Security-55163.44.tar.gz

[apple/security.git] / libsecurity_apple_csp / lib / YarrowConnection.cpp

diff --git a/libsecurity_apple_csp/lib/YarrowConnection.cpp b/libsecurity_apple_csp/lib/YarrowConnection.cpp
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+++ b/libsecurity_apple_csp/lib/YarrowConnection.cpp
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+/*
+ * 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);
+}