+++ /dev/null
-/* -*-c-*-
- *
- * $Id: blowfish.c,v 1.4 2004/04/08 01:36:15 mdw Exp $
- *
- * The Blowfish block cipher
- *
- * (c) 1998 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 "blowfish.h"
-#include "blowfish-tab.h"
-#include "blkc.h"
-#include "gcipher.h"
-#include "paranoia.h"
-
-/*----- Global variables --------------------------------------------------*/
-
-static const blowfish_ctx ikey = BLOWFISH_IKEY;
-
-const octet blowfish_keysz[] = { KSZ_RANGE, BLOWFISH_KEYSZ, 1, 56, 1 };
-
-/*----- Macros ------------------------------------------------------------*/
-
-#define ROUND(k, x, y, r) do { \
- x ^= *r; \
- y ^= ((k->s0[U8(x >> 24)] + \
- k->s1[U8(x >> 16)]) ^ \
- k->s2[U8(x >> 8)]) + \
- k->s3[U8(x >> 0)]; \
-} while (0)
-
-#define EBLK(k, a, b, c, d) do { \
- const uint32 *_r = k->p; \
- uint32 _x = a; \
- uint32 _y = b; \
- ROUND(k, _x, _y, _r++); \
- ROUND(k, _y, _x, _r++); \
- ROUND(k, _x, _y, _r++); \
- ROUND(k, _y, _x, _r++); \
- ROUND(k, _x, _y, _r++); \
- ROUND(k, _y, _x, _r++); \
- ROUND(k, _x, _y, _r++); \
- ROUND(k, _y, _x, _r++); \
- ROUND(k, _x, _y, _r++); \
- ROUND(k, _y, _x, _r++); \
- ROUND(k, _x, _y, _r++); \
- ROUND(k, _y, _x, _r++); \
- ROUND(k, _x, _y, _r++); \
- ROUND(k, _y, _x, _r++); \
- ROUND(k, _x, _y, _r++); \
- ROUND(k, _y, _x, _r++); \
- c = _y ^ k->p[17]; \
- d = _x ^ k->p[16]; \
-} while (0)
-
-#define DBLK(k, a, b, c, d) do { \
- const uint32 *_r = k->p + 18; \
- uint32 _x = a; \
- uint32 _y = b; \
- ROUND(k, _x, _y, --_r); \
- ROUND(k, _y, _x, --_r); \
- ROUND(k, _x, _y, --_r); \
- ROUND(k, _y, _x, --_r); \
- ROUND(k, _x, _y, --_r); \
- ROUND(k, _y, _x, --_r); \
- ROUND(k, _x, _y, --_r); \
- ROUND(k, _y, _x, --_r); \
- ROUND(k, _x, _y, --_r); \
- ROUND(k, _y, _x, --_r); \
- ROUND(k, _x, _y, --_r); \
- ROUND(k, _y, _x, --_r); \
- ROUND(k, _x, _y, --_r); \
- ROUND(k, _y, _x, --_r); \
- ROUND(k, _x, _y, --_r); \
- ROUND(k, _y, _x, --_r); \
- c = _y ^ k->p[0]; \
- d = _x ^ k->p[1]; \
-} while (0)
-
-/*----- Low-level encryption interface ------------------------------------*/
-
-/* --- @blowfish_init@ --- *
- *
- * Arguments: @blowfish_ctx *k@ = pointer to key block to fill in
- * @const void *buf@ = pointer to buffer of key material
- * @size_t sz@ = size of key material
- *
- * Returns: ---
- *
- * Use: Initializes a Blowfish key buffer. Blowfish accepts
- * a more-or-less arbitrary size key.
- */
-
-void blowfish_init(blowfish_ctx *k, const void *buf, size_t sz)
-{
- KSZ_ASSERT(blowfish, sz);
-
- /* --- Copy the initial value over --- */
-
- memcpy(k, &ikey, sizeof(ikey));
-
- /* --- Initialize the %$P$% array --- */
-
- {
- const octet *p = buf;
- const octet *q = p + sz;
- int i = 0, j = 0;
- uint32 x = 0;
-
- while (i < 18) {
- x = (x << 8) | U8(*p++);
- if (p >= q)
- p = buf;
- if (++j >= 4) {
- k->p[i++] ^= x;
- x = 0;
- j = 0;
- }
- }
-
- x = 0;
- }
-
- /* --- Now mangle the complete array of keys --- */
-
- {
- uint32 b[2];
- int i;
-
- b[0] = b[1] = 0;
-
- for (i = 0; i < 18; i += 2) {
- blowfish_eblk(k, b, b);
- k->p[i] = b[0]; k->p[i + 1] = b[1];
- }
-
- for (i = 0; i < 256; i += 2) {
- blowfish_eblk(k, b, b);
- k->s0[i] = b[0]; k->s0[i + 1] = b[1];
- }
-
- for (i = 0; i < 256; i += 2) {
- blowfish_eblk(k, b, b);
- k->s1[i] = b[0]; k->s1[i + 1] = b[1];
- }
-
- for (i = 0; i < 256; i += 2) {
- blowfish_eblk(k, b, b);
- k->s2[i] = b[0]; k->s2[i + 1] = b[1];
- }
-
- for (i = 0; i < 256; i += 2) {
- blowfish_eblk(k, b, b);
- k->s3[i] = b[0]; k->s3[i + 1] = b[1];
- }
-
- BURN(b);
- }
-}
-
-/* --- @blowfish_eblk@, @blowfish_dblk@ --- *
- *
- * Arguments: @const blowfish_ctx *k@ = pointer to key block
- * @const uint32 s[2]@ = pointer to source block
- * @uint32 d[2]@ = pointer to destination block
- *
- * Returns: ---
- *
- * Use: Low-level block encryption and decryption.
- */
-
-void blowfish_eblk(const blowfish_ctx *k, const uint32 *s, uint32 *d)
-{
- EBLK(k, s[0], s[1], d[0], d[1]);
-}
-
-void blowfish_dblk(const blowfish_ctx *k, const uint32 *s, uint32 *d)
-{
- DBLK(k, s[0], s[1], d[0], d[1]);
-}
-
-BLKC_TEST(BLOWFISH, blowfish)
-
-/*----- That's all, folks -------------------------------------------------*/
projects / u / mdw / catacomb / blobdiff