Comments (3)
Hi @amosnier -
When I uploaded the CTR-mode test code, I was pondering how long before someone would comment on that :D
The intuitive thing would be to decrypt the cipher text and check for equivalence with the plain text.
However, in the NIST test-vectors from 800-38A the test-vectors are equal for encryption and decryption. Same input and output to test both encryption and decryption.
I have done a lot more testing than what is in test.c
and indeed encryption and decryption in CTR (all all the other modes) works as advertised even though the test-file doesn't test very thoroughly.
The test-code is meant to be a quick way for users to verify against the NIST vectors.
It is not meant to convince you of correctness or robustness.
Thanks again for pointing this out :)
from tiny-aes-c.
Hi @kokke ,
Thanks for your answer. I realize that you are right when checking again SP 800-38A. The test strings are inverted between Encrypt and Decrypt, but so are the field names "Cyphertext" and "Plaintext". :-)
Not so intuitive.
Anyway, thanks again.
Best regards,
Alain Mosnier
from tiny-aes-c.
Hi @amosnier - yeah that surprised me as well when I implemented the test code :)
from tiny-aes-c.
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