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/* md5.h - Declaration of functions and data types used for MD5 sum |
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computing library functions. |
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Copyright (C) 1995, 1996, 1999, 2000, 2003 Free Software Foundation, Inc. |
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NOTE: The canonical source of this file is maintained with the GNU C |
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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 |
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under the terms of the GNU General Public License as published by the |
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Free Software Foundation; either version 2, or (at your option) any |
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later version. |
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This program 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 |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software Foundation, |
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
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#ifndef _MD5_H |
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#define _MD5_H 1 |
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#include <inttypes.h> |
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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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typedef uint32_t md5_uint32; |
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typedef uintptr_t md5_uintptr; |
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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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}; |
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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, int 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, int 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 be 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 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, int len, void *resblock); |
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#endif |