diff --git a/include/types.hpp b/include/types.hpp
index 304ee17..4f62fae 100644
--- a/include/types.hpp
+++ b/include/types.hpp
@@ -120,6 +120,19 @@ struct GetKeyPairResult {
     std::optional<KeyPair> pair;
 };
 
+namespace conversions {
+std::string encoding_format_to_string(EncodingFormat e);
+std::string ca_certificate_type_to_string(CaCertificateType e);
+std::string leaf_certificate_type_to_string(LeafCertificateType e);
+std::string certificate_type_to_string(CertificateType e);
+std::string hash_algorithm_to_string(HashAlgorithm e);
+std::string install_certificate_result_to_string(InstallCertificateResult e);
+std::string delete_certificate_result_to_string(DeleteCertificateResult e);
+std::string get_installed_certificates_status_to_string(GetInstalledCertificatesStatus e);
+std::string get_key_pair_status_to_string(GetKeyPairStatus e);
+
+} // namespace conversions
+
 } // namespace evse_security
 
 #endif // TYPES_HPP
diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index 514c5fc..68e3bf4 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -6,6 +6,7 @@ target_sources(evse_security
     PRIVATE
         evse_security.cpp
         x509_wrapper.cpp
+        types.cpp
 )
 
 target_include_directories(evse_security
diff --git a/lib/evse_security.cpp b/lib/evse_security.cpp
index 1bfc219..e339a4e 100644
--- a/lib/evse_security.cpp
+++ b/lib/evse_security.cpp
@@ -181,7 +181,7 @@ static CertificateType get_certificate_type(const CaCertificateType ca_certifica
 
 static std::string get_random_file_name(const std::string& extension) {
     char path[] = "XXXXXX";
-    mktemp(path);
+    mkstemp(path);
 
     return std::string(path) + extension;
 }
@@ -269,11 +269,12 @@ EvseSecurity::EvseSecurity(const FilePaths& file_paths, const std::optional<std:
 
     for (const auto& pair : this->ca_bundle_path_map) {
         if (!std::filesystem::exists(pair.second)) {
-            throw std::runtime_error("Could not find configured " + std::to_string((int)pair.first) +
-                                     " bundle file at: " + file_paths.csms_ca_bundle.string());
+            throw std::runtime_error("Could not find configured " +
+                                     conversions::ca_certificate_type_to_string(pair.first) +
+                                     " bundle file at: " + pair.second.string());
         } else if (std::filesystem::is_directory(pair.second)) {
-            throw std::runtime_error("Provided bundle " + std::to_string((int)pair.first) +
-                                     " is directory: " + file_paths.csms_ca_bundle.string());
+            throw std::runtime_error("Provided bundle " + conversions::ca_certificate_type_to_string(pair.first) +
+                                     " is directory: " + pair.second.string());
         }
     }
 
diff --git a/lib/types.cpp b/lib/types.cpp
new file mode 100644
index 0000000..469965d
--- /dev/null
+++ b/lib/types.cpp
@@ -0,0 +1,147 @@
+// SPDX-License-Identifier: Apache-2.0
+// Copyright Pionix GmbH and Contributors to EVerest
+
+#include <types.hpp>
+
+namespace evse_security {
+
+namespace conversions {
+
+std::string encoding_format_to_string(EncodingFormat e) {
+    switch (e) {
+    case EncodingFormat::DER:
+        return "DER";
+    case EncodingFormat::PEM:
+        return "PEM";
+    default:
+        throw std::out_of_range("Could not convert EncodingFormat to string");
+    }
+};
+
+std::string ca_certificate_type_to_string(CaCertificateType e) {
+    switch (e) {
+    case CaCertificateType::V2G:
+        return "V2G";
+    case CaCertificateType::MO:
+        return "MO";
+    case CaCertificateType::CSMS:
+        return "CSMS";
+    case CaCertificateType::MF:
+        return "MF";
+    default:
+        throw std::out_of_range("Could not convert CaCertificateType to string");
+    }
+};
+
+std::string leaf_certificate_type_to_string(LeafCertificateType e) {
+    switch (e) {
+    case LeafCertificateType::CSMS:
+        return "CSMS";
+    case LeafCertificateType::V2G:
+        return "V2G";
+    case LeafCertificateType::MF:
+        return "MF";
+    default:
+        throw std::out_of_range("Could not convert LeafCertificateType to string");
+    }
+};
+
+std::string certificate_type_to_string(CertificateType e) {
+    switch (e) {
+    case CertificateType::V2GRootCertificate:
+        return "V2GRootCertificate";
+    case CertificateType::MORootCertificate:
+        return "MORootCertificate";
+    case CertificateType::CSMSRootCertificate:
+        return "CSMSRootCertificate";
+    case CertificateType::V2GCertificateChain:
+        return "V2GCertificateChain";
+    case CertificateType::MFRootCertificate:
+        return "MFRootCertificate";
+    default:
+        throw std::out_of_range("Could not convert CertificateType to string");
+    }
+};
+
+std::string hash_algorithm_to_string(HashAlgorithm e) {
+    switch (e) {
+    case HashAlgorithm::SHA256:
+        return "SHA256";
+    case HashAlgorithm::SHA384:
+        return "SHA384";
+    case HashAlgorithm::SHA512:
+        return "SHA512";
+    default:
+        throw std::out_of_range("Could not convert HashAlgorithm to string");
+    }
+};
+
+std::string install_certificate_result_to_string(InstallCertificateResult e) {
+    switch (e) {
+    case InstallCertificateResult::InvalidSignature:
+        return "InvalidSignature";
+    case InstallCertificateResult::InvalidCertificateChain:
+        return "InvalidCertificateChain";
+    case InstallCertificateResult::InvalidFormat:
+        return "InvalidFormat";
+    case InstallCertificateResult::InvalidCommonName:
+        return "InvalidCommonName";
+    case InstallCertificateResult::NoRootCertificateInstalled:
+        return "NoRootCertificateInstalled";
+    case InstallCertificateResult::Expired:
+        return "Expired";
+    case InstallCertificateResult::CertificateStoreMaxLengthExceeded:
+        return "CertificateStoreMaxLengthExceeded";
+    case InstallCertificateResult::WriteError:
+        return "WriteError";
+    case InstallCertificateResult::Accepted:
+        return "Accepted";
+    default:
+        throw std::out_of_range("Could not convert InstallCertificateResult to string");
+    }
+};
+
+std::string delete_certificate_result_to_string(DeleteCertificateResult e) {
+    switch (e) {
+    case DeleteCertificateResult::Accepted:
+        return "Accepted";
+    case DeleteCertificateResult::Failed:
+        return "Failed";
+    case DeleteCertificateResult::NotFound:
+        return "NotFound";
+    default:
+        throw std::out_of_range("Could not convert DeleteCertificateResult to string");
+    }
+};
+
+std::string get_installed_certificates_status_to_string(GetInstalledCertificatesStatus e) {
+    switch (e) {
+    case GetInstalledCertificatesStatus::Accepted:
+        return "Accepted";
+    case GetInstalledCertificatesStatus::NotFound:
+        return "NotFound";
+    default:
+        throw std::out_of_range("Could not convert GetInstalledCertificatesStatus to string");
+    }
+};
+
+std::string get_key_pair_status_to_string(GetKeyPairStatus e) {
+    switch (e) {
+    case GetKeyPairStatus::Accepted:
+        return "Accepted";
+    case GetKeyPairStatus::Rejected:
+        return "Rejected";
+    case GetKeyPairStatus::NotFound:
+        return "NotFound";
+    case GetKeyPairStatus::NotFoundValid:
+        return "NotFoundValid";
+    case GetKeyPairStatus::PrivateKeyNotFound:
+        return "PrivateKeyNotFound";
+    default:
+        throw std::out_of_range("Could not convert GetKeyPairStatus to string");
+    }
+};
+
+} // namespace conversions
+
+} // namespace evse_security