openssl utils

openssl_utils.cpp

@@ -0,0 +1,67 @@
+#include "openssl_utils.hpp"
+
+#include "c_callback.hpp"
+
+#include <openssl/err.h>
+#include <openssl/pem.h>
+
+#include <boost/log/trivial.hpp>
+
+#include <cstdio>
+
+using namespace std::literals;
+
+auto log_openssl_errors(const std::string_view prefix) -> void
+{
+    auto err_cb = [prefix](const char *str, size_t len) -> int {
+        BOOST_LOG_TRIVIAL(error) << prefix << std::string_view{str, len};
+        return 0;
+    };
+    ERR_print_errors_cb(CCallback<decltype(err_cb)>::invoke, &err_cb);
+}
+
+auto cert_from_file(const std::string &filename) -> X509_Ref
+{
+    X509_Ref cert;
+    if (const auto fp = fopen(filename.c_str(), "r"))
+    {
+        cert.reset(PEM_read_X509(fp, nullptr, nullptr, nullptr));
+        if (cert.get() == nullptr)
+        {
+            log_openssl_errors("Reading certificate: "sv);
+        }
+        fclose(fp);
+    }
+    else
+    {
+        const auto err = strerror(errno);
+        BOOST_LOG_TRIVIAL(error) << "Opening certificate: " << err;
+    }
+    return cert;
+}
+
+auto key_from_file(const std::string &filename, const std::string_view password) -> EVP_PKEY_Ref
+{
+    EVP_PKEY_Ref key;
+    if (const auto fp = fopen(filename.c_str(), "r"))
+    {
+        auto cb = [password](char * const buf, int const size, int) -> int {
+            if (size < password.size()) { return -1; }
+            std::copy(password.begin(), password.end(), buf);
+            return password.size();
+        };
+
+        key.reset(PEM_read_PrivateKey(fp, nullptr, CCallback<decltype(cb)>::invoke, &cb));
+        if (key.get() == nullptr)
+        {
+            log_openssl_errors("Reading private key: "sv);
+        }
+        fclose(fp);
+    }
+    else
+    {
+        const auto err = strerror(errno);
+        BOOST_LOG_TRIVIAL(error) << "Opening private key: " << err;
+    }
+    return key;
+}

openssl_utils.hpp

@@ -0,0 +1,9 @@
+#pragma once
+
+#include "ref.hpp"
+
+#include <string_view>
+
+auto log_openssl_errors(const std::string_view prefix) -> void;
+auto key_from_file(const std::string &filename, const std::string_view password) -> EVP_PKEY_Ref;
+auto cert_from_file(const std::string &filename) -> X509_Ref;