Description of the Intermediate Value Known Answer Test
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The test encrypts one plaintext with a variable number of rounds.
In ECB encryption mode, the output PTi is the output after the 
initial key addition and i rounds (a round ends with a key
addition). 

As explained in the documentation, in ECB decryption mode 
there are several definitions of a `round' possible. In order
to make visual inspection more intuitive, we output the
intermediate values that correspond with the output of the
encryption mode. 
These values might actually not occur in a practical decryption,
especially in an optimised implementation, where various operations
of different rounds are interchanged.

This explains also why the Java and the C code output different
files for this test.