[fsbl] add fsbl for cv181x/cv180x

Change-Id: I6809bc5016d4bc148f62be2ed3f8e928ec111f19

fsbl/lib/BigDigits/spExtras.h

@@ -0,0 +1,55 @@
+/* spExtras.h */
+
+/***** 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) 2001-15 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: 2015-10-22 10:23:00 $
+ * $Revision: 2.5.0 $
+ * $Author: dai $
+ */
+
+/* Interface to extra BigDigits "sp" functions that operate with single digits */
+
+#ifndef SPEXTRAS_H_
+#define SPEXTRAS_H_ 1
+
+#include "bigdigits.h"
+
+int spModMult(DIGIT_T *a, DIGIT_T x, DIGIT_T y, DIGIT_T m);
+	/* Computes a = (x * y) mod m */
+
+int spModInv(DIGIT_T *inv, DIGIT_T u, DIGIT_T v);
+	/* Computes inv = u^-1 mod v */
+
+DIGIT_T spGcd(DIGIT_T x, DIGIT_T y);
+	/* Returns gcd(x, y) */
+
+int spIsPrime(DIGIT_T w, size_t t);
+	/* Returns true if w is a probable prime, else false; t tests */
+
+/* int spModExp(DIGIT_T *exp, DIGIT_T x, DIGIT_T n, DIGIT_T d); */
+	/* Computes exp = x^n mod d */
+
+/* Two alternatives for spModExp:
+   define USE_KNUTH_MODEXP before <spExtras.h> to use Knuth method, 
+   otherwise defaults to use Binary left-to-right method */
+#ifdef USE_KNUTH_MODEXP
+#define spModExp spModExpK
+#else
+#define spModExp spModExpB
+#endif	/* USE_KNUTH_MODEXP */
+
+int spModExpK(DIGIT_T *exp, DIGIT_T x, DIGIT_T n, DIGIT_T d);
+int spModExpB(DIGIT_T *exp, DIGIT_T x, DIGIT_T n, DIGIT_T d);
+
+#endif /* SPEXTRAS_H_ */
+