1 /*
2
3 silcpubkey.c
4
5 Author: Pekka Riikonen <priikone@silcnet.org>
6
7 Copyright (C) 2005 - 2007 Pekka Riikonen
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; version 2 of the License.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 */
19
20 #include "silc.h"
21
22 /* Encodes Public Key Payload for transmitting public keys and certificates. */
23
24 SilcBuffer silc_public_key_payload_encode(SilcStack stack,
25 SilcPublicKey public_key)
26 {
27 SilcBuffer buffer;
28 unsigned char *pk;
29 SilcUInt32 pk_len;
30 SilcPKCSType type;
31
32 if (!public_key)
33 return NULL;
34
35 type = silc_pkcs_get_type(public_key);
36 pk = silc_pkcs_public_key_encode(stack, public_key, &pk_len);
37 if (!pk)
38 return NULL;
39
40 buffer = silc_buffer_salloc_size(stack, 4 + pk_len);
41 if (!buffer) {
42 silc_sfree(stack, pk);
43 return NULL;
44 }
45
46 if (silc_buffer_sformat(stack, buffer,
47 SILC_STR_UI_SHORT(pk_len),
48 SILC_STR_UI_SHORT(type),
49 SILC_STR_DATA(pk, pk_len),
50 SILC_STR_END) < 0) {
51 silc_buffer_sfree(stack, buffer);
52 silc_sfree(stack, pk);
53 return NULL;
54 }
55
56 silc_sfree(stack, pk);
57 return buffer;
58 }
59
60 /* Decodes public key payload and returns allocated public key */
61
62 SilcBool silc_public_key_payload_decode(unsigned char *data,
63 SilcUInt32 data_len,
64 SilcPublicKey *public_key)
65 {
66 SilcBufferStruct buf;
67 SilcUInt16 pk_len, pk_type;
68 unsigned char *pk;
69 int ret;
70
71 if (!public_key)
72 return FALSE;
73
74 silc_buffer_set(&buf, data, data_len);
75 ret = silc_buffer_unformat(&buf,
76 SILC_STR_ADVANCE,
77 SILC_STR_UI_SHORT(&pk_len),
78 SILC_STR_UI_SHORT(&pk_type),
79 SILC_STR_END);
80 if (ret < 0 || pk_len > data_len - 4)
81 return FALSE;
82
83 if (pk_type < SILC_PKCS_SILC || pk_type > SILC_PKCS_SPKI)
84 return FALSE;
85
86 ret = silc_buffer_unformat(&buf,
87 SILC_STR_DATA(&pk, pk_len),
88 SILC_STR_END);
89 if (ret < 0)
90 return FALSE;
91
92 return silc_pkcs_public_key_alloc((SilcPKCSType)pk_type,
93 pk, pk_len, public_key);
94 }
95
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