--- /dev/null
+/* -*-c-*-
+ *
+ * $Id: cast128.c,v 1.1 2000/06/17 10:49:14 mdw Exp $
+ *
+ * The CAST-128 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.
+ */
+
+/*----- Revision history --------------------------------------------------*
+ *
+ * $Log: cast128.c,v $
+ * Revision 1.1 2000/06/17 10:49:14 mdw
+ * New cipher.
+ *
+ */
+
+/*----- Header files ------------------------------------------------------*/
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <mLib/bits.h>
+
+#include "blkc.h"
+#include "cast-base.h"
+#include "cast128.h"
+#include "gcipher.h"
+#include "paranoia.h"
+
+/*----- Global variables --------------------------------------------------*/
+
+const octet cast128_keysz[] = { KSZ_RANGE, CAST128_KEYSZ, 0, 16, 1 };
+
+/*----- Main code ---------------------------------------------------------*/
+
+/* --- @cast128_init@ --- *
+ *
+ * Arguments: @cast128_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 CAST-128 key buffer. CAST-128 accepts
+ * 128-bit keys or shorter.
+ */
+
+void cast128_init(cast128_ctx *k, const void *buf, size_t sz)
+{
+ const octet *p = buf;
+ uint32 kk[4];
+ unsigned i;
+ uint32 a, b, c, d, aa, bb, cc, dd;
+
+ /* --- Fiddle with the key size a bit --- */
+
+ KSZ_ASSERT(cast128, sz);
+
+ if (sz > 10)
+ k->r = 16;
+ else
+ k->r = 12;
+
+ /* --- Read the key into the array --- */
+
+ i = 0;
+ b = 32; aa = 0;
+ for (;;) {
+ if (!sz)
+ break;
+ b -= 8;
+ aa |= ((uint32)*p++ << b);
+ sz--;
+ if (b == 0) {
+ kk[i++] = aa;
+ if (i == 4)
+ break;
+ aa = 0;
+ b = 32;
+ }
+ }
+
+ for (; i < 4; i++) {
+ kk[i] = aa;
+ aa = 0;
+ }
+
+ /* --- Read the key words out --- */
+
+ a = kk[0]; b = kk[1]; c = kk[2]; d = kk[3];
+
+#define X_0123 a
+#define X_4567 b
+#define X_89ab c
+#define X_cdef d
+
+#define X_0 U8(X_0123 >> 24)
+#define X_1 U8(X_0123 >> 16)
+#define X_2 U8(X_0123 >> 8)
+#define X_3 U8(X_0123 >> 0)
+#define X_4 U8(X_4567 >> 24)
+#define X_5 U8(X_4567 >> 16)
+#define X_6 U8(X_4567 >> 8)
+#define X_7 U8(X_4567 >> 0)
+#define X_8 U8(X_89ab >> 24)
+#define X_9 U8(X_89ab >> 16)
+#define X_a U8(X_89ab >> 8)
+#define X_b U8(X_89ab >> 0)
+#define X_c U8(X_cdef >> 24)
+#define X_d U8(X_cdef >> 16)
+#define X_e U8(X_cdef >> 8)
+#define X_f U8(X_cdef >> 0)
+
+#define Z_0123 aa
+#define Z_4567 bb
+#define Z_89ab cc
+#define Z_cdef dd
+
+#define Z_0 U8(Z_0123 >> 24)
+#define Z_1 U8(Z_0123 >> 16)
+#define Z_2 U8(Z_0123 >> 8)
+#define Z_3 U8(Z_0123 >> 0)
+#define Z_4 U8(Z_4567 >> 24)
+#define Z_5 U8(Z_4567 >> 16)
+#define Z_6 U8(Z_4567 >> 8)
+#define Z_7 U8(Z_4567 >> 0)
+#define Z_8 U8(Z_89ab >> 24)
+#define Z_9 U8(Z_89ab >> 16)
+#define Z_a U8(Z_89ab >> 8)
+#define Z_b U8(Z_89ab >> 0)
+#define Z_c U8(Z_cdef >> 24)
+#define Z_d U8(Z_cdef >> 16)
+#define Z_e U8(Z_cdef >> 8)
+#define Z_f U8(Z_cdef >> 0)
+
+#define SK(w, x, y, z) \
+ cast_sk[0][w] ^ cast_sk[1][x] ^ cast_sk[2][y] ^ cast_sk[3][z]
+
+ i = 0;
+ Z_0123 = X_0123 ^ SK(X_d, X_f, X_c, X_e) ^ cast_sk[2][X_8];
+ Z_4567 = X_89ab ^ SK(Z_0, Z_2, Z_1, Z_3) ^ cast_sk[3][X_a];
+ Z_89ab = X_cdef ^ SK(Z_7, Z_6, Z_5, Z_4) ^ cast_sk[0][X_9];
+ Z_cdef = X_4567 ^ SK(Z_a, Z_9, Z_b, Z_8) ^ cast_sk[1][X_b];
+ k->km[i++] = SK(Z_8, Z_9, Z_7, Z_6) ^ cast_sk[0][Z_2];
+ k->km[i++] = SK(Z_a, Z_b, Z_5, Z_4) ^ cast_sk[1][Z_6];
+ k->km[i++] = SK(Z_c, Z_d, Z_3, Z_2) ^ cast_sk[2][Z_9];
+ k->km[i++] = SK(Z_e, Z_f, Z_1, Z_0) ^ cast_sk[3][Z_c];
+ X_0123 = Z_89ab ^ SK(Z_5, Z_7, Z_4, Z_6) ^ cast_sk[2][Z_0];
+ X_4567 = Z_0123 ^ SK(X_0, X_2, X_1, X_3) ^ cast_sk[3][Z_2];
+ X_89ab = Z_4567 ^ SK(X_7, X_6, X_5, X_4) ^ cast_sk[0][Z_1];
+ X_cdef = Z_cdef ^ SK(X_a, X_9, X_b, X_8) ^ cast_sk[1][Z_3];
+ k->km[i++] = SK(X_3, X_2, X_c, X_d) ^ cast_sk[0][X_8];
+ k->km[i++] = SK(X_1, X_0, X_e, X_f) ^ cast_sk[1][X_d];
+ k->km[i++] = SK(X_7, X_6, X_8, X_9) ^ cast_sk[2][X_3];
+ k->km[i++] = SK(X_5, X_4, X_a, X_b) ^ cast_sk[3][X_7];
+ Z_0123 = X_0123 ^ SK(X_d, X_f, X_c, X_e) ^ cast_sk[2][X_8];
+ Z_4567 = X_89ab ^ SK(Z_0, Z_2, Z_1, Z_3) ^ cast_sk[3][X_a];
+ Z_89ab = X_cdef ^ SK(Z_7, Z_6, Z_5, Z_4) ^ cast_sk[0][X_9];
+ Z_cdef = X_4567 ^ SK(Z_a, Z_9, Z_b, Z_8) ^ cast_sk[1][X_b];
+ k->km[i++] = SK(Z_3, Z_2, Z_c, Z_d) ^ cast_sk[0][Z_9];
+ k->km[i++] = SK(Z_1, Z_0, Z_e, Z_f) ^ cast_sk[1][Z_c];
+ k->km[i++] = SK(Z_7, Z_6, Z_8, Z_9) ^ cast_sk[2][Z_2];
+ k->km[i++] = SK(Z_5, Z_4, Z_a, Z_b) ^ cast_sk[3][Z_6];
+ X_0123 = Z_89ab ^ SK(Z_5, Z_7, Z_4, Z_6) ^ cast_sk[2][Z_0];
+ X_4567 = Z_0123 ^ SK(X_0, X_2, X_1, X_3) ^ cast_sk[3][Z_2];
+ X_89ab = Z_4567 ^ SK(X_7, X_6, X_5, X_4) ^ cast_sk[0][Z_1];
+ X_cdef = Z_cdef ^ SK(X_a, X_9, X_b, X_8) ^ cast_sk[1][Z_3];
+ k->km[i++] = SK(X_8, X_9, X_7, X_6) ^ cast_sk[0][X_3];
+ k->km[i++] = SK(X_a, X_b, X_5, X_4) ^ cast_sk[1][X_7];
+ k->km[i++] = SK(X_c, X_d, X_3, X_2) ^ cast_sk[2][X_8];
+ k->km[i++] = SK(X_e, X_f, X_1, X_0) ^ cast_sk[3][X_d];
+
+ i = 0;
+ Z_0123 = X_0123 ^ SK(X_d, X_f, X_c, X_e) ^ cast_sk[2][X_8];
+ Z_4567 = X_89ab ^ SK(Z_0, Z_2, Z_1, Z_3) ^ cast_sk[3][X_a];
+ Z_89ab = X_cdef ^ SK(Z_7, Z_6, Z_5, Z_4) ^ cast_sk[0][X_9];
+ Z_cdef = X_4567 ^ SK(Z_a, Z_9, Z_b, Z_8) ^ cast_sk[1][X_b];
+ k->kr[i++] = (SK(Z_8, Z_9, Z_7, Z_6) ^ cast_sk[0][Z_2]) & 0x1f;
+ k->kr[i++] = (SK(Z_a, Z_b, Z_5, Z_4) ^ cast_sk[1][Z_6]) & 0x1f;
+ k->kr[i++] = (SK(Z_c, Z_d, Z_3, Z_2) ^ cast_sk[2][Z_9]) & 0x1f;
+ k->kr[i++] = (SK(Z_e, Z_f, Z_1, Z_0) ^ cast_sk[3][Z_c]) & 0x1f;
+ X_0123 = Z_89ab ^ SK(Z_5, Z_7, Z_4, Z_6) ^ cast_sk[2][Z_0];
+ X_4567 = Z_0123 ^ SK(X_0, X_2, X_1, X_3) ^ cast_sk[3][Z_2];
+ X_89ab = Z_4567 ^ SK(X_7, X_6, X_5, X_4) ^ cast_sk[0][Z_1];
+ X_cdef = Z_cdef ^ SK(X_a, X_9, X_b, X_8) ^ cast_sk[1][Z_3];
+ k->kr[i++] = (SK(X_3, X_2, X_c, X_d) ^ cast_sk[0][X_8]) & 0x1f;
+ k->kr[i++] = (SK(X_1, X_0, X_e, X_f) ^ cast_sk[1][X_d]) & 0x1f;
+ k->kr[i++] = (SK(X_7, X_6, X_8, X_9) ^ cast_sk[2][X_3]) & 0x1f;
+ k->kr[i++] = (SK(X_5, X_4, X_a, X_b) ^ cast_sk[3][X_7]) & 0x1f;
+ Z_0123 = X_0123 ^ SK(X_d, X_f, X_c, X_e) ^ cast_sk[2][X_8];
+ Z_4567 = X_89ab ^ SK(Z_0, Z_2, Z_1, Z_3) ^ cast_sk[3][X_a];
+ Z_89ab = X_cdef ^ SK(Z_7, Z_6, Z_5, Z_4) ^ cast_sk[0][X_9];
+ Z_cdef = X_4567 ^ SK(Z_a, Z_9, Z_b, Z_8) ^ cast_sk[1][X_b];
+ k->kr[i++] = (SK(Z_3, Z_2, Z_c, Z_d) ^ cast_sk[0][Z_9]) & 0x1f;
+ k->kr[i++] = (SK(Z_1, Z_0, Z_e, Z_f) ^ cast_sk[1][Z_c]) & 0x1f;
+ k->kr[i++] = (SK(Z_7, Z_6, Z_8, Z_9) ^ cast_sk[2][Z_2]) & 0x1f;
+ k->kr[i++] = (SK(Z_5, Z_4, Z_a, Z_b) ^ cast_sk[3][Z_6]) & 0x1f;
+ X_0123 = Z_89ab ^ SK(Z_5, Z_7, Z_4, Z_6) ^ cast_sk[2][Z_0];
+ X_4567 = Z_0123 ^ SK(X_0, X_2, X_1, X_3) ^ cast_sk[3][Z_2];
+ X_89ab = Z_4567 ^ SK(X_7, X_6, X_5, X_4) ^ cast_sk[0][Z_1];
+ X_cdef = Z_cdef ^ SK(X_a, X_9, X_b, X_8) ^ cast_sk[1][Z_3];
+ k->kr[i++] = (SK(X_8, X_9, X_7, X_6) ^ cast_sk[0][X_3]) & 0x1f;
+ k->kr[i++] = (SK(X_a, X_b, X_5, X_4) ^ cast_sk[1][X_7]) & 0x1f;
+ k->kr[i++] = (SK(X_c, X_d, X_3, X_2) ^ cast_sk[2][X_8]) & 0x1f;
+ k->kr[i++] = (SK(X_e, X_f, X_1, X_0) ^ cast_sk[3][X_d]) & 0x1f;
+
+ BURN(kk);
+}
+
+/* --- @cast128_eblk@, @cast128_dblk@ --- *
+ *
+ * Arguments: @const cast128_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 cast128_eblk(const cast128_ctx *k, const uint32 *s, uint32 *d)
+{
+ uint32 a = s[0], b = s[1];
+ const uint32 *km = k->km;
+ const octet *kr = k->kr;
+
+ switch (k->r) {
+ default:
+ CAST_R1(*km++, *kr++, a, b);
+ CAST_R2(*km++, *kr++, b, a);
+ CAST_R3(*km++, *kr++, a, b);
+ CAST_R1(*km++, *kr++, b, a);
+ CAST_R2(*km++, *kr++, a, b);
+ CAST_R3(*km++, *kr++, b, a);
+ CAST_R1(*km++, *kr++, a, b);
+ CAST_R2(*km++, *kr++, b, a);
+ CAST_R3(*km++, *kr++, a, b);
+ CAST_R1(*km++, *kr++, b, a);
+ CAST_R2(*km++, *kr++, a, b);
+ CAST_R3(*km++, *kr++, b, a);
+ if (k->r == 12)
+ break;
+ CAST_R1(*km++, *kr++, a, b);
+ CAST_R2(*km++, *kr++, b, a);
+ CAST_R3(*km++, *kr++, a, b);
+ CAST_R1(*km++, *kr++, b, a);
+ break;
+ }
+
+ d[0] = b; d[1] = a;
+}
+
+void cast128_dblk(const cast128_ctx *k, const uint32 *s, uint32 *d)
+{
+ uint32 a = s[0], b = s[1];
+ const uint32 *km = k->km + k->r;
+ const octet *kr = k->kr + k->r;
+
+ switch (k->r) {
+ case 16:
+ default:
+ CAST_R1(*--km, *--kr, a, b);
+ CAST_R3(*--km, *--kr, b, a);
+ CAST_R2(*--km, *--kr, a, b);
+ CAST_R1(*--km, *--kr, b, a);
+ case 12:
+ CAST_R3(*--km, *--kr, a, b);
+ CAST_R2(*--km, *--kr, b, a);
+ CAST_R1(*--km, *--kr, a, b);
+ CAST_R3(*--km, *--kr, b, a);
+ CAST_R2(*--km, *--kr, a, b);
+ CAST_R1(*--km, *--kr, b, a);
+ CAST_R3(*--km, *--kr, a, b);
+ CAST_R2(*--km, *--kr, b, a);
+ CAST_R1(*--km, *--kr, a, b);
+ CAST_R3(*--km, *--kr, b, a);
+ CAST_R2(*--km, *--kr, a, b);
+ CAST_R1(*--km, *--kr, b, a);
+ break;
+ }
+
+ d[0] = b; d[1] = a;
+}
+
+BLKC_TEST(CAST128, cast128)
+
+/*----- That's all, folks -------------------------------------------------*/
projects / u / mdw / catacomb / blobdiff