functions in md5.i -

             state = md5(data)  
            state = md5(data, state)  
            digest = md5(state)  
            digest = md5(state, hex=1)  
 
    compute MD5 digest of data, an array of 16 char  
    with the hex=1 keyword, returned digest is a string (in hex)  
    

             digest = md5sum(filename)  
            digest = md5sum(filename, hex=1)  
 
    compute MD5 digest of a file, an array of 16 char  
    with the hex=1 keyword, returned digest is a string (in hex)