+++ /dev/null
-/* -*-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