Security-57031.1.35.tar.gz

[apple/security.git] / Security / libsecurity_utilities / lib / devrandom.h

diff --git a/Security/libsecurity_utilities/lib/devrandom.h b/Security/libsecurity_utilities/lib/devrandom.h
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+/*
+ * Copyright (c) 2000-2004,2011,2014 Apple Inc. All Rights Reserved.
+ * 
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The 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.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+
+//
+// devrandom - RNG operations based on /dev/random
+//
+#ifndef _H_DEVRANDOM
+#define _H_DEVRANDOM
+
+#include <security_utilities/utilities.h>
+#include <security_utilities/unix++.h>
+#include <security_utilities/globalizer.h>
+
+
+namespace Security {
+
+
+//
+// This RNG uses /dev/random.
+// It is not repeatable. AddEntropy() contributes random entropy to a global pool (only).
+//
+class DevRandomGenerator {
+       struct Readonly : public UnixPlusPlus::FileDesc {
+               Readonly() { open("/dev/random", O_RDONLY); }
+       };
+       
+       struct Writable : public UnixPlusPlus::FileDesc {
+               Writable() { open("/dev/random", O_RDWR); }
+       };
+
+public:
+    DevRandomGenerator(bool writable = false);
+    
+    void random(void *data, size_t length);
+    void addEntropy(const void *data, size_t length);
+
+private:
+    static ModuleNexus<Readonly> mReader;
+       static ModuleNexus<Writable> mWriter;
+};
+
+
+};     // end namespace Security
+
+
+#endif //_H_DEVRANDOM