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function MD5 = CalcMD5(Data, InClass, OutClass) %#ok<STOUT,INUSD> % 128 bit MD5 checksum: file, string, byte stream [MEX] % This function calculates a 128 bit checksum for arrays and files. % Digest = CalcMD5(Data, [InClass], [OutClass]) % INPUT: % Data: Data array or file name. Either numerical or CHAR array. % Currently only files and arrays with up to 2^32 bytes (2.1GB) are % accepted. % InClass: String to declare the type of the 1st input. % Optional. Default: 'Char'. % 'File': [Data] is a file name as string. The digest is calculated % for this file. % 'Char': [Data] is a char array to calculate the digest for. Only the % ASCII part of the Matlab CHARs is used, such that the digest % is the same as if the array is written to a file as UCHAR, % e.g. with FWRITE. % 'Unicode': All bytes of the input [Data] are used to calculate the % digest. This is the standard for numerical input. % OutClass: String, format of the output. Just the first character matters. % Optional, default: 'hex'. % 'hex': [1 x 32] string as lowercase hexadecimal number. % 'HEX': [1 x 32] string as uppercase hexadecimal number. % 'Dec': [1 x 16] double vector with UINT8 values. % 'Base64': [1 x 22] string, encoded to base 64 (A:Z,a:z,0:9,+,/). % % OUTPUT: % Digest: A 128 bit number is replied in a format depending on [OutClass]. % The chance, that different data sets have the same MD5 sum is about % 2^128 (> 3.4 * 10^38). Therefore MD5 can be used as "finger-print" % of a file rather than e.g. CRC32. % % EXAMPLES: % Three methods to get the MD5 of a file: % 1. Direct file access (recommended): % MD5 = CalcMD5(which('CalcMD5.m'), 'File') % 2. Import the file to a CHAR array (binary mode for exact line breaks!): % FID = fopen(which('CalcMD5.m'), 'rb'); % S = fread(FID, inf, 'uchar=>char'); % fclose(FID); % MD5 = CalcMD5(S, 'char') % 3. Import file as a byte stream: % FID = fopen(which('CalcMD5.m'), 'rb'); % S = fread(FID, inf, 'uint8=>uint8'); % fclose(FID); % MD5 = CalcMD5(S, 'unicode'); // 'unicode' can be omitted here % % Test string: % CalcMD5(char(0:511), 'char', 'HEX') % => F5C8E3C31C044BAE0E65569560B54332 % CalcMD5(char(0:511), 'unicode', 'HEX') % => 3484769D4F7EBB88BBE942BB924834CD % % Tested: Matlab 6.5, 7.7, 7.8, WinXP, [UnitTest] % Author: Jan Simon, Heidelberg, (C) 2009-2010 [email protected] % License: This program is derived from the RSA Data Security, Inc. % MD5 Message Digest Algorithm, RFC 1321, R. Rivest, April 1992 % % See also CalcCRC32. % Michael Kleder has published a Java call to compute the MD5 (and further % check sums): http://www.mathworks.com/matlabcentral/fileexchange/8944 % $JRev: R5.00j V:015 Sum:zh2gTrvHwbd7 Date:17-Dec-2009 02:46:53 $ % $File: CalcMD5\CalcMD5.m $ % History: % 015: 15-Dec-2009 16:53, BUGFIX: UINT32 has 32 bits on 64 bit systems now. % Thanks to Sebastiaan Breedveld! % If the current Matlab path is the parent folder of this script, the % MEX function is not found - change the current directory! error(['JSim:', mfilename, ':NoMex'], 'Cannot find MEX script.');