1/* Declaration of functions and data types used for MD5 sum computing
2   library functions.
3   Copyright (C) 1995-1997,1999,2000,2001,2004,2005,2006,2008,2009
4      Free Software 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, write to the Free Software Foundation,
19   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
20
21#ifndef _MD5_H
22#define _MD5_H 1
23
24#include <stdio.h>
25#include <stdint.h>
26
27#define MD5_DIGEST_SIZE 16
28#define MD5_BLOCK_SIZE 64
29
30#ifndef __GNUC_PREREQ
31# if defined __GNUC__ && defined __GNUC_MINOR__
32#  define __GNUC_PREREQ(maj, min)					\
33  ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
34# else
35#  define __GNUC_PREREQ(maj, min) 0
36# endif
37#endif
38
39#ifndef __THROW
40# if defined __cplusplus && __GNUC_PREREQ (2,8)
41#  define __THROW	throw ()
42# else
43#  define __THROW
44# endif
45#endif
46
47#ifndef _LIBC
48# define __md5_buffer md5_buffer
49# define __md5_finish_ctx md5_finish_ctx
50# define __md5_init_ctx md5_init_ctx
51# define __md5_process_block md5_process_block
52# define __md5_process_bytes md5_process_bytes
53# define __md5_read_ctx md5_read_ctx
54# define __md5_stream md5_stream
55#endif
56
57# ifdef __cplusplus
58extern "C" {
59# endif
60
61/* Structure to save state of computation between the single steps.  */
62struct md5_ctx
63{
64  uint32_t A;
65  uint32_t B;
66  uint32_t C;
67  uint32_t D;
68
69  uint32_t total[2];
70  uint32_t buflen;
71  uint32_t buffer[32];
72};
73
74/*
75 * The following three functions are build up the low level used in
76 * the functions `md5_stream' and `md5_buffer'.
77 */
78
79/* Initialize structure containing state of computation.
80   (RFC 1321, 3.3: Step 3)  */
81extern void __md5_init_ctx (struct md5_ctx *ctx) __THROW;
82
83/* Starting with the result of former calls of this function (or the
84   initialization function update the context for the next LEN bytes
85   starting at BUFFER.
86   It is necessary that LEN is a multiple of 64!!! */
87extern void __md5_process_block (const void *buffer, size_t len,
88				 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 NOT required that LEN is a multiple of 64.  */
94extern void __md5_process_bytes (const void *buffer, size_t len,
95				 struct md5_ctx *ctx) __THROW;
96
97/* Process the remaining bytes in the buffer and put result from CTX
98   in first 16 bytes following RESBUF.  The result is always in little
99   endian byte order, so that a byte-wise output yields to the wanted
100   ASCII representation of the message digest.  */
101extern void *__md5_finish_ctx (struct md5_ctx *ctx, void *resbuf) __THROW;
102
103
104/* Put result from CTX in first 16 bytes following RESBUF.  The result is
105   always in little endian byte order, so that a byte-wise output yields
106   to the wanted ASCII representation of the message digest.  */
107extern void *__md5_read_ctx (const struct md5_ctx *ctx, void *resbuf) __THROW;
108
109
110/* Compute MD5 message digest for bytes read from STREAM.  The
111   resulting message digest number will be written into the 16 bytes
112   beginning at RESBLOCK.  */
113extern int __md5_stream (FILE *stream, void *resblock) __THROW;
114
115/* Compute MD5 message digest for LEN bytes beginning at BUFFER.  The
116   result is always in little endian byte order, so that a byte-wise
117   output yields to the wanted ASCII representation of the message
118   digest.  */
119extern void *__md5_buffer (const char *buffer, size_t len,
120			   void *resblock) __THROW;
121
122# ifdef __cplusplus
123}
124# endif
125
126#endif /* md5.h */
127