Annotation of embedaddon/strongswan/src/libstrongswan/plugins/pgp/pgp_encoder.c, revision 1.1.1.1
1.1 misho 1: /*
2: * Copyright (C) 2009 Martin Willi
3: * HSR Hochschule fuer Technik Rapperswil
4: *
5: * This program is free software; you can redistribute it and/or modify it
6: * under the terms of the GNU General Public License as published by the
7: * Free Software Foundation; either version 2 of the License, or (at your
8: * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
9: *
10: * This program is distributed in the hope that it will be useful, but
11: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
12: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13: * for more details.
14: */
15:
16: #include "pgp_encoder.h"
17:
18: #include <library.h>
19: #include <utils/debug.h>
20:
21: /**
22: * Build a PGPv3 fingerprint
23: */
24: static bool build_v3_fingerprint(chunk_t *encoding, va_list args)
25: {
26: hasher_t *hasher;
27: chunk_t n, e;
28:
29: if (cred_encoding_args(args, CRED_PART_RSA_MODULUS, &n,
30: CRED_PART_RSA_PUB_EXP, &e, CRED_PART_END))
31: {
32: hasher = lib->crypto->create_hasher(lib->crypto, HASH_MD5);
33: if (!hasher)
34: {
35: DBG1(DBG_LIB, "MD5 hash algorithm not supported, PGP"
36: " fingerprinting failed");
37: return FALSE;
38: }
39: /* remove leading zero bytes before hashing modulus and exponent */
40: while (n.len > 0 && n.ptr[0] == 0x00)
41: {
42: n = chunk_skip(n, 1);
43: }
44: while (e.len > 0 && e.ptr[0] == 0x00)
45: {
46: e = chunk_skip(e, 1);
47: }
48: if (!hasher->allocate_hash(hasher, n, NULL) ||
49: !hasher->allocate_hash(hasher, e, encoding))
50: {
51: hasher->destroy(hasher);
52: return FALSE;
53: }
54: hasher->destroy(hasher);
55: return TRUE;
56: }
57: return FALSE;
58: }
59:
60: /**
61: * See header.
62: */
63: bool pgp_encoder_encode(cred_encoding_type_t type, chunk_t *encoding,
64: va_list args)
65: {
66: switch (type)
67: {
68: case KEYID_PGPV3:
69: return build_v3_fingerprint(encoding, args);
70: default:
71: return FALSE;
72: }
73: }
74:
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