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

diff --git a/symm/tiger.c b/symm/tiger.c
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+/* -*-c-*-
+ *
+ * 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.
+ */
+
+/*----- Header files ------------------------------------------------------*/
+
+#include <mLib/bits.h>
+
+#include "ghash-def.h"
+#include "hash.h"
+#include "tiger.h"
+#include "tiger-tab.h"
+#include "tiger-base.h"
+
+/*----- S-boxes -----------------------------------------------------------*/
+
+static const kludge64 s[4][256] = TIGER_S;
+
+/*----- Main code ---------------------------------------------------------*/
+
+/* --- @tiger_compress@ --- *
+ *
+ * Arguments:	@tiger_ctx *ctx@ = pointer to context block
+ *		@const void *sbuf@ = pointer to buffer of appropriate size
+ *
+ * Returns:	---
+ *
+ * Use:		Tiger compression function.
+ */
+
+void tiger_compress(tiger_ctx *ctx, const void *sbuf)
+{
+  kludge64 x[8];
+  int i;
+  const octet *p;
+  for (i = 0, p = sbuf; i < 8; i++, p += 8)
+    LOAD64_L_(x[i], p);
+  TIGER_CORE(ctx->a, ctx->b, ctx->c, x);
+}
+
+/* --- @tiger_init@ --- *
+ *
+ * Arguments:	@tiger_ctx *ctx@ = pointer to context block to initialize
+ *
+ * Returns:	---
+ *
+ * Use:		Initializes a context block ready for hashing.
+ */
+
+void tiger_init(tiger_ctx *ctx)
+{
+  SET64(ctx->a, 0x01234567, 0x89abcdef);
+  SET64(ctx->b, 0xfedcba98, 0x76543210);
+  SET64(ctx->c, 0xf096a5b4, 0xc3b2e187);
+  ctx->off = 0;
+  ctx->nl = ctx->nh = 0;
+}
+
+/* --- @tiger_set@ --- *
+ *
+ * Arguments:	@tiger_ctx *ctx@ = pointer to context block
+ *		@const void *buf@ = pointer to state buffer
+ *		@unsigned long count@ = current count of bytes processed
+ *
+ * Returns:	---
+ *
+ * Use:		Initializes a context block from a given state.  This is
+ *		useful in cases where the initial hash state is meant to be
+ *		secret, e.g., for NMAC and HMAC support.
+ */
+
+void tiger_set(tiger_ctx *ctx, const void *buf, unsigned long count)
+{
+  const octet *p = buf;
+  LOAD64_L_(ctx->a, p +	 0);
+  LOAD64_L_(ctx->b, p +	 8);
+  LOAD64_L_(ctx->c, p + 16);
+  ctx->off = 0;
+  ctx->nl = U32(count);
+  ctx->nh = U32(((count & ~MASK32) >> 16) >> 16);
+}
+
+/* --- @tiger_hash@ --- *
+ *
+ * Arguments:	@tiger_ctx *ctx@ = pointer to context block
+ *		@const void *buf@ = buffer of data to hash
+ *		@size_t sz@ = size of buffer to hash
+ *
+ * Returns:	---
+ *
+ * Use:		Hashes a buffer of data.  The buffer may be of any size and
+ *		alignment.
+ */
+
+void tiger_hash(tiger_ctx *ctx, const void *buf, size_t sz)
+{
+  HASH_BUFFER(TIGER, tiger, ctx, buf, sz);
+}
+
+/* --- @tiger_done@ --- *
+ *
+ * Arguments:	@tiger_ctx *ctx@ = pointer to context block
+ *		@void *hash@ = pointer to output buffer
+ *
+ * Returns:	---
+ *
+ * Use:		Returns the hash of the data read so far.
+ */
+
+void tiger_done(tiger_ctx *ctx, void *hash)
+{
+  octet *p = hash;
+  HASH_PAD(TIGER, tiger, ctx, 0x01u, 0, 8);
+  STORE32_L(ctx->buf + TIGER_BUFSZ - 8, ctx->nl << 3);
+  STORE32_L(ctx->buf + TIGER_BUFSZ - 4, (ctx->nl >> 29) | (ctx->nh << 3));
+  tiger_compress(ctx, ctx->buf);
+  STORE64_L_(p +  0, ctx->a);
+  STORE64_L_(p +  8, ctx->b);
+  STORE64_L_(p + 16, ctx->c);
+}
+
+/* --- @tiger_state@ --- *
+ *
+ * Arguments:	@tiger_ctx *ctx@ = pointer to context
+ *		@void *state@ = pointer to buffer for current state
+ *
+ * Returns:	Number of bytes written to the hash function so far.
+ *
+ * Use:		Returns the current state of the hash function such that
+ *		it can be passed to @tiger_set@.
+ */
+
+unsigned long tiger_state(tiger_ctx *ctx, void *state)
+{
+  octet *p = state;
+  STORE64_L_(p +  0, ctx->a);
+  STORE64_L_(p +  8, ctx->b);
+  STORE64_L_(p + 16, ctx->c);
+  return (ctx->nl | ((ctx->nh << 16) << 16));
+}
+
+/* --- Generic interface --- */
+
+GHASH_DEF(TIGER, tiger)
+
+/* --- Test code --- */
+
+HASH_TEST(TIGER, tiger)
+
+/*----- That's all, folks -------------------------------------------------*/