CVE-2026-15432 When verifying a mac with a ChunkedMacVerification object, Tink compares the resulting tag with non constant time…

Description

When verifying a mac with a ChunkedMacVerification object, Tink compares the resulting tag with non constant time comparison. This potentially allows an attacker to use timinig information as a side channel in order to get information how many bytes of a given tag match the correct tag. This in turn could allow to find a correct tag bytewise.

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