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These groups have significant probability of coming up with pwd-value that is equal or greater than the prime and as such, need for going through the PWE derivation loop multiple times. This can result in sufficient timing different to allow an external observer to determine how many rounds are needed and that can leak information about the used password. Force at least 40 loop rounds for these MODP groups similarly to the ECC group design to mask timing. This behavior is not described in IEEE Std 802.11-2016 for SAE, but it does not result in different values (i.e., only different timing), so such implementation specific countermeasures can be done without breaking interoperability with other implementation. Note: These MODP groups 22, 23, and 24 are not considered sufficiently strong to be used with SAE (or more or less anything else). As such, they should never be enabled in runtime configuration for any production use cases. These changes to introduce additional protection to mask timing is only for completeness of implementation and not an indication that these groups should be used. This is related to CVE-2019-9494. Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
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