/* -*-c-*-
*
- * $Id: dh.h,v 1.7 2001/02/03 16:08:24 mdw Exp $
+ * $Id: dh.h,v 1.8 2004/04/01 12:50:09 mdw Exp $
*
* Diffie-Hellman and related public-key systems
*
/*----- Revision history --------------------------------------------------*
*
* $Log: dh.h,v $
+ * Revision 1.8 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 1.7 2001/02/03 16:08:24 mdw
* Add consistency checking for public keys.
*
/*----- Header files ------------------------------------------------------*/
+#ifndef CATACOMB_GROUP_H
+# include "group.h"
+#endif
+
#ifndef CATACOMB_GRAND_H
# include "grand.h"
#endif
# include "pgen.h"
#endif
+#ifndef CATACOMB_QDPARSE_H
+# include "qdparse.h"
+#endif
+
/*----- Data structures ---------------------------------------------------*/
-typedef struct dh_param {
- mp *p, *q; /* Prime numbers %$p$% and %$q$% */
- mp *g; /* Generates order-%$q$% subgroup */
-} dh_param;
+typedef gprime_param dh_param; /* Group parameters */
typedef struct dh_pub {
dh_param dp; /* Shared parameters */
extern int dh_checkparam(keycheck */*kc*/, const dh_param */*dp*/,
mp **/*v*/, size_t /*n*/);
+/* --- @dh_parse@ --- *
+ *
+ * Arguments: @qd_parse *qd@ = parser context
+ * @dh_param *dp@ = parameters to fill in
+ *
+ * Returns: Zero if OK, nonzero on error.
+ *
+ * Use: Parses a prime group string. This is either one of the
+ * standard group strings, or a %$p$%, %$q$%, %$g$% triple
+ * separated by commas.
+ */
+
+extern int dh_parse(qd_parse */*qd*/, dh_param */*dp*/);
+
/*----- That's all, folks -------------------------------------------------*/
#ifdef __cplusplus