refactor: use vector<uint8_t> for keys

src/lib/base/String.cpp

@@ -178,6 +178,17 @@ std::string toHex(const std::string &subject, int width, const char fill)
   return ss.str();
 }
 
+std::string toHex(const std::vector<uint8_t> &input, int width, const char fill)
+{
+  std::stringstream ss;
+  ss << std::hex;
+  for (unsigned int i = 0; i < input.size(); i++) {
+    ss << std::setw(width) << std::setfill(fill) << static_cast<int>(input[i]);
+  }
+
+  return ss.str();
+}
+
 // clang-format off
 int fromHexChar(char c)
 {

src/lib/base/String.h

@@ -65,6 +65,15 @@ Return a new hexString
 */
 std::string toHex(const std::string &subject, int width, const char fill = '0');
 
+/**
+ * @brief toHex Convert each value in input into a hex string
+ * @param input vector of uint8_t
+ * @param width
+ * @param fill fill character 0 is default
+ * @return a hex string
+ */
+std::string toHex(const std::vector<uint8_t> &input, int width, const char fill = '0');
+
 /**
  * @brief fromHexChar Convert a single char to its hexidecmal value
  * @param c input char 0-F

src/lib/net/SecureSocket.cpp

@@ -627,8 +627,11 @@ bool SecureSocket::verifyCertFingerprint()
   }
 
   // format fingerprint into hexdecimal format with colon separator
-  std::string fingerprint(static_cast<char *>(static_cast<void *>(tempFingerprint)), tempFingerprintLen);
-  fingerprint = deskflow::formatSSLFingerprint(fingerprint);
+  std::vector<uint8_t> fingerprint_raw;
+  fingerprint_raw.assign(
+      reinterpret_cast<uint8_t *>(tempFingerprint), reinterpret_cast<uint8_t *>(tempFingerprint) + tempFingerprintLen
+  );
+  auto fingerprint = deskflow::formatSSLFingerprint(fingerprint_raw);
   LOG((CLOG_NOTE "server fingerprint: %s", fingerprint.c_str()));
 
   std::string trustedServersFilename;

src/lib/net/SecureUtils.cpp

@@ -10,12 +10,9 @@
 
 namespace deskflow {
 
-std::string formatSSLFingerprint(const std::string &fingerprint, bool convertToHex, bool enableSeparators)
+std::string formatSSLFingerprint(const std::vector<uint8_t> &fingerprint, bool enableSeparators)
 {
-  std::string result = fingerprint;
-
-  if (convertToHex)
-    result = deskflow::string::toHex(fingerprint, 2);
+  std::string result = deskflow::string::toHex(fingerprint, 2);
 
   deskflow::string::uppercase(result);
 

src/lib/net/SecureUtils.h

@@ -7,18 +7,18 @@
 
 #pragma once
 
+#include <stdint.h>
 #include <string>
+#include <vector>
 
 namespace deskflow {
-/**
 
+/**
  * @brief formatSSLFingerprint Format an ssl Fingerprint
  * @param fingerprint input string
- * @param convertToHex when true converts the string to a hex string
  * @param enableSeparators insert : seperator every byte when true
  * @return a Formated Fingerprint String
  */
-std::string
-formatSSLFingerprint(const std::string &fingerprint, bool convertToHex = true, bool enableSeparators = true);
+std::string formatSSLFingerprint(const std::vector<uint8_t> &fingerprint, bool enableSeparators = true);
 
 } // namespace deskflow

src/test/unittests/base/StringTests.cpp

@@ -1,5 +1,6 @@
 /*
  * Deskflow -- mouse and keyboard sharing utility
+ * SPDX-FileCopyrightText: (C) 2025 Deskflow Developers
  * SPDX-FileCopyrightText: (C) 2014 - 2016 Symless Ltd.
  * SPDX-License-Identifier: GPL-2.0-only WITH LicenseRef-OpenSSL-Exception
  */
@@ -48,6 +49,14 @@ TEST(StringTests, toHex_plaintext_hexString)
   EXPECT_EQ("666f6f626172", string::toHex("foobar", 2));
 }
 
+TEST(StringTests, toHex_vector_uint8_t_hexString)
+{
+  std::vector<std::uint8_t> subject{'f', 'o', 'o', 'b', 'a', 'r'};
+  int width = 2;
+
+  EXPECT_EQ("666f6f626172", string::toHex(subject, width));
+}
+
 TEST(StringTests, fromHexChar_plaintext_hexString)
 {
   EXPECT_EQ(-1, string::fromHexChar('z'));

src/test/unittests/net/SecureUtilsTests.cpp

@@ -11,11 +11,11 @@
 
 TEST(SecureUtilsTest, formatSSLFingerprints_fromHex_withSeperators)
 {
-  std::string fingerprint = "(\xFD\n\x98\x8A\x0E\xA1l\xD7\xE8l\xA7\xEEXAq\xCA\xB2\x8EI%\x94\x90%&\x05\x8D\xAF"
-                            "c\xED.0";
+  std::vector<uint8_t> fingerprint = {40,  253, 10,  152, 138, 14,  161, 108, 215, 232, 108, 167, 238, 88,  65, 113,
+                                      202, 178, 142, 73,  37,  148, 144, 37,  38,  5,   141, 175, 99,  237, 46, 48};
 
   ASSERT_EQ(
-      deskflow::formatSSLFingerprint(fingerprint, true, true), "28:FD:0A:98:8A:0E:A1:6C:D7:E8:6C:A7:EE:58:41:71:"
-                                                               "CA:B2:8E:49:25:94:90:25:26:05:8D:AF:63:ED:2E:30"
+      deskflow::formatSSLFingerprint(fingerprint, true),
+      "28:FD:0A:98:8A:0E:A1:6C:D7:E8:6C:A7:EE:58:41:71:CA:B2:8E:49:25:94:90:25:26:05:8D:AF:63:ED:2E:30"
   );
 }