--- /dev/null
+/* -*-c-*-
+ *
+ * Ciphertext block chaining for block ciphers
+ *
+ * (c) 1999 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_CBC_H
+#define CATACOMB_CBC_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/*----- Header files ------------------------------------------------------*/
+
+#include <stddef.h>
+
+#include <mLib/bits.h>
+
+#ifndef CATACOMB_GCIPHER_H
+# include "gcipher.h"
+#endif
+
+/*----- Macros ------------------------------------------------------------*/
+
+/* --- @CBC_DECL@ --- *
+ *
+ * Arguments: @PRE@, @pre@ = prefixes for the underlying block cipher
+ *
+ * Use: Creates declarations for CBC stealing mode.
+ */
+
+#define CBC_DECL(PRE, pre) \
+ \
+/* --- Cipher block chaining context --- */ \
+ \
+typedef struct pre##_cbcctx { \
+ pre##_ctx ctx; /* Underlying cipher context */ \
+ uint32 iv[PRE##_BLKSZ / 4]; /* Previous ciphertext or IV */ \
+} pre##_cbcctx; \
+ \
+/* --- @pre_cbcgetiv@ --- * \
+ * \
+ * Arguments: @const pre_cbcctx *ctx@ = pointer to CBC context block \
+ * @void *iv@ = pointer to output data block \
+ * \
+ * Returns: --- \
+ * \
+ * Use: Reads the currently set IV. Reading and setting an IV \
+ * is transparent to the CBC encryption or decryption \
+ * process. \
+ */ \
+ \
+extern void pre##_cbcgetiv(const pre##_cbcctx */*ctx*/, \
+ void */*iv*/); \
+ \
+/* --- @pre_cbcsetiv@ --- * \
+ * \
+ * Arguments: @pre_cbcctx *ctx@ = pointer to CBC context block \
+ * @cnost void *iv@ = pointer to IV to set \
+ * \
+ * Returns: --- \
+ * \
+ * Use: Sets the IV to use for subsequent encryption. \
+ */ \
+ \
+extern void pre##_cbcsetiv(pre##_cbcctx */*ctx*/, \
+ const void */*iv*/); \
+ \
+/* --- @pre_cbcsetkey@ --- * \
+ * \
+ * Arguments: @pre_cbcctx *ctx@ = pointer to CBC context block \
+ * @const pre_ctx *k@ = pointer to cipher context \
+ * \
+ * Returns: --- \
+ * \
+ * Use: Sets the CBC context to use a different cipher key. \
+ */ \
+ \
+extern void pre##_cbcsetkey(pre##_cbcctx */*ctx*/, \
+ const pre##_ctx */*k*/); \
+ \
+/* --- @pre_cbcinit@ --- * \
+ * \
+ * Arguments: @pre_cbcctx *ctx@ = pointer to cipher context \
+ * @const void *key@ = pointer to the key buffer \
+ * @size_t sz@ = size of the key \
+ * @const void *iv@ = pointer to initialization vector \
+ * \
+ * Returns: --- \
+ * \
+ * Use: Initializes a CBC context ready for use. The @iv@ \
+ * argument may be passed as a null pointer to set a zero \
+ * IV. Apart from that, this call is equivalent to calls \
+ * to @pre_init@, @pre_cbcsetkey@ and @pre_cbcsetiv@. \
+ */ \
+ \
+extern void pre##_cbcinit(pre##_cbcctx */*ctx*/, \
+ const void */*key*/, size_t /*sz*/, \
+ const void */*iv*/); \
+ \
+/* --- @pre_cbcencrypt@ --- * \
+ * \
+ * Arguments: @pre_cbcctx *ctx@ = pointer to CBC context block \
+ * @const void *src@ = pointer to source data \
+ * @void *dest@ = pointer to destination data \
+ * @size_t sz@ = size of block to be encrypted \
+ * \
+ * Returns: --- \
+ * \
+ * Use: Encrypts a block with a block cipher in CBC mode, with \
+ * ciphertext stealing and other clever tricks. \
+ * Essentially, data can be encrypted in arbitrary sized \
+ * chunks, although decryption must use the same chunks. \
+ */ \
+ \
+extern void pre##_cbcencrypt(pre##_cbcctx */*ctx*/, \
+ const void */*src*/, void */*dest*/, \
+ size_t /*sz*/); \
+ \
+/* --- @pre_cbcdecrypt@ --- * \
+ * \
+ * Arguments: @pre_cbcctx *ctx@ = pointer to CBC context block \
+ * @const void *src@ = pointer to source data \
+ * @void *dest@ = pointer to destination data \
+ * @size_t sz@ = size of block to be encrypted \
+ * \
+ * Returns: --- \
+ * \
+ * Use: Decrypts a block with a block cipher in CBC mode, with \
+ * ciphertext stealing and other clever tricks. \
+ * Essentially, data can be encrypted in arbitrary sized \
+ * chunks, although decryption must use the same chunks. \
+ */ \
+ \
+extern void pre##_cbcdecrypt(pre##_cbcctx */*ctx*/, \
+ const void */*src*/, void */*dest*/, \
+ size_t /*sz*/); \
+ \
+/* --- Generic cipher interface --- */ \
+ \
+extern const gccipher pre##_cbc;
+
+/*----- That's all, folks -------------------------------------------------*/
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif
projects / u / mdw / catacomb / blobdiff