[fsbl] add fsbl for cv181x/cv180x

Change-Id: I6809bc5016d4bc148f62be2ed3f8e928ec111f19

fsbl/lib/BigDigits/bigdRand.c

@@ -0,0 +1,78 @@
+/* $Id: bigdRand.c $ */
+
+/***** 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 $
+ */
+
+/* Random number BIGD functions that rely on spBetterRand */
+
+#include "bigdRand.h"
+#include "bigdigitsRand.h"
+
+#include <stdio.h>
+
+bdigit_t bdRandDigit(void)
+/* Return a random digit. */
+{
+	return spBetterRand();
+}
+
+size_t bdRandomBits(BIGD a, size_t nbits)
+/* Generate a random BIGD number <= 2^{nbits}-1 using internal RNG */
+{
+	const int bits_per_digit = sizeof(bdigit_t) * 8;
+	size_t i;
+	int j;
+	bdigit_t r;
+
+	bdSetZero(a);
+	bdSetBit(a, nbits-1, 0);
+	r = bdRandDigit();
+	j = bits_per_digit;
+	for (i = 0; i < nbits; i++)
+	{
+		if (j <= 0)
+		{
+			r = bdRandDigit();
+			j = bits_per_digit;
+		}
+		bdSetBit(a, i, r & 0x1);
+		r >>= 1;
+		j--;
+	}
+
+	return i;
+}
+
+/** Generate array of random octets (bytes) using internal RNG. 
+This function is in the correct form for BD_RANDFUNC.
+Seed is ignored here.
+*/
+int bdRandomOctets(unsigned char *bytes, size_t nbytes, const unsigned char *seed, size_t seedlen)
+{
+	return mpRandomOctets(bytes, nbytes, seed, seedlen);
+}
+
+size_t bdRandomNumber(BIGD a, BIGD n)
+{	/* Generate a number in the range [0, n-1] */
+	size_t nbits = bdBitLength(n);
+	bdSetZero(a);
+	do {
+		bdRandomBits(a, nbits);
+	} while (bdCompare(a, n) >= 0);
+	return bdSizeof(a);
+}
+