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MD5 in MATLAB

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26 Jun 2005 (Updated )

An MD5 C-mex function for MATLAB. It takes less than 1 minute for a 700MB file size.

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Description

This MATLAB version MD5 is for checksum of files and strings. The speed is very fast. A timer shows time taken to finish the process in seconds.

Just type: mMD5('filename') for a file or mMD5('string') for a string, eg., mMD5('abcd').

Reference: Tian-tai Huynh, MD5 in C

Acknowledgements

This file inspired Calc Md5.

MATLAB release MATLAB 6.5 (R13)
Other requirements Visual C++ 6
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Comments and Ratings (13)
21 Mar 2013 wendong wang

very good

03 Sep 2012 Jurek Dziewierz

there is a bug in this procedure, the last byte of the binary C-string is not set to zero, causing the procedure to return random length string. On some systems it might work OK, on others it might crash.
The fix is to change few last lines to enforce zero at the last byte:

change the line:
output = mxCalloc(32, sizeof(char));

to:
output = mxCalloc(33, sizeof(char));

and then

/* call the C subroutine */
mMDFile(input_buf, output);
output[32]=(char)0; // FIX HERE
plhs[0] = mxCreateString(output);
mxFree(output);

06 Jul 2012 David Smith

This produces incorrect MD5 check sums. When I create a random array and save it to a MAT file, your function gives a different checksum than the system-supplied checksum command on both Mac OS X and Ubuntu Linux (and both of them agree with each other).

30 Jun 2011 Pedro valdez  
05 May 2009 Ryan Ollos

There are several problems with this function:

1. printf statements are used rather than mexPrintf.
2. The output char array needs to be 1 greater in length.
3. Memory allocated to the output char array is deallocated before the function exits.

If anyone would like a working version, feel free to message me.

05 May 2009 Ryan Ollos

I've compiled this in r2009a under Vista 32bit using lcc.

I'm getting a segfault nearly everytime I call this:

The process takes 0 seconds
MEMORY BLOCK INTEGRITY FAILURE: ptr = 0x1F39FD40 caller = free(ptr)
Data has been written off the end of a memory block.
This block of memory has already been freed.
The size of the array was 32 bytes.
The value of the free counter is count = 288020,
alloc counter in header of memory block = 384563.

09 Oct 2008 Devang gandhi

I am getting core dump after I run an excel file through the algorithm. Any suggestions as to why that is the case?

21 Jul 2008 Anthony Kendall

Great! It compiles with no problems (WinXP, R2008a, Visual C++), and runs very quickly.

It's just as fast as external MD5 programs, for instance MD5deep.exe on WinXP, and produces identical results.

30 May 2008 Dinesh Zende

This function is really great... It had saved my lot of work

17 Jan 2008 Tobias Schweickhardt

Superb tool!
For those not familiar with c-mex functions: type "mex mMD5" to compile before use. Also works with LCC (MSVC not necessary).

12 Aug 2007 Dmitry Antonov

It really works very fast! Thanks a lot.

10 Jan 2006 Frank ???

Great tool! Thanks.
Frank

12 Jul 2005 Ulrik Kjems

I would like to get the MD5 sum returned as a matlab string argument.
Also I would like to be able to call the function incrementially so that the md5sum could be computed over many variables.

Updates
14 Jul 2005

The file has been updated to save the MD5 sum in a variable. For example:

% for a file
a = mMD5('filename')

% for a string
a = mMD5('string')

14 Jul 2005

That is a good point to have the MD5 sum output stored in a string. The file has been updated. To use this function, just do:
% for a file:
a = mMD5('contents.m')
or
% for a string:
a = mMD5('abcd')
the MD5 sum now is saved in variable a.

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