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 Lesser General Public License as published by the
9 Free Software Foundation; either version 2.1, 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 Lesser General Public License for more details.
16
17 You should have received a copy of the GNU Lesser 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
57extern "C" {
58# endif
59
60/* Structure to save state of computation between the single steps. */
61struct 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) */
80extern 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!!! */
86extern 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. */
93extern 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. */
100extern 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. */
106extern 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. */
112extern 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. */
118extern 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 */
126