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Annotation of embedaddon/strongswan/src/libstrongswan/plugins/gcrypt/gcrypt_rng.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 "gcrypt_rng.h"
                     17: 
                     18: #include <gcrypt.h>
                     19: 
                     20: typedef struct private_gcrypt_rng_t private_gcrypt_rng_t;
                     21: 
                     22: /**
                     23:  * Private data of an gcrypt_rng_t object.
                     24:  */
                     25: struct private_gcrypt_rng_t {
                     26: 
                     27:        /**
                     28:         * Public gcrypt_rng_t interface.
                     29:         */
                     30:        gcrypt_rng_t public;
                     31: 
                     32:        /**
                     33:         * RNG quality of this instance
                     34:         */
                     35:        rng_quality_t quality;
                     36: };
                     37: 
                     38: METHOD(rng_t, get_bytes, bool,
                     39:        private_gcrypt_rng_t *this, size_t bytes, uint8_t *buffer)
                     40: {
                     41:        switch (this->quality)
                     42:        {
                     43:                case RNG_WEAK:
                     44:                        gcry_create_nonce(buffer, bytes);
                     45:                        break;
                     46:                case RNG_STRONG:
                     47:                        gcry_randomize(buffer, bytes, GCRY_STRONG_RANDOM);
                     48:                        break;
                     49:                case RNG_TRUE:
                     50:                        gcry_randomize(buffer, bytes, GCRY_VERY_STRONG_RANDOM);
                     51:                        break;
                     52:        }
                     53:        return TRUE;
                     54: }
                     55: 
                     56: METHOD(rng_t, allocate_bytes, bool,
                     57:        private_gcrypt_rng_t *this, size_t bytes, chunk_t *chunk)
                     58: {
                     59:        *chunk = chunk_alloc(bytes);
                     60:        get_bytes(this, chunk->len, chunk->ptr);
                     61:        return TRUE;
                     62: }
                     63: 
                     64: METHOD(rng_t, destroy, void,
                     65:        private_gcrypt_rng_t *this)
                     66: {
                     67:        free(this);
                     68: }
                     69: 
                     70: /*
                     71:  * Described in header.
                     72:  */
                     73: gcrypt_rng_t *gcrypt_rng_create(rng_quality_t quality)
                     74: {
                     75:        private_gcrypt_rng_t *this;
                     76: 
                     77:        switch (quality)
                     78:        {
                     79:                case RNG_WEAK:
                     80:                case RNG_STRONG:
                     81:                case RNG_TRUE:
                     82:                        break;
                     83:                default:
                     84:                        return NULL;
                     85:        }
                     86: 
                     87:        INIT(this,
                     88:                .public = {
                     89:                        .rng = {
                     90:                                .get_bytes = _get_bytes,
                     91:                                .allocate_bytes = _allocate_bytes,
                     92:                                .destroy = _destroy,
                     93:                        },
                     94:                },
                     95:                .quality = quality,
                     96:        );
                     97: 
                     98:        return &this->public;
                     99: }
                    100: