Adding db-info CLI command. (#4231)

This adds a basic db-show CLI command, to display
the information related to a database.

src/crypto/kdf/AesKdf.cpp

@@ -125,3 +125,8 @@ int AesKdf::benchmarkImpl(int msec) const
 
     return static_cast<int>(rounds * (static_cast<float>(msec) / timer.elapsed()));
 }
+
+QString AesKdf::toString() const
+{
+    return QObject::tr("AES (%1 rounds)").arg(QString::number(rounds()));
+}

src/crypto/kdf/AesKdf.h

@@ -30,6 +30,7 @@ public:
     QVariantMap writeParameters() override;
     bool transform(const QByteArray& raw, QByteArray& result) const override;
     QSharedPointer<Kdf> clone() const override;
+    QString toString() const override;
 
 protected:
     int benchmarkImpl(int msec) const override;

src/crypto/kdf/Argon2Kdf.cpp

@@ -211,3 +211,8 @@ int Argon2Kdf::benchmarkImpl(int msec) const
 
     return 1;
 }
+
+QString Argon2Kdf::toString() const
+{
+    return QObject::tr("Argon2 (%1 rounds, %2 KB)").arg(QString::number(rounds()), QString::number(memory()));
+}

src/crypto/kdf/Argon2Kdf.h

@@ -36,6 +36,7 @@ public:
     bool setMemory(quint64 kibibytes);
     quint32 parallelism() const;
     bool setParallelism(quint32 threads);
+    QString toString() const override;
 
 protected:
     int benchmarkImpl(int msec) const override;

src/crypto/kdf/Kdf.h

@@ -44,6 +44,8 @@ public:
     virtual bool transform(const QByteArray& raw, QByteArray& result) const = 0;
     virtual QSharedPointer<Kdf> clone() const = 0;
 
+    virtual QString toString() const = 0;
+
     int benchmark(int msec) const;
 
 protected: