dhparam
16
17 dhparam data: openssl dhparam -outform DER -out dhparam.der 2048
18
19 @param dhparam The DH param DER encoded data
20 @param dhparamlen The length of dhparam data
21 @param key [out] Where the newly created DH key will be stored
22 @return CRYPT_OK if successful, note: on error all allocated memory will be freed automatically.
23 */
24 int dh_set_pg_dhparam(const unsigned char *dhparam, unsigned long dhparamlen, dh_key *key)
25 {
26 int err;
27
28 LTC_ARGCHK(key != NULL);
29 LTC_ARGCHK(ltc_mp.name != NULL);
30 LTC_ARGCHK(dhparam != NULL);
31 LTC_ARGCHK(dhparamlen > 0);
32
33 if ((err = mp_init_multi(&key->x, &key->y, &key->base, &key->prime, NULL)) != CRYPT_OK) {
34 return err;
35 }
36 if ((err = der_decode_sequence_multi(dhparam, dhparamlen,
37 LTC_ASN1_INTEGER, 1UL, key->prime,
38 LTC_ASN1_INTEGER, 1UL, key->base,
39 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
40 goto LBL_ERR;
41 }
42
43 return CRYPT_OK;
44
45 LBL_ERR:
46 dh_free(key);
47 return err;
48 }
49
50 #endif /* LTC_MDH */
51
52 /* ref: $Format:%D$ */
53 /* git commit: $Format:%H$ */
54 /* commit time: $Format:%ai$ */