So I've been looking at these test vectors for the Known Answer Test for AES / Rijndael (with 128-bit block) in CBC mode, and I wonder: what kind of padding do they use? PKCS7?
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The Zip archive you link to contains a file called katmct.pdf which describes how the tests are computed. There is no padding; for each test, the data already has the 128-bit length that the algorithm expects.
Thomas Pornin
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In retrospect, this was an RTFM question. Thank you for being kind. – J. Polfer Jun 16 '10 at 18:48