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/*
===========================================================================
Copyright (C) 2007-2008 Amanieu d'Antras (amanieu@gmail.com)
Copyright (C) 2015-2016 Jeff Kent (jeff@jkent.net)
Copyright (C) 2015-2019 GrangerHub
This file is part of Tremulous.
Tremulous is free software; you can redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 3 of the License,
or (at your option) any later version.
Tremulous is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Tremulous; if not, see <https://www.gnu.org/licenses/>
===========================================================================
*/
#include "crypto.h"
#include "sys/sys_shared.h"
#include "cvar.h"
#include "q_shared.h"
#include "qcommon.h"
#define TO_REAL_PTR(x) ((uint8_t*)x - sizeof(size_t))
#define TO_MOCK_PTR(x) ((uint8_t*)x + sizeof(size_t))
#define REAL_PTR_SIZE(x) (*((size_t *)x))
#define MOCK_PTR_SIZE(x) (REAL_PTR_SIZE(TO_REAL_PTR(x)))
static void *crypto_alloc( size_t size )
{
void *p;
assert( size > 0 );
p = malloc( sizeof(size_t) + size );
if ( !p )
Com_Error( ERR_FATAL, "crypto_alloc: Virtual memory exhausted." );
REAL_PTR_SIZE( p ) = size;
return TO_MOCK_PTR( p );
}
static void *crypto_realloc( void *old, size_t old_size, size_t new_size )
{
void *p;
old_size = MOCK_PTR_SIZE( old );
if ( new_size == old_size ) {
return old;
}
p = malloc( sizeof(size_t) + new_size );
if ( !p )
Com_Error( ERR_FATAL, "crypto_realloc: Virtual memory exhausted." );
REAL_PTR_SIZE( p ) = new_size;
p = TO_MOCK_PTR( p );
memcpy( p, old, MIN( old_size, new_size ) );
old = TO_REAL_PTR( old );
memset( old, 0, sizeof(size_t) + old_size );
free( old );
return p;
}
static void crypto_free( void *p, size_t size )
{
p = TO_REAL_PTR( p );
size = REAL_PTR_SIZE( p );
memset( p, 0, sizeof(size_t) + size );
free( p );
}
void Crypto_Init( void )
{
mp_set_memory_functions( crypto_alloc, crypto_realloc, crypto_free );
}
void qnettle_random( void *ctx, size_t length, uint8_t *dst )
{
Sys_CryptoRandomBytes( dst, length );
}
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