38 lines
800 B
C
38 lines
800 B
C
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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 filehanle
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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. Therefor 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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