Initial commit of Command & Conquer Renegade source code.

Code/wwlib/srandom.h

@@ -0,0 +1,67 @@
+/*
+**	Command & Conquer Renegade(tm)
+**	Copyright 2025 Electronic Arts Inc.
+**
+**	This program 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.
+**
+**	This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef SRANDOM_H
+#define SRANDOM_H
+
+#include "random.h"	// for the helper RNG
+
+//
+//	SecureRandomClass - Generate random values that are suitable for use in cryptographic
+//		applications (under UNIX at least).
+//
+//	NOTE: The seed generation under windows isn't nearly as strong as under UNIX due to
+//		the lack of /dev/random.  If you have a good random source you can call 'Add_Seeds'
+//		to improve the quality of the seed value.
+//
+// Currently the random seed generation under windows is piss-poor so make sure and call
+//		Add_Seeds with some interesting data if you're going to use this!
+//
+//	The seed values should be unguessable by an outside viewer and the random values have
+//		good distribution properties.
+//
+class SecureRandomClass
+{
+public:
+		SecureRandomClass();
+		~SecureRandomClass();
+
+		unsigned long				Randval();				// get a 32 bit random value
+
+																	// Add randomness to the seed pool
+		void							Add_Seeds(unsigned char *values, int length);
+
+private:
+		void							Generate_Seed(void);	// Generate the inital seed
+
+		enum
+		{
+			SeedLength =			16,		// bytes in random seed
+			SHADigestBytes =		20			// length of SHA hash
+		};
+
+		static bool					Initialized;			// has the seed been initialized?
+		static unsigned char		Seeds[SeedLength];	// random seed values
+		static unsigned int		RandomCache[SHADigestBytes / sizeof(unsigned int)];
+		static int					RandomCacheEntries;
+		static unsigned int		Counter;
+
+		static Random3Class		RandomHelper;
+};
+
+#endif