X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/blobdiff_plain/ba6e6b64033b1f9de49feccb5c9cd438354481f7..0f00dc4c8eb47e67bc0f148c2dd109f73a451e0a:/skipjack.c diff --git a/skipjack.c b/skipjack.c deleted file mode 100644 index d87f22c..0000000 --- a/skipjack.c +++ /dev/null @@ -1,178 +0,0 @@ -/* -*-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 - -#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 -------------------------------------------------*/