--- /dev/null
+/* -*-c-*-
+ *
+ * The Square 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 <assert.h>
+#include <stdio.h>
+
+#include <mLib/bits.h>
+
+#include "blkc.h"
+#include "gcipher.h"
+#include "paranoia.h"
+#include "square.h"
+#include "square-tab.h"
+
+/*----- Global variables --------------------------------------------------*/
+
+const octet square_keysz[] = { KSZ_RANGE, SQUARE_KEYSZ, 4, 16, 4 };
+
+/*----- Constant tables ---------------------------------------------------*/
+
+static const octet S[256] = SQUARE_S, SI[256] = SQUARE_SI;
+static const uint32 T[4][256] = SQUARE_T, TI[4][256] = SQUARE_TI;
+static const uint32 U[4][256] = SQUARE_U;
+static const octet rcon[] = SQUARE_RCON;
+
+/*----- Main code ---------------------------------------------------------*/
+
+/* --- @square_init@ --- *
+ *
+ * Arguments: @square_ctx *k@ = pointer to context to initialize
+ * @const void *buf@ = pointer to buffer of key material
+ * @size_t sz@ = size of the key material
+ *
+ * Returns: ---
+ *
+ * Use: Initializes a Square context with a particular key. Square
+ * keys must be a multiple of 32 bits long, and may be at most
+ * 128 bits.
+ */
+
+void square_init(square_ctx *k, const void *buf, size_t sz)
+{
+ unsigned nk, nr, nw;
+ unsigned i, j, jj;
+ const octet *p;
+ uint32 ww;
+ uint32 kk[SQUARE_KWORDS];
+
+ /* --- Sort out the key size --- */
+
+ KSZ_ASSERT(square, sz);
+ nk = sz / 4;
+
+ /* --- Fetch the first key words out --- */
+
+ p = buf;
+ for (i = 0; i < nk; i++) {
+ kk[i] = LOAD32_L(p);
+ p += 4;
+ }
+ nr = 8;
+
+ /* --- Expand this material to fill the rest of the table --- */
+
+ nw = (nr + 1) * 4;
+ ww = kk[i - 1];
+ p = rcon;
+ for (; i < nw; i++) {
+ uint32 w = kk[i - nk];
+ if (i % nk == 0) {
+ ww = ROR32(ww, 8);
+ w ^= ww ^ *p++;
+ } else
+ w ^= ww;
+ kk[i] = ww = w;
+ }
+
+ /* --- Make the encryption and decryption keys --- */
+
+ for (i = 0; i < nr * 4; i++) {
+ uint32 w = kk[i];
+ k->w[i] = (U[0][U8(w >> 0)] ^ U[1][U8(w >> 8)] ^
+ U[2][U8(w >> 16)] ^ U[3][U8(w >> 24)]);
+ }
+ for (; i < nw; i++)
+ k->w[i] = kk[i];
+
+ jj = nw;
+ for (i = 0; i < nr * 4; i += 4) {
+ jj -= 4;
+ for (j = 0; j < 4; j++)
+ k->wi[i + j] = kk[jj + j];
+ }
+ for (j = 0; j < 4; j++)
+ k->wi[i + j] = k->w[j];
+
+ BURN(kk);
+}
+
+/* --- @square_eblk@, @square_dblk@ --- *
+ *
+ * Arguments: @const square_ctx *k@ = pointer to Square context
+ * @const uint32 s[4]@ = pointer to source block
+ * @uint32 d[4]@ = pointer to destination block
+ *
+ * Returns: ---
+ *
+ * Use: Low-level block encryption and decryption.
+ */
+
+#define SUB(s, sh, a, b, c, d) \
+ (s[U8((a) >> sh)] << 0 | s[U8((b) >> sh)] << 8 | \
+ s[U8((c) >> sh)] << 16 | s[U8((d) >> sh)] << 24)
+
+#define MIX(t, sh, a, b, c, d) \
+ (t[0][U8((a) >> sh)] ^ t[1][U8((b) >> sh)] ^ \
+ t[2][U8((c) >> sh)] ^ t[3][U8((d) >> sh)])
+
+#define DO(what, t, aa, bb, cc, dd, a, b, c, d, w) do { \
+ aa = what(t, 0, a, b, c, d) ^ *w++; \
+ bb = what(t, 8, a, b, c, d) ^ *w++; \
+ cc = what(t, 16, a, b, c, d) ^ *w++; \
+ dd = what(t, 24, a, b, c, d) ^ *w++; \
+} while (0)
+
+void square_eblk(const square_ctx *k, const uint32 *s, uint32 *dst)
+{
+ uint32 a = s[0], b = s[1], c = s[2], d = s[3];
+ uint32 aa, bb, cc, dd;
+ const uint32 *w = k->w;
+
+ a ^= *w++; b ^= *w++; c ^= *w++; d ^= *w++;
+
+ DO(MIX, T, aa, bb, cc, dd, a, b, c, d, w);
+ DO(MIX, T, a, b, c, d, aa, bb, cc, dd, w);
+ DO(MIX, T, aa, bb, cc, dd, a, b, c, d, w);
+ DO(MIX, T, a, b, c, d, aa, bb, cc, dd, w);
+ DO(MIX, T, aa, bb, cc, dd, a, b, c, d, w);
+ DO(MIX, T, a, b, c, d, aa, bb, cc, dd, w);
+ DO(MIX, T, aa, bb, cc, dd, a, b, c, d, w);
+ DO(SUB, S, a, b, c, d, aa, bb, cc, dd, w);
+
+ dst[0] = a; dst[1] = b; dst[2] = c; dst[3] = d;
+}
+
+void square_dblk(const square_ctx *k, const uint32 *s, uint32 *dst)
+{
+ uint32 a = s[0], b = s[1], c = s[2], d = s[3];
+ uint32 aa, bb, cc, dd;
+ const uint32 *w = k->wi;
+
+ a ^= *w++; b ^= *w++; c ^= *w++; d ^= *w++;
+
+ DO(MIX, TI, aa, bb, cc, dd, a, b, c, d, w);
+ DO(MIX, TI, a, b, c, d, aa, bb, cc, dd, w);
+ DO(MIX, TI, aa, bb, cc, dd, a, b, c, d, w);
+ DO(MIX, TI, a, b, c, d, aa, bb, cc, dd, w);
+ DO(MIX, TI, aa, bb, cc, dd, a, b, c, d, w);
+ DO(MIX, TI, a, b, c, d, aa, bb, cc, dd, w);
+ DO(MIX, TI, aa, bb, cc, dd, a, b, c, d, w);
+ DO(SUB, SI, a, b, c, d, aa, bb, cc, dd, w);
+
+ dst[0] = a; dst[1] = b; dst[2] = c; dst[3] = d;
+}
+
+BLKC_TEST(SQUARE, square)
+
+/*----- That's all, folks -------------------------------------------------*/
projects / u / mdw / catacomb / blobdiff