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author | Jim Meyering <jim@meyering.net> | 1995-07-20 17:52:49 +0000 |
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committer | Jim Meyering <jim@meyering.net> | 1995-07-20 17:52:49 +0000 |
commit | dfe3d8837e25004d3cc02406ed7a50f347de4543 (patch) | |
tree | aeef97d6edf9c47a11d55ba374ebae0a67505485 /lib/md5.h | |
parent | e59ec88ea2c14cd834e216fa8dc426033891f4ad (diff) | |
download | coreutils-dfe3d8837e25004d3cc02406ed7a50f347de4543.tar.xz |
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Diffstat (limited to 'lib/md5.h')
-rw-r--r-- | lib/md5.h | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/lib/md5.h b/lib/md5.h new file mode 100644 index 000000000..501b4d233 --- /dev/null +++ b/lib/md5.h @@ -0,0 +1,109 @@ +/* md5.h - Declaration of functions and data types used for MD5 sum + computing library functions. + Copyright (C) 1995 Free Software Foundation, Inc. + +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. + +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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +#ifndef _MD5_H +#define _MD5_H + +#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. */ + +#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 + +/* 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; +}; + +/* + * 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) */ +void md5_init_ctx __P ((struct md5_ctx *ctx)); + +/* Starting with the result of former calls of this function (or the + initialzation function update the context for the next LEN bytes + starting at BUFFER. + It is necessary that LEN is a multiple of 64!!! */ +void md5_process_block __P ((const void *buffer, size_t len, + struct md5_ctx *ctx)); + +/* 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. */ +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. */ +void * +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. */ +void *md5_buffer __P ((const char *buffer, size_t len, void *resblock)); + +#endif |