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I was searching for libraries/modules for encryption of data and found a few such as M2Crypto and GNUTLS but both of them don't support CMAC which is what I wanted to use for authentication. Anyone know of better alternatives ? They do support AES-CBC and RSA so they are definitely not out of favor.

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Your question isn't really on topic here. See the FAQ. This site focuses on cryptography from a theoretical and mathematical aspect. I'm going to have to close the question. For python though I typically use pycrypto. Not sure if it fits your needs though. – mikeazo♦ Nov 14 '12 at 0:21

closed as off topic by mikeazo♦ Nov 14 '12 at 0:21

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