static int mulg_item_count(element_ptr e) { return element_item_count(e->data); }
bool Manager::JoinMember(string request, string & respond) { //elements element_t Pi1; element_t Pi2; element_t Sk; element_t R; element_init_G1(Pi1,pairing); element_init_GT(Pi2, pairing); element_init_Zr(Sk, pairing); element_init_G1(R,pairing); //read & check SoK string hash; string hash_check; RequestFromString(request,hash,Sk,Pi1); //check Pi1 is point of curve if(element_item_count(Pi1)!=2) { element_clear(Pi1); element_clear(Pi2); element_clear(Sk); element_clear(R); return 1;//failure } element_t tmp1, tmp2; element_t c_Hsok; element_init_G1(tmp1, pairing); element_init_G1(tmp2, pairing); element_init_Zr(c_Hsok, pairing); element_from_hash(c_Hsok,(void*)hash.c_str(),hash.length()); element_pow_zn(tmp1,g,Sk); element_pow_zn(tmp2,Pi1,c_Hsok); element_div(R,tmp1,tmp2); hash_check=Helper::Hash_g_R(g,R); if(hash.compare(hash_check)) { element_clear(Pi1); element_clear(Pi2); element_clear(Sk); element_clear(R); element_clear(tmp1); element_clear(tmp2); element_clear(c_Hsok); return 1;//failure } //generate r_issuer element_t issuer_r; element_init_Zr(issuer_r, pairing); element_random(issuer_r); //create a b c element_t ai; element_t bi; element_t ci; element_t temp_ci1; element_t temp_ci2; //init element_init_G1(ai, pairing); element_init_G1(bi, pairing); element_init_G1(ci, pairing); element_init_G1(temp_ci1, pairing); element_init_G1(temp_ci2, pairing); //compute ai bi ci element_pow_zn(ai,g,issuer_r);//ai element_pow_zn(bi,ai,y);//bi element_pow_zn(temp_ci1,ai,x); element_pow_zn(temp_ci2,Pi1,issuer_r); element_pow_zn(temp_ci2,temp_ci2,x); element_pow_zn(temp_ci2,temp_ci2,y); element_mul(ci,temp_ci1,temp_ci2);//ci //create RESPOND respond=MemberSecretToString(ai,bi,ci); //compute Pi2 element_pairing(Pi2,Pi1,g); //Write_to_reg_list AddToRegistrationList(Pi1, Pi2); //clear elements element_clear(issuer_r); element_clear(Pi1); element_clear(Pi2); element_clear(temp_ci1); element_clear(temp_ci2); element_clear(tmp1); element_clear(tmp2); element_clear(c_Hsok); element_clear(Sk); element_clear(R); element_clear(ai); element_clear(bi); element_clear(ci); return 0;//success }