diff --git a/src/core/Database.cpp b/src/core/Database.cpp
index 336820381..db13e2499 100644
--- a/src/core/Database.cpp
+++ b/src/core/Database.cpp
@@ -176,6 +176,11 @@ QByteArray Database::transformedMasterKey() const
     return m_data.transformedMasterKey;
 }
 
+QByteArray Database::challengeMasterSeed(const QByteArray& masterSeed) const
+{
+    return m_data.key.challenge(masterSeed);
+}
+
 void Database::setCipher(const Uuid& cipher)
 {
     Q_ASSERT(!cipher.isNull());
diff --git a/src/core/Database.h b/src/core/Database.h
index 3cd5ed1b1..607792332 100644
--- a/src/core/Database.h
+++ b/src/core/Database.h
@@ -89,6 +89,7 @@ public:
     quint64 transformRounds() const;
     QByteArray transformedMasterKey() const;
     const CompositeKey & key() const;
+    QByteArray challengeMasterSeed(const QByteArray& masterSeed) const;
 
     void setCipher(const Uuid& cipher);
     void setCompressionAlgo(Database::CompressionAlgorithm algo);