+++ /dev/null
-/* -*-c-*-
- *
- * $Id$
- *
- * Abstraction for elliptic curve groups
- *
- * (c) 2004 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 <ctype.h>
-
-#include <mLib/sub.h>
-
-#define ge ec
-#include "group.h"
-#include "ec-raw.h"
-#include "group-guts.h"
-
-/*----- Main code ---------------------------------------------------------*/
-
-/* --- Group operations --- */
-
-static void gdestroygroup(group *gg) {
- gctx_ec *g = (gctx_ec *)gg;
- EC_DESTROY(&g->gen);
- ec_freeinfo(&g->ei);
- DESTROY(g);
-}
-
-static ec *gcreate(group *gg)
- { ec *x = CREATE(ec); EC_CREATE(x); return (x); }
-
-static void gcopy(group *gg, ec *d, ec *x) { EC_COPY(d, x); }
-
-static void gburn(group *gg, ec *x) { if (x->x) (x->x)->f |= MP_BURN; }
-
-static void gdestroy(group *gg, ec *x) { EC_DESTROY(x); DESTROY(x); }
-
-static int gsamep(group *gg, group *hh) {
- gctx_ec *g = (gctx_ec *)gg, *h = (gctx_ec *)hh;
- return (ec_sameinfop(&g->ei, &h->ei));
-}
-
-static int geq(group *gg, ec *x, ec *y) {
- gctx_ec *g = (gctx_ec *)gg; EC_FIX(g->ei.c, x, x); EC_FIX(g->ei.c, y, y);
- return (EC_EQ(x, y));
-}
-
-static int gidentp(group *gg, ec *x) { return (EC_ATINF(x)); }
-
-static const char *gcheck(group *gg, grand *gr)
- { gctx_ec *g = (gctx_ec *)gg; return (ec_checkinfo(&g->ei, gr)); }
-
-static void gmul(group *gg, ec *d, ec *x, ec *y)
- { gctx_ec *g = (gctx_ec *)gg; EC_ADD(g->ei.c, d, x, y); }
-
-static void gsqr(group *gg, ec *d, ec *x)
- { gctx_ec *g = (gctx_ec *)gg; EC_DBL(g->ei.c, d, x); }
-
-static void ginv(group *gg, ec *d, ec *x)
- { gctx_ec *g = (gctx_ec *)gg; EC_NEG(g->ei.c, d, x); }
-
-static void gdiv(group *gg, ec *d, ec *x, ec *y)
- { gctx_ec *g = (gctx_ec *)gg; EC_SUB(g->ei.c, d, x, y); }
-
-static void gexp(group *gg, ec *d, ec *x, mp *n)
- { gctx_ec *g = (gctx_ec *)gg; ec_imul(g->ei.c, d, x, n); }
-
-static void gmexp(group *gg, ec *d, const group_expfactor *f, size_t n) {
- gctx_ec *g = (gctx_ec *)gg; size_t i;
- ec_mulfactor *ff = xmalloc(n * sizeof(ec_mulfactor));
- for (i = 0; i < n; i++) { ff[i].base = *f[i].base; ff[i].exp = f[i].exp; }
- ec_immul(g->ei.c, d, ff, n); xfree(ff);
-}
-
-static int gread(group *gg, ec *d, const mptext_ops *ops, void *p) {
- gctx_ec *g = (gctx_ec *)gg;
- ec t = EC_INIT;
- int rc = -1;
- int ch;
-
- ch = ops->get(p);
- if (tolower(ch) == 'i') {
- if (tolower(ops->get(p)) != 'n' || tolower(ops->get(p)) != 'f')
- return (-1);
- EC_SETINF(d);
- return (0);
- }
- ops->unget(ch, p);
- if ((t.x = mp_read(MP_NEW, 0, ops, p)) == 0) goto done;
- do ch = ops->get(p); while (ch == ',' || isspace(ch)); ops->unget(ch, p);
- if ((t.y = mp_read(MP_NEW, 0, ops, p)) == 0) goto done;
- EC_IN(g->ei.c, &t, &t);
- if (EC_CHECK(g->ei.c, &t)) goto done;
- EC_COPY(d, &t); rc = 0;
- EC_DESTROY(&t);
-done:
- return (rc);
-}
-
-static int gwrite(group *gg, ec *x, const mptext_ops *ops, void *p) {
- gctx_ec *g = (gctx_ec *)gg; int rc = -1; ec t = EC_INIT;
- EC_OUT(g->ei.c, &t, x); if (EC_ATINF(&t)) rc = ops->put("inf", 3, p);
- else if (!ops->put("0x", 2, p) && !mp_write(t.x, 16, ops, p) &&
- !ops->put(", 0x", 4, p) && !mp_write(t.y, 16, ops, p)) rc = 0;
- EC_DESTROY(&t); return (rc);
-}
-
-static mp *gtoint(group *gg, mp *d, ec *x) {
- gctx_ec *g = (gctx_ec *)gg; ec t = EC_INIT; mp *i; if (EC_ATINF(x)) i = 0;
- else { EC_OUT(g->ei.c, &t, x); i = MP_COPY(t.x); EC_DESTROY(&t); }
- mp_drop(d); return (i);
-}
-
-static int gfromint(group *gg, ec *d, mp *x) {
- gctx_ec *g = (gctx_ec *)gg; ec t = EC_INIT;
- if (!ec_find(g->ei.c, &t, x)) return (-1);
- EC_IN(g->ei.c, d, &t); EC_DESTROY(&t); return (0);
-}
-
-static int gtoec(group *gg, ec *d, ec *x)
- { gctx_ec *g = (gctx_ec *)gg; EC_OUT(g->ei.c, d, x); return (0); }
-
-static int gfromec(group *gg, ec *d, const ec *x) {
- gctx_ec *g = (gctx_ec *)gg; ec t = EC_INIT; int rc; EC_IN(g->ei.c, &t, x);
- rc = EC_CHECK(g->ei.c, &t); if (!rc) EC_COPY(d, &t); EC_DESTROY(&t);
- return (rc);
-}
-
-static int gtobuf(group *gg, buf *b, ec *x) {
- gctx_ec *g = (gctx_ec *)gg; ec t = EC_INIT; int rc;
- EC_OUT(g->ei.c, &t, x); rc = buf_putec(b, &t); EC_DESTROY(&t); return (rc);
-}
-
-static int gfrombuf(group *gg, buf *b, ec *d) {
- gctx_ec *g = (gctx_ec *)gg; ec t = EC_INIT; int rc;
- if (buf_getec(b, &t)) return (-1);
- EC_IN(g->ei.c, &t, &t); rc = EC_CHECK(g->ei.c, &t);
- if (!rc) EC_COPY(d, &t); EC_DESTROY(&t); return (rc);
-}
-
-static int gtoraw(group *gg, buf *b, ec *x) {
- gctx_ec *g = (gctx_ec *)gg; ec t = EC_INIT; int rc;
- EC_OUT(g->ei.c, &t, x); rc = ec_putraw(g->ei.c, b, &t);
- EC_DESTROY(&t); return (rc);
-}
-
-static int gfromraw(group *gg, buf *b, ec *d) {
- gctx_ec *g = (gctx_ec *)gg; ec t = EC_INIT; int rc;
- if (ec_getraw(g->ei.c, b, &t)) return (-1);
- EC_IN(g->ei.c, &t, &t); rc = EC_CHECK(g->ei.c, &t);
- if (!rc) EC_COPY(d, &t); EC_DESTROY(&t); return (rc);
-}
-
-/* --- @group_ec@ --- *
- *
- * Arguments: @const ec_info *ei@ = elliptic curve parameters
- *
- * Returns: A pointer to the group.
- *
- * Use: Constructs an abstract group interface for an elliptic curve
- * group. Group elements are @ec@ structures. The contents of
- * the @ec_info@ structure becomes the property of the @group@
- * object; you can (and should) free the structure itself, but
- * calling @ec_freeinfo@ on it is not allowed.
- */
-
-static const group_ops gops = {
- GTY_EC, "ec",
- gdestroygroup, gcreate, gcopy, gburn, gdestroy,
- gsamep, geq, gidentp,
- gcheck,
- gmul, gsqr, ginv, gdiv, gexp, gmexp,
- gread, gwrite,
- gtoint, gfromint, gtoec, gfromec, gtobuf, gfrombuf, gtoraw, gfromraw
-};
-
-group *group_ec(const ec_info *ei)
-{
- gctx_ec *g = CREATE(gctx_ec);
-
- g->g.ops = &gops;
- g->g.nbits = ei->c->f->nbits * 2;
- g->g.noctets = ei->c->f->noctets * 2 + 1;
- g->ei = *ei;
- EC_CREATE(&g->id);
- g->g.i = &g->id;
- EC_CREATE(&g->gen);
- g->g.g = &g->gen;
- EC_IN(g->ei.c, &g->gen, &ei->g);
- g->g.r = ei->r;
- g->g.h = ei->h;
- return (&g->g);
-}
-
-/*----- That's all, folks -------------------------------------------------*/
projects / u / mdw / catacomb / blobdiff