removed cryptopp, openssl shall be used instead for blinding (but not implemented yet)

.github/FUNDING.yml

@@ -0,0 +1,13 @@
+# These are supported funding model platforms
+
+github: [gittiver] # Replace with up to 4 GitHub Sponsors-enabled usernames e.g., [user1, user2]
+patreon: # Replace with a single Patreon username
+open_collective: # Replace with a single Open Collective username
+ko_fi: # Replace with a single Ko-fi username
+tidelift: # Replace with a single Tidelift platform-name/package-name e.g., npm/babel
+community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry
+liberapay: # Replace with a single Liberapay username
+issuehunt: # Replace with a single IssueHunt username
+otechie: # Replace with a single Otechie username
+lfx_crowdfunding: # Replace with a single LFX Crowdfunding project-name e.g., cloud-foundry
+custom: # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2']

.github/dependabot.yml

@@ -0,0 +1,11 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: "" # See documentation for possible values
+    directory: "/" # Location of package manifests
+    schedule:
+      interval: "weekly"

.github/workflows/cmake.yaml

@@ -1,4 +1,4 @@
-name: CMake
+name: Build and test (cmake based build)
 
 on:
   push:
@@ -19,34 +19,35 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
+        os: [ubuntu-latest,
+             macos-latest,
+             windows-latest]
 
     steps:
     - uses: actions/checkout@v3
     - name: Prepare dependencies
       run:   |
-         if [ "$RUNNER_OS" == "Linux" ]; then
+        if [ "$RUNNER_OS" == "Linux" ]; then
-              sudo apt-get update && \
+             sudo apt-get update && \
-              sudo apt-get install -yq \
+             sudo apt-get install -yq \
-                libboost-system-dev \
+               libasio-dev \
-                libboost-date-time-dev \
+               libssl-dev zlib1g-dev \
-                cmake \
+               cmake graphviz doxygen
-                graphviz doxygen
+        elif [ "$RUNNER_OS" == "Windows" ]; then
-         elif [ "$RUNNER_OS" == "Windows" ]; then
+             VCPKG_DEFAULT_TRIPLET=x64-windows vcpkg install
-              choco install boost-msvc-14.3 graphviz doxygen.install
+        elif [ "$RUNNER_OS" == "macOS" ]; then
-         elif [ "$RUNNER_OS" == "macOS" ]; then
+             brew install asio openssl zlib doxygen graphviz
-              brew install boost graphviz doxygen
+        else
-         else
+             echo "$RUNNER_OS not supported"
-              echo "$RUNNER_OS not supported"
+             exit 1
-              exit 1
+        fi
-         fi
       shell: bash
     - name: Configure CMake
-      run: cmake -B ${{github.workspace}}/build -D CMAKE_BUILD_TYPE=${{env.BUILD_TYPE}} 
+      run: cmake -B build
       shell: bash      
     - name: Build
       # Build your program with the given configuration
-      run: cmake --build ${{github.workspace}}/build --config ${{env.BUILD_TYPE}}
+      run: cmake --build build --config ${{env.BUILD_TYPE}}
       shell: bash      
 
     - name: Test

.github/workflows/doxygen-gh-pages.yml

@@ -1,4 +1,4 @@
-name: Doxygen Github Pages Deploy action
+name: Deploy Doxygen results to Github Pages
 
 on:
   push:

CMakeLists.txt

@@ -1,20 +1,25 @@
-cmake_minimum_required(VERSION 3.1.3)
+cmake_minimum_required(VERSION 3.15.0 FATAL_ERROR)
+
+project(oc-issuer VERSION 0.0.2 LANGUAGES CXX)
 
 enable_language(C)
 enable_language(CXX)
 set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_EXPORT_COMPILE_COMMANDS On)
 
+set(CMAKE_POLICY_DEFAULT_CMP0077 NEW)
 if(POLICY CMP0077)
     cmake_policy(SET CMP0077 NEW)
 endif()
 
 if (MSVC)
-    add_compile_options(/W4 /WX)
+    add_compile_options(/W4)
 else()
     add_compile_options(-Wall -Wextra -pedantic)
 endif()
 
-project(oc-mint VERSION 0.0.1 LANGUAGES CXX)
+
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
 include(FetchContent)
 
@@ -25,11 +30,12 @@ set(CROW_BUILD_EXAMPLES Off)
 set(CROW_BUILD_TOOLS Off)
 set(CROW_BUILD_TESTS Off)
 set(CROW_BUILD_DOCS Off)
+set(CROW_FEATURES "ssl;compression")
 
 # add crow project to the build
 FetchContent_Declare(crow
   		 GIT_REPOSITORY https://github.com/CrowCpp/Crow.git
-		 GIT_TAG v1.0+5
+		 GIT_TAG v1.2.0
 		 )
 
 if(NOT crow_POPULATED)
@@ -46,6 +52,18 @@ if(NOT expected_POPULATED)
   FetchContent_Populate(expected)
 endif(NOT expected_POPULATED)
 
+# add crypt++ (+cmake) library
+#set(CRYPTOPP_BUILD_TESTING Off)
+#set(CRYPTOPP_INSTALL Off)
+
+#if(NOT cryptopp_POPULATED)
+#  FetchContent_Declare(cryptopp
+#    GIT_REPOSITORY https://github.com/abdes/cryptopp-cmake.git
+#    GIT_TAG CRYPTOPP_8_7_0_1)
+#  FetchContent_Populate(cryptopp)
+#  add_subdirectory(${cryptopp_SOURCE_DIR} ${cryptopp_BINARY_DIR})
+#endif(NOT cryptopp_POPULATED)
+
 include(CTest)
 enable_testing()
 
@@ -54,7 +72,7 @@ set(CATCH_INSTALL_EXTRAS Off)
 FetchContent_Declare(
   Catch2
   GIT_REPOSITORY https://github.com/catchorg/Catch2.git
-  GIT_TAG        v3.2.0
+  GIT_TAG        v3.6.0
 )
 
 FetchContent_MakeAvailable(Catch2)
@@ -64,23 +82,30 @@ find_package(Doxygen
              REQUIRED dot
              OPTIONAL_COMPONENTS mscgen dia)
 set(DOXYGEN_HAVE_DOT YES)
-doxygen_add_docs(
+doxygen_add_docs( doc
-    doc
+                  README.md 
-    src
+                  src
-    COMMENT "Generate documentation"
+		  COMMENT "Generate documentation"
 )
 
 # build common library
-set(LIB_SOURCES src/model.cpp src/model.hpp)
+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(oc-mint src/main.cpp)
+add_executable(${PROJECT_NAME} src/main.cpp)
-target_link_libraries(oc-mint PRIVATE oc-mint-lib INTERFACE tl::expected::expected)
+target_link_libraries(${PROJECT_NAME} PRIVATE oc-mint-lib INTERFACE tl::expected::expected)
 
 ## these are unittests that can be run on any platform
-add_executable(tests test/test.cpp)
+add_executable(tests test/test_big_int.cpp
+                     test/test_json_s8n.cpp
+                     test/test_crypto.cpp)
+                     
 target_link_libraries(tests
                       oc-mint-lib
 		      Catch2::Catch2WithMain)

README.md

@@ -1,11 +1,40 @@
-![build](https://github.com/OpenCoin/oc-mint-cpp/actions/workflows/cmake.yaml/badge.svg)
+opencoin-issuer-cpp - a C++ OpenCoin Issuer REST-API implementation {#mainpage}
+=============================================================
 
-# oc mint sample
+![build](https://github.com/OpenCoin/opencoin-issuer-cpp/actions/workflows/cmake.yaml/badge.svg)
+[![Documentation](https://github.com/OpenCoin/opencoin-issuer-cpp/actions/workflows/doxygen-gh-pages.yml/badge.svg)](https://github.com/OpenCoin/opencoin-issuer-cpp/actions/workflows/doxygen-gh-pages.yml)
 
-this is a C++ implementation of the opencoin protocol 
+# opencoin issuer
-as mapping to some kind of REST interface 
 
-actually it is a work in progress.
+this is a C++ implementation of the [opencoin protocol](https://opencoin.org/OpenCoin.html)
+done as mapping to some kind of REST interface.
+
+As all issuer related interactions of the protocol follows a request/response mechanism we are able to map all of them to Http-Requests.
+
+We decided to use POST-Requests in all cases, 
+as the protocol uses JSON-formatted messages for requests.
+
+The following table gives an overview of the mapping of requests to URLs:
+
+| Request           | URL          | Response                      | C++ Interface Method                               |
+|:------------------|:-------------|:------------------------------|:---------------------------------------------------|
+| RequestCDDCSerial | /cddc/serial | ResponseCDDCSerial            | cdd.cdd_serial of Model::get_current_cddc() |
+| RequestCDDC       | /cddc        | ResponseCDDC                  | Model::get_current_cddc()                            |
+| RequestMKCs       | /mkcs        | ResponseMKCs                  | Model::getMKCs                                     |
+| RequestMint       | /mint        | ResponseMint                  | Model::mint                                        |
+| RequestRenew      | /renew       | ResponseMint or ResponseDelay | ?                                                  |
+| RequestResume     | /resume      | ResponseMint or ResponseDelay | ?                                                  |
+| RequestRedeem     | /redeem      | ResponseRedeem                | Model::redeem                                      |
+
+actually the implementation is a work in progress.
+
+## TODO
+
+- [ ] select crypto library
+   + https://en.wikipedia.org/wiki/Comparison_of_cryptography_libraries
++ [ ] blinding utilizing crypto++
++ [ ] integrate session and login to make transactions account based
++ [ ] bookkeeping for accounts
 
 ## Protocol Questions
 
@@ -14,11 +43,6 @@ or also the key?
 + the weighted URL as array has a different js encoding as other elements
 + Clarify PSS usage (see https://crypto.stackexchange.com/questions/12707/usability-of-padding-scheme-in-blinded-rsa-signature) 
 
-## TODO
-
-+ [ ] bigint type for big integers encoded as string
-+ [ ] blinding utilizing crypto++
-
 ### Blinding Notes
 
 https://stackoverflow.com/questions/47860570/how-to-create-and-verify-blind-rsa-signatures-with-crypto
@@ -27,3 +51,8 @@ https://crypto.stackexchange.com/questions/12707/usability-of-padding-scheme-in-
 
 https://crypto.stackexchange.com/questions/54085/is-there-a-standard-padding-format-for-rsa-blind-signatures/60728#60728
 https://crypto.stackexchange.com/questions/5626/rsa-blind-signatures-in-practice
+
+<https://cfrg.github.io/draft-irtf-cfrg-blind-signatures/draft-irtf-cfrg-rsa-blind-signatures.html>
+
+alternative implementation using openssl
+https://github.com/jedisct1/blind-rsa-signatures

src/big_int.cpp

@@ -0,0 +1,104 @@
+#include "big_int.hpp"
+#include "tl/expected.hpp"
+#include <charconv>
+
+#pragma clang diagnostic push
+#pragma ide diagnostic ignored "clion-misra-cpp2008-6-4-5"
+inline uint8_t hex(char c) {
+  switch(c) {
+    case '0': return 0U;
+    case '1': return 1U;
+    case '2': return 2U;
+    case '3': return 3U;
+    case '4': return 4U;
+    case '5': return 5U;
+    case '6': return 6U;
+    case '7': return 7U;
+    case '8': return 8U;
+    case '9': return 9U;
+    case 'a': return 10U;
+    case 'b': return 11U;
+    case 'c': return 12U;
+    case 'd': return 13U;
+    case 'e': return 14U;
+    case 'f': return 15U;
+    case 'A': return 10U;
+    case 'B': return 11U;
+    case 'C': return 12U;
+    case 'D': return 13U;
+    case 'E': return 14U;
+    case 'F': return 15U;
+    default:
+      return 0xffU;
+  }
+}
+#pragma clang diagnostic pop
+  
+tl::expected<BigInt,BigInt::eError>
+BigInt::from_string(const std::string& str) {
+  BigInt b;
+
+  uint8_t hval=0U;
+  uint8_t nibble;
+  size_t i = str.size()+1U;
+
+  for(auto c : str) {
+    nibble = hex(c);
+    if (nibble ==0xFFU) {
+      return tl::make_unexpected(eError::PARSE_ERROR);
+    }
+    if ( i%2U != 0U ) {
+      hval = nibble << 4U;
+    } else {
+      hval |= nibble;
+      b.data[256U - (i/2U)]= hval;
+      hval = 0U;
+    }
+    i--;
+  }
+
+  return b;
+}
+
+BigInt BigInt::from_int(uint64_t value)
+{
+  BigInt b;
+  b.data[248U]=static_cast<uint8_t>(value >> 56 & 0xffU);
+  b.data[249U]=static_cast<uint8_t>(value >> 48 & 0xffU);
+  b.data[250U]=static_cast<uint8_t>(value >> 40U & 0xffU);
+  b.data[251U]=static_cast<uint8_t>(value >> 32U & 0xffU);
+  b.data[252U]=static_cast<uint8_t>(value >> 24U & 0xffU);
+  b.data[253U]=static_cast<uint8_t>(value >> 16U & 0xffU);
+  b.data[254U]=static_cast<uint8_t>(value >> 8U & 0xffU);
+  b.data[255U]=static_cast<uint8_t>(value & 0xffU);
+  return b;
+}
+
+constexpr char hex_char [] = "0123456789abcdef";
+std::string BigInt::to_string() const
+{
+  std::string s;
+  uint8_t b;
+  uint8_t first_digit = 0U;
+  for (size_t i = 0U; i<256U;i++) {
+    b = data[i];
+    if (first_digit==0U) {
+      if (b==0U) {
+	      continue;
+      } else if (b>0xfU) {
+	      s.push_back(hex_char[b >> 4]);
+      } else {
+        /* nothing to do here */
+      }
+      s.push_back(hex_char[b & 0xf]);
+      first_digit = b;
+    } else {
+      s.push_back(hex_char[b >> 4]);
+      s.push_back(hex_char[b & 0xf]);
+    }
+  }
+  return s;
+}
+
+bool operator == (const BigInt& rhs, const BigInt& lhs)
+{ return rhs.data == lhs.data; }

src/big_int.hpp

@@ -0,0 +1,27 @@
+#ifndef OC_ISSUER_BIG_INT_HPP
+#define OC_ISSUER_BIG_INT_HPP
+
+#include <string>
+#include <array>
+
+#include "tl/expected.hpp"
+
+struct BigInt {
+
+  BigInt() : data() {}
+  virtual ~BigInt() = default;
+
+  enum class eError : uint8_t { PARSE_ERROR };
+  static tl::expected<BigInt, eError> from_string(const std::string &str);
+
+  static BigInt from_int(uint64_t value);
+  [[nodiscard]] std::string to_string() const;
+
+  friend bool operator == (const BigInt& rhs, const BigInt& lhs);
+private:
+  std::array<uint8_t,256U> data;
+};
+
+bool operator==(const BigInt &rhs, const BigInt &lhs);
+
+#endif // #ifndef #ifndef OC_ISSUER_BIG_INT_HPP

src/json_serialisation.cpp

@@ -0,0 +1,474 @@
+#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 (const auto& item : array) {
+    l.push_back(item.to_json());
+  }
+  return {l};
+}
+
+crow::json::wvalue list_to_json(const std::vector<unsigned int> &array) {
+  crow::json::wvalue::list l;
+  for (auto item : array) {
+    l.emplace_back(item);
+  }
+    return {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.emplace_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 (const 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 (const 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 (const 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 (const 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 (const 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 (const 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/main.cpp

@@ -1,22 +1,22 @@
 #include "crow.h"
 #include "crow/common.h"
-#include "crow/http_parser_merged.h"
 #include "crow/http_response.h"
 #include "model.hpp"
 
 int main() {
   crow::SimpleApp app;
-  std::shared_ptr<Model> model = Model::getModel("simple");
+  std::shared_ptr<Model> model = Model::get_model("simple");
 
   CROW_ROUTE(app, "/cddc")
-      .methods(crow::HTTPMethod::POST)([&model](const crow::request &req) {
+      .methods(crow::HTTPMethod::POST)
+    ([&model](const crow::request &req) {
         auto req_cddc = RequestCDDC::from_string(req.body);
         if (!req_cddc) {
           return crow::response(crow::status::BAD_REQUEST);
         } else {
           ResponseCDDC res;
           res.message_reference = req_cddc->message_reference;
-          auto cddc = model->getCDDC(req_cddc->cdd_serial);
+          auto cddc = model->get_cddc(req_cddc->cdd_serial);
           if (!cddc) {
             res.status_code = crow::status::NOT_FOUND;
           } else {
@@ -29,14 +29,14 @@ int main() {
 
   CROW_ROUTE(app, "/cddc/serial")
       .methods(crow::HTTPMethod::POST)([&model](const crow::request &request) {
-        auto req = RequestCDDSerial::from_string(request.body);
+        auto req = RequestCDDCSerial::from_string(request.body);
         if (!req) {
           return crow::response(crow::status::BAD_REQUEST);
         } else {
-          ResponseCDDSerial res;
+          ResponseCDDCSerial res;
           res.message_reference = req->message_reference;
 
-          auto cddc = model->getCurrentCDDC();
+          auto cddc = model->get_current_cddc();
           if (!cddc) {
             res.status_code = crow::status::NOT_FOUND;
           } else {
@@ -47,8 +47,8 @@ int main() {
         }
       });
 
-  CROW_ROUTE(app, "/mkcs")
+  CROW_ROUTE(app, "/mkcs").methods(crow::HTTPMethod::POST)
-      .methods(crow::HTTPMethod::POST)([&model](const crow::request &request) {
+    ([&model](const crow::request &request) {
         auto req = RequestMKCs::from_string(request.body);
         if (!req) {
           return crow::response(crow::status::BAD_REQUEST);
@@ -61,8 +61,8 @@ int main() {
         }
       });
 
-  CROW_ROUTE(app, "/mint")
+  CROW_ROUTE(app, "/mint").methods(crow::HTTPMethod::POST)
-      .methods(crow::HTTPMethod::POST)([&model](const crow::request &request) {
+    ([&model](const crow::request &request) {
         auto req = RequestMint::from_string(request.body);
         if (!req) {
           return crow::response(crow::status::BAD_REQUEST);
@@ -70,7 +70,9 @@ int main() {
           ResponseMint res;
           res.message_reference = req->message_reference;
 
-          auto minted = model->mint(req->transaction_reference, req->blinds);
+          /// \todo change argument transaction_reference to bigint
+          auto minted =
+              model->mint(req->transaction_reference.to_string(), req->blinds);
 
           res.blind_signatures = minted;
           res.status_code = crow::status::OK;

src/model.cpp

@@ -1,484 +1,56 @@
 #include "model.hpp"
-#include "crow/json.h"
+#include "tl/expected.hpp"
-
-#define TO_JSON(name) r[#name] = name
-#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;
-  TO_JSON(modulus);
-  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);
-  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);
-  TO_JSON(id);
-  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 ResponseCDDSerial::to_json() const {
-  crow::json::wvalue r = Response::to_json();
-  TO_JSON(cdd_serial);
-
-  r["type"] = "response cdd serial";
-  return r;
-}
-
-tl::expected<RequestCDDSerial, eError>
-RequestCDDSerial::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 {
-    RequestCDDSerial 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()) {
-        r.mint_key_ids.push_back(k.u());
-      }
-    }
-    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;
-  TO_JSON(blinded_payload_hash);
-  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;
-    r.blinded_payload_hash = json["blinded_payload_hash"].s();
-    r.mint_key_id = json["mint_key_id"].s();
-    r.reference = json["reference"].s();
-    return r;
-  }
-}
-
-crow::json::wvalue BlindSignature::to_json() const {
-  crow::json::wvalue r;
-  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();
-    r.transaction_reference = json["transaction_reference"].s();
-    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);
-  TO_JSON(issuer_id);
-  TO_JSON(mint_key_id);
-  TO_JSON(protocol_version);
-  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();
-    payload.issuer_id = json["issuer_id"].s();
-    payload.mint_key_id = json["mint_key_id"].s();
-    payload.protocol_version = json["protocol_version"].s();
-    payload.serial = json["serial"].s();
-    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();
-    r.transaction_reference = json["transaction_reference"].s();
-    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:
-  DefaultModel() {}
+    DefaultModel() = default;
-  tl::expected<CDDC *, bool> getCDDC(unsigned int cdd_serial) override {
-    cout << __FUNCTION__ << "(" << cdd_serial << ")" << endl;
-    return &m_cddc;
-  };
 
-  tl::expected<CDDC *, bool> getCurrentCDDC() override {
+    tl::expected<CDDC *, bool> get_cddc(unsigned int cdd_serial) override {
-    cout << __FUNCTION__ << "()" << endl;
+        cout << __FUNCTION__ << "(" << cdd_serial << ")" << endl; // NOLINT(clion-misra-cpp2008-5-2-12)
+        return &m_cddc;
+    };
 
-    return &m_cddc;
+    tl::expected<CDDC *, bool> get_current_cddc() override {
-  }
+        cout << __FUNCTION__ << "()" << endl;
 
-  std::vector<BlindSignature> mint(const std::string &transaction_reference,
+        return &m_cddc;
-                                   const std::vector<Blind> &blinds) override {
+    }
-    std::vector<BlindSignature> res;
-    cout << __FUNCTION__ << "("
-         << ")" << endl;
 
-    return res;
+    std::vector<BlindSignature>
-  }
+    mint(const std::string & UNUSED(transaction_reference),
+         const std::vector<Blind> &UNUSED(blinds)) override {
+        std::vector<BlindSignature> res;
+        cout << __FUNCTION__ << "("
+             << ")" << endl;
 
-  const std::vector<MintKeyCert>
+        return res;
-  getMKCs(const std::vector<unsigned int> &denominations,
+    }
-          const std::vector<unsigned int> &mint_key_ids) override {
+
-    std::vector<MintKeyCert> res;
+    std::vector<MintKeyCert>
-    cout << __FUNCTION__ << endl;
+    getMKCs(const std::vector<unsigned int> & UNUSED(denominations),
-    return res;
+            const std::vector<BigInt> & UNUSED(mint_key_ids)) override {
-  }
+        std::vector<MintKeyCert> res;
-  bool redeem(const std::vector<Coin> &coins) override {
+        cout << __FUNCTION__ << endl;
-    cout << __FUNCTION__ << endl;
+        return res;
-    return false;
+    }
-  }
+
+    bool redeem(const std::vector<Coin> &UNUSED(coins)) override {
+        cout << __FUNCTION__ << endl;
+        return false;
+    }
 
 private:
-  CDDC m_cddc;
+    CDDC m_cddc;
 };
 
-std::unique_ptr<Model> Model::getModel(const std::string & /*backend_name*/) {
+std::unique_ptr<Model> Model::get_model(const std::string & /*backend_name*/) {
-  cout << __FUNCTION__ << endl;
+    cout << __FUNCTION__ << endl;
-  //:wq
+    //:wq
-  // if (backend_name=="default")
+    // if (backend_name=="default")
-  return std::make_unique<DefaultModel>();
+    return std::make_unique<DefaultModel>();
 }

src/model.hpp

@@ -1,5 +1,5 @@
-#ifndef MODEL_HPP
+#ifndef OC_ISSUER_MODEL_HPP
-#define MODEL_HPP
+#define OC_ISSUER_MODEL_HPP
 
 #include <chrono>
 #include <memory>
@@ -9,76 +9,84 @@
 #include "crow/json.h"
 
 #include "tl/expected.hpp"
+#include "big_int.hpp"
 
 struct PublicKey {
-  std::string modulus; //: "daaa63ddda38c189b8c49020c8276adbe0a695685a...",
+  BigInt modulus; //: "daaa63ddda38c189b8c49020c8276adbe0a695685a...",
-  std::string public_exponent; //: 65537,
+  BigInt public_exponent;//: 65537,
 
-  crow::json::wvalue to_json() const;
+    [[nodiscard]] crow::json::wvalue to_json() const;
 };
 
 struct WeightedUrl {
   uint32_t weight;
   std::string url;
 
-  crow::json::wvalue to_json() const;
+    [[nodiscard]] crow::json::wvalue to_json() const;
 };
 
-/** currency description document */
+/** @brief currency description document 
+ *
+ * this structure describes a currency based on opencoin protocol. 
+ * It can be converted to json to provide the specified currency 
+ * description document. 
+ */
 struct CDD {
 
   std::string additional_info;
-  time_t cdd_expiry_date;              //: 2023-07-22T15:45:53.164685
+  time_t cdd_expiry_date;    /// expiry date of this document (e.g.
-  std::string cdd_location;            //: https://opencent.org,
+                             ///2023-07-22T15:45:53.164685)
-  size_t cdd_serial;                   //: 1,
+  std::string cdd_location;  /// URL of location of this document (e.g
-  time_t cdd_signing_date;             //: 2022-07-22T15:45:53.164685,
+                             ///https://opencent.org)
-  size_t currency_divisor;             //: 100,
+  size_t cdd_serial;         /// serial number of currency description document
-  std::string currency_name;           //: OpenCent,
+  time_t cdd_signing_date;   /// date of signing this document (e.g.
-  std::vector<unsigned> denominations; //: [1, 2, 5],
+                             ///2022-07-22T15:45:53.164685)
-  std::string id; //: 23ed956e629ba35f0002eaf833ea436aea7db5c2,
+  size_t currency_divisor;   /// divisor used for coins of this currency
+  std::string currency_name; /// name of the currency (e.g. OpenCent)
+  std::vector<unsigned>
+      denominations; /// the available denominations of this currency
+  BigInt id;         /// an identity for this currency
+
   std::vector<WeightedUrl> info_service;
-  /* eCipherSuite*/ std::string issuer_cipher_suite; //: RSA-SHA256-PSS-CHAUM82,
+  /* eCipherSuite*/
-  PublicKey
+  std::string issuer_cipher_suite; /// the cipher suite used for this currencey
-      issuer_public_master_key; //: {
+                                   /// (currently only RSA-SHA256-PSS-CHAUM82 
-                                //  modulus:
+                                   ///  is supported)
-                                //  daaa63ddda38c189b8c49020c8276adbe0a695685a...,
+  PublicKey issuer_public_master_key; /// the public key of this currency
-                                // public_exponent: 65537,
-                                // type: rsa public key
-  //},
   std::vector<WeightedUrl> mint_service;
-  std::string protocol_version; //: https://opencoin.org/1.0,
+  std::string protocol_version; // e.g. https://opencoin.org/1.0
   std::vector<WeightedUrl> redeem_service;
   std::vector<WeightedUrl> renew_service;
 
-  crow::json::wvalue to_json() const;
+  [[nodiscard]] crow::json::wvalue to_json() const;
 };
 
 struct CDDC {
   CDD cdd;
   std::string signature;
 
-  crow::json::wvalue to_json() const;
+    [[nodiscard]] crow::json::wvalue to_json() const;
 };
 
 struct MintKey {
   unsigned int cdd_serial;
   std::string coins_expiry_date; //": "2023-10-30T15:45:53.164685",
-  unsigned int denomination;     //": 1,
+  unsigned int denomination; //": 1,
-  std::string id;                // "1ceb977bb531c65f133ab8b0d60862b17369d96",
+  BigInt id;   // "1ceb977bb531c65f133ab8b0d60862b17369d96",
-  std::string issuer_id; //": "23ed956e629ba35f0002eaf833ea436aea7db5c2",
+  BigInt issuer_id; //": "23ed956e629ba35f0002eaf833ea436aea7db5c2",
   PublicKey public_mint_key;
 
   std::string sign_coins_not_after;
   std::string sign_coins_not_before;
   //    "type": "mint key"
-  crow::json::wvalue to_json() const;
+  [[nodiscard]] crow::json::wvalue to_json() const;
 };
 
 struct MintKeyCert {
   MintKey mint_key;
   std::string signature;
 
-  crow::json::wvalue to_json() const;
+    [[nodiscard]] crow::json::wvalue to_json() const;
 };
 
 enum class eError {
@@ -95,20 +103,20 @@ struct Response {
   unsigned int status_code;
   std::string status_description;
 
-  virtual crow::json::wvalue to_json() const;
+    [[nodiscard]] virtual crow::json::wvalue to_json() const=0;
 };
 
-struct RequestCDDSerial {
+struct RequestCDDCSerial {
   unsigned int message_reference; /// Client internal message reference.
                                   /// (Integer)
-  static tl::expected<RequestCDDSerial, eError>
+  static tl::expected<RequestCDDCSerial, eError>
   from_string(const std::string &str);
 };
 
-struct ResponseCDDSerial : Response {
+struct ResponseCDDCSerial : Response {
-  unsigned int cdd_serial;
+  unsigned int cdd_serial{0U};
 
-  crow::json::wvalue to_json() const override;
+    [[nodiscard]] crow::json::wvalue to_json() const override;
 };
 
 struct RequestCDDC {
@@ -121,14 +129,14 @@ struct RequestCDDC {
 struct ResponseCDDC : Response {
   CDDC cddc;
 
-  crow::json::wvalue to_json() const override;
+    [[nodiscard]] crow::json::wvalue to_json() const override;
 };
 
 struct RequestMKCs {
   std::vector<unsigned int> denominations;
   unsigned int message_reference; /// Client internal message reference.
                                   /// (Integer)
-  std::vector<unsigned int> mint_key_ids;
+  std::vector<BigInt> mint_key_ids;
   //  "type": "request mint key certificates"
   static tl::expected<RequestMKCs, eError> from_string(const std::string &str);
 };
@@ -136,27 +144,27 @@ struct RequestMKCs {
 struct ResponseMKCs : Response {
   std::vector<MintKeyCert> keys;
 
-  crow::json::wvalue to_json() const override;
+    [[nodiscard]] crow::json::wvalue to_json() const override;
 };
 
 struct Blind {
-  std::string blinded_payload_hash; // bigint
+  BigInt blinded_payload_hash; //bigint
-  std::string mint_key_id;          // bigint
+  BigInt mint_key_id; //bigint
   std::string reference;
-  crow::json::wvalue to_json() const;
+    [[nodiscard]] crow::json::wvalue to_json() const;
   static tl::expected<Blind, eError> from_json(const crow::json::rvalue &json);
 };
 
 struct BlindSignature {
-  std::string blind_signature;
+  BigInt blind_signature;
   std::string reference;
-  crow::json::wvalue to_json() const;
+    [[nodiscard]] crow::json::wvalue to_json() const;
 };
 
 struct RequestMint {
   unsigned int message_reference; /// Client internal message reference.
                                   /// (Integer)
-  std::string transaction_reference;
+  BigInt transaction_reference; 
   std::vector<Blind> blinds;
   //  "type": "request mint"
   static tl::expected<RequestMint, eError> from_string(const std::string &str);
@@ -165,27 +173,26 @@ struct RequestMint {
 struct ResponseMint : Response {
   std::vector<BlindSignature> blind_signatures;
 
-  crow::json::wvalue to_json() const override;
+    [[nodiscard]] crow::json::wvalue to_json() const override;
 };
 
 struct Coin {
   struct Payload {
     std::string cdd_location;
     unsigned int denomination;
-    std::string issuer_id;
+    BigInt issuer_id;
-    std::string mint_key_id;
+    BigInt mint_key_id;
     std::string protocol_version;
-    std::string serial;
+    BigInt serial;
 
-    crow::json::wvalue to_json() const;
+      [[nodiscard]] crow::json::wvalue to_json() const;
-    static tl::expected<Payload, eError>
+    static tl::expected<Payload,eError> from_json(const crow::json::rvalue& json);
-    from_json(const crow::json::rvalue &json);
   };
 
   Payload payload;
   std::string signature;
 
-  crow::json::wvalue to_json() const;
+    [[nodiscard]] crow::json::wvalue to_json() const;
   static tl::expected<Coin, eError> from_json(const crow::json::rvalue &json);
 };
 
@@ -193,7 +200,7 @@ struct CoinStack {
   std::vector<Coin> coins;
   std::string subject;
   //  "type": "coinstack"
-  crow::json::wvalue to_json() const;
+  [[nodiscard]]  crow::json::wvalue to_json() const;
 };
 
 struct RequestRenew {
@@ -207,13 +214,13 @@ struct RequestRenew {
 };
 
 struct ResponseDelay : Response {
-  crow::json::wvalue to_json() const override;
+    [[nodiscard]] crow::json::wvalue to_json() const override;
 };
 
 struct RequestResume {
   unsigned int message_reference; /// Client internal message reference.
                                   /// (Integer)
-  std::string transaction_reference;
+  BigInt transaction_reference; 
   //  "type": "request resume"
   static tl::expected<RequestResume, eError>
   from_string(const std::string &str);
@@ -229,28 +236,73 @@ struct RequestRedeem {
 };
 
 struct ResponseRedeem : Response {
-  crow::json::wvalue to_json() const override;
+    [[nodiscard]] crow::json::wvalue to_json() const override;
 };
 
 class Model {
 public:
-  virtual ~Model(){};
+  virtual ~Model()=default;
 
-  virtual tl::expected<CDDC *, bool> getCDDC(unsigned int cdd_serial) = 0;
+  /** 
-  virtual tl::expected<CDDC *, bool> getCurrentCDDC() = 0;
+   * return the CurrencyDocumentDescription certifikate for a specific 
+   * serial version number of it.
+   * [see spec](https://opencoin.org/0.4/schemata.html#cddc)
+   * @return returns a pointer to the CDDC if successful, false otherwise
+   */
+  virtual tl::expected<CDDC *, bool> get_cddc(unsigned int cdd_serial) = 0;
 
-  virtual const std::vector<MintKeyCert>
+  /** 
+   * return the CurrencyDocumentDescription certifikate 
+   * [see spec](https://opencoin.org/0.4/schemata.html#cddc)
+   * @return returns a pointer to the CDDC if successful, false otherwise
+   */virtual tl::expected<CDDC *, bool> get_current_cddc() = 0;
+
+  /** 
+   * return the MintKey certificates for a given list of denominations 
+   * and mint key ids
+   *
+   * @param denominations 
+   * @param mint_key_ids 
+   *
+   * @return mint key certificates for given denominations and mint_key_ids
+   */
+  virtual std::vector<MintKeyCert>
   getMKCs(const std::vector<unsigned int> &denominations,
-          const std::vector<unsigned int> &mint_key_ids) = 0;
+          const std::vector<BigInt> &mint_key_ids) = 0;
 
+
+  /** 
+   * returns the vector of blind signatures for a given vector of blinds
+   *
+   * @param transaction_reference reference to a transaction (send from client)
+   * @param blinds the vector of blinds to sign
+   *
+   * @return 
+   */
   virtual std::vector<BlindSignature>
-  mint(const std::string &transaction_reference,
+  mint(std::string const& transaction_reference,
        const std::vector<Blind> &blinds) = 0;
+
+  /** 
+   * redeem valid coins into real money
+   *
+   * @param coins the coins to redeem
+   *
+   * @return true if successful, false on error
+   */
   virtual bool redeem(const std::vector<Coin> &coins) = 0;
 
-  static std::unique_ptr<Model> getModel(const std::string &backend_name);
+  /** 
+   * factory function returning a concrete backend for Opencoin API handling.
+   * based on backend_name a concrete backend will be returned 
+   * or in case of error null.
+   * @param backend_name 
+   *
+   * @return pointer to backend instance or null on invalid backend name
+   */
+  static std::unique_ptr<Model> get_model(const std::string &backend_name);
 
 private:
 };
 
-#endif // #ifndef MODEL_HPP
+#endif // #ifndef OC_ISSUER_MODEL_HPP

test/test_big_int.cpp

@@ -0,0 +1,37 @@
+#include "big_int.hpp"
+#include <catch2/catch_test_macros.hpp>
+
+TEST_CASE("BigInt::from_string", "[big_int]") {
+  const std::string VALID [] = {
+    "1",
+    "12",
+    "123",
+    "1234",
+    "12345",
+    "123456",
+    "120456",
+    "123056",
+    "120345",
+    "1234560abc",
+    "aabbcc",
+    "abcdef1"
+  };
+
+  for (const auto & i : VALID) {
+    auto b = BigInt::from_string(i);
+    REQUIRE(b.has_value());
+    REQUIRE(b->to_string() == i);
+  }
+  
+  auto invalid_hex = "aabbcc..";
+  {
+    auto b = BigInt::from_string(invalid_hex);
+    REQUIRE(!b);
+  }
+  
+}
+
+TEST_CASE("BigInt::from_int", "[big_int]") {
+  auto b = BigInt::from_int(0xaabbccdd);
+  REQUIRE(b.to_string()=="aabbccdd");
+}

test/test_crypto.cpp

@@ -0,0 +1,250 @@
+
+#include <catch2/catch_test_macros.hpp>
+
+//#include "cryptlib.h"
+//#include "integer.h"
+//#include "nbtheory.h"
+//#include "osrng.h"
+//#include "rsa.h"
+//#include "sha.h"
+
+#include <iostream>
+#include <stdexcept>
+
+/*
+CryptoPP::Integer blind_signature(const CryptoPP::SecByteBlock &orig,
+                                  const CryptoPP::Integer &r,
+                                  const CryptoPP::RSA::PublicKey &pub_key,
+                                  const CryptoPP::RSA::PrivateKey &priv_key) {
+    using namespace CryptoPP;
+    using std::cout;
+    using std::endl;
+
+    // Convenience
+    const Integer &n = pub_key.GetModulus();
+    const Integer &e = pub_key.GetPublicExponent();
+//  const Integer &d = priv_key.GetPrivateExponent();
+
+// For sizing the hashed message buffer. This should be SHA256 size.
+    const size_t sig_size = UnsignedMin(SHA256::BLOCKSIZE, n.ByteCount());
+// Scratch
+    SecByteBlock buff_1, buff_2, buff_3;
+
+    Integer m(orig.data(), orig.size());
+    cout << "Message: " << std::hex << m << endl;
+
+    // Hash message per Rabin (1979)
+    buff_1.resize(sig_size);
+    SHA256 hash_1;
+    hash_1.CalculateTruncatedDigest(buff_1, buff_1.size(), orig, orig.size());
+
+    // H(m) as Integer
+    Integer hm(buff_1.data(), buff_1.size());
+    cout << "H(m): " << std::hex << hm << endl;
+
+    // Blinding factor
+    Integer b = a_exp_b_mod_c(r, e, n);
+    cout << "Random: " << std::hex << b << endl;
+
+    // Alice blinded message
+    Integer mm = a_times_b_mod_c(hm, b, n);
+    cout << "Blind msg: " << std::hex << mm << endl;
+
+    AutoSeededRandomPool prng;
+
+    // Bob sign
+    Integer ss = priv_key.CalculateInverse(prng, mm);
+    cout << "Blind sign: " << ss << endl;
+
+    return ss;
+}
+
+CryptoPP::Integer unblind_signature(const CryptoPP::Integer &ss,
+                                    const CryptoPP::Integer &r,
+                                    const CryptoPP::RSA::PublicKey &pub_key) {
+
+    const CryptoPP::Integer &n = pub_key.GetModulus();
+    CryptoPP::Integer s = a_times_b_mod_c(ss, r.InverseMod(n), n);
+    return s;
+}
+
+CryptoPP::Integer verify(CryptoPP::Integer const &ss,
+                         const CryptoPP::Integer &r,
+                         const CryptoPP::RSA::PublicKey &pub_key) {
+    CryptoPP::Integer s = unblind_signature(ss, r, pub_key);
+    CryptoPP::Integer v = pub_key.ApplyFunction(s);
+    return v;
+}
+
+TEST_CASE("cryptopp1", "[crypto]") {
+    using namespace CryptoPP;
+    using std::cout;
+    using std::endl;
+    using std::runtime_error;
+
+    // Bob artificially small key pair
+    AutoSeededRandomPool prng;
+    RSA::PrivateKey priv_key;
+
+    priv_key.GenerateRandomWithKeySize(prng, 64U);
+    RSA::PublicKey pub_key(priv_key);
+
+    // Convenience
+    const Integer &n = pub_key.GetModulus();
+    const Integer &e = pub_key.GetPublicExponent();
+    const Integer &d = priv_key.GetPrivateExponent();
+
+    // Print params
+    cout << "Pub mod: " << std::hex << pub_key.GetModulus() << endl;
+    cout << "Pub exp: " << std::hex << e << endl;
+    cout << "Priv mod: " << std::hex << priv_key.GetModulus() << endl;
+    cout << "Priv exp: " << std::hex << d << endl;
+    const char *MESSAGE = "secret";
+    SecByteBlock orig((const byte *) MESSAGE, 6U);
+
+    // Alice blinding
+    Integer r;
+    do {
+        r.Randomize(prng, Integer::One(), n - Integer::One());
+    } while (!RelativelyPrime(r, n));
+    CryptoPP::Integer ss = blind_signature(orig,
+                                           r,
+                                           pub_key,
+                                           priv_key);
+    // Alice checks s(s'(x)) = x. This is from Chaum's paper
+    Integer c = pub_key.ApplyFunction(ss);
+    cout << "Check sign: " << c << endl;
+    //if (c != mm) {
+    //   throw runtime_error("Alice cross-check failed");
+    // }
+    // Alice remove blinding
+    Integer s = unblind_signature(ss, r, pub_key);
+    cout << "Unblind sign: " << s << endl;
+
+    // Eve verifies
+    Integer v = verify(ss, r, pub_key);
+    cout << "Verify: " << std::hex << v << endl;
+
+    // Scratch
+    SecByteBlock buff_2, buff_3;
+
+    // Convert to a string
+    size_t req = v.MinEncodedSize();
+    buff_2.resize(req);
+    v.Encode(&buff_2[0], buff_2.size());
+
+    // Hash message per Rabin (1979)
+    const size_t sig_size = UnsignedMin(SHA256::BLOCKSIZE, n.ByteCount());
+    buff_3.resize(sig_size);
+    SHA256 hash_2;
+    hash_2.CalculateTruncatedDigest(buff_3, buff_3.size(), orig, orig.size());
+
+    // Constant time compare
+    bool equal = buff_2.size() == buff_3.size() &&
+                 VerifyBufsEqual(buff_2.data(), buff_3.data(), buff_3.size());
+
+    if (!equal) {
+        throw runtime_error("Eve verified failed");
+    }
+    cout << "Verified signature" << endl;
+
+
+}
+*/
+/*
+TEST_CASE("cryptopp", "[crypto]") {
+    using namespace CryptoPP;
+    using std::cout;
+    using std::endl;
+    using std::runtime_error;
+
+    // Bob artificially small key pair
+    AutoSeededRandomPool prng;
+    RSA::PrivateKey priv_key;
+
+    priv_key.GenerateRandomWithKeySize(prng, 64U);
+    RSA::PublicKey pub_key(priv_key);
+
+    // Convenience
+    const Integer &n = pub_key.GetModulus();
+    const Integer &e = pub_key.GetPublicExponent();
+    const Integer &d = priv_key.GetPrivateExponent();
+
+    // Print params
+    cout << "Pub mod: " << std::hex << pub_key.GetModulus() << endl;
+    cout << "Pub exp: " << std::hex << e << endl;
+    cout << "Priv mod: " << std::hex << priv_key.GetModulus() << endl;
+    cout << "Priv exp: " << std::hex << d << endl;
+
+    // For sizing the hashed message buffer. This should be SHA256 size.
+    const size_t sig_size = UnsignedMin(SHA256::BLOCKSIZE, n.ByteCount());
+
+    // Scratch
+    SecByteBlock buff_1, buff_2, buff_3;
+
+    // Alice original message to be signed by Bob
+    SecByteBlock orig((const byte *) "secret", 6U);
+    Integer m(orig.data(), orig.size());
+    cout << "Message: " << std::hex << m << endl;
+
+    // Hash message per Rabin (1979)
+    buff_1.resize(sig_size);
+    SHA256 hash_1;
+    hash_1.CalculateTruncatedDigest(buff_1, buff_1.size(), orig, orig.size());
+
+    // H(m) as Integer
+    Integer hm(buff_1.data(), buff_1.size());
+    cout << "H(m): " << std::hex << hm << endl;
+
+    // Alice blinding
+    Integer r;
+    do {
+        r.Randomize(prng, Integer::One(), n - Integer::One());
+    } while (!RelativelyPrime(r, n));
+
+    // Blinding factor
+    Integer b = a_exp_b_mod_c(r, e, n);
+    cout << "Random: " << std::hex << b << endl;
+
+    // Alice blinded message
+    Integer mm = a_times_b_mod_c(hm, b, n);
+    cout << "Blind msg: " << std::hex << mm << endl;
+
+    // Bob sign
+    Integer ss = priv_key.CalculateInverse(prng, mm);
+    cout << "Blind sign: " << ss << endl;
+
+    // Alice checks s(s'(x)) = x. This is from Chaum's paper
+    Integer c = pub_key.ApplyFunction(ss);
+    cout << "Check sign: " << c << endl;
+    if (c != mm) {
+        throw runtime_error("Alice cross-check failed");
+    }
+    // Alice remove blinding
+    Integer s = a_times_b_mod_c(ss, r.InverseMod(n), n);
+    cout << "Unblind sign: " << s << endl;
+
+    // Eve verifies
+    Integer v = pub_key.ApplyFunction(s);
+    cout << "Verify: " << std::hex << v << endl;
+
+    // Convert to a string
+    size_t req = v.MinEncodedSize();
+    buff_2.resize(req);
+    v.Encode(&buff_2[0], buff_2.size());
+
+    // Hash message per Rabin (1979)
+    buff_3.resize(sig_size);
+    SHA256 hash_2;
+    hash_2.CalculateTruncatedDigest(buff_3, buff_3.size(), orig, orig.size());
+
+    // Constant time compare
+    bool equal = buff_2.size() == buff_3.size() &&
+                 VerifyBufsEqual(buff_2.data(), buff_3.data(), buff_3.size());
+
+    if (!equal) {
+        throw runtime_error("Eve verified failed");
+    }
+    cout << "Verified signature" << endl;
+}
+*/

test/test_json_s8n.cpp

@@ -2,43 +2,45 @@
 #include "model.hpp"
 #include <catch2/catch_test_macros.hpp>
 
-TEST_CASE("PublicKey::to_json", "[to_json]") {
+TEST_CASE( "PublicKey::to_json", "[to_json]" ) {
-  PublicKey k{"daaa63ddda38c189b8c49020c8276adbe0a695685a...", "65537"};
   
+  PublicKey k //{ BigInt::from_string("daaa63ddda38c189b8c49020c8276adbe0a695685a...").value(),
+    //    BigInt::from_int(65537UL) };
+    ;
   auto json = k.to_json();
 
-  REQUIRE(json["modulus"].dump() == "\"" + k.modulus + "\"");
+  REQUIRE( json["modulus"].dump() == "\"" + k.modulus.to_string() + "\""  );
-  REQUIRE(json["public_exponent"].dump() == "\"" + k.public_exponent + "\"");
+  REQUIRE( json["public_exponent"].dump() == "\"" + k.public_exponent.to_string()+"\"" );
-  REQUIRE(json["type"].dump() == "\"rsa public key\"");
+  REQUIRE( json["type"].dump() == "\"rsa public key\"" );
-  REQUIRE(json.keys().size() == 3);
+  REQUIRE( json.keys().size() == 3U );
 }
 
-TEST_CASE("RequestCDDSerial::from_string", "[from_string]") {
+TEST_CASE("RequestCDDCSerial::from_string", "[from_string]") {
   // good case
   std::string good = "{"
                      "\"message_reference\": 100000,"
                      "\"type\": \"request cdd serial\""
                      "}";
 
-  auto res = RequestCDDSerial::from_string(good);
+  auto res = RequestCDDCSerial::from_string(good);
   REQUIRE(res.has_value() == true);
   REQUIRE(res->message_reference == 100000);
 
   // bad cases
-  res = RequestCDDSerial::from_string("");
+  res = RequestCDDCSerial::from_string("");
   REQUIRE(res.has_value() == false);
 
   // invalid type
-  res = RequestCDDSerial::from_string("{"
+  res = RequestCDDCSerial::from_string("{"
-                                      "\"message_reference\": 100000,"
+                                       "\"message_reference\": 100000,"
-                                      "\"type\": \"request something wrong\""
+                                       "\"type\": \"request something wrong\""
-                                      "}");
+                                       "}");
   REQUIRE(res.has_value() == false);
 
   // invalid attribute name
-  res = RequestCDDSerial::from_string("{"
+  res = RequestCDDCSerial::from_string("{"
-                                      "\"x_message_reference\": 100000,"
+                                       "\"x_message_reference\": 100000,"
-                                      "}");
+                                       "}");
   REQUIRE(res.has_value() == false);
 }
 
@@ -76,15 +78,14 @@ TEST_CASE("RequestCDDC::from_string", "[from_string]") {
 
 TEST_CASE("RequestMKCs::from_string", "[from_string]") {
   // good case
-  auto res =
+  auto res = RequestMKCs::from_string( "{"
-      RequestMKCs::from_string("{"
+				       "\"denominations\": [1, 2, 5],"
-                               "\"denominations\": [1, 2, 5],"
+				       "\"message_reference\": 100002,"
-                               "\"message_reference\": 100002,"
+				       "\"mint_key_ids\": [],"
-                               "\"mint_key_ids\": [],"
+				       "\"type\": \"request mint key certificates\""
-                               "\"type\": \"request mint key certificates\""
+				       "}");
-                               "}");
+  const std::vector<uint32_t> EXPECTED_DENOMINATIONS = {1,2,5};
-  const std::vector<uint32_t> EXPECTED_DENOMINATIONS = {1, 2, 5};
+  const std::vector<BigInt> EXPECTED_MINT_KEY_IDS = {};
-  const std::vector<uint32_t> EXPECTED_MINT_KEY_IDS = {};
 
   REQUIRE(res.has_value() == true);
   REQUIRE(res->denominations == EXPECTED_DENOMINATIONS);
@@ -129,62 +130,59 @@ TEST_CASE("Blind::from_json", "[from_string]") {
   auto good = crow::json::load(
       "{"
       "\"blinded_payload_hash\": "
-      "\"924edb672c3345492f38341ff86b57181da4c673ef...\","
+      "\"924edb672c3345492f38341ff86b57181da4c673efd5fd76c0f64e369974c678f89ffcb1c5f77bf04911a9a63831b52675b70c06548a4d945ec5dd1d825ab08\","
       "\"mint_key_id\": \"1ceb977bb531c65f133ab8b0d60862b17369d96\","
       "\"reference\": \"a0\","
       "\"type\": \"blinded payload hash\""
       "}");
 
   auto res = Blind::from_json(good);
-  REQUIRE(res.has_value() == true);
+  REQUIRE(res.has_value()==true);
-  REQUIRE(res->blinded_payload_hash ==
+  REQUIRE(res->blinded_payload_hash.to_string()==
-          "924edb672c3345492f38341ff86b57181da4c673ef...");
+	  "924edb672c3345492f38341ff86b57181da4c673efd5fd76c0f64e369974c678f89ffcb1c5f77bf04911a9a63831b52675b70c06548a4d945ec5dd1d825ab08");
-  REQUIRE(res->mint_key_id == "1ceb977bb531c65f133ab8b0d60862b17369d96");
+  REQUIRE(res->mint_key_id.to_string()=="1ceb977bb531c65f133ab8b0d60862b17369d96");
-  REQUIRE(res->reference == "a0");
+  REQUIRE(res->reference=="a0");
   // bad cases 
-  // wrong_type["blinded_payload_hash"]=
+  // wrong_type["blinded_payload_hash"]= "924edb672c3345492f38341ff86b57181da4c673ef...";
-  // "924edb672c3345492f38341ff86b57181da4c673ef..."; wrong_type["mint_key_id"]=
+  // wrong_type["mint_key_id"]= "1ceb977bb531c65f133ab8b0d60862b17369d96";
-  // "1ceb977bb531c65f133ab8b0d60862b17369d96"; wrong_type["reference"] = "a0";
+  // wrong_type["reference"] = "a0";
   // wrong_type["type"]= "wrong type";
 
   // res = Blind::from_json(wrong_type);
 }
 
 TEST_CASE("RequestMint::from_string", "[from_string]") {
-  // good case
-  auto res = RequestMint::from_string(
-      "{"
-      "\"blinds\": ["
-      "{"
-      "\"blinded_payload_hash\": "
-      "\"924edb672c3345492f38341ff86b57181da4c673ef...\","
-      "\"mint_key_id\": \"1ceb977bb531c65f133ab8b0d60862b17369d96\","
-      "\"reference\": \"a0\","
-      "\"type\": \"blinded payload hash\""
-      "},"
-      "{"
-      "\"blinded_payload_hash\": "
-      "\"95db92e1c46ebea5edec5e508a831263de6fb78b4c...\","
-      "\"mint_key_id\": \"f2864e5cd937dbaa4825e73a81062de162143682\","
-      "\"reference\": \"a1\","
-      "\"type\": \"blinded payload hash\""
-      "},"
-      "{"
-      "\"blinded_payload_hash\": "
-      "\"10afac98ac43eb40e996c621d5db4d2238348e3f74...\","
-      "\"mint_key_id\": \"897a16bf12bd9ba474ef7be0e3a53553a7b4ece8\","
-      "\"reference\": \"a2\","
-      "\"type\": \"blinded payload hash\""
-      "}"
-      "],"
-      "\"message_reference\": 100003,"
-      "\"transaction_reference\": \"b2221a58008a05a6c4647159c324c985\","
-      "\"type\": \"request mint\""
-      "}");
 
-  REQUIRE(res.has_value() == true);
+  // good case
-  REQUIRE(res->message_reference == 100003);
+  auto res = RequestMint::from_string( "{"
-  REQUIRE(res->transaction_reference == "b2221a58008a05a6c4647159c324c985");
+				       "\"blinds\": ["
+				       "{"
+				       "\"blinded_payload_hash\": \"924edb672c3345492f38341ff86b57181da4c673efd5fd76c0f64e369974c678f89ffcb1c5f77bf04911a9a63831b52675b70c06548a4d945ec5dd1d825ab08\","
+				       "\"mint_key_id\": \"1ceb977bb531c65f133ab8b0d60862b17369d96\","
+				       "\"reference\": \"a0\","
+				       "\"type\": \"blinded payload hash\""
+				       "},"
+				       "{"
+				       "\"blinded_payload_hash\": \"95db92e1c46ebea5edec5e508a831263de6fb78b4cf9187593f6af815b51db9db35ad5eaf2c0c83bd7e13c999df4f0f1af65b367eb7c2b6addb9735dce156b5\","
+				       "\"mint_key_id\": \"f2864e5cd937dbaa4825e73a81062de162143682\","
+				       "\"reference\": \"a1\","
+				       "\"type\": \"blinded payload hash\""
+				       "},"
+				       "{"
+				       "\"blinded_payload_hash\": \"10afac98ac43eb40e996c621d5db4d2238348e3f74850856d940955da0fd24fa4d3aee79da1e9da24e85cf9cefd96feaca5b26a9353a3d9fcb4bd34145046ce8\","
+				       "\"mint_key_id\": \"897a16bf12bd9ba474ef7be0e3a53553a7b4ece8\","
+				       "\"reference\": \"a2\","
+				       "\"type\": \"blinded payload hash\""
+				       "}"
+				       "],"
+				       "\"message_reference\": 100003,"
+				       "\"transaction_reference\": \"b2221a58008a05a6c4647159c324c985\","
+				       "\"type\": \"request mint\""
+				      "}");
+
+  REQUIRE(res.has_value()==true);
+  REQUIRE(res->message_reference==100003);
+  REQUIRE(res->transaction_reference.to_string() == "b2221a58008a05a6c4647159c324c985");
   /// \todo check blinds
 
   // bad cases
@@ -228,7 +226,7 @@ TEST_CASE("RequestRenew::from_string", "[from_string]") {
       "  \"blinds\": ["
       "    {"
       "      \"blinded_payload_hash\": "
-      "\"7ed0cda1c1b36f544514b12848b8436974b7b9f6c7...\","
+      "\"7ed0cda1c1b36f544514b12848b8436974b7b9f6c7231ebcc566678e3478d3279db03872e4710413ad20a55d56ef12fb1800ac187195322535a626e178931cf9\","
       "      \"mint_key_id\": \"f2864e5cd937dbaa4825e73a81062de162143682\","
       "      \"reference\": \"b0\","
       "      \"type\": \"blinded payload hash\""
@@ -280,16 +278,15 @@ TEST_CASE("RequestRenew::from_string", "[from_string]") {
 
 TEST_CASE("RequestResume::from_string", "[from_string]") {
   // good case
-  auto res = RequestResume::from_string(
+  auto res = RequestResume::from_string( "{"
-      "{"
+				       "\"message_reference\": 100005,"
-      "\"message_reference\": 100005,"
+				       "\"transaction_reference\": \"ad45f23d3b1a11df587fd2803bab6c39\","
-      "\"transaction_reference\": \"ad45f23d3b1a11df587fd2803bab6c39\","
+				       "\"type\": \"request resume\""
-      "\"type\": \"request resume\""
+				       "}");
-      "}");
 
-  REQUIRE(res.has_value() == true);
+  REQUIRE(res.has_value()==true);
-  REQUIRE(res->message_reference == 100005);
+  REQUIRE(res->message_reference==100005);
-  REQUIRE(res->transaction_reference == "ad45f23d3b1a11df587fd2803bab6c39");
+  REQUIRE(res->transaction_reference.to_string()=="ad45f23d3b1a11df587fd2803bab6c39");
   
   // bad cases
   res = RequestResume::from_string("");

vcpkg.json

@@ -0,0 +1,9 @@
+{
+    "name": "crow",
+    "version-string": "master",
+    "dependencies": [
+        "asio",
+        "openssl",
+        "zlib"
+    ]
+}