@item Generates DH keypair: @code{SDHPriv}/@code{SDHPub}.
@item Computes common shared key @code{K = H(DH(SDHPriv, CDHPub))}.
@item Generates 64-bit random number @code{RS}.
@item Generates DH keypair: @code{SDHPriv}/@code{SDHPub}.
@item Computes common shared key @code{K = H(DH(SDHPriv, CDHPub))}.
@item Generates 64-bit random number @code{RS}.