Annotation of embedaddon/strongswan/src/libstrongswan/plugins/ntru/ntru_trits.c, revision 1.1.1.1
1.1 misho 1: /*
2: * Copyright (C) 2013-2016 Andreas Steffen
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 "ntru_trits.h"
17: #include "ntru_convert.h"
18:
19: #include <crypto/xofs/xof_bitspender.h>
20: #include <utils/debug.h>
21: #include <utils/test.h>
22:
23: typedef struct private_ntru_trits_t private_ntru_trits_t;
24:
25: /**
26: * Private data of an ntru_trits_t object.
27: */
28: struct private_ntru_trits_t {
29:
30: /**
31: * Public ntru_trits_t interface.
32: */
33: ntru_trits_t public;
34:
35: /**
36: * Size of the trits array
37: */
38: size_t trits_len;
39:
40: /**
41: * Array containing a trit per octet
42: */
43: uint8_t *trits;
44:
45: };
46:
47: METHOD(ntru_trits_t, get_size, size_t,
48: private_ntru_trits_t *this)
49: {
50: return this->trits_len;
51: }
52:
53: METHOD(ntru_trits_t, get_trits, uint8_t*,
54: private_ntru_trits_t *this)
55: {
56: return this->trits;
57: }
58:
59: METHOD(ntru_trits_t, destroy, void,
60: private_ntru_trits_t *this)
61: {
62: memwipe(this->trits, this->trits_len);
63: free(this->trits);
64: free(this);
65: }
66:
67: /*
68: * Described in header.
69: */
70: ntru_trits_t *ntru_trits_create(size_t len, ext_out_function_t alg,
71: chunk_t seed)
72: {
73: private_ntru_trits_t *this;
74: uint8_t octet, buf[5], *trits;
75: size_t trits_needed;
76: xof_bitspender_t *bitspender;
77:
78: bitspender = xof_bitspender_create(alg, seed, TRUE);
79: if (!bitspender)
80: {
81: return NULL;
82: }
83:
84: INIT(this,
85: .public = {
86: .get_size = _get_size,
87: .get_trits = _get_trits,
88: .destroy = _destroy,
89: },
90: .trits_len = len,
91: .trits = malloc(len),
92: );
93:
94: trits = this->trits;
95: trits_needed = this->trits_len;
96:
97: while (trits_needed > 0)
98: {
99: if (!bitspender->get_byte(bitspender, &octet))
100: {
101: bitspender->destroy(bitspender);
102: destroy(this);
103: return NULL;
104: }
105: if (octet < 243) /* 243 = 3^5 */
106: {
107: ntru_octet_2_trits(octet, (trits_needed < 5) ? buf : trits);
108: if (trits_needed < 5)
109: {
110: memcpy(trits, buf, trits_needed);
111: break;
112: }
113: trits += 5;
114: trits_needed -= 5;
115: }
116: }
117: bitspender->destroy(bitspender);
118:
119: return &this->public;
120: }
121:
122: EXPORT_FUNCTION_FOR_TESTS(ntru, ntru_trits_create);
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