es256k.cpp

#include <iostream>
#include <jwt-cpp/jwt.h>

int main() {
	// openssl ecparam -name secp256k1 -genkey -noout -out ec-secp256k1-priv-key.pem
	std::string es256k_priv_key = R"(-----BEGIN EC PRIVATE KEY-----
MHQCAQEEIArnQWnspKtjiVuZuzuZ/l1Uqqq8gb2unLJ/6U/Saf4ioAcGBSuBBAAK
oUQDQgAEfy03KCKUpIPMIJBtIG4xOwGm0Np/yHKaK9EDZi0mZ7VUeeNKq476CU5X
940yusahgneePQrDMF2nWFEtBCOiXQ==
-----END EC PRIVATE KEY-----)";
	// openssl ec -in ec-secp256k1-priv-key.pem -pubout > ec-secp256k1-pub-key.pem
	std::string es256k_pub_key = R"(-----BEGIN PUBLIC KEY-----
MFYwEAYHKoZIzj0CAQYFK4EEAAoDQgAEfy03KCKUpIPMIJBtIG4xOwGm0Np/yHKa
K9EDZi0mZ7VUeeNKq476CU5X940yusahgneePQrDMF2nWFEtBCOiXQ==
-----END PUBLIC KEY-----)";

	auto token = jwt::create()
					 .set_issuer("auth0")
					 .set_type("JWT")
					 .set_id("es256k-create-example")
					 .set_issued_at(std::chrono::system_clock::now())
					 .set_expires_at(std::chrono::system_clock::now() + std::chrono::seconds{36000})
					 .set_payload_claim("sample", jwt::claim(std::string{"test"}))
					 .sign(jwt::algorithm::es256k(es256k_pub_key, es256k_priv_key, "", ""));

	std::cout << "token:\n" << token << std::endl;

	auto verify = jwt::verify()
					  .allow_algorithm(jwt::algorithm::es256k(es256k_pub_key, es256k_priv_key, "", ""))
					  .with_issuer("auth0");

	auto decoded = jwt::decode(token);

	verify.verify(decoded);

	for (auto& e : decoded.get_header_claims())
		std::cout << e.first << " = " << e.second.to_json() << std::endl;
	for (auto& e : decoded.get_payload_claims())
		std::cout << e.first << " = " << e.second.to_json() << std::endl;
}