1/* Declaration of functions and data types used for MD5 sum computing
2   library functions.
3   Copyright (C) 1995,1996,1997,1999-2001,2004,2005,2008 Red Hat, Inc.
4   This file is part of Red Hat elfutils.
5   Written by Ulrich Drepper <drepper@redhat.com>, 1995.
6
7   Red Hat elfutils is free software; you can redistribute it and/or modify
8   it under the terms of the GNU General Public License as published by the
9   Free Software Foundation; version 2 of the License.
10
11   Red Hat elfutils is distributed in the hope that it will be useful, but
12   WITHOUT ANY WARRANTY; without even the implied warranty of
13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14   General Public License for more details.
15
16   You should have received a copy of the GNU General Public License along
17   with Red Hat elfutils; if not, write to the Free Software Foundation,
18   Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.
19
20   Red Hat elfutils is an included package of the Open Invention Network.
21   An included package of the Open Invention Network is a package for which
22   Open Invention Network licensees cross-license their patents.  No patent
23   license is granted, either expressly or impliedly, by designation as an
24   included package.  Should you wish to participate in the Open Invention
25   Network licensing program, please visit www.openinventionnetwork.com
26   <http://www.openinventionnetwork.com>.  */
27
28#ifndef _MD5_H
29#define _MD5_H 1
30
31#include <limits.h>
32#include <stdint.h>
33#include <stdio.h>
34
35#define MD5_DIGEST_SIZE 16
36#define MD5_BLOCK_SIZE 64
37
38typedef uint32_t md5_uint32;
39typedef uintptr_t md5_uintptr;
40
41/* Structure to save state of computation between the single steps.  */
42struct md5_ctx
43{
44  md5_uint32 A;
45  md5_uint32 B;
46  md5_uint32 C;
47  md5_uint32 D;
48
49  md5_uint32 total[2];
50  md5_uint32 buflen;
51  char buffer[128] __attribute__ ((__aligned__ (__alignof__ (md5_uint32))));
52};
53
54/*
55 * The following three functions are build up the low level used in
56 * the functions `md5_stream' and `md5_buffer'.
57 */
58
59/* Initialize structure containing state of computation.
60   (RFC 1321, 3.3: Step 3)  */
61extern void md5_init_ctx (struct md5_ctx *ctx);
62
63/* Starting with the result of former calls of this function (or the
64   initialization function update the context for the next LEN bytes
65   starting at BUFFER.
66   It is necessary that LEN is a multiple of 64!!! */
67extern void md5_process_block (const void *buffer, size_t len,
68			       struct md5_ctx *ctx);
69
70/* Starting with the result of former calls of this function (or the
71   initialization function update the context for the next LEN bytes
72   starting at BUFFER.
73   It is NOT required that LEN is a multiple of 64.  */
74extern void md5_process_bytes (const void *buffer, size_t len,
75			       struct md5_ctx *ctx);
76
77/* Process the remaining bytes in the buffer and put result from CTX
78   in first 16 bytes following RESBUF.  The result is always in little
79   endian byte order, so that a byte-wise output yields to the wanted
80   ASCII representation of the message digest.
81
82   IMPORTANT: On some systems it is required that RESBUF is correctly
83   aligned for a 32 bits value.  */
84extern void *md5_finish_ctx (struct md5_ctx *ctx, void *resbuf);
85
86
87/* Put result from CTX in first 16 bytes following RESBUF.  The result is
88   always in little endian byte order, so that a byte-wise output yields
89   to the wanted ASCII representation of the message digest.
90
91   IMPORTANT: On some systems it is required that RESBUF is correctly
92   aligned for a 32 bits value.  */
93extern void *md5_read_ctx (const struct md5_ctx *ctx, void *resbuf);
94
95
96/* Compute MD5 message digest for bytes read from STREAM.  The
97   resulting message digest number will be written into the 16 bytes
98   beginning at RESBLOCK.  */
99extern int md5_stream (FILE *stream, void *resblock);
100
101/* Compute MD5 message digest for LEN bytes beginning at BUFFER.  The
102   result is always in little endian byte order, so that a byte-wise
103   output yields to the wanted ASCII representation of the message
104   digest.  */
105extern void *md5_buffer (const char *buffer, size_t len, void *resblock);
106
107#endif /* md5.h */
108