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[u/mdw/catacomb] / symm / blowfish.h

diff --git a/symm/blowfish.h b/symm/blowfish.h
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+/* -*-c-*-
+ *
+ * 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.
+ */
+
+/*----- Notes on the Blowfish block cipher --------------------------------*
+ *
+ * Blowfish was invented by Bruce Schneier.  The algorithm is unpatented and
+ * free for anyone to use.  It's fast, simple, offers a big key, and is
+ * looking relatively bulletproof.  It's also this author's block cipher of
+ * choice, for what little that's worth.  The disadvantage is that Blowfish
+ * has a particularly heavyweight key schedule.
+ */
+
+#ifndef CATACOMB_BLOWFISH_H
+#define CATACOMB_BLOWFISH_H
+
+#ifdef __cplusplus
+  extern "C" {
+#endif
+
+/*----- Header files ------------------------------------------------------*/
+
+#include <stddef.h>
+
+#include <mLib/bits.h>
+
+/*----- Magical numbers ---------------------------------------------------*/
+
+#define BLOWFISH_BLKSZ 8
+#define BLOWFISH_KEYSZ 32
+#define BLOWFISH_CLASS (N, B, 64)
+
+extern const octet blowfish_keysz[];
+
+/*----- Data structures ---------------------------------------------------*/
+
+typedef struct blowfish_ctx {
+  uint32 p[18];
+  uint32 s0[256], s1[256], s2[256], s3[256];
+} blowfish_ctx;
+
+/*----- Functions provided ------------------------------------------------*/
+
+/* --- @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.
+ */
+
+extern void blowfish_init(blowfish_ctx */*k*/,
+                         const void */*buf*/, size_t /*sz*/);
+
+/* --- @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.
+ */
+
+extern void blowfish_eblk(const blowfish_ctx */*k*/,
+                         const uint32 */*s*/, uint32 */*d*/);
+
+extern void blowfish_dblk(const blowfish_ctx */*k*/,
+                         const uint32 */*s*/, uint32 */*d*/);
+
+/*----- That's all, folks -------------------------------------------------*/
+
+#ifdef __cplusplus
+  }
+#endif
+
+#endif