X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/blobdiff_plain/5c3f75ec49019d160806489824fc76652a2ef444..02dfbd5b7af7816959dbd39c1fe628451204e35f:/group.h

diff --git a/group.h b/group.h
index 9578f33..5ea7786 100644
--- a/group.h
+++ b/group.h
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: group.h,v 1.5 2004/04/17 09:58:37 mdw Exp $
+ * $Id$
  *
  * General cyclic group abstraction
  *
@@ -80,7 +80,11 @@ typedef struct group_expfactor {
 } group_expfactor;
 
 typedef struct group_ops {
+
+  /* --- General information --- */
+
   unsigned ty;				/* Type of this group */
+  const char *name;			/* Textual name string */
 
   /* --- Memory management --- */
 
@@ -136,6 +140,9 @@ enum {
   GTY_EC				/* Elliptic curve group */
 };
 
+#define G_NAME(g)		(g)->ops->name
+#define G_TYPE(g)		(g)->ops->ty
+
 #define G_DESTROYGROUP(g)	(g)->ops->destroygroup((g))
 #define G_CREATE(g)		(g)->ops->create((g))
 #define G_COPY(g, d, x)		(g)->ops->copy((g), (d), (x))
@@ -334,6 +341,22 @@ typedef struct gprime_param {
 
 group *group_prime(const gprime_param */*gp*/);
 
+/*----- Binary field subgroups --------------------------------------------*/
+
+typedef gprime_param gbin_param;
+
+/* --- @group_binary@ --- *
+ *
+ * Arguments:	@const gbin_param *gb@ = group parameters
+ *
+ * Returns:	A pointer to the group, or null.
+ *
+ * Use:		Constructs an abstract group interface for a subgroup of a
+ *		prime field.  Group elements are @mp *@ pointers.
+ */
+
+group *group_binary(const gbin_param */*gp*/);
+
 /*----- Elliptic curve groups ---------------------------------------------*/
 
 /* --- @group_ec@ --- *