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/*
* Copyright (C) 2012 Aleksandr Grinberg
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <utils/debug.h>
#include <openssl/rand.h>
#include <openssl/err.h>
#include "openssl_rng.h"
typedef struct private_openssl_rng_t private_openssl_rng_t;
/**
* Private data of openssl_rng_t
*/
struct private_openssl_rng_t {
/**
* Public part of this class.
*/
openssl_rng_t public;
/**
* Quality of randomness
*/
rng_quality_t quality;
};
METHOD(rng_t, get_bytes, bool,
private_openssl_rng_t *this, size_t bytes, u_int8_t *buffer)
{
if (this->quality == RNG_WEAK)
{
/* RAND_pseudo_bytes() returns 1 if returned bytes are strong,
* 0 if of not. Both is acceptable for RNG_WEAK. */
return RAND_pseudo_bytes((char*)buffer, bytes) != -1;
}
/* A 0 return value is a failure for RAND_bytes() */
return RAND_bytes((char*)buffer, bytes) == 1;
}
METHOD(rng_t, allocate_bytes, bool,
private_openssl_rng_t *this, size_t bytes, chunk_t *chunk)
{
*chunk = chunk_alloc(bytes);
if (!get_bytes(this, chunk->len, chunk->ptr))
{
chunk_free(chunk);
return FALSE;
}
return TRUE;
}
METHOD(rng_t, destroy, void,
private_openssl_rng_t *this)
{
free(this);
}
/*
* Described in header.
*/
openssl_rng_t *openssl_rng_create(rng_quality_t quality)
{
private_openssl_rng_t *this;
INIT(this,
.public = {
.rng = {
.get_bytes = _get_bytes,
.allocate_bytes = _allocate_bytes,
.destroy = _destroy,
},
},
.quality = quality,
);
return &this->public;
}
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