Mercurial > dropbear

comparison libtomcrypt/src/pk/dsa/dsa_import.c @ 285:1b9e69c058d2

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3) to branch 'au.asn.ucc.matt.dropbear' (head fdf4a7a3b97ae5046139915de7e40399cceb2c01)
author Matt Johnston <matt@ucc.asn.au>
date Wed, 08 Mar 2006 13:23:58 +0000
parents
children 0cbe8f6dbf9e
comparison
equal deleted inserted replaced
281:997e6f7dc01e 285:1b9e69c058d2
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 * Tom St Denis, [email protected], http://libtomcrypt.org
10 */
11 #include "tomcrypt.h"
12
13 /**
14 @file dsa_import.c
15 DSA implementation, import a DSA key, Tom St Denis
16 */
17
18 #ifdef MDSA
19
20 /**
21 Import a DSA key
22 @param in The binary packet to import from
23 @param inlen The length of the binary packet
24 @param key [out] Where to store the imported key
25 @return CRYPT_OK if successful, upon error this function will free all allocated memory
26 */
27 int dsa_import(const unsigned char *in, unsigned long inlen, dsa_key *key)
28 {
29 unsigned char flags[1];
30 int err;
31
32 LTC_ARGCHK(in != NULL);
33 LTC_ARGCHK(key != NULL);
34
35 /* init key */
36 if (mp_init_multi(&key->p, &key->g, &key->q, &key->x, &key->y, NULL) != MP_OKAY) {
37 return CRYPT_MEM;
38 }
39
40 /* get key type */
41 if ((err = der_decode_sequence_multi(in, inlen,
42 LTC_ASN1_BIT_STRING, 1UL, flags,
43 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
44 goto error;
45 }
46
47 if (flags[0] == 1) {
48 if ((err = der_decode_sequence_multi(in, inlen,
49 LTC_ASN1_BIT_STRING, 1UL, flags,
50 LTC_ASN1_INTEGER, 1UL, &key->g,
51 LTC_ASN1_INTEGER, 1UL, &key->p,
52 LTC_ASN1_INTEGER, 1UL, &key->q,
53 LTC_ASN1_INTEGER, 1UL, &key->y,
54 LTC_ASN1_INTEGER, 1UL, &key->x,
55 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
56 goto error;
57 }
58 key->type = PK_PRIVATE;
59 } else {
60 if ((err = der_decode_sequence_multi(in, inlen,
61 LTC_ASN1_BIT_STRING, 1UL, flags,
62 LTC_ASN1_INTEGER, 1UL, &key->g,
63 LTC_ASN1_INTEGER, 1UL, &key->p,
64 LTC_ASN1_INTEGER, 1UL, &key->q,
65 LTC_ASN1_INTEGER, 1UL, &key->y,
66 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
67 goto error;
68 }
69 key->type = PK_PUBLIC;
70 }
71 key->qord = mp_unsigned_bin_size(&key->q);
72
73 if (key->qord >= MDSA_MAX_GROUP || key->qord <= 15 ||
74 key->qord >= mp_unsigned_bin_size(&key->p) || (mp_unsigned_bin_size(&key->p) - key->qord) >= MDSA_DELTA) {
75 err = CRYPT_INVALID_PACKET;
76 goto error;
77 }
78
79 return CRYPT_OK;
80 error:
81 mp_clear_multi(&key->p, &key->g, &key->q, &key->x, &key->y, NULL);
82 return err;
83 }
84
85 #endif
86
87 /* $Source: /cvs/libtom/libtomcrypt/src/pk/dsa/dsa_import.c,v $ */
88 /* $Revision: 1.7 $ */
89 /* $Date: 2005/06/08 23:31:17 $ */