X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/blobdiff_plain/1ba83484ee5bb486da9aa958576de4bc29ef0c1d..34e4f738bcba58e6d8c4cabbb0b3232a65b42a9d:/group-exp.h?ds=sidebyside

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+/* -*-c-*-
+ *
+ * $Id: group-exp.h,v 1.1 2004/04/01 12:50:09 mdw Exp $
+ *
+ * Exponentiation operations for abstract groups
+ *
+ * (c) 2004 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: group-exp.h,v $
+ * Revision 1.1  2004/04/01 12:50:09  mdw
+ * Add cyclic group abstraction, with test code.  Separate off exponentation
+ * functions for better static linking.  Fix a buttload of bugs on the way.
+ * Generally ensure that negative exponents do inversion correctly.  Add
+ * table of standard prime-field subgroups.  (Binary field subgroups are
+ * currently unimplemented but easy to add if anyone ever finds a good one.)
+ *
+ */
+
+#ifndef CATACOMB_GROUP_EXP_H
+#define CATACOMB_GROUP_EXP_H
+
+#ifdef __cplusplus
+  extern "C" {
+#endif
+
+/*----- Exponentation definitions -----------------------------------------*/
+
+#define EXP_TYPE ge *
+
+#define EXP_COPY(d, p) do {						\
+  (d) = G_CREATE(gg);							\
+  G_COPY(gg, (d), (p));							\
+} while (0)
+#define EXP_DROP(x) G_DESTROY(gg, (x))
+
+#define EXP_MUL(a, x) G_MUL(gg, (a), (a), (x))
+#define EXP_SQR(a) G_SQR(gg, (a), (a));
+#define EXP_FIX(x)
+
+#define EXP_SETMUL(d, x, y) do {					\
+  (d) = G_CREATE(gg);							\
+  G_MUL(gg, (d), (x), (y));						\
+} while (0)
+#define EXP_SETSQR(d, x) do {						\
+  (d) = G_CREATE(gg);							\
+  G_SQR(gg, (d), (x));							\
+} while (0)
+
+#include "exp.h"
+
+/*----- That's all, folks -------------------------------------------------*/
+
+#ifdef __cplusplus
+  }
+#endif
+
+#endif