Mercurial > dropbear

comparison libtomcrypt/src/pk/dsa/dsa_import.c @ 302:973fccb59ea4 ucc-axis-hack

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propagate from branch 'au.asn.ucc.matt.dropbear' (head 11034278bd1917bebcbdc69cf53b1891ce9db121) to branch 'au.asn.ucc.matt.dropbear.ucc-axis-hack' (head 10a1f614fec73d0820c3f61160d9db409b9beb46)
author Matt Johnston <matt@ucc.asn.au>
date Sat, 25 Mar 2006 12:59:58 +0000
parents 1b9e69c058d2
children 0cbe8f6dbf9e
comparison
equal deleted inserted replaced
299:740e782679be 302:973fccb59ea4
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 $ */