Return to rng.c CVS log

Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / strongswan / src / libstrongswan / crypto / rngs

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: }