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/* md5.h - Declaration of functions and data types used for MD5 sum

   computing library functions.

   Copyright 1995, 1996, 2000 Free Software Foundation, Inc.

   NOTE: The canonical source of this file is maintained with the GNU C

   Library.  Bugs can be reported to bug-glibc@prep.ai.mit.edu.

   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 2, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#ifndef _MD5_H

#define _MD5_H 1

#include <stdio.h>

#if defined HAVE_LIMITS_H || _LIBC

# include <limits.h>

#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.  */

#ifdef _LIBC

# include <sys/types.h>

typedef u_int32_t md5_uint32;

#else

#  define INT_MAX_32_BITS 2147483647

/* If UINT_MAX isn't defined, assume it's a 32-bit type.

   This should be valid for all systems GNU cares about because

   that doesn't include 16-bit systems, and only modern systems

   (that certainly have <limits.h>) have 64+-bit integral types.  */

# ifndef INT_MAX

#  define INT_MAX INT_MAX_32_BITS

# endif

# if INT_MAX == INT_MAX_32_BITS

   typedef unsigned int md5_uint32;

# else

#  if SHRT_MAX == INT_MAX_32_BITS

    typedef unsigned short md5_uint32;

#  else

#   if LONG_MAX == INT_MAX_32_BITS

     typedef unsigned long md5_uint32;

#   else

     /* The following line is intended to evoke an error.

        Using #error is not portable enough.  */

     "Cannot determine unsigned 32-bit data type."

#   endif

#  endif

# endif

#endif

#undef __P

#if defined (__STDC__) && __STDC__

#define __P(x) x

#else

#define __P(x) ()

#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;

  char buffer[128];

};

/*

 * 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 __P ((struct md5_ctx *ctx));

/* 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 __P ((const void *buffer, size_t len,

                                    struct md5_ctx *ctx));

/* 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 __P ((const void *buffer, size_t len,

                                    struct md5_ctx *ctx));

/* 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.

   IMPORTANT: On some systems it is required that RESBUF is correctly

   aligned for a 32 bits value.  */

extern void *md5_finish_ctx __P ((struct md5_ctx *ctx, void *resbuf));

/* 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.

   IMPORTANT: On some systems it is required that RESBUF is correctly

   aligned for a 32 bits value.  */

extern void *md5_read_ctx __P ((const struct md5_ctx *ctx, void *resbuf));

/* 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 __P ((FILE *stream, void *resblock));

/* 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 __P ((const char *buffer, size_t len, void *resblock));

#endif