Openssl encryption issues

Hello,
I am using openssl to encrypt a largish file(50GB).  I have tried using aes128 and aes256, and both take around the same amount of time.  I would think that aes256 should take atlease 20% longer than 128, as the program should be doing 4 more iterations.  

I believe aes128 is 10 iterations, and aes256 is supposed to be 14, but based on my observations that may not be happening.  

Is anyone familiar with this tool, or is there a way I'd be able to tell if a file is properly encrypted?

Thanks for any help provided.
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Alex MatzingerDatabase AdministratorAsked:
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TommySzalapskiConnect With a Mentor Commented:
The time it takes to read the file from the disk is probably going to be the biggest part of the task. Whether it computes something over each byte 10 times or 14 times could very well not affect the observable time it takes to run.

If you are doubting your tool, then just find another tool and run both. Check the output and if it matches, the tool is probably fine. AES is fairly common, so you should be able to find another tool that will run the same algorithm if you really feel the need to check.
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Alex MatzingerDatabase AdministratorAuthor Commented:
Thank you for your assistance, i was able to use a couple other encryption tools to verify my results
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