ecdsa: refactor prehash_to_field_bytes
to bits2field
free func
#574
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Removes the verbosely named
prehash_to_field_bytes
from theDigestPrimitive
trait, chaning it to abits2field
free function which has aC: PrimeCurve
generic parameter.The name is inspired by
bits2int
from RFC6979, however it does not perform a reduction step.