/*
* Copyright (C) 2019 Sean Parkinson, wolfSSL Inc.
*
* 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 <wolfssl_common.h>
#ifndef WC_NO_RNG
#include <library.h>
#include <utils/debug.h>
#include <wolfssl/wolfcrypt/random.h>
#include "wolfssl_rng.h"
typedef struct private_wolfssl_rng_t private_wolfssl_rng_t;
#ifndef SINGLE_THREADED
wolfSSL_Mutex globalRngMutex;
#endif
static WC_RNG globalRng;
static bool globalRngInit;
/**
* Private data of wolfssl_rng_t
*/
struct private_wolfssl_rng_t {
/**
* Public part of this class.
*/
wolfssl_rng_t public;
/**
* Random number generator to use
* Either own instance or reference to global.
*/
WC_RNG *rng;
};
METHOD(rng_t, get_bytes, bool,
private_wolfssl_rng_t *this, size_t bytes, uint8_t *buffer)
{
int ret;
#ifndef SINGLE_THREADED
if (this->rng == &globalRng)
{
ret = wc_LockMutex(&globalRngMutex);
if (ret != 0)
{
DBG1(DBG_LIB, "locking failed, get bytes failed");
return FALSE;
}
}
#endif
ret = wc_RNG_GenerateBlock(this->rng, buffer, bytes);
#ifndef SINGLE_THREADED
if (this->rng == &globalRng)
{
wc_UnLockMutex(&globalRngMutex);
}
#endif
return ret == 0;
}
METHOD(rng_t, allocate_bytes, bool,
private_wolfssl_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_wolfssl_rng_t *this)
{
if (this->rng != &globalRng)
{
wc_FreeRng(this->rng);
free(this->rng);
}
free(this);
}
/*
* Described in header
*/
wolfssl_rng_t *wolfssl_rng_create(rng_quality_t quality)
{
private_wolfssl_rng_t *this;
INIT(this,
.public = {
.rng = {
.get_bytes = _get_bytes,
.allocate_bytes = _allocate_bytes,
.destroy = _destroy,
},
},
.rng = &globalRng,
);
if (quality > RNG_WEAK)
{
this->rng = malloc(sizeof(*this->rng));
if (wc_InitRng(this->rng) != 0)
{
DBG1(DBG_LIB, "init RNG failed, rng create failed");
free(this->rng);
free(this);
return NULL;
}
}
return &this->public;
}
/*
* Described in header
*/
int wolfssl_rng_global_init()
{
int ret = 0;
if (!globalRngInit)
{
ret = wc_InitRng(&globalRng);
if (ret != 0)
{
DBG1(DBG_LIB, "init RNG failed, rng global init failed");
}
#ifndef SINGLE_THREADED
else if ((ret = wc_InitMutex(&globalRngMutex)) != 0)
{
DBG1(DBG_LIB, "init Mutex failed, rng global init failed");
}
#endif
else
{
globalRngInit = TRUE;
}
}
return ret == 0;
}
/*
* Described in header
*/
void wolfssl_rng_global_final()
{
if (globalRngInit)
{
#ifndef SINGLE_THREADED
wc_FreeMutex(&globalRngMutex);
#endif
wc_FreeRng(&globalRng);
globalRngInit = FALSE;
}
}
#endif /* WC_NO_RNG */
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