tls_signer_add_keypair_mem
int tls_signer_add_keypair_mem(struct tls_signer *_signer, const uint8_t *_cert,
rv = tls_signer_add_keypair_mem(signer, cert, cert_len, key, key_len);
if (tls_signer_add_keypair_mem(signer, server_ecdsa, server_ecdsa_len,