Overhaul of key management (again).

[u/mdw/catacomb] / dh.h

diff --git a/dh.h b/dh.h
index bf8d79a..465f59f 100644 (file)
--- a/dh.h
+++ b/dh.h
@@ -1,8 +1,9 @@
 /* -*-c-*-
  *
- * $Id: dh.h,v 1.2 1999/12/10 23:29:48 mdw Exp $
+ * $Id: dh.h,v 1.3 2000/02/12 18:21:02 mdw Exp $
+ *
+ * Diffie-Hellman and related public-key systems
  *
- * [Diffie-Hellman key negotiation *
  * (c) 1999 Straylight/Edgeware
  */
 
@@ -29,11 +30,8 @@
 /*----- Revision history --------------------------------------------------* 
  *
  * $Log: dh.h,v $
- * Revision 1.2  1999/12/10 23:29:48  mdw
- * Change header file guard names.
- *
- * Revision 1.1  1999/11/20 22:24:44  mdw
- * Add Diffie-Hellman support.
+ * Revision 1.3  2000/02/12 18:21:02  mdw
+ * Overhaul of key management (again).
  *
  */
 
@@ -46,40 +44,50 @@
 
 /*----- Header files ------------------------------------------------------*/
 
-#ifndef CATACOMB_MP_H
-#  include "mp.h"
+#ifndef CATACOMB_GRAND_H
+#  include "grand.h"
 #endif
 
-/*----- Event codes -------------------------------------------------------*/
+#ifndef CATACOMB_PGEN_H
+#  include "pgen.h"
+#endif
 
-enum {
-  DHEV_OK,
+/*----- Data structures ---------------------------------------------------*/
 
-  DHEV_FAIL,
-  DHEV_PASS
-};
+typedef struct dh_param {
+  mp *p, *q;
+  mp *g;
+} dh_param;
 
 /*----- Functions provided ------------------------------------------------*/
 
-/* --- @dh_prime@ --- *
+/* --- @dh_gen@ --- *
  *
- * Arguments:  @mp *s@ = start point for search (must be odd)
- *             @size_t n@ = number of concerted attempts to make, or zero
- *             @void (*proc)(int ev, void *p)@ = event handler
- *             @void *p@ = argument for event handler
+ * Arguments:  @dh_param *dp@ = pointer to output parameter block
+ *             @unsigned ql@ = length of %$q$% in bits, or zero
+ *             @unsigned pl@ = length of %$p$% in bits
+ *             @unsigned steps@ = number of steps to go
+ *             @grand *r@ = random number source
+ *             @pgen_proc *event@ = event handler function
+ *             @void *ectx@ = argument for the event handler
  *
- * Returns:    A prime number %$p$% where %$p = 2q + 1$% for prime %$q$%.
+ * Returns:    @PGEN_DONE@ if it worked, @PGEN_ABORT@ if it didn't.
  *
- * Use:                Finds a safe prime by sequential search from a given starting
- *             point.  If it fails, a null pointer is returned.
+ * Use:                Generates Diffie-Hellman parameters.
  *
- *             The event handler is informed of the progress of the search.
- *             It may abort the search at any time by returning a nonzero
- *             value.
+ *             The parameters are a prime %$q$%, relatively small, and a
+ *             large prime %$p = kq + 1$% for some %$k$%, together with a
+ *             generator %$g$% of the cyclic subgroup of order %$q$%.  These
+ *             are actually the same as the DSA parameter set, but the
+ *             generation algorithm is different.  Also, if @ql@ is zero,
+ *             this algorithm forces %$k = 2$%, and chooses %$g = 4$%.  Make
+ *             sure you have something interesting to do if you choose this
+ *             option.
  */
 
-extern mp *dh_prime(mp */*s*/, size_t /*n*/,
-                   int (*proc)(int /*ev*/, void */*p*/), void */*p*/);
+extern int dh_gen(dh_param */*dp*/, unsigned /*ql*/, unsigned /*pl*/,
+                 unsigned /*steps*/, grand */*r*/, pgen_proc */*event*/,
+                 void */*ectx*/);
 
 /*----- That's all, folks -------------------------------------------------*/