[bpt/emacs.git] / lib / md5.h

/* Declaration of functions and data types used for MD5 sum computing
   library functions.
   Copyright (C) 1995-1997, 1999-2001, 2004-2006, 2008-2011 Free Software
   Foundation, Inc.
   This file is part of the GNU C Library.

   This program is free software; you can redistribute it and/or modify it
   under the terms of the GNU General Public License as published by the
   Free Software Foundation; either version 3, or (at your option) any
   later version.

   This program 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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software Foundation,
   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */

#ifndef _MD5_H
#define _MD5_H 1

#include <stdio.h>

#define MD5_DIGEST_SIZE 16
#define MD5_BLOCK_SIZE 64

#ifndef __GNUC_PREREQ
# if defined __GNUC__ && defined __GNUC_MINOR__
#  define __GNUC_PREREQ(maj, min)                                       \
  ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
# else
#  define __GNUC_PREREQ(maj, min) 0
# endif
#endif

#ifndef __THROW
# if defined __cplusplus && __GNUC_PREREQ (2,8)
#  define __THROW       throw ()
# else
#  define __THROW
# endif
#endif

#ifndef _LIBC
# define __md5_buffer md5_buffer
# define __md5_finish_ctx md5_finish_ctx
# define __md5_init_ctx md5_init_ctx
# define __md5_process_block md5_process_block
# define __md5_process_bytes md5_process_bytes
# define __md5_read_ctx md5_read_ctx
# define __md5_stream md5_stream
#endif

# ifdef __cplusplus
extern "C" {
# endif

/* The following contortions are an attempt to use the C preprocessor
   to determine an unsigned integral type that is 32 bits wide.  An
   alternative approach is to use autoconf's AC_CHECK_SIZEOF macro, but
   doing that would require that the configure script compile and *run*
   the resulting executable.  Locally running cross-compiled executables
   is usually not possible.  */

#if defined _LIBC
# include <stdint.h>
typedef uint32_t md5_uint32;
#else
# if defined __STDC__ && __STDC__
#  define UINT_MAX_32_BITS 4294967295U
# else
#  define UINT_MAX_32_BITS 0xFFFFFFFF
# endif

# include <limits.h>

# if UINT_MAX == UINT_MAX_32_BITS
   typedef unsigned int md5_uint32;
# else
#  if USHRT_MAX == UINT_MAX_32_BITS
    typedef unsigned short md5_uint32;
#  else
#   if ULONG_MAX == UINT_MAX_32_BITS
     typedef unsigned long md5_uint32;
#   else
     /* A machine this weird should have <stdint.h>.  */
#    include <stdint.h>
     typedef uint32_t md5_uint32;
#   endif
#  endif
# endif
#endif

/* Structure to save state of computation between the single steps.  */
struct md5_ctx
{
  md5_uint32 A;
  md5_uint32 B;
  md5_uint32 C;
  md5_uint32 D;

  md5_uint32 total[2];
  md5_uint32 buflen;
  md5_uint32 buffer[32];
};

/*
 * The following three functions are build up the low level used in
 * the functions `md5_stream' and `md5_buffer'.
 */

/* Initialize structure containing state of computation.
   (RFC 1321, 3.3: Step 3)  */
extern void __md5_init_ctx (struct md5_ctx *ctx) __THROW;

/* Starting with the result of former calls of this function (or the
   initialization function update the context for the next LEN bytes
   starting at BUFFER.
   It is necessary that LEN is a multiple of 64!!! */
extern void __md5_process_block (const void *buffer, size_t len,
                                 struct md5_ctx *ctx) __THROW;

/* Starting with the result of former calls of this function (or the
   initialization function update the context for the next LEN bytes
   starting at BUFFER.
   It is NOT required that LEN is a multiple of 64.  */
extern void __md5_process_bytes (const void *buffer, size_t len,
                                 struct md5_ctx *ctx) __THROW;

/* Process the remaining bytes in the buffer and put result from CTX
   in first 16 bytes following RESBUF.  The result is always in little
   endian byte order, so that a byte-wise output yields to the wanted
   ASCII representation of the message digest.  */
extern void *__md5_finish_ctx (struct md5_ctx *ctx, void *resbuf) __THROW;


/* Put result from CTX in first 16 bytes following RESBUF.  The result is
   always in little endian byte order, so that a byte-wise output yields
   to the wanted ASCII representation of the message digest.  */
extern void *__md5_read_ctx (const struct md5_ctx *ctx, void *resbuf) __THROW;


/* Compute MD5 message digest for bytes read from STREAM.  The
   resulting message digest number will be written into the 16 bytes
   beginning at RESBLOCK.  */
extern int __md5_stream (FILE *stream, void *resblock) __THROW;

/* Compute MD5 message digest for LEN bytes beginning at BUFFER.  The
   result is always in little endian byte order, so that a byte-wise
   output yields to the wanted ASCII representation of the message
   digest.  */
extern void *__md5_buffer (const char *buffer, size_t len,
                           void *resblock) __THROW;

# ifdef __cplusplus
}
# endif

#endif /* md5.h */
Commit	Line	Data
693c4692 GM	1	/* Declaration of functions and data types used for MD5 sum computing
693c4692 GM	2	library functions.
942f733f PE	3	Copyright (C) 1995-1997, 1999-2001, 2004-2006, 2008-2011 Free Software
	4	Foundation, Inc.
	5	This file is part of the GNU C Library.
693c4692	6
942f733f PE	7	This program is free software; you can redistribute it and/or modify it
	8	under the terms of the GNU General Public License as published by the
	9	Free Software Foundation; either version 3, or (at your option) any
	10	later version.
693c4692	11
942f733f	12	This program is distributed in the hope that it will be useful,
693c4692	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
942f733f PE	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
942f733f PE	15	GNU General Public License for more details.
693c4692	16
942f733f PE	17	You should have received a copy of the GNU General Public License
	18	along with this program; if not, write to the Free Software Foundation,
	19	Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
693c4692 GM	20
	21	#ifndef _MD5_H
	22	#define _MD5_H 1
	23
	24	#include <stdio.h>
	25
942f733f PE	26	#define MD5_DIGEST_SIZE 16
	27	#define MD5_BLOCK_SIZE 64
	28
	29	#ifndef __GNUC_PREREQ
	30	# if defined __GNUC__ && defined __GNUC_MINOR__
	31	# define __GNUC_PREREQ(maj, min) \
	32	((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
	33	# else
	34	# define __GNUC_PREREQ(maj, min) 0
	35	# endif
	36	#endif
	37
	38	#ifndef __THROW
	39	# if defined __cplusplus && __GNUC_PREREQ (2,8)
	40	# define __THROW throw ()
	41	# else
	42	# define __THROW
	43	# endif
	44	#endif
	45
	46	#ifndef _LIBC
	47	# define __md5_buffer md5_buffer
	48	# define __md5_finish_ctx md5_finish_ctx
	49	# define __md5_init_ctx md5_init_ctx
	50	# define __md5_process_block md5_process_block
	51	# define __md5_process_bytes md5_process_bytes
	52	# define __md5_read_ctx md5_read_ctx
	53	# define __md5_stream md5_stream
693c4692 GM	54	#endif
693c4692 GM	55
942f733f PE	56	# ifdef __cplusplus
	57	extern "C" {
	58	# endif
	59
693c4692 GM	60	/* The following contortions are an attempt to use the C preprocessor
	61	to determine an unsigned integral type that is 32 bits wide. An
	62	alternative approach is to use autoconf's AC_CHECK_SIZEOF macro, but
	63	doing that would require that the configure script compile and run
	64	the resulting executable. Locally running cross-compiled executables
	65	is usually not possible. */
	66
942f733f PE	67	#if defined _LIBC
	68	# include <stdint.h>
	69	typedef uint32_t md5_uint32;
693c4692 GM	70	#else
	71	# if defined __STDC__ && __STDC__
	72	# define UINT_MAX_32_BITS 4294967295U
	73	# else
	74	# define UINT_MAX_32_BITS 0xFFFFFFFF
	75	# endif
	76
942f733f	77	# include <limits.h>
693c4692 GM	78
	79	# if UINT_MAX == UINT_MAX_32_BITS
	80	typedef unsigned int md5_uint32;
	81	# else
	82	# if USHRT_MAX == UINT_MAX_32_BITS
	83	typedef unsigned short md5_uint32;
	84	# else
	85	# if ULONG_MAX == UINT_MAX_32_BITS
	86	typedef unsigned long md5_uint32;
	87	# else
942f733f PE	88	/* A machine this weird should have <stdint.h>. */
	89	# include <stdint.h>
	90	typedef uint32_t md5_uint32;
693c4692 GM	91	# endif
	92	# endif
	93	# endif
	94	#endif
	95
693c4692 GM	96	/* Structure to save state of computation between the single steps. */
	97	struct md5_ctx
	98	{
	99	md5_uint32 A;
	100	md5_uint32 B;
	101	md5_uint32 C;
	102	md5_uint32 D;
	103
	104	md5_uint32 total[2];
	105	md5_uint32 buflen;
942f733f	106	md5_uint32 buffer[32];
693c4692 GM	107	};
	108
	109	/*
	110	* The following three functions are build up the low level used in
	111	* the functions `md5_stream' and `md5_buffer'.
	112	*/
	113
	114	/* Initialize structure containing state of computation.
	115	(RFC 1321, 3.3: Step 3) */
942f733f	116	extern void __md5_init_ctx (struct md5_ctx *ctx) __THROW;
693c4692 GM	117
	118	/* Starting with the result of former calls of this function (or the
	119	initialization function update the context for the next LEN bytes
	120	starting at BUFFER.
	121	It is necessary that LEN is a multiple of 64!!! */
942f733f PE	122	extern void __md5_process_block (const void *buffer, size_t len,
942f733f PE	123	struct md5_ctx *ctx) __THROW;
693c4692 GM	124
	125	/* Starting with the result of former calls of this function (or the
	126	initialization function update the context for the next LEN bytes
	127	starting at BUFFER.
	128	It is NOT required that LEN is a multiple of 64. */
942f733f PE	129	extern void __md5_process_bytes (const void *buffer, size_t len,
942f733f PE	130	struct md5_ctx *ctx) __THROW;
693c4692 GM	131
	132	/* Process the remaining bytes in the buffer and put result from CTX
	133	in first 16 bytes following RESBUF. The result is always in little
	134	endian byte order, so that a byte-wise output yields to the wanted
942f733f PE	135	ASCII representation of the message digest. */
942f733f PE	136	extern void __md5_finish_ctx (struct md5_ctx ctx, void *resbuf) __THROW;
693c4692 GM	137
	138
	139	/* Put result from CTX in first 16 bytes following RESBUF. The result is
	140	always in little endian byte order, so that a byte-wise output yields
942f733f PE	141	to the wanted ASCII representation of the message digest. */
942f733f PE	142	extern void __md5_read_ctx (const struct md5_ctx ctx, void *resbuf) __THROW;
693c4692 GM	143
	144
	145	/* Compute MD5 message digest for bytes read from STREAM. The
	146	resulting message digest number will be written into the 16 bytes
	147	beginning at RESBLOCK. */
942f733f	148	extern int __md5_stream (FILE stream, void resblock) __THROW;
693c4692 GM	149
	150	/* Compute MD5 message digest for LEN bytes beginning at BUFFER. The
	151	result is always in little endian byte order, so that a byte-wise
	152	output yields to the wanted ASCII representation of the message
	153	digest. */
942f733f PE	154	extern void __md5_buffer (const char buffer, size_t len,
	155	void *resblock) __THROW;
	156
	157	# ifdef __cplusplus
	158	}
	159	# endif
693c4692 GM	160
693c4692 GM	161	#endif /* md5.h */