Greetings! We have found a bug in GOST89-MAC implementation. In case when we calculate the mac for less then 8 bytes, we should provide zero-bytes padding to 16 bytes. In case of zero-length data, the MAC should be zero-bytes. The patches are attached, both for the engine and for the corresponding gostsums utility.
Thank you! -- SY, Dmitry Belyavsky
mac.diff
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nullhash.diff
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