X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~mdw/git/tripe/blobdiff_plain/e6b06b6b61b4b877937d4a56ba704d3f18154dc2..786989941b7b4504f0234c4a318f929802e981ad:/chal.c

diff --git a/chal.c b/chal.c
deleted file mode 100644
index 5258cf9c..00000000
--- a/chal.c
+++ /dev/null
@@ -1,139 +0,0 @@
-/* -*-c-*-
- *
- * $Id$
- *
- * Cryptographic challenges
- *
- * (c) 2005 Straylight/Edgeware
- */
-
-/*----- Licensing notice --------------------------------------------------* 
- *
- * This file is part of Trivial IP Encryption (TrIPE).
- *
- * TrIPE is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- * 
- * TrIPE 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 General Public License for more details.
- * 
- * You should have received a copy of the GNU General Public License
- * along with TrIPE; if not, write to the Free Software Foundation,
- * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- */
-
-/*----- Header files ------------------------------------------------------*/
-
-#include "tripe.h"
-
-/*----- Static variables --------------------------------------------------*/
-
-static gmac *mac;
-static uint32 oseq;
-static seqwin iseq;
-
-/*----- Main code ---------------------------------------------------------*/
-
-/* --- @c_genkey@ --- *
- *
- * Arguments:	---
- *
- * Returns:	---
- *
- * Use:		Generates a new challenge key.
- */
-
-static void c_genkey(void)
-{
-  if (mac && GM_CLASS(mac) == algs.m && oseq < 0x07ffffff) return;
-  if (mac) GM_DESTROY(mac);
-  assert(algs.mksz < sizeof(buf_t));
-  rand_get(RAND_GLOBAL, buf_t, algs.mksz);
-  mac = GM_KEY(algs.m, buf_t, algs.mksz);
-  oseq = 0;
-  seq_reset(&iseq);
-  IF_TRACING(T_CHAL, {
-    trace(T_CHAL, "chal: generated new challenge key");
-    trace_block(T_CRYPTO, "chal: new key", buf_t, algs.mksz);
-  })
-}
-
-/* --- @c_new@ --- *
- *
- * Arguments:	@buf *b@ = where to put the challenge
- *
- * Returns:	Zero if OK, nonzero on error.
- *
- * Use:		Issues a new challenge.
- */
-
-int c_new(buf *b)
-{
-  octet *p;
-  ghash *h;
-
-  c_genkey();
-  p = BCUR(b);
-  if (buf_putu32(b, oseq++)) return (-1);
-  h = GM_INIT(mac);
-  GH_HASH(h, p, BCUR(b) - p);
-  buf_put(b, GH_DONE(h, 0), algs.tagsz);
-  GH_DESTROY(h);
-  if (BBAD(b)) return (-1);
-  IF_TRACING(T_CHAL, {
-    trace(T_CHAL, "chal: issuing challenge %lu", (unsigned long)(oseq - 1));
-    trace_block(T_CRYPTO, "chal: challenge block", p, BCUR(b) - p);
-  })
-  return (0);
-}
-
-/* --- @c_check@ --- *
- *
- * Arguments:	@buf *b@ = where to find the challenge
- *
- * Returns:	Zero if OK, nonzero if it didn't work.
- *
- * Use:		Checks a challenge.  On failure, the buffer is broken.
- */
-
-int c_check(buf *b)
-{
-  const octet *p;
-  size_t sz = 4 + algs.tagsz;
-  uint32 seq;
-  ghash *h;
-  int ok;
-
-  if ((p = buf_get(b, sz)) == 0) {
-    a_warn("CHAL", "invalid-challenge", A_END);
-    goto fail;
-  }
-  IF_TRACING(T_CHAL, trace_block(T_CRYPTO, "chal: check challenge", p, sz); )
-  if (!mac) {
-    a_warn("CHAL", "impossible-challenge", A_END);
-    goto fail;
-  }
-  h = GM_INIT(mac);
-  GH_HASH(h, p, 4);
-  ok = (memcmp(GH_DONE(h, 0), p + 4, algs.tagsz) == 0);
-  GH_DESTROY(h);
-  if (!ok) {
-    a_warn("CHAL", "incorrect-tag", A_END);
-    goto fail;
-  }
-  seq = LOAD32(p);
-  if (seq_check(&iseq, LOAD32(p), "CHAL"))
-    goto fail;
-  T( trace(T_CHAL, "chal: checked challenge %lu", (unsigned long)seq); )
-  return (0);
-
-fail:
-  buf_break(b);
-  return (-1);
-}
-
-/*----- That's all, folks -------------------------------------------------*/