lib/md5.h

   1 /* Declaration of functions and data types used for MD5 sum computing
   2    library functions.
   3    Copyright (C) 1995-1997, 1999-2001, 2004-2006, 2008-2012 Free Software
   4    Foundation, Inc.
   5    This file is part of the GNU C Library.
   6
   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.
  11
  12    This program 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
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef _MD5_H
  21 #define _MD5_H 1
  22
  23 #include <stdio.h>
  24 #include <stdint.h>
  25
  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
  54 #endif
  55
  56 # ifdef __cplusplus
  57 extern "C" {
  58 # endif
  59
  60 /* Structure to save state of computation between the single steps.  */
  61 struct md5_ctx
  62 {
  63   uint32_t A;
  64   uint32_t B;
  65   uint32_t C;
  66   uint32_t D;
  67
  68   uint32_t total[2];
  69   uint32_t buflen;
  70   uint32_t buffer[32];
  71 };
  72
  73 /*
  74  * The following three functions are build up the low level used in
  75  * the functions 'md5_stream' and 'md5_buffer'.
  76  */
  77
  78 /* Initialize structure containing state of computation.
  79    (RFC 1321, 3.3: Step 3)  */
  80 extern void __md5_init_ctx (struct md5_ctx *ctx) __THROW;
  81
  82 /* Starting with the result of former calls of this function (or the
  83    initialization function update the context for the next LEN bytes
  84    starting at BUFFER.
  85    It is necessary that LEN is a multiple of 64!!! */
  86 extern void __md5_process_block (const void *buffer, size_t len,
  87                                  struct md5_ctx *ctx) __THROW;
  88
  89 /* Starting with the result of former calls of this function (or the
  90    initialization function update the context for the next LEN bytes
  91    starting at BUFFER.
  92    It is NOT required that LEN is a multiple of 64.  */
  93 extern void __md5_process_bytes (const void *buffer, size_t len,
  94                                  struct md5_ctx *ctx) __THROW;
  95
  96 /* Process the remaining bytes in the buffer and put result from CTX
  97    in first 16 bytes following RESBUF.  The result is always in little
  98    endian byte order, so that a byte-wise output yields to the wanted
  99    ASCII representation of the message digest.  */
 100 extern void *__md5_finish_ctx (struct md5_ctx *ctx, void *resbuf) __THROW;
 101
 102
 103 /* Put result from CTX in first 16 bytes following RESBUF.  The result is
 104    always in little endian byte order, so that a byte-wise output yields
 105    to the wanted ASCII representation of the message digest.  */
 106 extern void *__md5_read_ctx (const struct md5_ctx *ctx, void *resbuf) __THROW;
 107
 108
 109 /* Compute MD5 message digest for bytes read from STREAM.  The
 110    resulting message digest number will be written into the 16 bytes
 111    beginning at RESBLOCK.  */
 112 extern int __md5_stream (FILE *stream, void *resblock) __THROW;
 113
 114 /* Compute MD5 message digest for LEN bytes beginning at BUFFER.  The
 115    result is always in little endian byte order, so that a byte-wise
 116    output yields to the wanted ASCII representation of the message
 117    digest.  */
 118 extern void *__md5_buffer (const char *buffer, size_t len,
 119                            void *resblock) __THROW;
 120
 121 # ifdef __cplusplus
 122 }
 123 # endif
 124
 125 #endif /* md5.h */