md5-gnu.h
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上传日期:2009-11-15
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- /* Declaration of functions and data types used for MD5 sum computing
- library functions.
- Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public License as
- published by the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Library General Public License for more details.
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If not,
- write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
- #ifndef _MD5_H
- #define _MD5_H 1
- #include <stdio.h>
- #if defined HAVE_LIMITS_H || _LIBC
- # include <limits.h>
- #endif
- /* The following contortions are an attempt to use the C preprocessor
- to determine an unsigned integral type that is 32 bits wide. An
- alternative approach is to use autoconf's AC_CHECK_SIZEOF macro, but
- doing that would require that the configure script compile and *run*
- the resulting executable. Locally running cross-compiled executables
- is usually not possible. */
- #ifdef _LIBC
- # include <sys/types.h>
- typedef u_int32_t md5_uint32;
- #else
- # if defined __STDC__ && __STDC__
- # define UINT_MAX_32_BITS 4294967295U
- # else
- # define UINT_MAX_32_BITS 0xFFFFFFFF
- # endif
- /* If UINT_MAX isn't defined, assume it's a 32-bit type.
- This should be valid for all systems GNU cares about because
- that doesn't include 16-bit systems, and only modern systems
- (that certainly have <limits.h>) have 64+-bit integral types. */
- # ifndef UINT_MAX
- # define UINT_MAX UINT_MAX_32_BITS
- # endif
- # if UINT_MAX == UINT_MAX_32_BITS
- typedef unsigned int md5_uint32;
- # else
- # if USHRT_MAX == UINT_MAX_32_BITS
- typedef unsigned short md5_uint32;
- # else
- # if ULONG_MAX == UINT_MAX_32_BITS
- typedef unsigned long md5_uint32;
- # else
- /* The following line is intended to evoke an error.
- Using #error is not portable enough. */
- "Cannot determine unsigned 32-bit data type."
- # endif
- # endif
- # endif
- #endif
- #undef __P
- #if defined (__STDC__) && __STDC__
- # define __P(x) x
- #else
- # define __P(x) ()
- #endif
- /* Structure to save state of computation between the single steps. */
- struct md5_ctx
- {
- md5_uint32 A;
- md5_uint32 B;
- md5_uint32 C;
- md5_uint32 D;
- md5_uint32 total[2];
- md5_uint32 buflen;
- char buffer[128];
- };
- /*
- * The following three functions are build up the low level used in
- * the functions `md5_stream' and `md5_buffer'.
- */
- /* Initialize structure containing state of computation.
- (RFC 1321, 3.3: Step 3) */
- extern void __md5_init_ctx __P ((struct md5_ctx *ctx));
- extern void md5_init_ctx __P ((struct md5_ctx *ctx));
- /* Starting with the result of former calls of this function (or the
- initialization function update the context for the next LEN bytes
- starting at BUFFER.
- It is necessary that LEN is a multiple of 64!!! */
- extern void __md5_process_block __P ((const void *buffer, size_t len,
- struct md5_ctx *ctx));
- extern void md5_process_block __P ((const void *buffer, size_t len,
- struct md5_ctx *ctx));
- /* Starting with the result of former calls of this function (or the
- initialization function update the context for the next LEN bytes
- starting at BUFFER.
- It is NOT required that LEN is a multiple of 64. */
- extern void __md5_process_bytes __P ((const void *buffer, size_t len,
- struct md5_ctx *ctx));
- extern void md5_process_bytes __P ((const void *buffer, size_t len,
- struct md5_ctx *ctx));
- /* Process the remaining bytes in the buffer and put result from CTX
- in first 16 bytes following RESBUF. The result is always in little
- endian byte order, so that a byte-wise output yields to the wanted
- ASCII representation of the message digest.
- IMPORTANT: On some systems it is required that RESBUF is correctly
- aligned for a 32 bits value. */
- extern void *__md5_finish_ctx __P ((struct md5_ctx *ctx, void *resbuf));
- extern void *md5_finish_ctx __P ((struct md5_ctx *ctx, void *resbuf));
- /* Put result from CTX in first 16 bytes following RESBUF. The result is
- always in little endian byte order, so that a byte-wise output yields
- to the wanted ASCII representation of the message digest.
- IMPORTANT: On some systems it is required that RESBUF is correctly
- aligned for a 32 bits value. */
- extern void *__md5_read_ctx __P ((const struct md5_ctx *ctx, void *resbuf));
- extern void *md5_read_ctx __P ((const struct md5_ctx *ctx, void *resbuf));
- /* Compute MD5 message digest for bytes read from STREAM. The
- resulting message digest number will be written into the 16 bytes
- beginning at RESBLOCK. */
- extern int __md5_stream __P ((FILE *stream, void *resblock));
- /* Compute MD5 message digest for LEN bytes beginning at BUFFER. The
- result is always in little endian byte order, so that a byte-wise
- output yields to the wanted ASCII representation of the message
- digest. */
- extern void *__md5_buffer __P ((const char *buffer, size_t len,
- void *resblock));
- extern void *md5_buffer __P ((const char *buffer, size_t len,
- void *resblock));
- #endif /* md5.h */