/* -*-c-*-
*
- * $Id: pgen.h,v 1.3 1999/12/10 23:29:48 mdw Exp $
+ * $Id: pgen.h,v 1.4 1999/12/22 16:01:11 mdw Exp $
*
- * Finding and testing prime numbers
+ * Prime generation glue
*
* (c) 1999 Straylight/Edgeware
*/
/*----- Revision history --------------------------------------------------*
*
* $Log: pgen.h,v $
- * Revision 1.3 1999/12/10 23:29:48 mdw
- * Change header file guard names.
- *
- * Revision 1.2 1999/11/20 22:23:05 mdw
- * Add multiply-and-add function for Diffie-Hellman safe prime generation.
- *
- * Revision 1.1 1999/11/19 13:17:57 mdw
- * Prime number generator and tester.
+ * Revision 1.4 1999/12/22 16:01:11 mdw
+ * Same file, completely different code. Main interface for new prime-
+ * search system.
*
*/
/*----- Header files ------------------------------------------------------*/
+#ifndef CATACOMB_GRAND_H
+# include "grand.h"
+#endif
+
#ifndef CATACOMB_MP_H
# include "mp.h"
#endif
-#ifndef CATACOMB_PTAB_H
-# include "ptab.h"
+#ifndef CATACOMB_PFILT_H
+# include "pfilt.h"
#endif
-/*----- Constants ---------------------------------------------------------*/
-
-#define PGEN_COMPOSITE (-1) /* Number is definitely composite */
-#define PGEN_MAYBE (0) /* Number may be prime */
-#define PGEN_PRIME (1) /* Number is definitely prime */
-
-/*----- Data structures ---------------------------------------------------*/
-
-typedef struct pgen {
- mp *m;
- unsigned char r[NPRIME];
-} pgen;
-
-/*----- Functions provided ------------------------------------------------*/
+#ifndef CATACOMB_RABIN_H
+# include "rabin.h"
+#endif
-/* --- @pgen_create@ --- *
+/*----- Event handling ----------------------------------------------------*
*
- * Arguments: @pgen *p@ = pointer to prime generation context
- * @mp *m@ = pointer to initial number to test
+ * Different programs and architectures will want to show progress of prime
+ * searches and similar processes in different ways. Of course, for simple
+ * searches, it's possible to use the @pfilt@ and @rabin@ functions and
+ * maintain control over the general control flow throughout the search.
*
- * Returns: One of the @PGEN@ constants above.
+ * For more complex cases, this sort of control is undesirable. It's
+ * possible to specify an event handler which is informed in abstract about
+ * the search. The event handler can also request the search be aborted.
+ */
+
+/* --- Event code constants --- *
*
- * Use: Tests an initial number for primality by computing its
- * residue modulo various small prime numbers. This is fairly
- * quick, but not particularly certain. If a @PGEN_MAYBE@
- * result is returned, perform Rabin-Miller tests to confirm.
+ * You're allowed to rely on the values of @PGEN_DONE@ and @PGEN_ABORT@.
*/
-extern int pgen_create(pgen */*p*/, mp */*m*/);
+enum {
+ PGEN_BEGIN = 1, /* Search for value begins */
+ PGEN_TRY, /* A new candidate has appeared */
+ PGEN_FAIL, /* The candidate failed the test */
+ PGEN_PASS, /* The candidate passed a test */
+ PGEN_DONE = 0, /* A good value has been found */
+ PGEN_ABORT = -1 /* The search has been aborted */
+};
-/* --- @pgen_destroy@ --- *
+/* --- Event information --- *
*
- * Arguments: @pgen *p@ = pointer to prime generation context
- *
- * Returns: ---
- *
- * Use: Discards a context and all the resources it holds.
+ * Note that the pseudorandom number generator supplied is not
+ * cryptographically strong.
*/
-extern void pgen_destroy(pgen */*p*/);
+typedef struct pgen_event {
+ const char *name; /* Which quantity is being found */
+ mp *m; /* Current value under test */
+ unsigned steps; /* Number of candidates left */
+ unsigned tests; /* Tests left before passing */
+ grand *r; /* Source of random numbers */
+} pgen_event;
+
+/*----- Prime search parameters -------------------------------------------*
+ *
+ * The prime search is parameterized in a large number of ways, although this
+ * isn't so much of a surprise given the different sorts of properties
+ * required from prime numbers in cryptographic applications.
+ *
+ * There are two main things which need to be configured: stepping, and
+ * testing. (Filtering is done as part of stepping.)
+ *
+ * The functions here provide a toolkit for constructing stepping and testing
+ * routines. In a lot of cases, the functions can be used directly; in
+ * others, simple bits of glue need be written.
+ *
+ * Two types of functions are defined: steppers and testers, but their
+ * interfaces are substantially similar. Each is given a request code, a
+ * context block and an event block. It is meant to update its context and
+ * the event block and return an event code.
+ *
+ * A call with a request of @PGEN_BEGIN@ asks the stepper or tester to
+ * initialize itself using the information in its event block and context. A
+ * return of @PGEN_FAIL@ reports an immediate failure; @PGEN_ABORT@ reports a
+ * fatal problem; @PGEN_DONE@ reports immediate success. @PGEN_TRY@ reports
+ * successful initialization and requests test iterations.
+ *
+ * A call to a stepper with a request of @PGEN_TRY@ asks it to step to the
+ * next possible candidate, replacing the value @m@ in the event block with
+ * the new candidate. A call to a tester with a request of @PGEN_TRY@
+ * runs one pass of the test. It should return @PGEN_FAIL@ to report a
+ * failure, @PGEN_PASS@ to report a success and request another iteration,
+ * @PGEN_DONE@ to report final acceptance and @PGEN_ABORT@ to terminate the
+ * search unsuccessfully. Note that even if the search is aborted, a
+ * shutdown request is still made.
+ *
+ * A call with a request of @PGEN_DONE@ closes down the stepper or tester.
+ * After a successful initialization (i.e., a return of something other than
+ * @PGEN_ABORT@), a shutdown call is guaranteed. The return code is ignored.
+ */
-/* --- @pgen_step@ --- *
- *
- * Arguments: @pgen *p@ = pointer to prime generation context
- * @mpw step@ = how much to step the number
+typedef int pgen_proc(int /*rq*/, pgen_event */*ev*/, void */*p*/);
+
+/*----- Simple handler functions ------------------------------------------*/
+
+/* --- @pgen_filter@ --- *
*
- * Returns: One of the @PGEN@ constants above.
+ * A prime generation context contains the information required for the
+ * simple prime filter and tester presented here.
+ */
+
+typedef struct pgen_filterctx {
+ unsigned step; /* Step size (set by client) */
+ pfilt f; /* The rapid prime filter */
+} pgen_filterctx;
+
+extern int pgen_filter(int /*rq*/, pgen_event */*ev*/, void */*p*/);
+
+/* --- @pgen_jump@ --- *
*
- * Use: Steps a number by a small amount. Stepping is much faster
- * than initializing with a new number. The test performed is
- * the same simple one used by @ptab_create@, so @PGEN_MAYBE@
- * results should be followed up by a Rabin-Miller test.
+ * Similar to the standard @pgen_filter@, but jumps in large steps rather
+ * than small ones.
*/
-extern int pgen_step(pgen */*p*/, mpw /*step*/);
+typedef struct pgen_jumpctx {
+ const pfilt *j;
+ pfilt f;
+} pgen_jumpctx;
+
+extern int pgen_jump(int /*rq*/, pgen_event */*ev*/, void */*p*/);
-/* --- @pgen_muladd@ --- *
+/* --- @pgen_test@ --- *
*
- * Arguments: @pgen *p@ = destination prime generation context
- * @const pgen *q@ = source prime generation context
- * @mpw m@ = number to multiply by
- * @mpw a@ = number to add
+ * Runs the Rabin-Miller primality test. The context block is simply a
+ * @rabin@ context.
+ */
+
+extern int pgen_test(int /*rq*/, pgen_event */*ev*/, void */*p*/);
+
+/*----- Safe prime functions ----------------------------------------------*/
+
+/* --- @pgen_safestep@ --- *
*
- * Returns: One of the @PGEN@ constants above.
+ * Steps two numbers, %$q$% and %$p = 2q + 1$%, such that neither has any
+ * small factors. %$p$% is put in the event block.
+ */
+
+typedef struct pgen_safestepctx {
+ pfilt q, p;
+} pgen_safestepctx;
+
+extern int pgen_safestep(int /*rq*/, pgen_event */*ev*/, void */*p*/);
+
+/* --- @pgen_safetest@ --- *
*
- * Use: Multiplies the number in a prime generation context by a
- * small value and then adds a small value. The destination
- * should either be uninitialized or the same as the source.
+ * Applies Rabin-Miller tests to %$p$% and %$(p - 1)/2$%.
+ */
+
+typedef struct pgen_safetestctx {
+ pgen_safestepctx c;
+ rabin q, p;
+} pgen_safetestctx;
+
+extern int pgen_safetest(int /*rq*/, pgen_event */*ev*/, void */*p*/);
+
+/*----- Standard event handlers -------------------------------------------*/
+
+/* --- @pgen_evspin@ --- *
*
- * Common things to do include multiplying by 2 and adding 0 to
- * turn a prime into a jump for finding other primes with @q@ as
- * a factor of @p - 1@, or multiplying by 2 and adding 1.
+ * Displays a spinning baton to show progress.
*/
-extern int pgen_muladd(pgen */*p*/, const pgen */*q*/, mpw /*m*/, mpw /*a*/);
+extern int pgen_evspin(int /*rq*/, pgen_event */*ev*/, void */*p*/);
-/* --- @pgen_jump@ --- *
+/* --- @pgen_ev@ --- *
*
- * Arguments: @pgen *p@ = pointer to prime generation context
- * @pgen *j@ = pointer to another generation context
+ * Traditional event handler, shows dots for each test.
+ */
+
+extern int pgen_ev(int /*rq*/, pgen_event */*ev*/, void */*p*/);
+
+/*----- The main driver ---------------------------------------------------*/
+
+/* --- @pgen@ --- *
*
- * Returns: One of the @PGEN@ constants above.
+ * Arguments: @const char *name@ = name of the value being searched for
+ * @mp *d@ = destination for resulting integer
+ * @mp *m@ = start value to pass to stepper
+ * @pgen_proc *event@ = event handler function
+ * @void *ectx@ = context argument for event andler
+ * @unsigned steps@ = number of steps to take in search
+ * @pgen_proc *step@ = stepper function to use
+ * @void *sctx@ = context argument for stepper
+ * @unsigned tests@ = number of tests to make
+ * @pgen_proc *test@ = tester function to use
+ * @void *tctx@ = context argument for tester
*
- * Use: Steps a number by a large amount. Even so, jumping is much
- * faster than initializing a new number. The test peformed is
- * the same simple one used by @ptab_create@, so @PGEN_MAYBE@
- * results should be followed up by a Rabin-Miller test.
+ * Returns: If successful, @PGEN_DONE@; otherwise @PGEN_ABORT@.
*
- * Note that the number stored in the @j@ context is probably
- * better off being even than prime. The important thing is
- * that all of the residues for the number have already been
- * computed.
+ * Use: A generalized prime-number search skeleton. Yes, that's a
+ * scary number of arguments.
*/
-extern int pgen_jump(pgen */*p*/, pgen */*j*/);
+extern mp *pgen(const char */*name*/, mp */*d*/, mp */*m*/,
+ pgen_proc */*event*/, void */*ectx*/,
+ unsigned /*steps*/, pgen_proc */*step*/, void */*sctx*/,
+ unsigned /*tests*/, pgen_proc */*test*/, void */*tctx*/);
/*----- That's all, folks -------------------------------------------------*/
projects / u / mdw / catacomb / blobdiff