Annotation of embedaddon/strongswan/src/libstrongswan/crypto/rngs/rng.c, revision 1.1.1.1
1.1 misho 1: /*
2: * Copyright (C) 2012 Tobias Brunner
3: * Copyright (C) 2008 Martin Willi
4: * HSR Hochschule fuer Technik Rapperswil
5: *
6: * This program is free software; you can redistribute it and/or modify it
7: * under the terms of the GNU General Public License as published by the
8: * Free Software Foundation; either version 2 of the License, or (at your
9: * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
10: *
11: * This program is distributed in the hope that it will be useful, but
12: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14: * for more details.
15: */
16:
17: #include "rng.h"
18:
19: ENUM(rng_quality_names, RNG_WEAK, RNG_TRUE,
20: "RNG_WEAK",
21: "RNG_STRONG",
22: "RNG_TRUE",
23: );
24:
25: /*
26: * Described in header.
27: */
28: bool rng_get_bytes_not_zero(rng_t *rng, size_t len, uint8_t *buffer, bool all)
29: {
30: uint8_t *pos = buffer, *check = buffer + (all ? len : min(1, len));
31:
32: if (!rng->get_bytes(rng, len, pos))
33: {
34: return FALSE;
35: }
36:
37: for (; pos < check; pos++)
38: {
39: while (*pos == 0)
40: {
41: if (!rng->get_bytes(rng, 1, pos))
42: {
43: return FALSE;
44: }
45: }
46: }
47: return TRUE;
48: }
49:
50: /*
51: * Described in header.
52: */
53: bool rng_allocate_bytes_not_zero(rng_t *rng, size_t len, chunk_t *chunk,
54: bool all)
55: {
56: *chunk = chunk_alloc(len);
57: if (!rng_get_bytes_not_zero(rng, len, chunk->ptr, all))
58: {
59: chunk_clear(chunk);
60: return FALSE;
61: }
62: return TRUE;
63: }
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