included crypto++ lib

CMakeLists.txt

@@ -46,6 +46,17 @@ if(NOT expected_POPULATED)
   FetchContent_Populate(expected)
 endif(NOT expected_POPULATED)
 
+
+# add crypt++ (+cmake) library
+FetchContent_Declare(cryptopp
+GIT_REPOSITORY https://github.com/abdes/cryptopp-cmake.git
+GIT_TAG CRYPTOPP_8_7_0)
+
+if(NOT cryptopp_POPULATED)
+  FetchContent_Populate(cryptopp)
+  add_subdirectory(${cryptopp_SOURCE_DIR} ${cryptopp_BINARY_DIR})
+endif(NOT cryptopp_POPULATED)
+
 include(CTest)
 enable_testing()
 
@@ -71,9 +82,13 @@ doxygen_add_docs( doc
 )
 
 # build common library
-set(LIB_SOURCES src/model.cpp src/model.hpp src/big_int.hpp src/big_int.cpp)
+set(LIB_SOURCES
+  src/model.cpp src/model.hpp
+  src/json_serialisation.cpp
+  src/big_int.hpp src/big_int.cpp )
+
 add_library(oc-mint-lib ${LIB_SOURCES})
-target_link_libraries(oc-mint-lib PUBLIC Crow::Crow)
+target_link_libraries(oc-mint-lib PUBLIC Crow::Crow cryptopp::cryptopp)
 target_include_directories(oc-mint-lib PUBLIC ${expected_SOURCE_DIR}/include src) 
 
 add_executable(${PROJECT_NAME} src/main.cpp)

src/json_serialisation.cpp

@@ -0,0 +1,472 @@
+#include "model.hpp"
+#include "crow/json.h"
+#include "tl/expected.hpp"
+
+#define TO_JSON(name) r[#name]=name
+#define BIGINT_TO_JSON(name) r[#name]=name.to_string()
+#define TO_JSON_JSON(name) r[#name]=name.to_json()
+#define TO_JSON_ARRAY(name) r[#name]=list_to_json(name)
+
+template <class T>
+crow::json::wvalue list_to_json(const std::vector<T> &array) {
+  crow::json::wvalue::list l;
+  for (auto item : array)
+    l.push_back(item.to_json());
+  return crow::json::wvalue(l);
+}
+
+crow::json::wvalue list_to_json(const std::vector<unsigned int> &array) {
+  crow::json::wvalue::list l;
+  for (auto item : array)
+    l.push_back(item);
+  return crow::json::wvalue(l);
+}
+
+crow::json::wvalue PublicKey::to_json() const {
+  crow::json::wvalue r;
+  BIGINT_TO_JSON(modulus);
+  BIGINT_TO_JSON(public_exponent);
+  r["type"]="rsa public key";
+  return r;
+}
+
+crow::json::wvalue WeightedUrl::to_json() const {
+  crow::json::wvalue::list l;
+  crow::json::wvalue w(weight);
+
+  l.push_back(w);
+  l.push_back(url);
+  return l;
+}
+
+crow::json::wvalue CDD::to_json() const {
+
+  crow::json::wvalue r;
+  TO_JSON(additional_info);
+  TO_JSON(cdd_expiry_date);
+  TO_JSON(cdd_location);
+  TO_JSON(cdd_serial);
+  TO_JSON(cdd_signing_date);
+  TO_JSON(currency_divisor);
+  TO_JSON(currency_name);
+  TO_JSON_ARRAY(denominations);
+  BIGINT_TO_JSON(id);
+  TO_JSON_ARRAY(info_service);
+  TO_JSON(issuer_cipher_suite);
+  TO_JSON_JSON(issuer_public_master_key);
+  TO_JSON_ARRAY(mint_service);
+  TO_JSON(protocol_version);
+  TO_JSON_ARRAY(redeem_service);
+  TO_JSON_ARRAY(renew_service);
+
+  r["type"] = "cdd";
+  return r;
+}
+
+crow::json::wvalue CDDC::to_json() const {
+  crow::json::wvalue r;
+  TO_JSON_JSON(cdd);
+  TO_JSON(signature);
+  r["type"] = "cdd certificate";
+  return r;
+}
+
+crow::json::wvalue MintKey::to_json() const {
+  crow::json::wvalue r;
+
+  TO_JSON(cdd_serial);
+  TO_JSON(coins_expiry_date);
+  TO_JSON(denomination);
+  BIGINT_TO_JSON(id);
+  BIGINT_TO_JSON(issuer_id);
+  TO_JSON_JSON(public_mint_key);
+
+  TO_JSON(sign_coins_not_after);
+  TO_JSON(sign_coins_not_before);
+
+  r["type"] = "mint key";
+  return r;
+}
+
+crow::json::wvalue MintKeyCert::to_json() const {
+  crow::json::wvalue r;
+  TO_JSON_JSON(mint_key);
+  TO_JSON(signature);
+  r["type"] = "mint key certificate";
+  return r;
+}
+
+crow::json::wvalue Response::to_json() const {
+  crow::json::wvalue r;
+  TO_JSON(message_reference);
+  TO_JSON(status_code);
+  TO_JSON(status_description);
+  return r;
+}
+
+crow::json::wvalue ResponseCDDCSerial::to_json() const {
+  crow::json::wvalue r = Response::to_json();
+  TO_JSON(cdd_serial);
+
+  r["type"] = "response cdd serial";
+  return r;
+}
+
+tl::expected<RequestCDDCSerial, eError>
+RequestCDDCSerial::from_string(const std::string &str) {
+  auto json = crow::json::load(str);
+  if (!json) {
+    return tl::make_unexpected(eError::JSON_PARSE_ERROR);
+  } else if (!json.has("type") || !json.has("message_reference")) {
+    return tl::make_unexpected(eError::JSON_ERROR);
+  } else if (json["type"] != "request cdd serial") {
+    return tl::make_unexpected(eError::JSON_ERROR);
+  } else {
+    RequestCDDCSerial r;
+    r.message_reference = json["message_reference"].u();
+    return r;
+  }
+}
+
+crow::json::wvalue ResponseCDDC::to_json() const {
+  crow::json::wvalue r = Response::to_json();
+  TO_JSON_JSON(cddc);
+  r["type"] = "response cdd serial";
+  return r;
+}
+
+tl::expected<RequestCDDC, eError>
+RequestCDDC::from_string(const std::string &str) {
+  auto json = crow::json::load(str);
+  if (!json) {
+    return tl::make_unexpected(eError::JSON_PARSE_ERROR);
+  } else if (!(json.has("type") && json.has("message_reference") &&
+               json.has("cdd_serial"))) {
+    return tl::make_unexpected(eError::JSON_MISSING_KEY);
+  } else if (json["type"] != "request cddc") {
+    return tl::make_unexpected(eError::JSON_WRONG_REQUEST_TYPE);
+  } else {
+    RequestCDDC r;
+    r.cdd_serial = json["cdd_serial"].u();
+    r.message_reference = json["message_reference"].u();
+    return r;
+  }
+}
+
+tl::expected<RequestMKCs, eError>
+RequestMKCs::from_string(const std::string &str) {
+  auto json = crow::json::load(str);
+  if (!json) {
+    return tl::make_unexpected(eError::JSON_PARSE_ERROR);
+  } else if (!(json.has("denominations") && json.has("message_reference") &&
+               json.has("mint_key_ids") && json.has("type"))) {
+    return tl::make_unexpected(eError::JSON_MISSING_KEY);
+  } else if (json["type"] != "request mint key certificates") {
+    return tl::make_unexpected(eError::JSON_WRONG_REQUEST_TYPE);
+  } else {
+    RequestMKCs r;
+    r.message_reference = json["message_reference"].u();
+
+    auto denominations = json["denominations"];
+    if (denominations.t() != crow::json::type::List) {
+      return tl::make_unexpected(eError::JSON_WRONG_REQUEST_TYPE);
+    } else {
+      for (auto d : denominations.lo()) {
+        r.denominations.push_back(d.u());
+      }
+    }
+    auto mint_key_ids = json["mint_key_ids"];
+    if (mint_key_ids.t() != crow::json::type::List) {
+      return tl::make_unexpected(eError::JSON_WRONG_REQUEST_TYPE);
+    } else {
+      for (auto k: mint_key_ids.lo()) {
+	auto kv = BigInt::from_string(k.s());
+	if (!kv.has_value()) {
+	  return tl::make_unexpected(eError::JSON_PARSE_ERROR);
+	} else {
+	  r.mint_key_ids.push_back(*kv);
+	}
+      }
+    }
+    return r;
+  }
+}
+
+crow::json::wvalue ResponseMKCs::to_json() const {
+  crow::json::wvalue r = Response::to_json();
+  TO_JSON_ARRAY(keys);
+  r["type"] = "response mint key certificates";
+  return r;
+}
+
+crow::json::wvalue Blind::to_json() const {
+  crow::json::wvalue r;
+  BIGINT_TO_JSON(blinded_payload_hash);
+  BIGINT_TO_JSON(mint_key_id);
+  TO_JSON(reference);
+  r["type"] = "blinded payload hash";
+  return r;
+}
+
+tl::expected<Blind, eError> Blind::from_json(const crow::json::rvalue &json) {
+  if (!(json.has("type")
+	&& json.has("blinded_payload_hash")
+	&& json.has("mint_key_id")
+	&& json.has("reference"))) {
+    return tl::make_unexpected(eError::JSON_ERROR);
+  } else if (json["type"] != "blinded payload hash") {
+    return tl::make_unexpected(eError::JSON_ERROR);
+  } else {
+    Blind r;
+
+    auto hash = BigInt::from_string(json["blinded_payload_hash"].s());
+    if (!hash) {
+      // std::cout << "invalid hash : " <<  json["blinded_payload_hash"].s()
+      // 		<< std::endl;
+      return tl::make_unexpected(eError::JSON_PARSE_ERROR);
+    }
+    r.blinded_payload_hash = hash.value();
+
+    auto key_id = BigInt::from_string(json["mint_key_id"].s());
+    if (!key_id) {
+      return tl::make_unexpected(eError::JSON_PARSE_ERROR);
+    }
+    r.mint_key_id = key_id.value();
+    r.reference = json["reference"].s();
+    return r;
+  }
+}
+
+crow::json::wvalue BlindSignature::to_json() const {
+  crow::json::wvalue r;
+  BIGINT_TO_JSON(blind_signature);
+  TO_JSON(reference);
+  r["type"] = "blind signature";
+  return r;
+}
+
+tl::expected<RequestMint, eError>
+RequestMint::from_string(const std::string &str) {
+  std::vector<Blind> blinds;
+  //  "type": "request mint"
+  auto json = crow::json::load(str);
+  if (!json) {
+    return tl::make_unexpected(eError::JSON_PARSE_ERROR);
+  } else if (!(json.has("type") && json.has("message_reference") &&
+               json.has("transaction_reference") && json.has("blinds"))) {
+    return tl::make_unexpected(eError::JSON_ERROR);
+  } else if (json["type"] != "request mint") {
+    return tl::make_unexpected(eError::JSON_ERROR);
+  } else {
+    RequestMint r;
+    r.message_reference= json["message_reference"].u();
+    auto tr = BigInt::from_string(json["transaction_reference"].s());
+    if (!tr)
+      return tl::make_unexpected(eError::JSON_PARSE_ERROR);
+      
+    r.transaction_reference = *tr;
+    if (json["blinds"].t()!=crow::json::type::List) {
+      return tl::make_unexpected(eError::JSON_WRONG_VALUE_TYPE);
+    }
+
+    for (auto item : json["blinds"]) {
+      auto b = Blind::from_json(item);
+      if (!b.has_value()) {
+        return tl::make_unexpected(b.error());
+      } else {
+        r.blinds.push_back(b.value());
+      }
+    }
+    return r;
+  }
+}
+
+crow::json::wvalue ResponseMint::to_json() const {
+  crow::json::wvalue r = Response::to_json();
+  TO_JSON_ARRAY(blind_signatures);
+  r["type"] = "response mint";
+  return r;
+}
+
+crow::json::wvalue Coin::Payload::to_json() const {
+  crow::json::wvalue r;
+  TO_JSON(cdd_location);
+  TO_JSON(denomination);
+  BIGINT_TO_JSON(issuer_id);
+  BIGINT_TO_JSON(mint_key_id);
+  TO_JSON(protocol_version);
+  BIGINT_TO_JSON(serial);
+
+  r["type"] = "payload";
+  return r;
+}
+
+crow::json::wvalue Coin::to_json() const {
+  crow::json::wvalue r;
+  TO_JSON_JSON(payload);
+  TO_JSON(signature);
+  r["type"] = "coin";
+  return r;
+}
+
+tl::expected<Coin::Payload, eError>
+Coin::Payload::from_json(const crow::json::rvalue &json) {
+  if (!(json.has("cdd_location") && json.has("denomination") &&
+        json.has("issuer_id") && json.has("mint_key_id") &&
+        json.has("protocol_version") && json.has("serial") &&
+        json.has("type"))) {
+    return tl::make_unexpected(eError::JSON_ERROR);
+  } else if (json["type"] != "payload") {
+    return tl::make_unexpected(eError::JSON_ERROR);
+  } else {
+    Coin::Payload payload;
+    payload.cdd_location = json["cdd_location"].s();
+    payload.denomination = json["denomination"].u();
+    auto id = BigInt::from_string(json["issuer_id"].s());
+    if (!id)
+      tl::make_unexpected(eError::JSON_PARSE_ERROR);
+    payload.issuer_id    = *id;
+
+    id = BigInt::from_string(json["mint_key_id"].s());
+    if (!id)
+      tl::make_unexpected(eError::JSON_PARSE_ERROR);
+    payload.mint_key_id  = *id;
+    payload.protocol_version = json["protocol_version"].s();
+    id = BigInt::from_string(json["serial"].s());
+    if (!id)
+      tl::make_unexpected(eError::JSON_PARSE_ERROR);
+    payload.serial      = *id;
+    return payload;
+  }
+}
+
+tl::expected<Coin, eError> Coin::from_json(const crow::json::rvalue &json) {
+  if (!(json.has("type") && json.has("payload") && json.has("signature"))) {
+    return tl::make_unexpected(eError::JSON_ERROR);
+  } else if (json["type"] != "coin") {
+    return tl::make_unexpected(eError::JSON_ERROR);
+  } else {
+    auto pl = Payload::from_json(json["payload"]);
+    if (!pl.has_value()) {
+      return tl::make_unexpected(pl.error());
+    } else {
+      Coin c;
+      c.payload = pl.value();
+      c.signature = json["signature"].s();
+      return c;
+    }
+  }
+}
+
+crow::json::wvalue CoinStack::to_json() const {
+  crow::json::wvalue r;
+  TO_JSON_ARRAY(coins);
+  TO_JSON(subject);
+  r["type"] = "coinstack";
+  return r;
+}
+
+tl::expected<RequestRenew, eError>
+RequestRenew::from_string(const std::string &str) {
+  auto json = crow::json::load(str);
+
+  if (!json) {
+    return tl::make_unexpected(eError::JSON_PARSE_ERROR);
+  } else if (!(json.has("blinds") && json.has("coins") &&
+               json.has("transaction_reference") &&
+               json.has("message_reference") && json.has("type"))) {
+    return tl::make_unexpected(eError::JSON_MISSING_KEY);
+  } else if (json["type"] != "request renew") {
+    return tl::make_unexpected(eError::JSON_WRONG_REQUEST_TYPE);
+  } else if ((json["coins"].t() != crow::json::type::List) ||
+             (json["blinds"].t() != crow::json::type::List)) {
+    return tl::make_unexpected(eError::JSON_WRONG_VALUE_TYPE);
+  } else {
+    RequestRenew r;
+
+    for (auto item : json["coins"]) {
+      auto coin = Coin::from_json(item);
+      if (!coin.has_value()) {
+        return tl::make_unexpected(coin.error());
+      } else {
+        r.coins.push_back(coin.value());
+      }
+    }
+
+    for (auto item : json["blinds"]) {
+      auto blind = Blind::from_json(item);
+      if (!blind.has_value()) {
+        return tl::make_unexpected(blind.error());
+      } else {
+        r.blinds.push_back(blind.value());
+      }
+    }
+
+    r.message_reference = json["message_reference"].u();
+    r.transaction_reference = json["transaction_reference"].s();
+    return r;
+  }
+}
+
+crow::json::wvalue ResponseDelay::to_json() const {
+  crow::json::wvalue r = Response::to_json();
+  r["type"] = "response delay";
+  return r;
+}
+
+tl::expected<RequestResume, eError>
+RequestResume::from_string(const std::string &str) {
+  auto json = crow::json::load(str);
+  if (!json) {
+    return tl::make_unexpected(eError::JSON_PARSE_ERROR);
+  } else if (!(json.has("transaction_reference") &&
+               json.has("message_reference") && json.has("type"))) {
+    return tl::make_unexpected(eError::JSON_MISSING_KEY);
+  } else if (json["type"] != "request resume") {
+    return tl::make_unexpected(eError::JSON_WRONG_REQUEST_TYPE);
+  } else {
+    RequestResume r;
+    r.message_reference = json["message_reference"].u();
+    auto tr = BigInt::from_string(json["transaction_reference"].s());
+    if (!tr)
+      return tl::make_unexpected(eError::JSON_PARSE_ERROR);
+    r.transaction_reference = *tr;
+    return r;
+  }
+}
+
+tl::expected<RequestRedeem, eError>
+RequestRedeem::from_string(const std::string &str) {
+  //  "type":
+  auto json = crow::json::load(str);
+  if (!json) {
+    return tl::make_unexpected(eError::JSON_PARSE_ERROR);
+  } else if (!(json.has("coins") && json.has("message_reference") &&
+               json.has("type"))) {
+    return tl::make_unexpected(eError::JSON_MISSING_KEY);
+  } else if (json["type"] != "request redeem") {
+    return tl::make_unexpected(eError::JSON_WRONG_REQUEST_TYPE);
+  } else {
+    RequestRedeem r;
+    r.message_reference = json["message_reference"].u();
+    if (json["coins"].t() != crow::json::type::List) {
+      return tl::make_unexpected(eError::JSON_WRONG_VALUE_TYPE);
+    }
+
+    for (auto item : json["coins"]) {
+      auto coin = Coin::from_json(item);
+      if (!coin.has_value()) {
+        return tl::make_unexpected(coin.error());
+      } else {
+        r.coins.push_back(coin.value());
+      }
+    }
+    return r;
+  }
+}
+
+crow::json::wvalue ResponseRedeem::to_json() const {
+  crow::json::wvalue r = Response::to_json();
+  r["type"] = "response redeem";
+  return r;
+}

src/model.cpp

@@ -1,479 +1,9 @@
 #include "model.hpp"
-#include "crow/json.h"
 #include "tl/expected.hpp"
 
-#define TO_JSON(name) r[#name]=name
-#define BIGINT_TO_JSON(name) r[#name]=name.to_string()
-#define TO_JSON_JSON(name) r[#name]=name.to_json()
-#define TO_JSON_ARRAY(name) r[#name]=list_to_json(name)
-
-template <class T>
-crow::json::wvalue list_to_json(const std::vector<T> &array) {
-  crow::json::wvalue::list l;
-  for (auto item : array)
-    l.push_back(item.to_json());
-  return crow::json::wvalue(l);
-}
-
-crow::json::wvalue list_to_json(const std::vector<unsigned int> &array) {
-  crow::json::wvalue::list l;
-  for (auto item : array)
-    l.push_back(item);
-  return crow::json::wvalue(l);
-}
-
-crow::json::wvalue PublicKey::to_json() const {
-  crow::json::wvalue r;
-  BIGINT_TO_JSON(modulus);
-  BIGINT_TO_JSON(public_exponent);
-  r["type"]="rsa public key";
-  return r;
-}
-
-crow::json::wvalue WeightedUrl::to_json() const {
-  crow::json::wvalue::list l;
-  crow::json::wvalue w(weight);
-
-  l.push_back(w);
-  l.push_back(url);
-  return l;
-}
-
-crow::json::wvalue CDD::to_json() const {
-
-  crow::json::wvalue r;
-  TO_JSON(additional_info);
-  TO_JSON(cdd_expiry_date);
-  TO_JSON(cdd_location);
-  TO_JSON(cdd_serial);
-  TO_JSON(cdd_signing_date);
-  TO_JSON(currency_divisor);
-  TO_JSON(currency_name);
-  TO_JSON_ARRAY(denominations);
-  BIGINT_TO_JSON(id);
-  TO_JSON_ARRAY(info_service);
-  TO_JSON(issuer_cipher_suite);
-  TO_JSON_JSON(issuer_public_master_key);
-  TO_JSON_ARRAY(mint_service);
-  TO_JSON(protocol_version);
-  TO_JSON_ARRAY(redeem_service);
-  TO_JSON_ARRAY(renew_service);
-
-  r["type"] = "cdd";
-  return r;
-}
-
-crow::json::wvalue CDDC::to_json() const {
-  crow::json::wvalue r;
-  TO_JSON_JSON(cdd);
-  TO_JSON(signature);
-  r["type"] = "cdd certificate";
-  return r;
-}
-
-crow::json::wvalue MintKey::to_json() const {
-  crow::json::wvalue r;
-
-  TO_JSON(cdd_serial);
-  TO_JSON(coins_expiry_date);
-  TO_JSON(denomination);
-  BIGINT_TO_JSON(id);
-  BIGINT_TO_JSON(issuer_id);
-  TO_JSON_JSON(public_mint_key);
-
-  TO_JSON(sign_coins_not_after);
-  TO_JSON(sign_coins_not_before);
-
-  r["type"] = "mint key";
-  return r;
-}
-
-crow::json::wvalue MintKeyCert::to_json() const {
-  crow::json::wvalue r;
-  TO_JSON_JSON(mint_key);
-  TO_JSON(signature);
-  r["type"] = "mint key certificate";
-  return r;
-}
-
-crow::json::wvalue Response::to_json() const {
-  crow::json::wvalue r;
-  TO_JSON(message_reference);
-  TO_JSON(status_code);
-  TO_JSON(status_description);
-  return r;
-}
-
-crow::json::wvalue ResponseCDDCSerial::to_json() const {
-  crow::json::wvalue r = Response::to_json();
-  TO_JSON(cdd_serial);
-
-  r["type"] = "response cdd serial";
-  return r;
-}
-
-tl::expected<RequestCDDCSerial, eError>
-RequestCDDCSerial::from_string(const std::string &str) {
-  auto json = crow::json::load(str);
-  if (!json) {
-    return tl::make_unexpected(eError::JSON_PARSE_ERROR);
-  } else if (!json.has("type") || !json.has("message_reference")) {
-    return tl::make_unexpected(eError::JSON_ERROR);
-  } else if (json["type"] != "request cdd serial") {
-    return tl::make_unexpected(eError::JSON_ERROR);
-  } else {
-    RequestCDDCSerial r;
-    r.message_reference = json["message_reference"].u();
-    return r;
-  }
-}
-
-crow::json::wvalue ResponseCDDC::to_json() const {
-  crow::json::wvalue r = Response::to_json();
-  TO_JSON_JSON(cddc);
-  r["type"] = "response cdd serial";
-  return r;
-}
-
-tl::expected<RequestCDDC, eError>
-RequestCDDC::from_string(const std::string &str) {
-  auto json = crow::json::load(str);
-  if (!json) {
-    return tl::make_unexpected(eError::JSON_PARSE_ERROR);
-  } else if (!(json.has("type") && json.has("message_reference") &&
-               json.has("cdd_serial"))) {
-    return tl::make_unexpected(eError::JSON_MISSING_KEY);
-  } else if (json["type"] != "request cddc") {
-    return tl::make_unexpected(eError::JSON_WRONG_REQUEST_TYPE);
-  } else {
-    RequestCDDC r;
-    r.cdd_serial = json["cdd_serial"].u();
-    r.message_reference = json["message_reference"].u();
-    return r;
-  }
-}
-
-tl::expected<RequestMKCs, eError>
-RequestMKCs::from_string(const std::string &str) {
-  auto json = crow::json::load(str);
-  if (!json) {
-    return tl::make_unexpected(eError::JSON_PARSE_ERROR);
-  } else if (!(json.has("denominations") && json.has("message_reference") &&
-               json.has("mint_key_ids") && json.has("type"))) {
-    return tl::make_unexpected(eError::JSON_MISSING_KEY);
-  } else if (json["type"] != "request mint key certificates") {
-    return tl::make_unexpected(eError::JSON_WRONG_REQUEST_TYPE);
-  } else {
-    RequestMKCs r;
-    r.message_reference = json["message_reference"].u();
-
-    auto denominations = json["denominations"];
-    if (denominations.t() != crow::json::type::List) {
-      return tl::make_unexpected(eError::JSON_WRONG_REQUEST_TYPE);
-    } else {
-      for (auto d : denominations.lo()) {
-        r.denominations.push_back(d.u());
-      }
-    }
-    auto mint_key_ids = json["mint_key_ids"];
-    if (mint_key_ids.t() != crow::json::type::List) {
-      return tl::make_unexpected(eError::JSON_WRONG_REQUEST_TYPE);
-    } else {
-      for (auto k: mint_key_ids.lo()) {
-	auto kv = BigInt::from_string(k.s());
-	if (!kv.has_value()) {
-	  return tl::make_unexpected(eError::JSON_PARSE_ERROR);
-	} else {
-	  r.mint_key_ids.push_back(*kv);
-	}
-      }
-    }
-    return r;
-  }
-}
-
-crow::json::wvalue ResponseMKCs::to_json() const {
-  crow::json::wvalue r = Response::to_json();
-  TO_JSON_ARRAY(keys);
-  r["type"] = "response mint key certificates";
-  return r;
-}
-
-crow::json::wvalue Blind::to_json() const {
-  crow::json::wvalue r;
-  BIGINT_TO_JSON(blinded_payload_hash);
-  BIGINT_TO_JSON(mint_key_id);
-  TO_JSON(reference);
-  r["type"] = "blinded payload hash";
-  return r;
-}
-
-tl::expected<Blind, eError> Blind::from_json(const crow::json::rvalue &json) {
-  if (!(json.has("type")
-	&& json.has("blinded_payload_hash")
-	&& json.has("mint_key_id")
-	&& json.has("reference"))) {
-    return tl::make_unexpected(eError::JSON_ERROR);
-  } else if (json["type"] != "blinded payload hash") {
-    return tl::make_unexpected(eError::JSON_ERROR);
-  } else {
-    Blind r;
-
-    auto hash = BigInt::from_string(json["blinded_payload_hash"].s());
-    if (!hash) {
-      // std::cout << "invalid hash : " <<  json["blinded_payload_hash"].s()
-      // 		<< std::endl;
-      return tl::make_unexpected(eError::JSON_PARSE_ERROR);
-    }
-    r.blinded_payload_hash = hash.value();
-
-    auto key_id = BigInt::from_string(json["mint_key_id"].s());
-    if (!key_id) {
-      return tl::make_unexpected(eError::JSON_PARSE_ERROR);
-    }
-    r.mint_key_id = key_id.value();
-    r.reference = json["reference"].s();
-    return r;
-  }
-}
-
-crow::json::wvalue BlindSignature::to_json() const {
-  crow::json::wvalue r;
-  BIGINT_TO_JSON(blind_signature);
-  TO_JSON(reference);
-  r["type"] = "blind signature";
-  return r;
-}
-
-tl::expected<RequestMint, eError>
-RequestMint::from_string(const std::string &str) {
-  std::vector<Blind> blinds;
-  //  "type": "request mint"
-  auto json = crow::json::load(str);
-  if (!json) {
-    return tl::make_unexpected(eError::JSON_PARSE_ERROR);
-  } else if (!(json.has("type") && json.has("message_reference") &&
-               json.has("transaction_reference") && json.has("blinds"))) {
-    return tl::make_unexpected(eError::JSON_ERROR);
-  } else if (json["type"] != "request mint") {
-    return tl::make_unexpected(eError::JSON_ERROR);
-  } else {
-    RequestMint r;
-    r.message_reference= json["message_reference"].u();
-    auto tr = BigInt::from_string(json["transaction_reference"].s());
-    if (!tr)
-      return tl::make_unexpected(eError::JSON_PARSE_ERROR);
-      
-    r.transaction_reference = *tr;
-    if (json["blinds"].t()!=crow::json::type::List) {
-      return tl::make_unexpected(eError::JSON_WRONG_VALUE_TYPE);
-    }
-
-    for (auto item : json["blinds"]) {
-      auto b = Blind::from_json(item);
-      if (!b.has_value()) {
-        return tl::make_unexpected(b.error());
-      } else {
-        r.blinds.push_back(b.value());
-      }
-    }
-    return r;
-  }
-}
-
-crow::json::wvalue ResponseMint::to_json() const {
-  crow::json::wvalue r = Response::to_json();
-  TO_JSON_ARRAY(blind_signatures);
-  r["type"] = "response mint";
-  return r;
-}
-
-crow::json::wvalue Coin::Payload::to_json() const {
-  crow::json::wvalue r;
-  TO_JSON(cdd_location);
-  TO_JSON(denomination);
-  BIGINT_TO_JSON(issuer_id);
-  BIGINT_TO_JSON(mint_key_id);
-  TO_JSON(protocol_version);
-  BIGINT_TO_JSON(serial);
-
-  r["type"] = "payload";
-  return r;
-}
-
-crow::json::wvalue Coin::to_json() const {
-  crow::json::wvalue r;
-  TO_JSON_JSON(payload);
-  TO_JSON(signature);
-  r["type"] = "coin";
-  return r;
-}
-
-tl::expected<Coin::Payload, eError>
-Coin::Payload::from_json(const crow::json::rvalue &json) {
-  if (!(json.has("cdd_location") && json.has("denomination") &&
-        json.has("issuer_id") && json.has("mint_key_id") &&
-        json.has("protocol_version") && json.has("serial") &&
-        json.has("type"))) {
-    return tl::make_unexpected(eError::JSON_ERROR);
-  } else if (json["type"] != "payload") {
-    return tl::make_unexpected(eError::JSON_ERROR);
-  } else {
-    Coin::Payload payload;
-    payload.cdd_location = json["cdd_location"].s();
-    payload.denomination = json["denomination"].u();
-    auto id = BigInt::from_string(json["issuer_id"].s());
-    if (!id)
-      tl::make_unexpected(eError::JSON_PARSE_ERROR);
-    payload.issuer_id    = *id;
-
-    id = BigInt::from_string(json["mint_key_id"].s());
-    if (!id)
-      tl::make_unexpected(eError::JSON_PARSE_ERROR);
-    payload.mint_key_id  = *id;
-    payload.protocol_version = json["protocol_version"].s();
-    id = BigInt::from_string(json["serial"].s());
-    if (!id)
-      tl::make_unexpected(eError::JSON_PARSE_ERROR);
-    payload.serial      = *id;
-    return payload;
-  }
-}
-
-tl::expected<Coin, eError> Coin::from_json(const crow::json::rvalue &json) {
-  if (!(json.has("type") && json.has("payload") && json.has("signature"))) {
-    return tl::make_unexpected(eError::JSON_ERROR);
-  } else if (json["type"] != "coin") {
-    return tl::make_unexpected(eError::JSON_ERROR);
-  } else {
-    auto pl = Payload::from_json(json["payload"]);
-    if (!pl.has_value()) {
-      return tl::make_unexpected(pl.error());
-    } else {
-      Coin c;
-      c.payload = pl.value();
-      c.signature = json["signature"].s();
-      return c;
-    }
-  }
-}
-
-crow::json::wvalue CoinStack::to_json() const {
-  crow::json::wvalue r;
-  TO_JSON_ARRAY(coins);
-  TO_JSON(subject);
-  r["type"] = "coinstack";
-  return r;
-}
-
-tl::expected<RequestRenew, eError>
-RequestRenew::from_string(const std::string &str) {
-  auto json = crow::json::load(str);
-
-  if (!json) {
-    return tl::make_unexpected(eError::JSON_PARSE_ERROR);
-  } else if (!(json.has("blinds") && json.has("coins") &&
-               json.has("transaction_reference") &&
-               json.has("message_reference") && json.has("type"))) {
-    return tl::make_unexpected(eError::JSON_MISSING_KEY);
-  } else if (json["type"] != "request renew") {
-    return tl::make_unexpected(eError::JSON_WRONG_REQUEST_TYPE);
-  } else if ((json["coins"].t() != crow::json::type::List) ||
-             (json["blinds"].t() != crow::json::type::List)) {
-    return tl::make_unexpected(eError::JSON_WRONG_VALUE_TYPE);
-  } else {
-    RequestRenew r;
-
-    for (auto item : json["coins"]) {
-      auto coin = Coin::from_json(item);
-      if (!coin.has_value()) {
-        return tl::make_unexpected(coin.error());
-      } else {
-        r.coins.push_back(coin.value());
-      }
-    }
-
-    for (auto item : json["blinds"]) {
-      auto blind = Blind::from_json(item);
-      if (!blind.has_value()) {
-        return tl::make_unexpected(blind.error());
-      } else {
-        r.blinds.push_back(blind.value());
-      }
-    }
-
-    r.message_reference = json["message_reference"].u();
-    r.transaction_reference = json["transaction_reference"].s();
-    return r;
-  }
-}
-
-crow::json::wvalue ResponseDelay::to_json() const {
-  crow::json::wvalue r = Response::to_json();
-  r["type"] = "response delay";
-  return r;
-}
-
-tl::expected<RequestResume, eError>
-RequestResume::from_string(const std::string &str) {
-  auto json = crow::json::load(str);
-  if (!json) {
-    return tl::make_unexpected(eError::JSON_PARSE_ERROR);
-  } else if (!(json.has("transaction_reference") &&
-               json.has("message_reference") && json.has("type"))) {
-    return tl::make_unexpected(eError::JSON_MISSING_KEY);
-  } else if (json["type"] != "request resume") {
-    return tl::make_unexpected(eError::JSON_WRONG_REQUEST_TYPE);
-  } else {
-    RequestResume r;
-    r.message_reference = json["message_reference"].u();
-    auto tr = BigInt::from_string(json["transaction_reference"].s());
-    if (!tr)
-      return tl::make_unexpected(eError::JSON_PARSE_ERROR);
-    r.transaction_reference = *tr;
-    return r;
-  }
-}
-
-tl::expected<RequestRedeem, eError>
-RequestRedeem::from_string(const std::string &str) {
-  //  "type":
-  auto json = crow::json::load(str);
-  if (!json) {
-    return tl::make_unexpected(eError::JSON_PARSE_ERROR);
-  } else if (!(json.has("coins") && json.has("message_reference") &&
-               json.has("type"))) {
-    return tl::make_unexpected(eError::JSON_MISSING_KEY);
-  } else if (json["type"] != "request redeem") {
-    return tl::make_unexpected(eError::JSON_WRONG_REQUEST_TYPE);
-  } else {
-    RequestRedeem r;
-    r.message_reference = json["message_reference"].u();
-    if (json["coins"].t() != crow::json::type::List) {
-      return tl::make_unexpected(eError::JSON_WRONG_VALUE_TYPE);
-    }
-
-    for (auto item : json["coins"]) {
-      auto coin = Coin::from_json(item);
-      if (!coin.has_value()) {
-        return tl::make_unexpected(coin.error());
-      } else {
-        r.coins.push_back(coin.value());
-      }
-    }
-    return r;
-  }
-}
-
-crow::json::wvalue ResponseRedeem::to_json() const {
-  crow::json::wvalue r = Response::to_json();
-  r["type"] = "response redeem";
-  return r;
-}
-
 using std::cout;
 using std::endl;
-
+#define UNUSED(s) /* s */
 /** this is for now our sample model */
 class DefaultModel : public Model {
 public:
@@ -489,8 +19,10 @@ public:
     return &m_cddc;
   }
 
-  std::vector<BlindSignature> mint(const std::string& transaction_reference,
+  std::vector<BlindSignature>
-                                   const std::vector<Blind> &blinds) override {
+  mint(const std::string& UNUSED(transaction_reference),
+       const std::vector<Blind> &UNUSED(blinds) ) override
+  {
     std::vector<BlindSignature> res;
     cout << __FUNCTION__ << "("
          << ")" << endl;
@@ -499,13 +31,15 @@ public:
   }
 
   const std::vector<MintKeyCert>
-  getMKCs(const std::vector<unsigned int> &denominations,
+  getMKCs(const std::vector<unsigned int> & UNUSED(denominations),
-          const std::vector<BigInt> &mint_key_ids) override {
+          const std::vector<BigInt> & UNUSED(mint_key_ids) ) override
+  {
     std::vector<MintKeyCert> res;
     cout << __FUNCTION__ << endl;
     return res;
   }
-  bool redeem(const std::vector<Coin> &coins) override {
+
+  bool redeem(const std::vector<Coin> &UNUSED(coins)) override {
     cout << __FUNCTION__ << endl;
     return false;
   }