2016/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, 2008-2017 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 2, 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 # if HAVE_OPENSSL_MD5
  27 #  include <openssl/md5.h>
  28 # endif
  29
  30 #define MD5_DIGEST_SIZE 16
  31 #define MD5_BLOCK_SIZE 64
  32
  33 #ifndef __GNUC_PREREQ
  34 # if defined __GNUC__ && defined __GNUC_MINOR__
  35 #  define __GNUC_PREREQ(maj, min)                                       \
  36   ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
  37 # else
  38 #  define __GNUC_PREREQ(maj, min) 0
  39 # endif
  40 #endif
  41
  42 #ifndef __THROW
  43 # if defined __cplusplus && __GNUC_PREREQ (2,8)
  44 #  define __THROW       throw ()
  45 # else
  46 #  define __THROW
  47 # endif
  48 #endif
  49
  50 #ifndef _LIBC
  51 # define __md5_buffer md5_buffer
  52 # define __md5_finish_ctx md5_finish_ctx
  53 # define __md5_init_ctx md5_init_ctx
  54 # define __md5_process_block md5_process_block
  55 # define __md5_process_bytes md5_process_bytes
  56 # define __md5_read_ctx md5_read_ctx
  57 # define __md5_stream md5_stream
  58 #endif
  59
  60 # ifdef __cplusplus
  61 extern "C" {
  62 # endif
  63
  64 # if HAVE_OPENSSL_MD5
  65 #  define GL_OPENSSL_NAME 5
  66 #  include "gl_openssl.h"
  67 # else
  68 /* Structure to save state of computation between the single steps.  */
  69 struct md5_ctx
  70 {
  71   uint32_t A;
  72   uint32_t B;
  73   uint32_t C;
  74   uint32_t D;
  75
  76   uint32_t total[2];
  77   uint32_t buflen;     /* ≥ 0, ≤ 128 */
  78   uint32_t buffer[32]; /* 128 bytes; the first buflen bytes are in use */
  79 };
  80
  81 /*
  82  * The following three functions are build up the low level used in
  83  * the functions 'md5_stream' and 'md5_buffer'.
  84  */
  85
  86 /* Initialize structure containing state of computation.
  87    (RFC 1321, 3.3: Step 3)  */
  88 extern void __md5_init_ctx (struct md5_ctx *ctx) __THROW;
  89
  90 /* Starting with the result of former calls of this function (or the
  91    initialization function update the context for the next LEN bytes
  92    starting at BUFFER.
  93    It is necessary that LEN is a multiple of 64!!! */
  94 extern void __md5_process_block (const void *buffer, size_t len,
  95                                  struct md5_ctx *ctx) __THROW;
  96
  97 /* Starting with the result of former calls of this function (or the
  98    initialization function update the context for the next LEN bytes
  99    starting at BUFFER.
 100    It is NOT required that LEN is a multiple of 64.  */
 101 extern void __md5_process_bytes (const void *buffer, size_t len,
 102                                  struct md5_ctx *ctx) __THROW;
 103
 104 /* Process the remaining bytes in the buffer and put result from CTX
 105    in first 16 bytes following RESBUF.  The result is always in little
 106    endian byte order, so that a byte-wise output yields to the wanted
 107    ASCII representation of the message digest.  */
 108 extern void *__md5_finish_ctx (struct md5_ctx *ctx, void *resbuf) __THROW;
 109
 110
 111 /* Put result from CTX in first 16 bytes following RESBUF.  The result is
 112    always in little endian byte order, so that a byte-wise output yields
 113    to the wanted ASCII representation of the message digest.  */
 114 extern void *__md5_read_ctx (const struct md5_ctx *ctx, void *resbuf) __THROW;
 115
 116
 117 /* Compute MD5 message digest for LEN bytes beginning at BUFFER.  The
 118    result is always in little endian byte order, so that a byte-wise
 119    output yields to the wanted ASCII representation of the message
 120    digest.  */
 121 extern void *__md5_buffer (const char *buffer, size_t len,
 122                            void *resblock) __THROW;
 123
 124 # endif
 125 /* Compute MD5 message digest for bytes read from STREAM.  The
 126    resulting message digest number will be written into the 16 bytes
 127    beginning at RESBLOCK.  */
 128 extern int __md5_stream (FILE *stream, void *resblock) __THROW;
 129
 130
 131 # ifdef __cplusplus
 132 }
 133 # endif
 134
 135 #endif /* md5.h */