1 /* md5.h - Declaration of functions and data types used for MD5 sum
2 computing library functions.
4 Copyright (C) 1995, 1996, 1999, 2000, 2003, 2004 Free Software
7 NOTE: The canonical source of this file is maintained with the GNU C
8 Library. Bugs can be reported to bug-glibc@prep.ai.mit.edu.
10 This program is free software; you can redistribute it and/or modify it
11 under the terms of the GNU General Public License as published by the
12 Free Software Foundation; either version 2, or (at your option) any
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software Foundation,
22 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
30 # include <inttypes.h>
32 #if HAVE_STDINT_H || _LIBC
36 typedef uint32_t md5_uint32;
38 /* Structure to save state of computation between the single steps. */
52 * The following three functions are build up the low level used in
53 * the functions `md5_stream' and `md5_buffer'.
56 /* Initialize structure containing state of computation.
57 (RFC 1321, 3.3: Step 3) */
58 extern void md5_init_ctx (struct md5_ctx *ctx);
60 /* Starting with the result of former calls of this function (or the
61 initialization function update the context for the next LEN bytes
63 It is necessary that LEN is a multiple of 64!!! */
64 extern void md5_process_block (const void *buffer, size_t len,
67 /* Starting with the result of former calls of this function (or the
68 initialization function update the context for the next LEN bytes
70 It is NOT required that LEN is a multiple of 64. */
71 extern void md5_process_bytes (const void *buffer, size_t len,
74 /* Process the remaining bytes in the buffer and put result from CTX
75 in first 16 bytes following RESBUF. The result is always in little
76 endian byte order, so that a byte-wise output yields to the wanted
77 ASCII representation of the message digest.
79 IMPORTANT: On some systems it is required that RESBUF be correctly
80 aligned for a 32 bits value. */
81 extern void *md5_finish_ctx (struct md5_ctx *ctx, void *resbuf);
84 /* Put result from CTX in first 16 bytes following RESBUF. The result is
85 always in little endian byte order, so that a byte-wise output yields
86 to the wanted ASCII representation of the message digest.
88 IMPORTANT: On some systems it is required that RESBUF is correctly
89 aligned for a 32 bits value. */
90 extern void *md5_read_ctx (const struct md5_ctx *ctx, void *resbuf);
93 /* Compute MD5 message digest for bytes read from STREAM. The
94 resulting message digest number will be written into the 16 bytes
95 beginning at RESBLOCK. */
96 extern int md5_stream (FILE *stream, void *resblock);
98 /* Compute MD5 message digest for LEN bytes beginning at BUFFER. The
99 result is always in little endian byte order, so that a byte-wise
100 output yields to the wanted ASCII representation of the message
102 extern void *md5_buffer (const char *buffer, size_t len, void *resblock);
104 #define rol(x,n) ( ((x) << (n)) | ((x) >> (32-(n))) )