YarrowConnection.cpp   [plain text]

/*
 * Copyright (c) 2000-2001 Apple Computer, Inc. All Rights Reserved.
 * 
 * The contents of this file constitute Original Code as defined in and are
 * subject to the Apple Public Source License Version 1.2 (the 'License').
 * You may not use this file except in compliance with the License. Please obtain
 * a copy of the License at http://www.apple.com/publicsource and read it before
 * using this file.
 * 
 * This Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
 * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT
 * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the
 * specific language governing rights and limitations under the License.
 */


/*
 * YarrowConnection.cpp - single, process-wide, thread-safe Yarrow client
 */
#include "YarrowConnection.h"
#include <security_utilities/globalizer.h>
#include <security_utilities/devrandom.h>
#include <Security/cssmtype.h>

/* instantiated by C++ runtime at library load/init time */
class YarrowConnection : public DevRandomGenerator {
public:
    YarrowConnection() : DevRandomGenerator(getuid() == 0), writable(getuid() == 0) { }
    const bool writable;
};

/* the single global thing */
static ModuleNexus<YarrowConnection> yarrowConnection;


/* and the exported functions */
void cspGetRandomBytes(void *buf, unsigned len)
{
	yarrowConnection().random(buf, len);
}

void cspAddEntropy(const void *buf, unsigned len)
{
    if (yarrowConnection().writable)
        yarrowConnection().addEntropy(buf, len);
}