+++ /dev/null
-/* -*-c-*-
- *
- * $Id: hmac.h,v 1.7 2004/04/08 01:36:15 mdw Exp $
- *
- * Generic code for HMAC and NMAC
- *
- * (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 HMAC and NMAC constructions --------------------------*
- *
- * Designed by Mihir Bellare, Ran Canetti and Hugo Krawczyk, NMAC is a method
- * for constructing keyed message authentication algorithms from unkeyed hash
- * functions. It has been proven to provide useful security given reasonable
- * assumptions about the underlying hash function. HMAC is an alternative
- * formulation which doesn't require low-level access to the hash function's
- * implementation. NMAC was designed to allow MD5 has a suitable underlying
- * hash function, even though doubts were already being raised about its
- * collision resistance.
- */
-
-#ifndef CATACOMB_HMAC_H
-#define CATACOMB_HMAC_H
-
-#ifdef __cplusplus
- extern "C" {
-#endif
-
-/*----- Header files ------------------------------------------------------*/
-
-#include <stddef.h>
-
-#include <mLib/bits.h>
-
-#ifndef CATACOMB_GMAC_H
-# include "gmac.h"
-#endif
-
-/*----- Macros ------------------------------------------------------------*/
-
-/* --- @HMAC_DECL@ --- *
- *
- * Arguments: @PRE@, @pre@ = prefixes for the underlying hash function
- *
- * Use: Creates declarations for the HMAC and NMAC functions.
- */
-
-#define HMAC_DECL(PRE, pre) \
- \
-/* --- An HMAC or NMAC key --- */ \
- \
-typedef struct pre##_mackey { \
- octet ochain[PRE##_STATESZ]; /* Chaining for outer hash */ \
- unsigned ocount; /* Byte count for outer hash */ \
- octet ichain[PRE##_STATESZ]; /* Chaining for inner hash */ \
- unsigned icount; /* Byte count for inner hash */ \
-} pre##_mackey; \
- \
-/* --- An HMAC or NMAC hashing context --- */ \
- \
-typedef struct pre##_macctx { \
- pre##_ctx ctx; /* Context for main hashing */ \
- octet chain[PRE##_STATESZ]; /* Chaining for outer hash */ \
- unsigned count; /* Byte count for outer hash */ \
-} pre##_macctx; \
- \
-/* --- Other useful constants --- */ \
- \
-extern const octet pre##_hmackeysz[]; \
-extern const octet pre##_nmackeysz[]; \
-extern const octet pre##_sslmackeysz[]; \
- \
-/* --- @pre_nmacinit@ --- * \
- * \
- * Arguments: @pre_macctx *key@ = pointer to a MAC key object \
- * @const void *ok@ = pointer to outer hash init vector \
- * @const void *ik@ = pointer to inner hash init vector \
- * \
- * Returns: --- \
- * \
- * Use: Initializes a MAC key for doing NMAC hashing. \
- */ \
- \
-extern void pre##_nmacinit(pre##_mackey */*key*/, \
- const void */*ok*/, const void */*ik*/); \
- \
-/* --- @pre_hmacinit@ --- * \
- * \
- * Arguments: @pre_mackey *key@ = pointer to MAC key object \
- * @const void *k@ = pointer to key to use \
- * @size_t sz@ = size of key data \
- * \
- * Returns: --- \
- * \
- * Use: Initializes a MAC key for doing HMAC hashing. Keys \
- * longer than the hash function's output size aren't very \
- * useful, but are accepted. Keys longer than the hash's \
- * block size are also accepted; they are hashed before \
- * use, as specified in RFC2104. \
- */ \
- \
-extern void pre##_hmacinit(pre##_mackey */*key*/, \
- const void */*k*/, size_t /*sz*/); \
- \
-/* --- @pre_sslmacinit@ --- * \
- * \
- * Arguments: @pre_mackey *key@ = pointer to MAC key object \
- * @const void *k@ = pointer to key to use \
- * @size_t sz@ = size of key data \
- * \
- * Returns: --- \
- * \
- * Use: Initializes a MAC key for doing hasing using the SSL3 \
- * variant of HMAC. \
- */ \
- \
-extern void pre##_sslmacinit(pre##_mackey */*key*/, \
- const void */*k*/, size_t /*sz*/); \
- \
-/* --- @pre_macinit@ --- * \
- * \
- * Arguments: @pre_macctx *ctx@ = pointer to MAC context block \
- * @const pre_mackey *key@ = pointer to MAC key block \
- * \
- * Returns: --- \
- * \
- * Use: Instantiates a MAC context from a key block. \
- */ \
- \
-extern void pre##_macinit(pre##_macctx */*ctx*/, \
- const pre##_mackey */*key*/); \
- \
-/* --- @pre_machash@ --- * \
- * \
- * Arguments: @pre_macctx *ctx@ = pointer to MAC context block \
- * @const void *buf@ = pointer to buffer \
- * @size_t sz@ = size of the buffer \
- * \
- * Returns: --- \
- * \
- * Use: Hashes a buffer. \
- */ \
- \
-extern void pre##_machash(pre##_macctx */*ctx*/, \
- const void */*buf*/, size_t /*sz*/); \
- \
-/* --- @pre_macdone@ --- * \
- * \
- * Arguments: @pre_macctx *ctx@ = pointer to MAC context block \
- * @void *mac@ = pointer to buffer to receive MAC \
- * \
- * Returns: --- \
- * \
- * Use: Returns the result of a MAC computation. \
- */ \
- \
-extern void pre##_macdone(pre##_macctx */*ctx*/, void */*mac*/); \
- \
-/* --- Generic MAC interface --- */ \
- \
-extern const gcmac pre##_hmac; \
-extern const gcmac pre##_nmac; \
-extern const gcmac pre##_sslmac;
-
-/*----- That's all, folks -------------------------------------------------*/
-
-#ifdef __cplusplus
- }
-#endif
-
-#endif
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