Algorithm 2: The process of the EdDSA signature between role A and role B.

$\begin{array}{l}\mathrm{fuction} \mathrm{Sign}(\mathrm{String} r,\mathrm{String} s,\mathrm{String} M,\mathrm{String} Q\left)\right\{\\ R=r\times G;\\ k=H(R,M,Q);\\ S=(r+k\times s);\\ \mathrm{return}(R,S);\\ \}\end{array}$