Initial import of NFC GNSS SDK project

2026-09-15 16:10:12 +08:00
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+/* $Id: arc4random.h,v 1.1 2006/09/29 02:12:55 snyderx Exp $ */
+
+/*
+ * Arc4 random number generator for OpenBSD.
+ * Copyright 1996 David Mazieres <dm@lcs.mit.edu>.
+ *
+ * Modification and redistribution in source and binary forms is
+ * permitted provided that due credit is given to the author and the
+ * OpenBSD project (for instance by leaving this copyright notice
+ * intact).
+ */
+
+/* Slightly modified to work with linux by Thomas Roessler 
+ * <roessler@sobolev.rhein.de>.
+ */
+
+/*
+ * This code is derived from section 17.1 of Applied Cryptography,
+ * second edition, which describes a stream cipher allegedly
+ * compatible with RSA Labs "RC4" cipher (the actual description of
+ * which is a trade secret).  The same algorithm is used as a stream
+ * cipher called "arcfour" in Tatu Ylonen's ssh package.
+ *
+ * Here the stream cipher has been modified always to include the time
+ * when initializing the state.  That makes it impossible to
+ * regenerate the same random sequence twice, so this can't be used
+ * for encryption, but will generate good random numbers.
+ *
+ * RC4 is a registered trademark of RSA Laboratories.
+ */
+
+#ifndef _ARC4RANDOM_H
+#define _ARC4RANDOM_H
+
+typedef unsigned char u_char;
+typedef unsigned char u_int8_t;
+typedef unsigned long u_int32_t;
+void arc4random_stir (void);
+void arc4random_addrandom (u_char *dat, int datlen);
+u_int32_t arc4random(void);
+
+#endif