X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/blobdiff_plain/ba6e6b64033b1f9de49feccb5c9cd438354481f7..0f00dc4c8eb47e67bc0f148c2dd109f73a451e0a:/sha256.h

diff --git a/sha256.h b/sha256.h
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-/* -*-c-*-
- *
- * $Id$
- *
- * Implementation of the SHA-256 hash 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 SHA-256 hash function --------------------------------*
- *
- * SHA-1 (Secure Hash Algorithm) was designed by the NSA, for use with the
- * Digital Signature Algorithm.  This is an evolution with a larger output
- * size, intended to provide security commensurate with 128-bit AES.  At the
- * time of writing, SHA-256 is very new, and can't be trusted too far.
- */
-
-#ifndef CATACOMB_SHA256_H
-#define CATACOMB_SHA256_H
-#define CATACOMB_SHA224_H
-
-#ifdef __cplusplus
-  extern "C" {
-#endif
-
-/*----- Header files ------------------------------------------------------*/
-
-#include <mLib/bits.h>
-
-#ifndef CATACOMB_GHASH_H
-#  include "ghash.h"
-#endif
-
-/*----- Magic numbers -----------------------------------------------------*/
-
-#define SHA256_BUFSZ 64
-#define SHA256_HASHSZ 32
-#define SHA256_STATESZ 32
-
-#define SHA224_BUFSZ 64
-#define SHA224_HASHSZ 28
-#define SHA224_STATESZ 32
-
-/*----- Data structures ---------------------------------------------------*/
-
-typedef struct sha256_ctx {
-  uint32 a, b, c, d, e, f, g, h;	/* Chaining variables */
-  uint32 nl, nh;			/* Byte count so far */
-  unsigned off;				/* Offset into buffer */
-  octet buf[SHA256_BUFSZ];		/* Accumulation buffer */
-} sha256_ctx, sha224_ctx;
-
-/*----- Functions provided ------------------------------------------------*/
-
-/* --- @sha256_compress@, @sha224_compress@ --- *
- *
- * Arguments:	@sha256_ctx *ctx@ = pointer to context block
- *		@const void *sbuf@ = pointer to buffer of appropriate size
- *
- * Returns:	---
- *
- * Use:		SHA-256 compression function.
- */
-
-extern void sha256_compress(sha256_ctx */*ctx*/, const void */*sbuf*/);
-#define sha224_compress sha256_compress
-
-/* --- @sha256_init@, @sha224_init@ --- *
- *
- * Arguments:	@sha256_ctx *ctx@ = pointer to context block to initialize
- *
- * Returns:	---
- *
- * Use:		Initializes a context block ready for hashing.
- */
-
-extern void sha256_init(sha256_ctx */*ctx*/);
-extern void sha224_init(sha256_ctx */*ctx*/);
-
-/* --- @sha256_set@, @sha224_set@ --- *
- *
- * Arguments:	@sha256_ctx *ctx@ = pointer to context block
- *		@const void *buf@ = pointer to state buffer
- *		@unsigned long count@ = current count of bytes processed
- *
- * Returns:	---
- *
- * Use:		Initializes a context block from a given state.  This is
- *		useful in cases where the initial hash state is meant to be
- *		secret, e.g., for NMAC and HMAC support.
- */
-
-extern void sha256_set(sha256_ctx */*ctx*/, const void */*buf*/,
-		       unsigned long /*count*/);
-#define sha224_set sha256_set
-
-/* --- @sha256_hash@, @sha224_hash@ --- *
- *
- * Arguments:	@sha256_ctx *ctx@ = pointer to context block
- *		@const void *buf@ = buffer of data to hash
- *		@size_t sz@ = size of buffer to hash
- *
- * Returns:	---
- *
- * Use:		Hashes a buffer of data.  The buffer may be of any size and
- *		alignment.
- */
-
-extern void sha256_hash(sha256_ctx */*ctx*/,
-			const void */*buf*/, size_t /*sz*/);
-#define sha224_hash sha256_hash
-
-/* --- @sha256_done@, @sha224_done@ --- *
- *
- * Arguments:	@sha256_ctx *ctx@ = pointer to context block
- *		@void *hash@ = pointer to output buffer
- *
- * Returns:	---
- *
- * Use:		Returns the hash of the data read so far.
- */
-
-extern void sha256_done(sha256_ctx */*ctx*/, void */*hash*/);
-extern void sha224_done(sha256_ctx */*ctx*/, void */*hash*/);
-
-/* --- @sha256_state@, @sha224_state@ --- *
- *
- * Arguments:	@sha256_ctx *ctx@ = pointer to context
- *		@void *state@ = pointer to buffer for current state
- *
- * Returns:	Number of bytes written to the hash function so far.
- *
- * Use:		Returns the current state of the hash function such that
- *		it can be passed to @sha256_set@.
- */
-
-extern unsigned long sha256_state(sha256_ctx */*ctx*/, void */*state*/);
-#define sha224_state sha256_state
-
-/*----- Generic hash interface --------------------------------------------*/
-
-extern const gchash sha256;
-extern const gchash sha224;
-
-/*----- That's all, folks -------------------------------------------------*/
-
-#ifdef __cplusplus
-  }
-#endif
-
-#endif