Decrypt/Decrypt/md5.h

   1 /* Declaration of functions and data types used for MD5 sum computing
   2 library functions.
   3 Copyright (C) 1995-1997,1999,2000,2001,2004,2005,2011,2012
   4 Free Software Foundation, Inc.
   5 This file is part of the GNU C Library.
   6
   7 The GNU C Library is free software; you can redistribute it and/or
   8 modify it under the terms of the GNU Lesser General Public
   9 License as published by the Free Software Foundation; either
  10 version 2.1 of the License, or (at your option) any later version.
  11
  12 The GNU C Library is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15 Lesser General Public License for more details.
  16
  17 You should have received a copy of the GNU Lesser General Public
  18 License along with the GNU C Library; if not, see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef _MD5_H
  22 #define _MD5_H 1
  23
  24 #include <stdio.h>
  25
  26
  27 #define MD5_DIGEST_SIZE 16
  28 #define MD5_BLOCK_SIZE 64
  29
  30 /* The following contortions are an attempt to use the C preprocessor
  31 to determine an unsigned integral type that is 32 bits wide.  An
  32 alternative approach is to use autoconf's AC_CHECK_SIZEOF macro, but
  33 doing that would require that the configure script compile and *run*
  34 the resulting executable.  Locally running cross-compiled executables
  35 is usually not possible.  */
  36
  37 #ifdef _LIBC
  38 # include <stdint.h>
  39 typedef uint32_t md5_uint32;
  40 typedef uintptr_t md5_uintptr;
  41 #else
  42 # define UINT_MAX_32_BITS 4294967295U
  43
  44 /* If UINT_MAX isn't defined, assume it's a 32-bit type.
  45 This should be valid for all systems GNU cares about because
  46 that doesn't include 16-bit systems, and only modern systems
  47 (that certainly have <limits.h>) have 64+-bit integral types.  */
  48
  49 # ifndef UINT_MAX
  50 #  define UINT_MAX UINT_MAX_32_BITS
  51 # endif
  52
  53 # if UINT_MAX == UINT_MAX_32_BITS
  54 typedef unsigned int md5_uint32;
  55 # else
  56 #  if USHRT_MAX == UINT_MAX_32_BITS
  57 typedef unsigned short md5_uint32;
  58 #  else
  59 #   if ULONG_MAX == UINT_MAX_32_BITS
  60 typedef unsigned long md5_uint32;
  61 #   else
  62 /* The following line is intended to evoke an error.
  63 Using #error is not portable enough.  */
  64 "Cannot determine unsigned 32-bit data type."
  65 #   endif
  66 #  endif
  67 # endif
  68         /* We have to make a guess about the integer type equivalent in size
  69         to pointers which should always be correct.  */
  70         typedef unsigned long int md5_uintptr;
  71 #endif
  72
  73 /* Structure to save state of computation between the single steps.  */
  74 struct md5_ctx
  75 {
  76         md5_uint32 A;
  77         md5_uint32 B;
  78         md5_uint32 C;
  79         md5_uint32 D;
  80
  81         md5_uint32 total[2];
  82         md5_uint32 buflen;
  83         md5_uint32 tempbuf[128];
  84         union
  85         {
  86 #if MD5_LIB == LIB_CPU
  87                 char buffer[128];
  88 #endif
  89                 md5_uint32 buffer32[32];
  90         };
  91 };
  92
  93 /*
  94 * The following three functions are build up the low level used in
  95 * the functions `md5_stream' and `md5_buffer'.
  96 */
  97
  98 /* Initialize structure containing state of computation.
  99 (RFC 1321, 3.3: Step 3)  */
 100 MD5_EXPORT extern void md5_init_ctx (struct md5_ctx *ctx) MD5_FUNC_RESTRICT;
 101
 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 NOT required that LEN is a multiple of 64.  */
 107 MD5_EXPORT extern void md5_process_bytes (const void *buffer, size_t len, struct md5_ctx *ctx) MD5_FUNC_RESTRICT;
 108 MD5_EXPORT void md5_process_block (const void *buffer, size_t len, struct md5_ctx *ctx) MD5_FUNC_RESTRICT;
 109 /* Process the remaining bytes in the buffer and put result from CTX
 110 in first 16 bytes following RESBUF.  The result is always in little
 111 endian byte order, so that a byte-wise output yields to the wanted
 112 ASCII representation of the message digest.
 113
 114 IMPORTANT: On some systems it is required that RESBUF is correctly
 115 aligned for a 32 bits value.  */
 116 MD5_EXPORT extern void *md5_finish_ctx (struct md5_ctx *ctx, void *resbuf) MD5_FUNC_RESTRICT;
 117
 118
 119 /* Put result from CTX in first 16 bytes following RESBUF.  The result is
 120 always in little endian byte order, so that a byte-wise output yields
 121 to the wanted ASCII representation of the message digest.
 122
 123 IMPORTANT: On some systems it is required that RESBUF is correctly
 124 aligned for a 32 bits value.  */
 125 MD5_EXPORT extern void *md5_read_ctx (const struct md5_ctx *ctx, void *resbuf) MD5_FUNC_RESTRICT;
 126
 127 #endif /* md5.h */