Add curve functions wrappers

tests/CMakeLists.txt

@@ -31,6 +31,7 @@ add_executable(
     monitor.cpp
     utilities.cpp
     timers.cpp
+    curve.cpp
 )
 
 target_include_directories(unit_tests PUBLIC ${CATCH_MODULE_PATH})

tests/curve.cpp

@@ -0,0 +1,29 @@
+#include <catch2/catch_all.hpp>
+#include <zmq.hpp>
+
+TEST_CASE("curve keypair", "[curve]")
+{
+    auto [public_key, secret_key] = zmq::curve::keypair();
+    CHECK(!public_key.empty());
+    CHECK(!secret_key.empty());
+}
+
+TEST_CASE("curve public_", "[curve]")
+{
+    auto secret_key = "D:)Q[IlAW!ahhC2ac:9*A}h:p?([4%wOTJ%JR%cs";
+    auto public_key = zmq::curve::public_(secret_key);
+    CHECK(public_key == "Yne@$w-vo<fVvi]a<NY6T1ed:M$fCG*[IaLV{hID");
+}
+
+TEST_CASE("curve z85 encode", "[curve]")
+{
+    std::vector<uint8_t> data{1,2,3,4,5,6,7,8};
+    auto encoded = zmq::curve::z85::encode(data);
+    CHECK(encoded == "0rJua1Qkhq");
+}
+
+TEST_CASE("curve z85 decode", "[curve]")
+{
+    auto decoded = zmq::curve::z85::decode("0rJua1Qkhq");
+    CHECK(decoded == std::vector<uint8_t>{1,2,3,4,5,6,7,8});
+}

zmq.hpp

@@ -107,6 +107,7 @@
 
 #include <cassert>
 #include <cstring>
+#include <cstdint>
 
 #include <type_traits>
 #include <algorithm>
@@ -2874,6 +2875,57 @@ class timers
 
 #endif // defined(ZMQ_CPP11) && defined(ZMQ_HAVE_TIMERS)
 
+namespace curve {
+
+inline std::pair<std::string, std::string> keypair()
+{
+    char public_key_buffer[41];
+    char secret_key_buffer[41];
+    int rc = zmq_curve_keypair(public_key_buffer, secret_key_buffer);
+    if (rc == -1)
+        throw zmq::error_t();
+    return std::pair{public_key_buffer, secret_key_buffer};
+}
+
+inline std::string public_(const std::string& secret)
+{
+    if (secret.size() != 40)
+        throw std::runtime_error("Invalid secret string size");
+    char public_key_buffer[41];
+    int rc = zmq_curve_public(public_key_buffer, secret.c_str());
+    if (rc == -1)
+        throw zmq::error_t();
+    return public_key_buffer;
+}
+
+namespace z85 {
+
+inline std::string encode(const std::vector<uint8_t>& data)
+{
+    size_t buffer_size = static_cast<double>(data.size()) * 1.25 + 1;
+    char *buffer = new char[buffer_size];
+    auto *result = zmq_z85_encode(buffer, data.data(), data.size());
+    if (result == nullptr)
+        throw zmq::error_t();
+    std::string dest(result);
+    delete [] buffer;
+    return dest;
+}
+
+inline std::vector<uint8_t> decode(const std::string& encoded)
+{
+    size_t dest_size = static_cast<double>(encoded.size()) * 0.8;
+    std::vector<uint8_t> dest(dest_size);
+    auto *result = zmq_z85_decode(dest.data(), encoded.c_str());
+    if (result == nullptr)
+        throw zmq::error_t();
+    return dest;
+}
+
+}
+
+}
+
 } // namespace zmq
 
 #endif // __ZMQ_HPP_INCLUDED__