[fsbl] add fsbl for cv181x/cv180x

Change-Id: I6809bc5016d4bc148f62be2ed3f8e928ec111f19

fsbl/lib/BigDigits/bigdRand.h

@@ -0,0 +1,69 @@
+/* $Id: bigdRand.h $ */
+
+/** @file
+    Interface for BigDigits "bd" random number functions using a "pretty-good" internal RNG
+
+@par The internal random number generator (RNG)
+The internal RNG uses a variant of the random number generation algorithm 
+in Appendix A of ANSI X9.31-1998, but using the Tiny Encryption Algorithm (TEAX)
+instead of the Data Encryption Algorithm (DEA). 
+It uses the current time and process ID as a seed. 
+Although not strictly crypto secure, it is "pretty good", and certainly much better than
+anything using the built-in rand() function in C. Look at the source code and make your own call.
+
+@par 
+If you want proper cryptographic security, use the bdRandomSeeded() function with a call to a
+secure RNG function that you trust.
+*/
+
+/***** BEGIN LICENSE BLOCK *****
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * Copyright (c) 2001-16 David Ireland, D.I. Management Services Pty Limited
+ * <http://www.di-mgt.com.au/bigdigits.html>. All rights reserved.
+ *
+ ***** END LICENSE BLOCK *****/
+/*
+ * Last updated:
+ * $Date: 2016-03-31 09:51:00 $
+ * $Revision: 2.6.1 $
+ * $Author: dai $
+ */
+
+#ifndef BIGDRAND_H_
+#define BIGDRAND_H_ 1
+
+#include "bigd.h"
+#include "bigdRand.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Generate a single random digit using internal RNG. */
+bdigit_t bdRandDigit(void);
+
+/** Generate a random BIGD number of bit length at most \c nbits using internal RNG
+@param[out] a to receive generated random number
+@param[in]  nbits maximum number of bits
+@returns Number of digits actually set  
+*/
+size_t bdRandomBits(BIGD a, size_t nbits);
+
+/* Added in [v2.4] */
+/** Generate array of random octets (bytes) using internal RNG
+ *  @remarks This function is in the correct form for BD_RANDFUNC. 
+ */ 
+int bdRandomOctets(unsigned char *bytes, size_t nbytes, const unsigned char *seed, size_t seedlen);
+
+/** Generate a number at random from a uniform distribution in [0, n-1] */
+size_t bdRandomNumber(BIGD a, BIGD n);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* BIGDRAND_H_ */