I have an NSDictionary that has to be written to disk, distributed and read in 
again. 
I would like to add an MD5 sum to the dictionary to make sure it has not been 
modified/corrupted on the way. That can be done by making NSData using 
NSArchiver and then passing it to MD5() from <openssl/md5.h>. 
 
But, the order in which keys/values are stored in the dict is not fixed. I 
would like to know if there is a simple way to get a unique (reproducable) 
MD5-sum.
 
 
Thanks in advance,
Arthur
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