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, tomstdenis@gmail.com, http://libtomcrypt.com
10 */
11#include "tomcrypt.h"
12
13/**
14   @file dsa_export.c
15   DSA implementation, export key, Tom St Denis
16*/
17
18#ifdef MDSA
19
20/**
21  Export a DSA key to a binary packet
22  @param out    [out] Where to store the packet
23  @param outlen [in/out] The max size and resulting size of the packet
24  @param type   The type of key to export (PK_PRIVATE or PK_PUBLIC)
25  @param key    The key to export
26  @return CRYPT_OK if successful
27*/
28int dsa_export(unsigned char *out, unsigned long *outlen, int type, dsa_key *key)
29{
30   unsigned char flags[1];
31
32   LTC_ARGCHK(out    != NULL);
33   LTC_ARGCHK(outlen != NULL);
34   LTC_ARGCHK(key    != NULL);
35
36   /* can we store the static header?  */
37   if (type == PK_PRIVATE && key->type != PK_PRIVATE) {
38      return CRYPT_PK_TYPE_MISMATCH;
39   }
40
41   if (type != PK_PUBLIC && type != PK_PRIVATE) {
42      return CRYPT_INVALID_ARG;
43   }
44
45   flags[0] = (type != PK_PUBLIC) ? 1 : 0;
46
47   if (type == PK_PRIVATE) {
48      return der_encode_sequence_multi(out, outlen,
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);
56   } else {
57      return der_encode_sequence_multi(out, outlen,
58                                 LTC_ASN1_BIT_STRING,   1UL, flags,
59                                 LTC_ASN1_INTEGER,      1UL, key->g,
60                                 LTC_ASN1_INTEGER,      1UL, key->p,
61                                 LTC_ASN1_INTEGER,      1UL, key->q,
62                                 LTC_ASN1_INTEGER,      1UL, key->y,
63                                 LTC_ASN1_EOL,          0UL, NULL);
64   }
65}
66
67#endif
68
69
70/* $Source: /cvs/libtom/libtomcrypt/src/pk/dsa/dsa_export.c,v $ */
71/* $Revision: 1.8 $ */
72/* $Date: 2006/03/31 14:15:35 $ */
73