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kokke avatar kokke commented on August 19, 2024

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 :)

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amosnier avatar amosnier commented on August 19, 2024

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.

kokke avatar kokke commented on August 19, 2024

Hi @amosnier - yeah that surprised me as well when I implemented the test code :)

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