+++ /dev/null
-/* -*-c-*-
- *
- * $Id: skipjack.c,v 1.5 2004/04/08 01:36:15 mdw Exp $
- *
- * The Skipjack block cipher
- *
- * (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 "skipjack.h"
-#include "skipjack-tab.h"
-
-/*----- Global variables --------------------------------------------------*/
-
-const octet skipjack_keysz[] = { KSZ_SET, 10, 0 };
-
-/*----- The Skipjack S-box ------------------------------------------------*/
-
-static const octet f[256] = SKIPJACK_S;
-
-/*----- Main code ---------------------------------------------------------*/
-
-/* --- @skipjack_init@ --- *
- *
- * Arguments: @skipjack_ctx *k@ = pointer to key block
- * @const void *buf@ = pointer to key buffer
- * @size_t sz@ = size of key material
- *
- * Returns: ---
- *
- * Use: Initializes a Skipjack key buffer. The key buffer must be
- * exactly 10 bytes long.
- */
-
-void skipjack_init(skipjack_ctx *k, const void *buf, size_t sz)
-{
- const octet *b = buf;
- uint32 crud;
- KSZ_ASSERT(skipjack, sz);
- k->ka = LOAD32(b);
- k->kb = LOAD32(b + 4);
- crud = LOAD16(b + 8);
- k->kc = U32((crud << 16) | (k->ka >> 16));
- k->kd = U32((k->ka << 16) | (k->kb >> 16));
- k->ke = U32((k->kb << 16) | crud);
- crud = 0;
-}
-
-/* --- @skipjack_eblk@, @skipjack_dblk@ --- *
- *
- * Arguments: @const skipjack_ctx *k@ = pointer to key block
- * @const uint32 s[2]@ = pointer to source block
- * @uint32 d[2]@ = pointer to skipjacktination block
- *
- * Returns: ---
- *
- * Use: Low-level block encryption and decryption.
- */
-
-#define G(x, k) do { \
- octet _x = U8(x >> 8), _y = U8(x); \
- _x ^= f[_y ^ U8(k >> 24)]; \
- _y ^= f[_x ^ U8(k >> 16)]; \
- _x ^= f[_y ^ U8(k >> 8)]; \
- _y ^= f[_x ^ U8(k >> 0)]; \
- x = (_x << 8) | _y; \
-} while (0)
-
-#define RULE_A(w, x, y, z, n, k) do { \
- G(w, k); z ^= w ^ n++; \
-} while (0)
-
-#define RULE_B(w, x, y, z, n, k) do { \
- x ^= w ^ n++; G(w, k); \
-} while (0)
-
-void skipjack_eblk(const skipjack_ctx *k, const uint32 *s, uint32 *d)
-{
- unsigned n = 1;
- uint16 w = U16(s[0] >> 16), x = U16(s[0]);
- uint16 y = U16(s[1] >> 16), z = U16(s[1]);
- uint32 ka = k->ka, kb = k->kb, kc = k->kc, kd = k->kd, ke = k->ke;
-
- RULE_A(w, x, y, z, n, ka); RULE_A(z, w, x, y, n, kb);
- RULE_A(y, z, w, x, n, kc); RULE_A(x, y, z, w, n, kd);
- RULE_A(w, x, y, z, n, ke); RULE_A(z, w, x, y, n, ka);
- RULE_A(y, z, w, x, n, kb); RULE_A(x, y, z, w, n, kc);
- RULE_B(w, x, y, z, n, kd); RULE_B(z, w, x, y, n, ke);
- RULE_B(y, z, w, x, n, ka); RULE_B(x, y, z, w, n, kb);
- RULE_B(w, x, y, z, n, kc); RULE_B(z, w, x, y, n, kd);
- RULE_B(y, z, w, x, n, ke); RULE_B(x, y, z, w, n, ka);
- RULE_A(w, x, y, z, n, kb); RULE_A(z, w, x, y, n, kc);
- RULE_A(y, z, w, x, n, kd); RULE_A(x, y, z, w, n, ke);
- RULE_A(w, x, y, z, n, ka); RULE_A(z, w, x, y, n, kb);
- RULE_A(y, z, w, x, n, kc); RULE_A(x, y, z, w, n, kd);
- RULE_B(w, x, y, z, n, ke); RULE_B(z, w, x, y, n, ka);
- RULE_B(y, z, w, x, n, kb); RULE_B(x, y, z, w, n, kc);
- RULE_B(w, x, y, z, n, kd); RULE_B(z, w, x, y, n, ke);
- RULE_B(y, z, w, x, n, ka); RULE_B(x, y, z, w, n, kb);
-
- d[0] = ((uint32)w << 16) | (uint32)x;
- d[1] = ((uint32)y << 16) | (uint32)z;
-}
-
-#define G_INV(x, k) do { \
- octet _x = U8(x >> 8), _y = U8(x); \
- _y ^= f[_x ^ U8(k >> 0)]; \
- _x ^= f[_y ^ U8(k >> 8)]; \
- _y ^= f[_x ^ U8(k >> 16)]; \
- _x ^= f[_y ^ U8(k >> 24)]; \
- x = (_x << 8) | _y; \
-} while (0)
-
-#define RULE_A_INV(w, x, y, z, n, i) do { \
- w ^= x ^ --n; G_INV(x, i); \
-} while (0)
-
-#define RULE_B_INV(w, x, y, z, n, i) do { \
- G_INV(x, i); y ^= x ^ --n; \
-} while (0)
-
-void skipjack_dblk(const skipjack_ctx *k, const uint32 *s, uint32 *d)
-{
- unsigned n = 33;
- uint16 w = U16(s[0] >> 16), x = U16(s[0]);
- uint16 y = U16(s[1] >> 16), z = U16(s[1]);
- uint32 ka = k->ka, kb = k->kb, kc = k->kc, kd = k->kd, ke = k->ke;
-
- RULE_B_INV(w, x, y, z, n, kb); RULE_B_INV(x, y, z, w, n, ka);
- RULE_B_INV(y, z, w, x, n, ke); RULE_B_INV(z, w, x, y, n, kd);
- RULE_B_INV(w, x, y, z, n, kc); RULE_B_INV(x, y, z, w, n, kb);
- RULE_B_INV(y, z, w, x, n, ka); RULE_B_INV(z, w, x, y, n, ke);
- RULE_A_INV(w, x, y, z, n, kd); RULE_A_INV(x, y, z, w, n, kc);
- RULE_A_INV(y, z, w, x, n, kb); RULE_A_INV(z, w, x, y, n, ka);
- RULE_A_INV(w, x, y, z, n, ke); RULE_A_INV(x, y, z, w, n, kd);
- RULE_A_INV(y, z, w, x, n, kc); RULE_A_INV(z, w, x, y, n, kb);
- RULE_B_INV(w, x, y, z, n, ka); RULE_B_INV(x, y, z, w, n, ke);
- RULE_B_INV(y, z, w, x, n, kd); RULE_B_INV(z, w, x, y, n, kc);
- RULE_B_INV(w, x, y, z, n, kb); RULE_B_INV(x, y, z, w, n, ka);
- RULE_B_INV(y, z, w, x, n, ke); RULE_B_INV(z, w, x, y, n, kd);
- RULE_A_INV(w, x, y, z, n, kc); RULE_A_INV(x, y, z, w, n, kb);
- RULE_A_INV(y, z, w, x, n, ka); RULE_A_INV(z, w, x, y, n, ke);
- RULE_A_INV(w, x, y, z, n, kd); RULE_A_INV(x, y, z, w, n, kc);
- RULE_A_INV(y, z, w, x, n, kb); RULE_A_INV(z, w, x, y, n, ka);
-
- d[0] = ((uint32)w << 16) | (uint32)x;
- d[1] = ((uint32)y << 16) | (uint32)z;
-}
-
-BLKC_TEST(SKIPJACK, skipjack)
-
-/*----- That's all, folks -------------------------------------------------*/
projects / u / mdw / catacomb / blobdiff