X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/blobdiff_plain/ba6e6b64033b1f9de49feccb5c9cd438354481f7..0f00dc4c8eb47e67bc0f148c2dd109f73a451e0a:/dh-gen.c?ds=sidebyside

diff --git a/dh-gen.c b/dh-gen.c
deleted file mode 100644
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-/* -*-c-*-
- *
- * $Id: dh-gen.c,v 1.3 2004/04/08 01:36:15 mdw Exp $
- *
- * Generate Diffie-Hellman parameters
- *
- * (c) 1999 Straylight/Edgeware
- */
-
-/*----- Licensing notice --------------------------------------------------*
- *
- * This file is part of Catacomb.
- *
- * Catacomb is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Library General Public License as
- * published by the Free Software Foundation; either version 2 of the
- * License, or (at your option) any later version.
- *
- * Catacomb is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public
- * License along with Catacomb; if not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
- * MA 02111-1307, USA.
- */
-
-/*----- Header files ------------------------------------------------------*/
-
-#include <mLib/macros.h>
-
-#include "dh.h"
-#include "grand.h"
-#include "mp.h"
-#include "mpmont.h"
-#include "mprand.h"
-#include "pfilt.h"
-#include "pgen.h"
-#include "prim.h"
-#include "rabin.h"
-
-/*----- Main code ---------------------------------------------------------*/
-
-/* --- @dh_gen@ --- *
- *
- * 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:	@PGEN_DONE@ if it worked, @PGEN_ABORT@ if it didn't.
- *
- * Use:		Generates Diffie-Hellman parameters.
- *
- *		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.
- */
-
-int dh_gen(dh_param *dp, unsigned ql, unsigned pl, unsigned steps, grand *r,
-	   pgen_proc *event, void *ectx)
-{
-  /* --- If @ql@ is zero, do the time consuming safe-prime thing --- */
-
-  if (!ql) {
-    pgen_simulprime sp[2];
-    pgen_simulctx ss;
-
-    mp *m = mprand(MP_NEW, pl - 1, r, 1);
-    ss.step = MP_TWO;
-    sp[0].mul = MP_ONE; sp[0].add = MP_ZERO; sp[0].f = 0;
-    sp[1].mul = MP_TWO; sp[1].add = MP_ONE; sp[1].f = PGENF_KEEP;
-    ss.v = sp; ss.n = N(sp);
-    dp->q = pgen("p", MP_NEW, m, event, ectx, steps, pgen_simulstep, &ss,
-		 rabin_iters(pl), pgen_simultest, &ss);
-    mp_drop(m);
-    if (!dp->q) {
-      mp_drop(sp[1].u.x);
-      return (PGEN_ABORT);
-    }
-    dp->p = sp[1].u.x;
-    dp->g = MP_FOUR;
-    return (PGEN_DONE);
-  }
-
-  /* --- Otherwise the job is much simpler --- *
-   *
-   * But doesn't look it...
-   */
-
-  else {
-    pgen_filterctx c;
-    pgen_jumpctx j;
-    rabin rb;
-    prim_ctx p;
-    int i;
-    mp *m = MP_NEW;
-    mp *x, *y;
-
-    /* --- Generate @q@ first --- */
-
-    c.step = 2;
-    m = mprand(MP_NEW, ql, r, 1);
-    dp->q = pgen("q", MP_NEW, m, event, ectx, steps, pgen_filter, &c,
-		 rabin_iters(ql), pgen_test, &rb);
-    if (!dp->q)
-      goto fail_q;
-
-    /* --- Now pick a suitable @p@ --- */
-
-    m = mp_lsl(m, dp->q, 1);
-    x = mprand(MP_NEW, pl, r, 0);
-    y = MP_NEW; mp_div(0, &y, x, m);
-    x = mp_sub(x, x, y);
-    x = mp_add(x, x, MP_ONE);
-    mp_drop(y);
-    pfilt_create(&c.f, m);
-    j.j = &c.f;
-    dp->p = pgen("p", MP_NEW, x, event, ectx, steps, pgen_jump, &j,
-		 rabin_iters(pl), pgen_test, &rb);
-    pfilt_destroy(&c.f);
-    mp_drop(x);
-    if (!dp->p)
-      goto fail_p;
-
-    /* --- And finally a suitable @g@ --- */
-
-    mpmont_create(&p.mm, dp->p);
-    mp_div(&m, 0, dp->p, dp->q);
-    i = 0;
-    p.exp = m;
-    p.n = 0;
-    dp->g = pgen("g", MP_NEW, MP_NEW, event, ectx, 0, prim_step, &i,
-		 1, prim_test, &p);
-    mpmont_destroy(&p.mm);
-    if (!dp->g)
-      goto fail_g;
-    mp_drop(m);
-    return (PGEN_DONE);
-
-    /* --- Tidy up --- */
-
-  fail_g:
-    mp_drop(dp->q);
-  fail_q:
-    mp_drop(dp->p);
-  fail_p:
-    mp_drop(m);
-    return (PGEN_ABORT);
-  }
-}
-
-/*----- That's all, folks -------------------------------------------------*/