1/* md5.h - Declaration of functions and data types used for MD5 sum 2 computing library functions. 3 Copyright (C) 1995, 1996 Free Software Foundation, Inc. 4 NOTE: The canonical source of this file is maintained with the GNU C 5 Library. Bugs can be reported to bug-glibc@prep.ai.mit.edu. 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 2, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ 20 21#ifndef _MD5_H 22#define _MD5_H 1 23 24#ifdef HAVE_CONFIG_H 25# include <config.h> 26#endif 27 28#ifdef USE_MD5 29 30#define PARAMS(args) args 31 32#include <stdio.h> 33 34#if defined HAVE_LIMITS_H || _LIBC 35# include <limits.h> 36#endif 37 38/* The following contortions are an attempt to use the C preprocessor 39 to determine an unsigned integral type that is 32 bits wide. An 40 alternative approach is to use autoconf's AC_CHECK_SIZEOF macro, but 41 doing that would require that the configure script compile and *run* 42 the resulting executable. Locally running cross-compiled executables 43 is usually not possible. */ 44 45#ifdef _LIBC 46# include <sys/types.h> 47typedef u_int32_t md5_uint32; 48#else 49# if defined __STDC__ && __STDC__ 50# define UINT_MAX_32_BITS 4294967295U 51# else 52# define UINT_MAX_32_BITS 0xFFFFFFFF 53# endif 54 55/* If UINT_MAX isn't defined, assume it's a 32-bit type. 56 This should be valid for all systems GNU cares about because 57 that doesn't include 16-bit systems, and only modern systems 58 (that certainly have <limits.h>) have 64+-bit integral types. */ 59 60# ifndef UINT_MAX 61# define UINT_MAX UINT_MAX_32_BITS 62# endif 63 64# if UINT_MAX == UINT_MAX_32_BITS 65 typedef unsigned int md5_uint32; 66# else 67# if USHRT_MAX == UINT_MAX_32_BITS 68 typedef unsigned short md5_uint32; 69# else 70# if ULONG_MAX == UINT_MAX_32_BITS 71 typedef unsigned long md5_uint32; 72# else 73 /* The following line is intended to evoke an error. 74 Using #error is not portable enough. */ 75 "Cannot determine unsigned 32-bit data type." 76# endif 77# endif 78# endif 79#endif 80 81/* Structure to save state of computation between the single steps. */ 82struct md5_ctx 83{ 84 md5_uint32 A; 85 md5_uint32 B; 86 md5_uint32 C; 87 md5_uint32 D; 88 89 md5_uint32 total[2]; 90 md5_uint32 buflen; 91 char buffer[128]; 92}; 93 94/* 95 * The following three functions are build up the low level used in 96 * the functions `md5_stream' and `md5_buffer'. 97 */ 98 99/* Initialize structure containing state of computation. 100 (RFC 1321, 3.3: Step 3) */ 101extern void md5_init_ctx PARAMS ((struct md5_ctx *ctx)); 102 103/* Starting with the result of former calls of this function (or the 104 initialization function update the context for the next LEN bytes 105 starting at BUFFER. 106 It is necessary that LEN is a multiple of 64!!! */ 107extern void md5_process_block PARAMS ((const void *buffer, size_t len, 108 struct md5_ctx *ctx)); 109 110/* Starting with the result of former calls of this function (or the 111 initialization function update the context for the next LEN bytes 112 starting at BUFFER. 113 It is NOT required that LEN is a multiple of 64. */ 114extern void md5_process_bytes PARAMS ((const void *buffer, size_t len, 115 struct md5_ctx *ctx)); 116 117/* Process the remaining bytes in the buffer and put result from CTX 118 in first 16 bytes following RESBUF. The result is always in little 119 endian byte order, so that a byte-wise output yields to the wanted 120 ASCII representation of the message digest. 121 122 IMPORTANT: On some systems it is required that RESBUF is correctly 123 aligned for a 32 bits value. */ 124extern void *md5_finish_ctx PARAMS ((struct md5_ctx *ctx, void *resbuf)); 125 126 127/* Put result from CTX in first 16 bytes following RESBUF. The result is 128 always in little endian byte order, so that a byte-wise output yields 129 to the wanted ASCII representation of the message digest. 130 131 IMPORTANT: On some systems it is required that RESBUF is correctly 132 aligned for a 32 bits value. */ 133extern void *md5_read_ctx PARAMS ((const struct md5_ctx *ctx, void *resbuf)); 134 135 136/* Compute MD5 message digest for bytes read from STREAM. The 137 resulting message digest number will be written into the 16 bytes 138 beginning at RESBLOCK. */ 139extern int md5_stream PARAMS ((FILE *stream, void *resblock)); 140 141/* Compute MD5 message digest for LEN bytes beginning at BUFFER. The 142 result is always in little endian byte order, so that a byte-wise 143 output yields to the wanted ASCII representation of the message 144 digest. */ 145extern void *md5_buffer PARAMS ((const char *buffer, size_t len, 146 void *resblock)); 147 148#endif 149#endif 150