instruction using its own random number // generator in addition to the random number we supply. switch kdsa(functionCode+136, &params) { case 0: // success elementSize := (c.N.BitLen() + 7) / 8 r, err := trimBlock(params[:blockSize], elementSize) if err != nil { return nil, err } s, err := trimBlock(params[blockSize:2*blockSize], elementSize) if err != nil { return nil, err } return &Signature{R: r, S: s}, nil case 1: // error return nil, errors.New("zero parameter") case 2: // retry continue } } }...