397cfa61dd
Database tüddelei DBHanlder läuft gut für DIESE Datanbank struktur... App begonnen aber weit entfernt von gutem Stand
36 lines
1.3 KiB
Matlab
36 lines
1.3 KiB
Matlab
function hash = calculateMD5Hash(filename)
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% CALCULATEMD5HASH calculate a MD5 hash of a file
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%
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% This functionality is built-in into Octave but uses Java in MATLAB.
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switch getEnvironment
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case 'Octave'
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hash = md5sum(filename);
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case 'MATLAB'
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% There are some MD5 implementations in MATLAB, but those
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% tend to be slow and licensing is unclear.
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% Rolling our own implementation is unwanted, especially since this
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% is a cryptographic hash, even though its security has been
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% broken. Instead we make use of the Java libraries.
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% Unless the "-nojvm" flag is specified, this should work well.
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MD5 = java.security.MessageDigest.getInstance('MD5');
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% Open the file
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fid = fopen(filename, 'r');
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% Make sure fid is closed
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finally_close = onCleanup(@()fclose(fid));
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% Faster file digest based on code by Jan Simon as in
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% http://www.mathworks.com/matlabcentral/fileexchange/31272-datahash
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data = fread(fid, '*uint8');
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MD5.update(data);
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hash = reshape(dec2hex(typecast(MD5.digest(),'uint8')).', 1, 32);
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end
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hash = lower(hash);
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end
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