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/* md5.h - Declaration of functions and data types used for MD5 sum |
computing library functions. |
Copyright 1995, 1996, 2000 Free Software Foundation, Inc. |
NOTE: The canonical source of this file is maintained with the GNU C |
Library. Bugs can be reported to bug-glibc@prep.ai.mit.edu. |
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This program is free software; you can redistribute it and/or modify it |
under the terms of the GNU General Public License as published by the |
Free Software Foundation; either version 2, or (at your option) any |
later version. |
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This program 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 General Public License for more details. |
|
You should have received a copy of the GNU General Public License |
along with this program; if not, write to the Free Software Foundation, |
Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ |
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#ifndef _MD5_H |
#define _MD5_H 1 |
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#include <stdio.h> |
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#if defined HAVE_LIMITS_H || _LIBC |
# include <limits.h> |
#endif |
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#include "ansidecl.h" |
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/* 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. */ |
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#ifdef _LIBC |
# include <sys/types.h> |
typedef u_int32_t md5_uint32; |
typedef uintptr_t md5_uintptr; |
#elif defined (HAVE_SYS_TYPES_H) && defined (HAVE_STDINT_H) |
#include <stdint.h> |
#include <sys/types.h> |
typedef uint32_t md5_uint32; |
typedef uintptr_t md5_uintptr; |
#else |
# define INT_MAX_32_BITS 2147483647 |
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/* 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. */ |
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# ifndef INT_MAX |
# define INT_MAX INT_MAX_32_BITS |
# endif |
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# if INT_MAX == INT_MAX_32_BITS |
typedef unsigned int md5_uint32; |
# else |
# if SHRT_MAX == INT_MAX_32_BITS |
typedef unsigned short md5_uint32; |
# else |
# if LONG_MAX == INT_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 |
/* We have to make a guess about the integer type equivalent in size |
to pointers which should always be correct. */ |
typedef unsigned long int md5_uintptr; |
#endif |
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#ifdef __cplusplus |
extern "C" { |
#endif |
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/* 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; |
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md5_uint32 total[2]; |
md5_uint32 buflen; |
char buffer[128] ATTRIBUTE_ALIGNED_ALIGNOF(md5_uint32); |
}; |
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/* |
* The following three functions are build up the low level used in |
* the functions `md5_stream' and `md5_buffer'. |
*/ |
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/* Initialize structure containing state of computation. |
(RFC 1321, 3.3: Step 3) */ |
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 |
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 (const void *buffer, size_t len, |
struct md5_ctx *ctx); |
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/* 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 (const void *buffer, size_t len, |
struct md5_ctx *ctx); |
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/* 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. |
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IMPORTANT: On some systems it is required that RESBUF is correctly |
aligned for a 32 bits value. */ |
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 |
always in little endian byte order, so that a byte-wise output yields |
to the wanted ASCII representation of the message digest. |
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IMPORTANT: On some systems it is required that RESBUF is correctly |
aligned for a 32 bits value. */ |
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 |
resulting message digest number will be written into the 16 bytes |
beginning at RESBLOCK. */ |
extern int md5_stream (FILE *stream, void *resblock); |
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/* 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 (const char *buffer, size_t len, void *resblock); |
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#ifdef __cplusplus |
} |
#endif |
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#endif |