3 * $Id: pgen.h,v 1.6 2000/06/17 11:52:12 mdw Exp $
5 * Prime generation glue
7 * (c) 1999 Straylight/Edgeware
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of Catacomb.
14 * Catacomb is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU Library General Public License as
16 * published by the Free Software Foundation; either version 2 of the
17 * License, or (at your option) any later version.
19 * Catacomb is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU Library General Public License for more details.
24 * You should have received a copy of the GNU Library General Public
25 * License along with Catacomb; if not, write to the Free
26 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
30 /*----- Revision history --------------------------------------------------*
33 * Revision 1.6 2000/06/17 11:52:12 mdw
36 * Revision 1.5 2000/02/12 18:21:03 mdw
37 * Overhaul of key management (again).
39 * Revision 1.4 1999/12/22 16:01:11 mdw
40 * Same file, completely different code. Main interface for new prime-
45 #ifndef CATACOMB_PGEN_H
46 #define CATACOMB_PGEN_H
52 /*----- Header files ------------------------------------------------------*/
54 #ifndef CATACOMB_GRAND_H
62 #ifndef CATACOMB_PFILT_H
66 #ifndef CATACOMB_RABIN_H
70 /*----- Event handling ----------------------------------------------------*
72 * Different programs and architectures will want to show progress of prime
73 * searches and similar processes in different ways. Of course, for simple
74 * searches, it's possible to use the @pfilt@ and @rabin@ functions and
75 * maintain control over the general control flow throughout the search.
77 * For more complex cases, this sort of control is undesirable. It's
78 * possible to specify an event handler which is informed in abstract about
79 * the search. The event handler can also request the search be aborted.
82 /* --- Event code constants --- *
84 * You're allowed to rely on the values of @PGEN_DONE@ and @PGEN_ABORT@.
88 PGEN_BEGIN
= 1, /* Search for value begins */
89 PGEN_TRY
, /* A new candidate has appeared */
90 PGEN_FAIL
, /* The candidate failed the test */
91 PGEN_PASS
, /* The candidate passed a test */
92 PGEN_DONE
= 0, /* A good value has been found */
93 PGEN_ABORT
= -1 /* The search has been aborted */
96 /* --- Event information --- *
98 * Note that the pseudorandom number generator supplied is not
99 * cryptographically strong.
102 typedef struct pgen_event
{
103 const char *name
; /* Which quantity is being found */
104 mp
*m
; /* Current value under test */
105 unsigned steps
; /* Number of candidates left */
106 unsigned tests
; /* Tests left before passing */
107 grand
*r
; /* Source of random numbers */
110 /*----- Prime search parameters -------------------------------------------*
112 * The prime search is parameterized in a large number of ways, although this
113 * isn't so much of a surprise given the different sorts of properties
114 * required from prime numbers in cryptographic applications.
116 * There are two main things which need to be configured: stepping, and
117 * testing. (Filtering is done as part of stepping.)
119 * The functions here provide a toolkit for constructing stepping and testing
120 * routines. In a lot of cases, the functions can be used directly; in
121 * others, simple bits of glue need be written.
123 * Two types of functions are defined: steppers and testers, but their
124 * interfaces are substantially similar. Each is given a request code, a
125 * context block and an event block. It is meant to update its context and
126 * the event block and return an event code.
128 * A call with a request of @PGEN_BEGIN@ asks the stepper or tester to
129 * initialize itself using the information in its event block and context. A
130 * return of @PGEN_FAIL@ reports an immediate failure; @PGEN_ABORT@ reports a
131 * fatal problem; @PGEN_DONE@ reports immediate success. @PGEN_TRY@ reports
132 * successful initialization and requests test iterations.
134 * A call to a stepper with a request of @PGEN_TRY@ asks it to step to the
135 * next possible candidate, replacing the value @m@ in the event block with
136 * the new candidate. A call to a tester with a request of @PGEN_TRY@
137 * runs one pass of the test. It should return @PGEN_FAIL@ to report a
138 * failure, @PGEN_PASS@ to report a success and request another iteration,
139 * @PGEN_DONE@ to report final acceptance and @PGEN_ABORT@ to terminate the
140 * search unsuccessfully. Note that even if the search is aborted, a
141 * shutdown request is still made.
143 * A call with a request of @PGEN_DONE@ closes down the stepper or tester.
144 * After a successful initialization (i.e., a return of something other than
145 * @PGEN_ABORT@), a shutdown call is guaranteed. The return code is ignored.
148 typedef int pgen_proc(int /*rq*/, pgen_event */
*ev*/
, void */
*p*/
);
150 /*----- Simple handler functions ------------------------------------------*/
152 /* --- @pgen_filter@ --- *
154 * A prime generation context contains the information required for the
155 * simple prime filter and tester presented here.
158 typedef struct pgen_filterctx
{
159 unsigned step
; /* Step size (set by client) */
160 pfilt f
; /* The rapid prime filter */
163 extern int pgen_filter(int /*rq*/, pgen_event */
*ev*/
, void */
*p*/
);
165 /* --- @pgen_jump@ --- *
167 * Similar to the standard @pgen_filter@, but jumps in large steps rather
171 typedef struct pgen_jumpctx
{
176 extern int pgen_jump(int /*rq*/, pgen_event */
*ev*/
, void */
*p*/
);
178 /* --- @pgen_test@ --- *
180 * Runs the Rabin-Miller primality test. The context block is simply a
184 extern int pgen_test(int /*rq*/, pgen_event */
*ev*/
, void */
*p*/
);
186 /*----- Safe prime functions ----------------------------------------------*/
188 /* --- @pgen_safestep@ --- *
190 * Steps two numbers, %$q$% and %$p = 2q + 1$%, such that neither has any
191 * small factors. %$p$% is put in the event block.
194 typedef struct pgen_safestepctx
{
198 extern int pgen_safestep(int /*rq*/, pgen_event */
*ev*/
, void */
*p*/
);
200 /* --- @pgen_safejump@ --- *
202 * Jumps two numbers, %$q$% and %$p = 2q + 1$% such that neither has any
206 typedef struct pgen_safejumpctx
{
211 extern int pgen_safejump(int /*rq*/, pgen_event */
*ev*/
, void */
*p*/
);
213 /* --- @pgen_safetest@ --- *
215 * Applies Rabin-Miller tests to %$p$% and %$(p - 1)/2$%.
218 typedef struct pgen_safetestctx
{
223 extern int pgen_safetest(int /*rq*/, pgen_event */
*ev*/
, void */
*p*/
);
225 /*----- Miscellaneous steppers and testers --------------------------------*/
227 typedef struct pgen_gcdstepctx
{
228 pfilt p
, jp
; /* Prime filter and step filter */
229 mp
*q
, *jq
; /* %$p - 1$%, and a step value*/
230 mp
*r
; /* Other argument for GCD */
231 mp
*g
; /* GCD output (must be inited) */
232 mp
*max
; /* Maximum permissible GCD */
235 /* --- @pgen_gcdstep@ --- *
237 * Steps @p@ and @q@, until @p@ has no small factors, and
238 * %$\gcd(p, r) \le max$%.
241 extern int pgen_gcdstep(int /*rq*/, pgen_event */
*ev*/
, void */
*p*/
);
243 /*----- Standard event handlers -------------------------------------------*/
245 /* --- @pgen_evspin@ --- *
247 * Displays a spinning baton to show progress.
250 extern int pgen_evspin(int /*rq*/, pgen_event */
*ev*/
, void */
*p*/
);
252 /* --- @pgen_ev@ --- *
254 * Traditional event handler, shows dots for each test.
257 extern int pgen_ev(int /*rq*/, pgen_event */
*ev*/
, void */
*p*/
);
259 /*----- The main driver ---------------------------------------------------*/
263 * Arguments: @const char *name@ = name of the value being searched for
264 * @mp *d@ = destination for resulting integer
265 * @mp *m@ = start value to pass to stepper
266 * @pgen_proc *event@ = event handler function
267 * @void *ectx@ = context argument for event andler
268 * @unsigned steps@ = number of steps to take in search
269 * @pgen_proc *step@ = stepper function to use
270 * @void *sctx@ = context argument for stepper
271 * @unsigned tests@ = number of tests to make
272 * @pgen_proc *test@ = tester function to use
273 * @void *tctx@ = context argument for tester
275 * Returns: If successful, @PGEN_DONE@; otherwise @PGEN_ABORT@.
277 * Use: A generalized prime-number search skeleton. Yes, that's a
278 * scary number of arguments.
281 extern mp
*pgen(const char */
*name*/
, mp */
*d*/
, mp */
*m*/
,
282 pgen_proc */
*event*/
, void */
*ectx*/
,
283 unsigned /*steps*/, pgen_proc */
*step*/
, void */
*sctx*/
,
284 unsigned /*tests*/, pgen_proc */
*test*/
, void */
*tctx*/
);
286 /*----- That's all, folks -------------------------------------------------*/