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CMAC (or OMAC1) is the underlying MAC algorithm that provides authentication and integrity for EAX. Is stated in NIST SP 800-38B: Because CMAC is based on an approved symmetric key block cipher, such as the Advanced Encryption Standard (AES) algorithm that is specified in Federal Information Processing Standard (FIPS) Pub. 197 [3], CMAC can be ...


Wrapping my (now deleted) comments into an answer… OMAC, as described in the OMAC spec and its addendum, is what Rogaway et al provide security proofs for in their EAX paper. If you take a quick look at RFC 4493, you’ll notice that it states: The National Institute of Standards and Technology (NIST) has recently specified the Cipher-based Message ...

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