verify mls membership and confirmation tags in constant time#2316
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rootvector2 wants to merge 1 commit into
Closed
verify mls membership and confirmation tags in constant time#2316rootvector2 wants to merge 1 commit into
rootvector2 wants to merge 1 commit into
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Thanks for the patch, merged with minor revisions. Now on https://www.bouncycastle.org/betas |
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found by auditing mls MAC verification:
PublicMessage.unprotectandGroupcompared a secret-keyed HMAC membership/confirmation tag against the wire value with early-exitArrays.areEqual/Arrays.equals, a byte-by-byte timing oracle reachable fromGroup.handle(byte[]), so all three sites now useArrays.constantTimeAreEquallike the rest of the library.