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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2017-02-06 10:49:27 +0000
committerJohannes Berg <johannes.berg@intel.com>2017-02-08 09:19:17 +0100
commitfe8de3da13bdbcbe8b583a3bbadf677da0f04f83 (patch)
treeb57055b47f24bf61bab71eed776f258974d6b6f4 /tools/perf/arch/mips
parentb699b71d82e77203be43bda5ff1b72516f129581 (diff)
mac80211: fils_aead: Use crypto api CMAC shash rather than bare cipher
Switch the FILS AEAD code to use a cmac(aes) shash instantiated by the crypto API rather than reusing the open coded implementation in aes_cmac_vector(). This makes the code more understandable, and allows platforms to implement cmac(aes) in a more secure (*) and efficient way than is typically possible when using the AES cipher directly. So replace the crypto_cipher by a crypto_shash, and update the aes_s2v() routine to call the shash interface directly. * In particular, the generic table based AES implementation is sensitive to known-plaintext timing attacks on the key, to which AES based MAC algorithms are especially vulnerable, given that their plaintext is not usually secret. Time invariant alternatives are available (e.g., based on SIMD algorithms), but may incur a setup cost that is prohibitive when operating on a single block at a time, which is why they don't usually expose the cipher API. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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