Expose version of used libraries in the About dialog.

src/crypto/Crypto.cpp

@@ -27,6 +27,7 @@
 
 bool Crypto::m_initalized(false);
 QString Crypto::m_errorStr;
+QString Crypto::m_backendVersion;
 
 #if !defined(GCRYPT_VERSION_NUMBER) || (GCRYPT_VERSION_NUMBER < 0x010600)
 static int gcry_qt_mutex_init(void** p_sys)
@@ -80,7 +81,7 @@ bool Crypto::init()
 #if !defined(GCRYPT_VERSION_NUMBER) || (GCRYPT_VERSION_NUMBER < 0x010600)
     gcry_control(GCRYCTL_SET_THREAD_CBS, &gcry_threads_qt);
 #endif
-    gcry_check_version(0);
+    m_backendVersion = QString::fromLocal8Bit(gcry_check_version(0));
     gcry_control(GCRYCTL_INITIALIZATION_FINISHED, 0);
 
     if (!checkAlgorithms()) {
@@ -108,6 +109,11 @@ QString Crypto::errorString()
     return m_errorStr;
 }
 
+QString Crypto::backendVersion()
+{
+    return QString("libgcrypt ").append(m_backendVersion);
+}
+
 bool Crypto::backendSelfTest()
 {
     return (gcry_control(GCRYCTL_SELFTEST) == 0);

src/crypto/Crypto.h

@@ -29,6 +29,7 @@ public:
     static bool initalized();
     static bool backendSelfTest();
     static QString errorString();
+    static QString backendVersion();
 
 private:
     Crypto();
@@ -43,6 +44,7 @@ private:
 
     static bool m_initalized;
     static QString m_errorStr;
+    static QString m_backendVersion;
 };
 
 #endif // KEEPASSX_CRYPTO_H

src/gui/AboutDialog.cpp

@@ -21,6 +21,7 @@
 #include "config-keepassx.h"
 #include "version.h"
 #include "core/FilePath.h"
+#include "crypto/Crypto.h"
 
 AboutDialog::AboutDialog(QWidget* parent)
     : QDialog(parent)
@@ -49,6 +50,12 @@ AboutDialog::AboutDialog(QWidget* parent)
         m_ui->label_git->setText(labelText);
     }
 
+    QString libs = QString("%1\n- Qt %2\n- %3")
+            .arg(m_ui->label_libs->text())
+            .arg(QString::fromLocal8Bit(qVersion()))
+            .arg(Crypto::backendVersion());
+    m_ui->label_libs->setText(libs);
+
     setAttribute(Qt::WA_DeleteOnClose);
     connect(m_ui->buttonBox, SIGNAL(rejected()), SLOT(close()));
 }

src/gui/AboutDialog.ui

@@ -86,6 +86,13 @@
      </property>
     </widget>
    </item>
+   <item>
+    <widget class="QLabel" name="label_libs">
+     <property name="text">
+      <string>Using:</string>
+     </property>
+    </widget>
+   </item>
    <item>
     <widget class="QDialogButtonBox" name="buttonBox">
      <property name="standardButtons">