dvdread/md5.h

   1 /* -*- c-basic-offset: 2; indent-tabs-mode: nil -*- */
   2 /* md5.h - Declaration of functions and data types used for MD5 sum
   3    computing library functions.
   4    Copyright (C) 1995, 1996, 1999 Free Software Foundation, Inc.
   5    NOTE: The canonical source of this file is maintained with the GNU C
   6    Library.  Bugs can be reported to bug-glibc@prep.ai.mit.edu.
   7
   8    This program is free software; you can redistribute it and/or modify it
   9    under the terms of the GNU General Public License as published by the
  10    Free Software Foundation; either version 2, or (at your option) any
  11    later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software Foundation,
  20    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  21
  22 #ifndef _MD5_H
  23 #define _MD5_H 1
  24
  25 #include <stdio.h>
  26
  27 #if defined HAVE_LIMITS_H || _LIBC
  28 # include <limits.h>
  29 #endif
  30
  31 /* The following contortions are an attempt to use the C preprocessor
  32    to determine an unsigned integral type that is 32 bits wide.  An
  33    alternative approach is to use autoconf's AC_CHECK_SIZEOF macro, but
  34    doing that would require that the configure script compile and *run*
  35    the resulting executable.  Locally running cross-compiled executables
  36    is usually not possible.  */
  37
  38 #ifdef _LIBC
  39 # include <sys/types.h>
  40 typedef u_int32_t md5_uint32;
  41 #else
  42 # if defined __STDC__ && __STDC__
  43 #  define UINT_MAX_32_BITS 4294967295U
  44 # else
  45 #  define UINT_MAX_32_BITS 0xFFFFFFFF
  46 # endif
  47
  48 /* If UINT_MAX isn't defined, assume it's a 32-bit type.
  49    This should be valid for all systems GNU cares about because
  50    that doesn't include 16-bit systems, and only modern systems
  51    (that certainly have <limits.h>) have 64+-bit integral types.  */
  52
  53 # ifndef UINT_MAX
  54 #  define UINT_MAX UINT_MAX_32_BITS
  55 # endif
  56
  57 # if UINT_MAX == UINT_MAX_32_BITS
  58 typedef unsigned int md5_uint32;
  59 # else
  60 #  if USHRT_MAX == UINT_MAX_32_BITS
  61 typedef unsigned short md5_uint32;
  62 #  else
  63 #   if ULONG_MAX == UINT_MAX_32_BITS
  64 typedef unsigned long md5_uint32;
  65 #   else
  66 /* The following line is intended to evoke an error.
  67    Using #error is not portable enough.  */
  68 "Cannot determine unsigned 32-bit data type."
  69 #   endif
  70 #  endif
  71 # endif
  72 #endif
  73
  74 #undef __P
  75 #if defined (__STDC__) && __STDC__
  76 #define __P(x) x
  77 #else
  78 #define __P(x) ()
  79 #endif
  80
  81 /* Structure to save state of computation between the single steps.  */
  82 struct md5_ctx
  83 {
  84   md5_uint32 A;
  85   md5_uint32 B;
  86   md5_uint32 C;
  87   md5_uint32 D;
  88
  89   md5_uint32 total[2];
  90   md5_uint32 buflen;
  91   char buffer[128];
  92 };
  93
  94 /*
  95  * The following three functions are build up the low level used in
  96  * the functions `md5_stream' and `md5_buffer'.
  97  */
  98
  99 /* Initialize structure containing state of computation.
 100    (RFC 1321, 3.3: Step 3)  */
 101 extern void md5_init_ctx __P ((struct md5_ctx *ctx));
 102
 103 /* Starting with the result of former calls of this function (or the
 104    initialization function update the context for the next LEN bytes
 105    starting at BUFFER.
 106    It is necessary that LEN is a multiple of 64!!! */
 107 extern void md5_process_block __P ((const void *buffer, size_t len,
 108                                     struct md5_ctx *ctx));
 109
 110 /* Starting with the result of former calls of this function (or the
 111    initialization function update the context for the next LEN bytes
 112    starting at BUFFER.
 113    It is NOT required that LEN is a multiple of 64.  */
 114 extern void md5_process_bytes __P ((const void *buffer, size_t len,
 115                                     struct md5_ctx *ctx));
 116
 117 /* Process the remaining bytes in the buffer and put result from CTX
 118    in first 16 bytes following RESBUF.  The result is always in little
 119    endian byte order, so that a byte-wise output yields to the wanted
 120    ASCII representation of the message digest.
 121
 122    IMPORTANT: On some systems it is required that RESBUF be correctly
 123    aligned for a 32 bits value.  */
 124 extern void *md5_finish_ctx __P ((struct md5_ctx *ctx, void *resbuf));
 125
 126
 127 /* Put result from CTX in first 16 bytes following RESBUF.  The result is
 128    always in little endian byte order, so that a byte-wise output yields
 129    to the wanted ASCII representation of the message digest.
 130
 131    IMPORTANT: On some systems it is required that RESBUF is correctly
 132    aligned for a 32 bits value.  */
 133 extern void *md5_read_ctx __P ((const struct md5_ctx *ctx, void *resbuf));
 134
 135
 136 /* Compute MD5 message digest for bytes read from STREAM.  The
 137    resulting message digest number will be written into the 16 bytes
 138    beginning at RESBLOCK.  */
 139 extern int md5_stream __P ((FILE *stream, void *resblock));
 140
 141 /* Compute MD5 message digest for LEN bytes beginning at BUFFER.  The
 142    result is always in little endian byte order, so that a byte-wise
 143    output yields to the wanted ASCII representation of the message
 144    digest.  */
 145 extern void *md5_buffer __P ((const char *buffer, size_t len, void *resblock));
 146
 147 /* The following is from gnupg-1.0.2's cipher/bithelp.h.  */
 148 /* Rotate a 32 bit integer by n bytes */
 149 #if defined __GNUC__ && defined __i386__
 150 static inline md5_uint32
 151 rol(md5_uint32 x, int n)
 152 {
 153   __asm__("roll %%cl,%0"
 154           :"=r" (x)
 155           :"0" (x),"c" (n));
 156   return x;
 157 }
 158 #else
 159 # define rol(x,n) ( ((x) << (n)) | ((x) >> (32-(n))) )
 160 #endif
 161
 162 #endif