[Breaking] Local expand_message_xmd with RFC 9380 padding - #109
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Arkworks 0.6
DefaultFieldHasherpadsexpand_message_xmdwith the field element length (48 bytes on Bandersnatch) where RFC 9380 section 5.3.1 requires the hash block size (128 bytes for SHA-512).hash_to_curve_ell2_xmdruns a localXmdFieldHasherwith the RFC padding, so an arkworks update cannot change the output.HneedsBlockSizeUser. TheSEC_PARAMconst generic is gone.BandersnatchSha512Ell2: newBLINDING_BASE,ACCUMULATOR_BASE,PADDINGand vectors.SUITE_IDis unchanged.DefaultFieldHasherfor the old padding. The second fails when arkworks releases the fix.Proposed upstream fix: arkworks-rs/algebra#1140.