X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/blobdiff_plain/ba6e6b64033b1f9de49feccb5c9cd438354481f7..0f00dc4c8eb47e67bc0f148c2dd109f73a451e0a:/pub/dh-param.c

diff --git a/pub/dh-param.c b/pub/dh-param.c
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+/* -*-c-*-
+ *
+ * Reading Diffie-Hellman parameters
+ *
+ * (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 "dh.h"
+#include "ptab.h"
+#include "bintab.h"
+
+/*----- Main code ---------------------------------------------------------*/
+
+/* ---- @dh_infofromdata@ --- *
+ *
+ * Arguments:	@dh_param *dp@ = parameters to fill in
+ *		@pdata *pd@ = packed data structure
+ *
+ * Returns:	---
+ *
+ * Use:		Fills in a parameters structure from a packed data block.
+ */
+
+void dh_infofromdata(dh_param *dp, pdata *pd)
+  { dp->p = &pd->p; dp->q = &pd->q; dp->g = &pd->g; }
+
+/* --- @dh_parse@, @dhbin_parse@ --- *
+ *
+ * Arguments:	@qd_parse *qd@ = parser context
+ *		@dh_param *dp@ = parameters to fill in
+ *
+ * Returns:	Zero if OK, nonzero on error.
+ *
+ * Use:		Parses a prime group string.  This is either one of the
+ *		standard group strings, or a %$p$%, %$q$%, %$g$% triple
+ *		separated by commas.
+ */
+
+static int parse(qd_parse *qd, gprime_param *dp)
+{
+  mp *p = MP_NEW, *q = MP_NEW, *g = MP_NEW;
+
+  if ((p = qd_getmp(qd)) == 0) goto fail;
+  qd_delim(qd, ','); if ((q = qd_getmp(qd)) == 0) goto fail;
+  qd_delim(qd, ','); if ((g = qd_getmp(qd)) == 0) goto fail;
+  dp->p = p; dp->q = q; dp->g = g;
+  return (0);
+fail:
+  mp_drop(p); mp_drop(q); mp_drop(g);
+  return (-1);
+}
+
+int dh_parse(qd_parse *qd, dh_param *dp)
+{
+  const pentry *pe;
+
+  for (pe = ptab; pe->name; pe++) {
+    if (qd_enum(qd, pe->name) >= 0) {
+      dh_infofromdata(dp, pe->data);
+      goto found;
+    }
+  }
+  if (parse(qd, dp))
+    return (-1);
+found:
+  return (0);
+}
+
+int dhbin_parse(qd_parse *qd, gbin_param *gb)
+{
+  const binentry *be;
+
+  for (be = bintab; be->name; be++) {
+    if (qd_enum(qd, be->name) >= 0) {
+      dh_infofromdata(gb, be->data);
+      goto found;
+    }
+  }
+  if (parse(qd, gb))
+    return (-1);
+found:
+  return (0);
+}
+
+/*----- Test rig ----------------------------------------------------------*/
+
+#ifdef TEST_RIG
+
+#include "fibrand.h"
+
+int main(int argc, char *argv[])
+{
+  const pentry *pe;
+  const binentry *be;
+  const char *e;
+  int ok = 1, aok = 1;
+  grand *gr;
+
+  gr = fibrand_create(0);
+  fputs("checking standard prime groups:", stdout);
+  fflush(stdout);
+  for (pe = ptab; pe->name; pe++) {
+    dh_param dp;
+    group *g;
+    dh_infofromdata(&dp, pe->data);
+    g = group_prime(&dp);
+    if (mp_bits(dp.p) > 2048 &&
+	(!argv[1] || strcmp(argv[1], "keen") != 0)) {
+      printf(" [%s skipped]", pe->name);
+      fflush(stdout);
+      continue;
+    }
+    e = G_CHECK(g, gr);
+    G_DESTROYGROUP(g);
+    dh_paramfree(&dp);
+    if (e) {
+      printf(" [%s failed: %s]", pe->name, e);
+      ok = aok = 0;
+    } else
+      printf(" %s", pe->name);
+    fflush(stdout);
+  }
+  fputs(ok ? " ok\n" : " failed\n", stdout);
+  ok = 1;
+  fputs("checking standard binary groups:", stdout);
+  for (be = bintab; be->name; be++) {
+    gbin_param gb;
+    group *g;
+    dh_infofromdata(&gb, be->data);
+    g = group_binary(&gb);
+    e = G_CHECK(g, gr);
+    G_DESTROYGROUP(g);
+    dh_paramfree(&gb);
+    if (e) {
+      printf(" [%s failed: %s]", be->name, e);
+      ok = aok = 0;
+    } else
+      printf(" %s", be->name);
+    fflush(stdout);
+  }
+  fputs(ok ? " ok\n" : " failed\n", stdout);
+  gr->ops->destroy(gr);
+  return (!aok);
+}
+
+#endif
+
+/*----- That's all, folks -------------------------------------------------*/