extract key class from jwk

Author: kleinmrk

include/jwt-cpp/jwt.h

@@ -783,6 +783,40 @@ namespace jwt {
 		}
 	} // namespace helper
 
+	class key {
+	public:
+		static key symmetric(const std::string& bytes) { return key(bytes); }
+
+		static key asymmetric(std::shared_ptr<EVP_PKEY> pkey) { return key(pkey); }
+
+		std::string get_symmetric_key() const {
+			if (!is_symmetric) { throw std::logic_error("not a symmetric key"); }
+
+			return oct_key;
+		}
+
+		std::shared_ptr<EVP_PKEY> get_asymmetric_key() const {
+			if (is_symmetric) { throw std::logic_error("not an asymmetric key"); }
+
+			return pkey;
+		}
+
+	private:
+		key(const std::string& key) {
+			is_symmetric = true;
+			oct_key = key;
+		}
+
+		key(std::shared_ptr<EVP_PKEY> key) {
+			is_symmetric = false;
+			pkey = key;
+		}
+
+		bool is_symmetric;
+		std::shared_ptr<EVP_PKEY> pkey;
+		std::string oct_key;
+	};
+
 	/**
 	 * \brief Various cryptographic algorithms when working with JWT
 	 *
@@ -3105,7 +3139,7 @@ namespace jwt {
 		JWT_CLAIM_EXPLICIT jwk(const typename json_traits::value_type& json) : jwk(json_traits::as_object(json)) {}
 
 		JWT_CLAIM_EXPLICIT jwk(const typename json_traits::object_type& json)
-			: jwk_claims(json), key(build_key(jwk_claims)) {
+			: jwk_claims(json), k(build_key(jwk_claims)) {
 			// https://datatracker.ietf.org/doc/html/rfc7518#section-6.1
 			// * indicate required params
 			// "kty"* : "EC", "RSA", "oct"
@@ -3301,50 +3335,16 @@ namespace jwt {
 
 		bool empty() const noexcept { return jwk_claims.empty(); }
 
-		std::shared_ptr<EVP_PKEY> get_pkey() const { return key.get_asymmetric_key(); }
+		std::shared_ptr<EVP_PKEY> get_pkey() const { return k.get_asymmetric_key(); }
 
-		std::string get_oct_key() const { return key.get_symmetric_key(); }
+		std::string get_oct_key() const { return k.get_symmetric_key(); }
 
 		bool supports(const std::string& alg_name) const {
 			const alg_list& x = supported_alg.find(get_key_type())->second;
 			return std::find(x.begin(), x.end(), alg_name) != x.end();
 		}
 
 	private:
-		class key {
-		public:
-			static key symmetric(const std::string& bytes) { return key(bytes); }
-
-			static key asymmetric(std::shared_ptr<EVP_PKEY> pkey) { return key(pkey); }
-
-			std::string get_symmetric_key() const {
-				if (!is_symmetric) { throw std::logic_error("not a symmetric key"); }
-
-				return oct_key;
-			}
-
-			std::shared_ptr<EVP_PKEY> get_asymmetric_key() const {
-				if (is_symmetric) { throw std::logic_error("not an asymmetric key"); }
-
-				return pkey;
-			}
-
-		private:
-			key(const std::string& key) {
-				is_symmetric = true;
-				oct_key = key;
-			}
-
-			key(std::shared_ptr<EVP_PKEY> key) {
-				is_symmetric = false;
-				pkey = key;
-			}
-
-			bool is_symmetric;
-			std::shared_ptr<EVP_PKEY> pkey;
-			std::string oct_key;
-		};
-
 		static std::shared_ptr<EVP_PKEY> build_rsa_key(const details::map_of_claims<json_traits>& claims) {
 			EVP_PKEY* evp_key = nullptr;
 			auto n = jwt::helper::raw2bn(
@@ -3407,7 +3407,7 @@ namespace jwt {
 			}
 		}
 
-		key key;
+		key k;
 	};
 
 	/**