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I can create RSA keys and X509 certificate using C++ code snippet. But keys are saved to the disk. That is not secure. So if there is any way to save them to Keychain or if there is any way to create X509 certificate using swift??EVP_PKEY* generate_key(){ /* Allocate memory for the EVP_PKEY structure. */ EVP_PKEY * pkey = EVP_PKEY_new(); if(!pkey) { std::cerr << "Unable to create EVP_PKEY structure." << std::endl; return NULL; } /* Generate the RSA key and assign it to pkey. */ RSA * rsa = RSA_generate_key(2048, RSA_F4, NULL, NULL); if(!EVP_PKEY_assign_RSA(pkey, rsa)) { std::cerr << "Unable to generate 2048-bit RSA key." << std::endl; EVP_PKEY_free(pkey); return NULL; } /* The key has been generated, return it. */ return pkey;}/* Generates a self-signed x509 certificate. */X509* generate_x509(EVP_PKEY * pkey){ /* Allocate memory for the X509 structure. */ X509 * x509 = X509_new(); if(!x509) { std::cerr << "Unable to create X509 structure." << std::endl; return NULL; } /* Set the serial number. */ ASN1_INTEGER_set(X509_get_serialNumber(x509), 1); /* This certificate is valid from now until exactly one year from now. */ X509_gmtime_adj(X509_get_notBefore(x509), 0); X509_gmtime_adj(X509_get_notAfter(x509), 31536000L); /* Set the public key for our certificate. */ X509_set_pubkey(x509, pkey); /* We want to copy the subject name to the issuer name. */ X509_NAME * name = X509_get_subject_name(x509); /* Set the country code and common name. */ X509_NAME_add_entry_by_txt(name, "C", MBSTRING_ASC, (unsigned char *)"SriLanka", -1, -1, 0); X509_NAME_add_entry_by_txt(name, "O", MBSTRING_ASC, (unsigned char *)"Authnex", -1, -1, 0); X509_NAME_add_entry_by_txt(name, "CN", MBSTRING_ASC, (unsigned char *)"MyCompany", -1, -1, 0); /* Now set the issuer name. */ X509_set_issuer_name(x509, name); /* Actually sign the certificate with our key. */ if(!X509_sign(x509, pkey, EVP_sha256())) { std::cerr << "Error signing certificate." << std::endl; X509_free(x509); return NULL; } return x509;}bool write_to_disk(EVP_PKEY * pkey, X509 * x509){ /* Open the PEM file for writing the key to disk. */ char buffer[256]; strcpy(buffer,getenv("HOME")); strcat(buffer,"/Documents/key.pem"); FILE * pkey_file = fopen(buffer, "w"); if(!pkey_file) { std::cerr << "Unable to open \"key.pem\" for writing." << std::endl; return false; } /* Write the key to disk. */ bool ret = PEM_write_PrivateKey(pkey_file, pkey, NULL, NULL, 0, NULL, NULL); fclose(pkey_file); char bufferPub[256]; strcpy(bufferPub,getenv("HOME")); strcat(bufferPub,"/Documents/pubkey.pem"); FILE * pkey_file_pub = fopen(bufferPub, "w"); if(!pkey_file_pub) { std::cerr << "Unable to open \"pubkey.pem\" for writing." << std::endl; return false; } ret = PEM_write_PUBKEY(pkey_file_pub, pkey); fclose(pkey_file_pub); if(!ret) { std::cerr << "Unable to write private key to disk." << std::endl; return false; } /* Open the PEM file for writing the certificate to disk. */ char bufferForCert[256]; strcpy(bufferForCert,getenv("HOME")); strcat(bufferForCert,"/Documents/cert.pem"); FILE * x509_file = fopen(bufferForCert, "w"); if(!x509_file) { std::cerr << "Unable to open \"cert.pem\" for writing." << std::endl; return false; } /* Write the certificate to disk. */ ret = PEM_write_X509(x509_file, x509); fclose(x509_file); if(!ret) { std::cerr << "Unable to write certificate to disk." << std::endl; return false; } return true;}Thanks