| 1 | /* md5.h - Declaration of functions and data types used for MD5 sum |
| 2 | computing library functions. |
| 3 | Copyright 1995, 1996, 2000 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 | #include <stdio.h> |
| 25 | |
| 26 | #if defined HAVE_LIMITS_H || _LIBC |
| 27 | # include <limits.h> |
| 28 | #endif |
| 29 | |
| 30 | /* The following contortions are an attempt to use the C preprocessor |
| 31 | to determine an unsigned integral type that is 32 bits wide. An |
| 32 | alternative approach is to use autoconf's AC_CHECK_SIZEOF macro, but |
| 33 | doing that would require that the configure script compile and *run* |
| 34 | the resulting executable. Locally running cross-compiled executables |
| 35 | is usually not possible. */ |
| 36 | |
| 37 | #ifdef _LIBC |
| 38 | # include <sys/types.h> |
| 39 | typedef u_int32_t md5_uint32; |
| 40 | #else |
| 41 | # define INT_MAX_32_BITS 2147483647 |
| 42 | |
| 43 | /* If UINT_MAX isn't defined, assume it's a 32-bit type. |
| 44 | This should be valid for all systems GNU cares about because |
| 45 | that doesn't include 16-bit systems, and only modern systems |
| 46 | (that certainly have <limits.h>) have 64+-bit integral types. */ |
| 47 | |
| 48 | # ifndef INT_MAX |
| 49 | # define INT_MAX INT_MAX_32_BITS |
| 50 | # endif |
| 51 | |
| 52 | # if INT_MAX == INT_MAX_32_BITS |
| 53 | typedef unsigned int md5_uint32; |
| 54 | # else |
| 55 | # if SHRT_MAX == INT_MAX_32_BITS |
| 56 | typedef unsigned short md5_uint32; |
| 57 | # else |
| 58 | # if LONG_MAX == INT_MAX_32_BITS |
| 59 | typedef unsigned long md5_uint32; |
| 60 | # else |
| 61 | /* The following line is intended to evoke an error. |
| 62 | Using #error is not portable enough. */ |
| 63 | "Cannot determine unsigned 32-bit data type." |
| 64 | # endif |
| 65 | # endif |
| 66 | # endif |
| 67 | #endif |
| 68 | |
| 69 | #undef __P |
| 70 | #if defined (__STDC__) && __STDC__ |
| 71 | #define __P(x) x |
| 72 | #else |
| 73 | #define __P(x) () |
| 74 | #endif |
| 75 | |
| 76 | /* Structure to save state of computation between the single steps. */ |
| 77 | struct md5_ctx |
| 78 | { |
| 79 | md5_uint32 A; |
| 80 | md5_uint32 B; |
| 81 | md5_uint32 C; |
| 82 | md5_uint32 D; |
| 83 | |
| 84 | md5_uint32 total[2]; |
| 85 | md5_uint32 buflen; |
| 86 | char buffer[128]; |
| 87 | }; |
| 88 | |
| 89 | /* |
| 90 | * The following three functions are build up the low level used in |
| 91 | * the functions `md5_stream' and `md5_buffer'. |
| 92 | */ |
| 93 | |
| 94 | /* Initialize structure containing state of computation. |
| 95 | (RFC 1321, 3.3: Step 3) */ |
| 96 | extern void md5_init_ctx __P ((struct md5_ctx *ctx)); |
| 97 | |
| 98 | /* Starting with the result of former calls of this function (or the |
| 99 | initialization function update the context for the next LEN bytes |
| 100 | starting at BUFFER. |
| 101 | It is necessary that LEN is a multiple of 64!!! */ |
| 102 | extern void md5_process_block __P ((const void *buffer, size_t len, |
| 103 | struct md5_ctx *ctx)); |
| 104 | |
| 105 | /* Starting with the result of former calls of this function (or the |
| 106 | initialization function update the context for the next LEN bytes |
| 107 | starting at BUFFER. |
| 108 | It is NOT required that LEN is a multiple of 64. */ |
| 109 | extern void md5_process_bytes __P ((const void *buffer, size_t len, |
| 110 | struct md5_ctx *ctx)); |
| 111 | |
| 112 | /* Process the remaining bytes in the buffer and put result from CTX |
| 113 | in first 16 bytes following RESBUF. The result is always in little |
| 114 | endian byte order, so that a byte-wise output yields to the wanted |
| 115 | ASCII representation of the message digest. |
| 116 | |
| 117 | IMPORTANT: On some systems it is required that RESBUF is correctly |
| 118 | aligned for a 32 bits value. */ |
| 119 | extern void *md5_finish_ctx __P ((struct md5_ctx *ctx, void *resbuf)); |
| 120 | |
| 121 | |
| 122 | /* Put result from CTX in first 16 bytes following RESBUF. The result is |
| 123 | always in little endian byte order, so that a byte-wise output yields |
| 124 | to the wanted ASCII representation of the message digest. |
| 125 | |
| 126 | IMPORTANT: On some systems it is required that RESBUF is correctly |
| 127 | aligned for a 32 bits value. */ |
| 128 | extern void *md5_read_ctx __P ((const struct md5_ctx *ctx, void *resbuf)); |
| 129 | |
| 130 | |
| 131 | /* Compute MD5 message digest for bytes read from STREAM. The |
| 132 | resulting message digest number will be written into the 16 bytes |
| 133 | beginning at RESBLOCK. */ |
| 134 | extern int md5_stream __P ((FILE *stream, void *resblock)); |
| 135 | |
| 136 | /* Compute MD5 message digest for LEN bytes beginning at BUFFER. The |
| 137 | result is always in little endian byte order, so that a byte-wise |
| 138 | output yields to the wanted ASCII representation of the message |
| 139 | digest. */ |
| 140 | extern void *md5_buffer __P ((const char *buffer, size_t len, void *resblock)); |
| 141 | |
| 142 | #endif |