PSA_PAKE_STEP_KEY_SHARE macro

The key share being sent to or received from the peer. The format for both input and output at this step is the same as for public keys on the group determined by the primitive (::psa_pake_primitive_t) would be. For more information on the format, consult the documentation of psa_export_public_key(). For information regarding how the group is determined, consult the documentation #PSA_PAKE_PRIMITIVE.