Add cyclic group abstraction, with test code. Separate off exponentation

[u/mdw/catacomb] / buf.h

diff --git a/buf.h b/buf.h
index ae5d993..6307c26 100644 (file)
--- a/buf.h
+++ b/buf.h
@@ -1,8 +1,9 @@
 /* -*-c-*-
  *
- * $Id: buf.h,v 1.1 2003/10/11 21:02:33 mdw Exp $
+ * $Id: buf.h,v 1.3 2004/04/01 12:50:09 mdw Exp $
+ *
+ * Reading and writing packet buffers
  *
- * [Reading and writing packet buffers *
  * (c) 2001 Straylight/Edgeware
  */
 
@@ -29,6 +30,16 @@
 /*----- Revision history --------------------------------------------------* 
  *
  * $Log: buf.h,v $
+ * Revision 1.3  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.)
+ *
+ * Revision 1.2  2003/11/10 22:18:30  mdw
+ * Build fixes.
+ *
  * Revision 1.1  2003/10/11 21:02:33  mdw
  * Import buf stuff from tripe.
  *
@@ -37,8 +48,8 @@
  *
  */
 
-#ifndef BUF_H
-#define BUF_H
+#ifndef CATACOMB_BUF_H
+#define CATACOMB_BUF_H
 
 #ifdef __cplusplus
   extern "C" {
@@ -50,7 +61,13 @@
 
 #include <mLib/bits.h>
 
-#include <catacomb/mp.h>
+#ifndef CATACOMB_MP_H
+#  include "mp.h"
+#endif
+
+#ifndef CATACOMB_EC_H
+#  include "ec.h"
+#endif
 
 /*----- Data structures ---------------------------------------------------*/
 
@@ -252,6 +269,31 @@ extern mp *buf_getmp(buf */*b*/);
 
 extern int buf_putmp(buf */*b*/, mp */*m*/);
 
+/* --- @buf_getec@ --- *
+ *
+ * Arguments:  @buf *b@ = pointer to a buffer block
+ *             @ec *p@ = where to put the point
+ *
+ * Returns:    Zero if it worked, nonzero if it failed.
+ *
+ * Use:                Gets a multiprecision integer from a buffer.  The point must
+ *             be initialized.
+ */
+
+extern int buf_getec(buf */*b*/, ec */*p*/);
+
+/* --- @buf_putec@ --- *
+ *
+ * Arguments:  @buf *b@ = pointer to a buffer block
+ *             @ec *p@ = an elliptic curve point
+ *
+ * Returns:    Zero if it worked, nonzero if there wasn't enough space.
+ *
+ * Use:                Puts an elliptic curve point to a buffer.
+ */
+
+extern int buf_putec(buf */*b*/, ec */*p*/);
+
 /*----- That's all, folks -------------------------------------------------*/
 
 #ifdef __cplusplus