X-Git-Url: https://git.distorted.org.uk/~mdw/catacomb/blobdiff_plain/ba6e6b64033b1f9de49feccb5c9cd438354481f7..0f00dc4c8eb47e67bc0f148c2dd109f73a451e0a:/symm/tiger-base.h

diff --git a/symm/tiger-base.h b/symm/tiger-base.h
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+/* -*-c-*-
+ *
+ * Common definitions for the Tiger hash function
+ *
+ * (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.
+ */
+
+#ifndef CATACOMB_TIGER_BASE_H
+#define CATACOMB_TIGER_BASE_H
+
+#ifdef __cplusplus
+  extern "C" {
+#endif
+
+/*----- Header files ------------------------------------------------------*/
+
+#include <mLib/bits.h>
+
+/*----- Macros provided ---------------------------------------------------*/
+
+/* --- The guts of a single round --- */
+
+#define TIGER_ROUND(a, b, c, x, n, op) do {				\
+  kludge64 _t;								\
+  XOR64(c, c, x);							\
+  _t =		s[0][U8(LO64(c) >>  0)];				\
+  XOR64(_t, _t, s[1][U8(LO64(c) >> 16)]);				\
+  XOR64(_t, _t, s[2][U8(HI64(c) >>  0)]);				\
+  XOR64(_t, _t, s[3][U8(HI64(c) >> 16)]);				\
+  SUB64(a, a, _t);							\
+  _t =		s[3][U8(LO64(c) >>  8)];				\
+  XOR64(_t, _t, s[2][U8(LO64(c) >> 24)]);				\
+  XOR64(_t, _t, s[1][U8(HI64(c) >>  8)]);				\
+  XOR64(_t, _t, s[0][U8(HI64(c) >> 24)]);				\
+  ADD64(b, b, _t);							\
+  LSL64_(_t, b, n);							\
+  op##64(b, _t, b);							\
+} while (0)
+
+/* --- One pass over the buffer --- */
+
+#define TIGER_PASS(a, b, c, x, n, op) do {				\
+  TIGER_ROUND(a, b, c, x[0], n, op);					\
+  TIGER_ROUND(b, c, a, x[1], n, op);					\
+  TIGER_ROUND(c, a, b, x[2], n, op);					\
+  TIGER_ROUND(a, b, c, x[3], n, op);					\
+  TIGER_ROUND(b, c, a, x[4], n, op);					\
+  TIGER_ROUND(c, a, b, x[5], n, op);					\
+  TIGER_ROUND(a, b, c, x[6], n, op);					\
+  TIGER_ROUND(b, c, a, x[7], n, op);					\
+} while (0)
+
+/* --- A step in the `key schedule' --- */
+
+#define TIGER_KSTEP(a, b, c, d, op, n) do {				\
+  kludge64 _u;								\
+  XOR64(b, b, a);							\
+  ADD64(c, c, b);							\
+  CPL64(_u, b); op##64_(_u, _u, n); XOR64(_u, _u, c); SUB64(d, d, _u);	\
+} while (0)
+
+/* --- The `key schedule' -- mangle the buffer --- */
+
+#define TIGER_KSCHED(x) do {						\
+  kludge64 _t;								\
+									\
+  SET64(_t, 0xa5a5a5a5, 0xa5a5a5a5);					\
+  XOR64(_t, _t, x[7]); SUB64(x[0], x[0], _t);				\
+  TIGER_KSTEP(x[0], x[1], x[2], x[3], LSL, 19);				\
+  TIGER_KSTEP(x[3], x[4], x[5], x[6], LSR, 23);				\
+  TIGER_KSTEP(x[6], x[7], x[0], x[1], LSL, 19);				\
+  TIGER_KSTEP(x[1], x[2], x[3], x[4], LSR, 23);				\
+  XOR64(x[5], x[5], x[4]);						\
+  ADD64(x[6], x[6], x[5]);						\
+  SET64(_t, 0x01234567, 0x89abcdef);					\
+  XOR64(_t, _t, x[6]); SUB64(x[7], x[7], _t);				\
+} while (0)
+
+/* --- The Tiger compression function --- */
+
+#define TIGER_CORE(a, b, c, x) do {					\
+  kludge64 _a, _b, _c;							\
+  _a = a, _b = b, _c = c;						\
+  TIGER_PASS(_a, _b, _c, x, 2, ADD);					\
+  TIGER_KSCHED(x);							\
+  TIGER_PASS(_c, _a, _b, x, 3, SUB);					\
+  TIGER_KSCHED(x);							\
+  TIGER_PASS(_b, _c, _a, x, 3, ADD);					\
+  XOR64(a, _a, a); SUB64(b, _b, b); ADD64(c, _c, c);			\
+} while (0)
+
+/*----- That's all, folks -------------------------------------------------*/
+
+#ifdef __cplusplus
+  }
+#endif
+
+#endif