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comparison libtomcrypt/src/pk/dh/dh_export.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 Export a DH key to a binary packet
16 @param out [out] The destination for the key
17 @param outlen [in/out] The max size and resulting size of the DH key
18 @param type Which type of key (PK_PRIVATE or PK_PUBLIC)
19 @param key The key you wish to export
20 @return CRYPT_OK if successful
21 */
22 int dh_export(unsigned char *out, unsigned long *outlen, int type, dh_key *key)
23 {
24 unsigned char flags[1];
25 int err;
26 unsigned long version = 0;
27
28 LTC_ARGCHK(out != NULL);
29 LTC_ARGCHK(outlen != NULL);
30 LTC_ARGCHK(key != NULL);
31
32 if (type == PK_PRIVATE) {
33 /* export x - private key */
34 flags[0] = 1;
35 err = der_encode_sequence_multi(out, outlen,
36 LTC_ASN1_SHORT_INTEGER, 1UL, &version,
37 LTC_ASN1_BIT_STRING, 1UL, flags,
38 LTC_ASN1_INTEGER, 1UL, key->prime,
39 LTC_ASN1_INTEGER, 1UL, key->base,
40 LTC_ASN1_INTEGER, 1UL, key->x,
41 LTC_ASN1_EOL, 0UL, NULL);
42 }
43 else {
44 /* export y - public key */
45 flags[0] = 0;
46 err = der_encode_sequence_multi(out, outlen,
47 LTC_ASN1_SHORT_INTEGER, 1UL, &version,
48 LTC_ASN1_BIT_STRING, 1UL, flags,
49 LTC_ASN1_INTEGER, 1UL, key->prime,
50 LTC_ASN1_INTEGER, 1UL, key->base,
51 LTC_ASN1_INTEGER, 1UL, key->y,
52 LTC_ASN1_EOL, 0UL, NULL);
53 }
54
55 return err;
56 }
57
58 #endif /* LTC_MDH */
59
60 /* ref: $Format:%D$ */
61 /* git commit: $Format:%H$ */
62 /* commit time: $Format:%ai$ */