lib/net: Extract fingerprint formatting out of SecureSocket

src/lib/net/SecureUtils.cpp

@@ -0,0 +1,38 @@
+/*
+    barrier -- mouse and keyboard sharing utility
+    Copyright (C) Barrier contributors
+
+    This package is free software; you can redistribute it and/or
+    modify it under the terms of the GNU General Public License
+    found in the file LICENSE that should have accompanied this file.
+
+    This package is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "SecureUtils.h"
+#include "base/String.h"
+
+void format_ssl_fingerprint(std::string& fingerprint, bool hex, bool separator)
+{
+    if (hex) {
+        // to hexadecimal
+        barrier::string::toHex(fingerprint, 2);
+    }
+
+    // all uppercase
+    barrier::string::uppercase(fingerprint);
+
+    if (separator) {
+        // add colon to separate each 2 characters
+        size_t separators = fingerprint.size() / 2;
+        for (size_t i = 1; i < separators; i++) {
+            fingerprint.insert(i * 3 - 1, ":");
+        }
+    }
+}