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dragonfly: Disable use of groups using Brainpool curves

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Disable groups that use Brainpool curves for now since they leak more
timing information due to the prime not being close to a power of two.
This removes use of groups 28, 29, and 30 from SAE and EAP-pwd.

Signed-off-by: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2019-07-27 23:19:17 +03:00
parent 14b408c04c
commit 876c5eaa6d
1 changed files with 4 additions and 2 deletions
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src/common/dragonfly.c
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@ -21,9 +21,11 @@ int dragonfly_suitable_group(int group, int ecc_only)
* purposes: FFC groups whose prime is >= 3072 bits and ECC groups
* defined over a prime field whose prime is >= 256 bits. Furthermore,
* ECC groups defined over a characteristic 2 finite field and ECC
* groups with a co-factor greater than 1 are not suitable. */
* groups with a co-factor greater than 1 are not suitable. Disable
* groups that use Brainpool curves as well for now since they leak more
* timing information due to the prime not being close to a power of
* two. */
return group == 19 || group == 20 || group == 21 ||
group == 28 || group == 29 || group == 30 ||
(!ecc_only &&
(group == 15 || group == 16 || group == 17 || group == 18));
}