1 files changed, 92 insertions, 0 deletions
diff --git a/src/qcommon/crypto.cpp b/src/qcommon/crypto.cpp
new file mode 100644
index 0000000..dd71371
--- /dev/null
+++ b/src/qcommon/crypto.cpp
@@ -0,0 +1,92 @@
+/*
+===========================================================================
+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 );
+}