/* md5.h - Declaration of functions and data types used for MD5 sum
  computing library functions.
  Copyright (C) 1995-2024 Free Software Foundation, Inc.
  NOTE: The canonical source of this file is maintained with the GNU C
  Library.  Bugs can be reported to [email protected].

  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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */

#ifndef _MD5_H
#define _MD5_H 1

#ifdef USE_SYSTEM_MD5
#include_next <md5.h>
#else

#include <stdio.h>

#if defined HAVE_LIMITS_H || _LIBC
# include <limits.h>
#endif

#include "ansidecl.h"

/* 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;
typedef uintptr_t md5_uintptr;
#elif defined (HAVE_SYS_TYPES_H) && defined (HAVE_STDINT_H)
#include <stdint.h>
#include <sys/types.h>
typedef uint32_t md5_uint32;
typedef uintptr_t md5_uintptr;
#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
/* We have to make a guess about the integer type equivalent in size
  to pointers which should always be correct.  */
typedef unsigned long int md5_uintptr;
#endif

#ifdef __cplusplus
extern "C" {
#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] ATTRIBUTE_ALIGNED_ALIGNOF(md5_uint32);
};

/*
* 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);

/* 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);

/* 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);

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

#ifdef __cplusplus
}
#endif

#endif // USE_SYSTEM_MD5

#endif

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