| 1 | /* Declaration of functions and data types used for MD5 sum computing |
| 2 | library functions. |
| 3 | Copyright (C) 1995, 1996, 1997, 1999, 2000, 2001, 2002, 2003, 2004, |
| 4 | 2005, 2006, 2007 Free Software Foundation, Inc. |
| 5 | This file is part of GNU Emacs. |
| 6 | |
| 7 | The GNU C Library is free software; you can redistribute it and/or |
| 8 | modify it under the terms of the GNU General Public License as |
| 9 | published by the Free Software Foundation; either version 2 of the |
| 10 | License, or (at your option) any later version. |
| 11 | |
| 12 | The GNU C Library 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 GNU |
| 15 | General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public |
| 18 | License along with the GNU C Library; see the file COPYING. If not, |
| 19 | write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| 20 | Boston, MA 02110-1301, USA. */ |
| 21 | |
| 22 | #ifndef _MD5_H |
| 23 | #define _MD5_H 1 |
| 24 | |
| 25 | #include <stdio.h> |
| 26 | |
| 27 | #if defined HAVE_LIMITS_H || _LIBC |
| 28 | # include <limits.h> |
| 29 | #endif |
| 30 | |
| 31 | /* The following contortions are an attempt to use the C preprocessor |
| 32 | to determine an unsigned integral type that is 32 bits wide. An |
| 33 | alternative approach is to use autoconf's AC_CHECK_SIZEOF macro, but |
| 34 | doing that would require that the configure script compile and *run* |
| 35 | the resulting executable. Locally running cross-compiled executables |
| 36 | is usually not possible. */ |
| 37 | |
| 38 | #ifdef _LIBC |
| 39 | # include <sys/types.h> |
| 40 | typedef u_int32_t md5_uint32; |
| 41 | #else |
| 42 | # if defined __STDC__ && __STDC__ |
| 43 | # define UINT_MAX_32_BITS 4294967295U |
| 44 | # else |
| 45 | # define UINT_MAX_32_BITS 0xFFFFFFFF |
| 46 | # endif |
| 47 | |
| 48 | /* If UINT_MAX isn't defined, assume it's a 32-bit type. |
| 49 | This should be valid for all systems GNU cares about because |
| 50 | that doesn't include 16-bit systems, and only modern systems |
| 51 | (that certainly have <limits.h>) have 64+-bit integral types. */ |
| 52 | |
| 53 | # ifndef UINT_MAX |
| 54 | # define UINT_MAX UINT_MAX_32_BITS |
| 55 | # endif |
| 56 | |
| 57 | # if UINT_MAX == UINT_MAX_32_BITS |
| 58 | typedef unsigned int md5_uint32; |
| 59 | # else |
| 60 | # if USHRT_MAX == UINT_MAX_32_BITS |
| 61 | typedef unsigned short md5_uint32; |
| 62 | # else |
| 63 | # if ULONG_MAX == UINT_MAX_32_BITS |
| 64 | typedef unsigned long md5_uint32; |
| 65 | # else |
| 66 | /* The following line is intended to evoke an error. |
| 67 | Using #error is not portable enough. */ |
| 68 | "Cannot determine unsigned 32-bit data type." |
| 69 | # endif |
| 70 | # endif |
| 71 | # endif |
| 72 | #endif |
| 73 | |
| 74 | |
| 75 | #ifndef __GNUC__ |
| 76 | #define __attribute__(X) |
| 77 | #define __alignof__(X) 1 |
| 78 | #endif |
| 79 | |
| 80 | /* Structure to save state of computation between the single steps. */ |
| 81 | struct md5_ctx |
| 82 | { |
| 83 | md5_uint32 A; |
| 84 | md5_uint32 B; |
| 85 | md5_uint32 C; |
| 86 | md5_uint32 D; |
| 87 | |
| 88 | md5_uint32 total[2]; |
| 89 | md5_uint32 buflen; |
| 90 | char buffer[128] __attribute__ ((__aligned__ (__alignof__ (md5_uint32)))); |
| 91 | }; |
| 92 | |
| 93 | /* |
| 94 | * The following three functions are build up the low level used in |
| 95 | * the functions `md5_stream' and `md5_buffer'. |
| 96 | */ |
| 97 | |
| 98 | /* Initialize structure containing state of computation. |
| 99 | (RFC 1321, 3.3: Step 3) */ |
| 100 | extern void md5_init_ctx __P ((struct md5_ctx *ctx)); |
| 101 | |
| 102 | /* Starting with the result of former calls of this function (or the |
| 103 | initialization function update the context for the next LEN bytes |
| 104 | starting at BUFFER. |
| 105 | It is necessary that LEN is a multiple of 64!!! */ |
| 106 | extern void md5_process_block __P ((const void *buffer, size_t len, |
| 107 | struct md5_ctx *ctx)); |
| 108 | |
| 109 | /* Starting with the result of former calls of this function (or the |
| 110 | initialization function update the context for the next LEN bytes |
| 111 | starting at BUFFER. |
| 112 | It is NOT required that LEN is a multiple of 64. */ |
| 113 | extern void md5_process_bytes __P ((const void *buffer, size_t len, |
| 114 | struct md5_ctx *ctx)); |
| 115 | |
| 116 | /* Process the remaining bytes in the buffer and put result from CTX |
| 117 | in first 16 bytes following RESBUF. The result is always in little |
| 118 | endian byte order, so that a byte-wise output yields to the wanted |
| 119 | ASCII representation of the message digest. |
| 120 | |
| 121 | IMPORTANT: On some systems it is required that RESBUF is correctly |
| 122 | aligned for a 32 bits value. */ |
| 123 | extern void *md5_finish_ctx __P ((struct md5_ctx *ctx, void *resbuf)); |
| 124 | |
| 125 | |
| 126 | /* Put result from CTX in first 16 bytes following RESBUF. The result is |
| 127 | always in little endian byte order, so that a byte-wise output yields |
| 128 | to the wanted ASCII representation of the message digest. |
| 129 | |
| 130 | IMPORTANT: On some systems it is required that RESBUF is correctly |
| 131 | aligned for a 32 bits value. */ |
| 132 | extern void *md5_read_ctx __P ((const struct md5_ctx *ctx, void *resbuf)); |
| 133 | |
| 134 | |
| 135 | /* Compute MD5 message digest for bytes read from STREAM. The |
| 136 | resulting message digest number will be written into the 16 bytes |
| 137 | beginning at RESBLOCK. */ |
| 138 | extern int md5_stream __P ((FILE *stream, void *resblock)); |
| 139 | |
| 140 | /* Compute MD5 message digest for LEN bytes beginning at BUFFER. The |
| 141 | result is always in little endian byte order, so that a byte-wise |
| 142 | output yields to the wanted ASCII representation of the message |
| 143 | digest. */ |
| 144 | extern void *md5_buffer __P ((const char *buffer, size_t len, |
| 145 | void *resblock)); |
| 146 | |
| 147 | #endif /* md5.h */ |
| 148 | |
| 149 | /* arch-tag: 7cd389f3-6c40-4950-999d-0b2ebd1d20d7 |
| 150 | (do not change this comment) */ |