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152 lines
5.1 KiB
152 lines
5.1 KiB
/* Declaration of functions and data types used for MD5 sum computing |
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library functions. |
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Copyright (C) 1995-1997,1999,2000,2001,2004,2005 |
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Free Software Foundation, Inc. |
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This file is part of the GNU C Library. |
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The GNU C Library is free software; you can redistribute it and/or |
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modify it under the terms of the GNU Lesser General Public |
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License as published by the Free Software Foundation; either |
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version 2.1 of the License, or (at your option) any later version. |
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The GNU C Library is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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Lesser General Public License for more details. |
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You should have received a copy of the GNU Lesser General Public |
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License along with the GNU C Library; if not, write to the Free |
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
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02111-1307 USA. */ |
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#ifndef _MD5_H |
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#define _MD5_H 1 |
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#include <stdio.h> |
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#if defined HAVE_LIMITS_H || _LIBC |
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# include <limits.h> |
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#endif |
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#define MD5_DIGEST_SIZE 16 |
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#define MD5_BLOCK_SIZE 64 |
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/* The following contortions are an attempt to use the C preprocessor |
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to determine an unsigned integral type that is 32 bits wide. An |
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alternative approach is to use autoconf's AC_CHECK_SIZEOF macro, but |
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doing that would require that the configure script compile and *run* |
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the resulting executable. Locally running cross-compiled executables |
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is usually not possible. */ |
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#ifdef _LIBC |
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# include <stdint.h> |
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typedef uint32_t md5_uint32; |
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typedef uintptr_t md5_uintptr; |
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#else |
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# if defined __STDC__ && __STDC__ |
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# define UINT_MAX_32_BITS 4294967295U |
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# else |
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# define UINT_MAX_32_BITS 0xFFFFFFFF |
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# endif |
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/* If UINT_MAX isn't defined, assume it's a 32-bit type. |
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This should be valid for all systems GNU cares about because |
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that doesn't include 16-bit systems, and only modern systems |
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(that certainly have <limits.h>) have 64+-bit integral types. */ |
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# ifndef UINT_MAX |
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# define UINT_MAX UINT_MAX_32_BITS |
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# endif |
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# if UINT_MAX == UINT_MAX_32_BITS |
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typedef unsigned int md5_uint32; |
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# else |
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# if USHRT_MAX == UINT_MAX_32_BITS |
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typedef unsigned short md5_uint32; |
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# else |
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# if ULONG_MAX == UINT_MAX_32_BITS |
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typedef unsigned long md5_uint32; |
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# else |
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/* The following line is intended to evoke an error. |
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Using #error is not portable enough. */ |
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"Cannot determine unsigned 32-bit data type." |
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# endif |
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# endif |
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# endif |
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/* We have to make a guess about the integer type equivalent in size |
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to pointers which should always be correct. */ |
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typedef unsigned long int md5_uintptr; |
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#endif |
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/* Structure to save state of computation between the single steps. */ |
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struct md5_ctx |
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{ |
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md5_uint32 A; |
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md5_uint32 B; |
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md5_uint32 C; |
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md5_uint32 D; |
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md5_uint32 total[2]; |
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md5_uint32 buflen; |
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char buffer[128] |
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#if __GNUC__ |
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__attribute__ ((__aligned__ (__alignof__ (md5_uint32)))) |
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#endif |
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; |
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}; |
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/* |
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* The following three functions are build up the low level used in |
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* the functions `md5_stream' and `md5_buffer'. |
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*/ |
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/* Initialize structure containing state of computation. |
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(RFC 1321, 3.3: Step 3) */ |
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extern void __md5_init_ctx (struct md5_ctx *ctx); |
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/* Starting with the result of former calls of this function (or the |
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initialization function update the context for the next LEN bytes |
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starting at BUFFER. |
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It is necessary that LEN is a multiple of 64!!! */ |
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extern void __md5_process_block (const void *buffer, size_t len, |
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struct md5_ctx *ctx); |
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/* Starting with the result of former calls of this function (or the |
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initialization function update the context for the next LEN bytes |
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starting at BUFFER. |
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It is NOT required that LEN is a multiple of 64. */ |
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extern void __md5_process_bytes (const void *buffer, size_t len, |
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struct md5_ctx *ctx); |
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/* Process the remaining bytes in the buffer and put result from CTX |
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in first 16 bytes following RESBUF. The result is always in little |
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endian byte order, so that a byte-wise output yields to the wanted |
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ASCII representation of the message digest. |
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IMPORTANT: On some systems it is required that RESBUF is correctly |
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aligned for a 32 bits value. */ |
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extern void *__md5_finish_ctx (struct md5_ctx *ctx, void *resbuf); |
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/* Put result from CTX in first 16 bytes following RESBUF. The result is |
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always in little endian byte order, so that a byte-wise output yields |
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to the wanted ASCII representation of the message digest. |
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IMPORTANT: On some systems it is required that RESBUF is correctly |
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aligned for a 32 bits value. */ |
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extern void *__md5_read_ctx (const struct md5_ctx *ctx, void *resbuf); |
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/* Compute MD5 message digest for bytes read from STREAM. The |
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resulting message digest number will be written into the 16 bytes |
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beginning at RESBLOCK. */ |
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extern int __md5_stream (FILE *stream, void *resblock); |
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/* Compute MD5 message digest for LEN bytes beginning at BUFFER. The |
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result is always in little endian byte order, so that a byte-wise |
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output yields to the wanted ASCII representation of the message |
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digest. */ |
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extern void *__md5_buffer (const char *buffer, size_t len, |
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void *resblock); |
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#endif /* md5.h */
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