X-Git-Url: https://git.distorted.org.uk/~mdw/catacomb/blobdiff_plain/92c2a29042b4e2b5b4429f9848dc22fd92acb0d8..893c6259cd5d374f540e54def522dcd251c4c503:/mprand.h?ds=inline

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+/* -*-c-*-
+ *
+ * $Id: mprand.h,v 1.1 1999/12/10 23:23:05 mdw Exp $
+ *
+ * Generate a random multiprecision integer
+ *
+ * (c) 1999 Straylight/Edgeware
+ */
+
+/*----- Licensing notice --------------------------------------------------* 
+ *
+ * This file is part of Catacomb.
+ *
+ * Catacomb is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Library General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ * 
+ * Catacomb 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 Library General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Library General Public
+ * License along with Catacomb; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ */
+
+/*----- Revision history --------------------------------------------------* 
+ *
+ * $Log: mprand.h,v $
+ * Revision 1.1  1999/12/10 23:23:05  mdw
+ * Support for generating random large integers.
+ *
+ */
+
+#ifndef CATACOMB_MPRAND_H
+#define CATACOMB_MPRAND_H
+
+#ifdef __cplusplus
+  extern "C" {
+#endif
+
+/*----- Header files ------------------------------------------------------*/
+
+#ifndef CATACOMB_GRAND_H
+#  include "grand.h"
+#endif
+
+#ifndef CATACOMB_MP_H
+#  include "mp.h"
+#endif
+
+/*----- Functions provided ------------------------------------------------*/
+
+/* --- @mprand@ --- *
+ *
+ * Arguments:	@mp *d@ = destination integer
+ *		@unsigned b@ = number of bits
+ *		@grand *r@ = pointer to random number source
+ *		@mpw or@ = mask to OR with low-order bits
+ *
+ * Returns:	A random integer with the requested number of bits
+ *
+ * Use:		Constructs an arbitrarily large pseudorandom integer.
+ *		Assuming that the generator @r@ is good, the result is
+ *		uniformly distributed in the interval %$[2^{b - 1}, 2^b)$%.
+ *		The result is then ORred with the given @or@ value.  This
+ *		will often be 1, to make the result odd.
+ */
+
+extern mp *mprand(mp */*d*/, unsigned /*b*/, grand */*r*/, mpw /*or*/);
+
+/*----- That's all, folks -------------------------------------------------*/
+
+#ifdef __cplusplus
+  }
+#endif
+
+#endif