X-Git-Url: https://git.distorted.org.uk/~mdw/catacomb/blobdiff_plain/ba6e6b64033b1f9de49feccb5c9cd438354481f7..0f00dc4c8eb47e67bc0f148c2dd109f73a451e0a:/tea.c

diff --git a/tea.c b/tea.c
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--- a/tea.c
+++ /dev/null
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-/* -*-c-*-
- *
- * $Id: tea.c,v 1.3 2004/04/08 01:36:15 mdw Exp $
- *
- * The Tiny Encryption Algorithm
- *
- * (c) 2000 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/bits.h>
-
-#include "blkc.h"
-#include "gcipher.h"
-#include "paranoia.h"
-#include "tea.h"
-
-/*----- Global variables --------------------------------------------------*/
-
-const octet tea_keysz[] = { KSZ_RANGE, TEA_KEYSZ, 0, 16, 1 };
-
-/*----- Main code ---------------------------------------------------------*/
-
-/* --- @tea_init@ --- *
- *
- * Arguments:	@tea_ctx *k@ = pointer to key block
- *		@const void *buf@ = pointer to key buffer
- *		@size_t sz@ = size of key material
- *
- * Returns:	---
- *
- * Use:		Initializes a TEA key buffer.  The key buffer must be 16
- *		bytes long.
- */
-
-void tea_init(tea_ctx *k, const void *buf, size_t sz)
-{
-  octet kb[16];
-  const octet *p;
-
-  KSZ_ASSERT(tea, sz);
-  if (sz >= sizeof(kb))
-    p = buf;
-  else {
-    memcpy(kb, buf, sz);
-    memset(kb + sz, 0, sizeof(kb) - sz);
-    p = kb;
-  }
-
-  k->ka = LOAD32(p +  0); k->kb = LOAD32(p +  4);
-  k->kc = LOAD32(p +  8); k->kd = LOAD32(p + 12);
-  k->r = 32;
-
-  if (p == kb)
-    BURN(kb);
-}
-
-/* --- @tea_eblk@, @tea_dblk@ --- *
- *
- * Arguments:	@const tea_ctx *k@ = pointer to key block
- *		@const uint32 s[2]@ = pointer to source block
- *		@uint32 d[2]@ = pointer to teatination block
- *
- * Returns:	---
- *
- * Use:		Low-level block encryption and decryption.
- */
-
-#define DELTA 0x9e3779b9
-
-void tea_eblk(const tea_ctx *k, const uint32 *s, uint32 *d)
-{
-  uint32 y = s[0], z = s[1];
-  uint32 ka = k->ka, kb = k->kb, kc = k->kc, kd = k->kd;
-  uint32 n = 0;
-  unsigned i;
-
-  for (i = 0; i < k->r; i++) {
-    n += DELTA;
-    y = U32(y + (((z << 4) + ka) ^ (z + n) ^ ((z >> 5) + kb)));
-    z = U32(z + (((y << 4) + kc) ^ (y + n) ^ ((y >> 5) + kd)));
-  }
-  d[0] = y; d[1] = z;
-}
-
-void tea_dblk(const tea_ctx *k, const uint32 *s, uint32 *d)
-{
-  uint32 y = s[0], z = s[1];
-  uint32 ka = k->ka, kb = k->kb, kc = k->kc, kd = k->kd;
-  uint32 n = DELTA * k->r;
-  unsigned i;
-
-  for (i = 0; i < k->r; i++) {
-    z = U32(z - (((y << 4) + kc) ^ (y + n) ^ ((y >> 5) + kd)));
-    y = U32(y - (((z << 4) + ka) ^ (z + n) ^ ((z >> 5) + kb)));
-    n -= DELTA;
-  }
-  d[0] = y; d[1] = z;
-}
-
-BLKC_TEST(TEA, tea)
-
-/*----- That's all, folks -------------------------------------------------*/