58 lines
1.5 KiB
C
58 lines
1.5 KiB
C
/*
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This file is part of libcapwap.
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libcapwap is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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libcapwap 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 Foobar. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file
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* @brief
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <nettle/md5.h>
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#include "capwap_crypto.h"
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#define BLOCK_SIZE 4096
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/**
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* Calculate MD5 checksum for an opened file.
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* @param digest destination buffer for calculated
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* checksum (16 bytes, for a predifned constant use #CW_MD5_DIGEST_SIZE)
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* @param infile file hanle
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*
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* Remember to set the file pointer to the beginning of the file, before
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* calling this function. Therefore use fseek(file,0,SEEK_SET).
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*/
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int cw_fgetmd5sum ( uint8_t *digest, FILE *infile )
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{
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struct md5_ctx ctx;
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uint8_t buffer[BLOCK_SIZE];
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md5_init ( &ctx );
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while ( !feof ( infile ) ) {
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int bytes = fread ( buffer, 1, sizeof ( buffer ), infile );
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md5_update ( &ctx, bytes, buffer );
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}
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if ( ferror ( infile ) )
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return errno;
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md5_digest ( &ctx, MD5_DIGEST_SIZE, digest );
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return 0;
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}
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