1/* md5.h - Declaration of functions and data types used for MD5 sum 2 computing library functions. 3 Copyright (C) 1995 Free Software Foundation, Inc. 4 5This program is free software; you can redistribute it and/or modify 6it under the terms of the GNU General Public License as published by 7the Free Software Foundation; either version 2, or (at your option) 8any later version. 9 10This program is distributed in the hope that it will be useful, 11but WITHOUT ANY WARRANTY; without even the implied warranty of 12MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13GNU General Public License for more details. 14 15You should have received a copy of the GNU General Public License 16along with this program; if not, write to the Free Software 17Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ 18 19#ifndef _MD5_H 20#define _MD5_H 21 22#include <stdio.h> 23 24#if defined HAVE_LIMITS_H || _LIBC 25# include <limits.h> 26#endif 27 28/* The following contortions are an attempt to use the C preprocessor 29 to determine an unsigned integral type that is 32 bits wide. An 30 alternative approach is to use autoconf's AC_CHECK_SIZEOF macro, but 31 doing that would require that the configure script compile and *run* 32 the resulting executable. Locally running cross-compiled executables 33 is usually not possible. */ 34 35#if defined __STDC__ && __STDC__ 36# define UINT_MAX_32_BITS 4294967295U 37#else 38# define UINT_MAX_32_BITS 0xFFFFFFFF 39#endif 40 41/* If UINT_MAX isn't defined, assume it's a 32-bit type. 42 This should be valid for all systems GNU cares about because 43 that doesn't include 16-bit systems, and only modern systems 44 (that certainly have <limits.h>) have 64+-bit integral types. */ 45 46#ifndef UINT_MAX 47# define UINT_MAX UINT_MAX_32_BITS 48#endif 49 50#if UINT_MAX == UINT_MAX_32_BITS 51 typedef unsigned int md5_uint32; 52#else 53# if USHRT_MAX == UINT_MAX_32_BITS 54 typedef unsigned short md5_uint32; 55# else 56# if ULONG_MAX == UINT_MAX_32_BITS 57 typedef unsigned long md5_uint32; 58# else 59 /* The following line is intended to evoke an error. 60 Using #error is not portable enough. */ 61 "Cannot determine unsigned 32-bit data type." 62# endif 63# endif 64#endif 65 66#undef __P 67#if defined (__STDC__) && __STDC__ 68#define __P(x) x 69#else 70#define __P(x) () 71#endif 72 73/* Structure to save state of computation between the single steps. */ 74struct md5_ctx 75{ 76 md5_uint32 A; 77 md5_uint32 B; 78 md5_uint32 C; 79 md5_uint32 D; 80}; 81 82/* 83 * The following three functions are build up the low level used in 84 * the functions `md5_stream' and `md5_buffer'. 85 */ 86 87/* Initialize structure containing state of computation. 88 (RFC 1321, 3.3: Step 3) */ 89void md5_init_ctx __P ((struct md5_ctx *ctx)); 90 91/* Starting with the result of former calls of this function (or the 92 initialzation function update the context for the next LEN bytes 93 starting at BUFFER. 94 It is necessary that LEN is a multiple of 64!!! */ 95void md5_process_block __P ((const void *buffer, size_t len, 96 struct md5_ctx *ctx)); 97 98/* Put result from CTX in first 16 bytes following RESBUF. The result is 99 always in little endian byte order, so that a byte-wise output yields 100 to the wanted ASCII representation of the message digest. */ 101void *md5_read_ctx __P ((const struct md5_ctx *ctx, void *resbuf)); 102 103 104/* Compute MD5 message digest for bytes read from STREAM. The 105 resulting message digest number will be written into the 16 bytes 106 beginning at RESBLOCK. */ 107int md5_stream __P ((FILE *stream, void *resblock)); 108 109/* Compute MD5 message digest for LEN bytes beginning at BUFFER. The 110 result is always in little endian byte order, so that a byte-wise 111 output yields to the wanted ASCII representation of the message 112 digest. */ 113void *md5_buffer __P ((const char *buffer, size_t len, void *resblock)); 114 115#endif 116