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Annotation of embedaddon/strongswan/src/libstrongswan/crypto/rngs/rng.c, revision 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: }