X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/blobdiff_plain/ba6e6b64033b1f9de49feccb5c9cd438354481f7..0f00dc4c8eb47e67bc0f148c2dd109f73a451e0a:/mgf.h

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-/* -*-c-*-
- *
- * $Id: mgf.h,v 1.2 2004/04/08 01:36:15 mdw Exp $
- *
- * The MGF mask generation 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.
- */
-
-/*----- Notes on the MGF-1 mask generating function -----------------------*
- *
- * The idea of a mask-generating function is that given an input of arbitrary
- * size, it can emit a pseudorandom output `mask' of arbitrary size.  This is
- * used in PKCS#1 OAEP (RFC2437).  My recommendation would be to use a decent
- * stream cipher instead, like RC4 or SEAL.  MGF-1 isn't very fast.
- */
-
-#ifndef CATACOMB_MGF_H
-#define CATACOMB_MGF_H
-
-#ifdef __cplusplus
-  extern "C" {
-#endif
-
-/*----- Header files ------------------------------------------------------*/
-
-#include <mLib/bits.h>
-
-#ifndef CATACOMB_GCIPHER_H
-#  include "gcipher.h"
-#endif
-
-#ifndef CATACOMB_GRAND_H
-#  include "grand.h"
-#endif
-
-/*----- Macros ------------------------------------------------------------*/
-
-#define MGF_DECL(PRE, pre)						\
-									\
-/* --- An MGF generation context --- */					\
-									\
-typedef struct pre##_mgfctx {						\
-  pre##_ctx k;				/* Underlying key context */	\
-  uint32 c;				/* Counter */			\
-  octet buf[PRE##_HASHSZ];		/* Output buffer */		\
-  size_t bsz;				/* Size of buffered data */	\
-} pre##_mgfctx;								\
-									\
-/* --- Other useful constants --- */					\
-									\
-extern const octet pre##_mgfkeysz[];					\
-									\
-/* --- @pre_mgfkeybegin@, @pre_mgfkeyadd@ --- *				\
- *									\
- * Arguments:	@pre_mgfctx *k@ = pointer to context to initialize	\
- *		@const void *p@ = pointer to data to contribute		\
- *		@size_t sz@ = size of data to contribute		\
- *									\
- * Returns:	---							\
- *									\
- * Use:		A multi-step keying procedure for initializing an MGF	\
- *		context.  The data is contributed to a hashing context	\
- *		which is then used for mask generation.  If you only	\
- *		have a fixed buffer, you can save a lot of effort by	\
- *		simply calling @pre_mgfinit@.				\
- */									\
-									\
-extern void pre##_mgfkeybegin(pre##_mgfctx */*k*/);			\
-extern void pre##_mgfkeyadd(pre##_mgfctx */*k*/,			\
-			    const void */*p*/, size_t /*sz*/);		\
-									\
-/* ---- @pre_mgfinit@ --- *						\
- *									\
- * Arguments:	@pre_mgfctx *k@ = pointer to context to initialize	\
- *		@const void *p@ = pointer to data to contribute		\
- *		@size_t sz@ = size of data to contribute		\
- *									\
- * Returns:	---							\
- *									\
- * Use:		A simpler interface to initialization if all of your	\
- *		keying material is in one place.			\
- */									\
-									\
-extern void pre##_mgfinit(pre##_mgfctx */*k*/,				\
-			  const void */*p*/, size_t /*sz*/);		\
-									\
-/* --- @pre_mgfencrypt@ --- *						\
- *									\
- * Arguments:	@pre_mgfctx *k@ = pointer to masking context		\
- *		@const void *s@ = pointer to source buffer		\
- *		@void *d@ = pointer to destination buffer		\
- *		@size_t sz@ = size of buffers				\
- *									\
- * Returns:	---							\
- *									\
- * Use:		Outputs pseudorandom data, or masks an input buffer.	\
- *									\
- *		If @s@ is nonzero, the source material is exclusive-	\
- *		orred with the generated mask.  If @d@ is zero, the	\
- *		generator is simply spun around for a while, which	\
- *		isn't very useful.					\
- */									\
-									\
-extern void pre##_mgfencrypt(pre##_mgfctx */*k*/, const void */*s*/,	\
-			     void */*d*/, size_t /*sz*/);		\
-									\
-/* --- @pre_mgfsetindex@ --- *						\
- *									\
- * Arguments:	@pre_mgfctx *k@ = pointer to masking context		\
- *		@uint32 *c@ = new index to set				\
- *									\
- * Returns:	---							\
- *									\
- * Use:		Sets a new index.  This may be used to step around the	\
- *		output stream in a rather crude way.			\
- */									\
-									\
-extern void pre##_mgfsetindex(pre##_mgfctx */*k*/, uint32 /*c*/);	\
-									\
-/* --- @pre_mgfrand@ --- *						\
- *									\
- * Arguments:	@const void *k@ = pointer to key material		\
- *		@size_t sz@ = size of key material			\
- *									\
- * Returns:	Pointer to a generic random number generator instance.	\
- *									\
- * Use:		Creates a random number interface wrapper around an	\
- *		MGF-1-mode hash function.				\
- */									\
-									\
-extern grand *pre##_mgfrand(const void */*k*/, size_t /*sz*/);		\
-									\
-/* --- Generic cipher interface --- */					\
-									\
-extern const gccipher pre##_mgf;
-
-/*----- That's all, folks -------------------------------------------------*/
-
-#ifdef __cplusplus
-  }
-#endif
-
-#endif