One-key MAC

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OMAC (One-key MAC) is a message authentication code constructed from a block cipher much like the CBC-MAC algorithm.

Officially there are two OMAC algorithms (OMAC1 and OMAC2) which are both essentially the same except for a small tweak. OMAC1 is equivalent to CMAC which became an NIST recommendation in May 2005.

It is free for all uses (no patents).

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v t e Hash functions & message authentication codes
Security summary
Common functions	MD5 SHA-1 SHA-2 SHA-3/Keccak
SHA-3 finalists	BLAKE Grøstl JH Skein Keccak (winner)
Other functions	FSB ECOH GOST HAS-160 HAVAL Kupyna LM hash MDC-2 MD2 MD4 MD5 MD6 N-Hash RadioGatún RIPEMD SipHash Snefru Streebog SWIFFT Tiger VSH WHIRLPOOL crypt(3) (DES)
MAC algorithms	DAA CBC-MAC HMAC OMAC/CMAC PMAC VMAC UMAC Poly1305
Authenticated encryption modes	CCM CWC EAX GCM IAPM OCB
Attacks	Collision attack Preimage attack Birthday attack Brute force attack Rainbow table Side-channel attack Length extension attack
Design	Avalanche effect Hash collision Merkle–Damgård construction
Standardization	CRYPTREC NESSIE NIST hash function competition
Utilization	Salt Key stretching Message authentication
Key derivation functions	bcrypt PBKDF2 scrypt

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