diff --git a/src/corelib/tools/qmessageauthenticationcode.cpp b/src/corelib/tools/qmessageauthenticationcode.cpp
index 2d0145147a5..9580b024c2f 100644
--- a/src/corelib/tools/qmessageauthenticationcode.cpp
+++ b/src/corelib/tools/qmessageauthenticationcode.cpp
@@ -122,10 +122,7 @@ void QMessageAuthenticationCodePrivate::initMessageHash()
     const int blockSize = qt_hash_block_size(method);
 
     if (key.size() > blockSize) {
-        QCryptographicHash hash(method);
-        hash.addData(key);
-        key = hash.result();
-        hash.reset();
+        key = QCryptographicHash::hash(key, method);
     }
 
     if (key.size() < blockSize) {
diff --git a/src/network/access/qnetworkdiskcache.cpp b/src/network/access/qnetworkdiskcache.cpp
index d3320d05e3c..6f02405c0f0 100644
--- a/src/network/access/qnetworkdiskcache.cpp
+++ b/src/network/access/qnetworkdiskcache.cpp
@@ -594,10 +594,9 @@ QString QNetworkDiskCachePrivate::uniqueFileName(const QUrl &url)
     cleanUrl.setPassword(QString());
     cleanUrl.setFragment(QString());
 
-    QCryptographicHash hash(QCryptographicHash::Sha1);
-    hash.addData(cleanUrl.toEncoded());
+    const QByteArray hash = QCryptographicHash::hash(cleanUrl.toEncoded(), QCryptographicHash::Sha1);
     // convert sha1 to base36 form and return first 8 bytes for use as string
-    const QByteArray id = QByteArray::number(*(qlonglong*)hash.result().constData(), 36).left(8);
+    const QByteArray id = QByteArray::number(*(qlonglong*)hash.data(), 36).left(8);
     // generates <one-char subdir>/<8-char filname.d>
     uint code = (uint)id.at(id.length()-1) % 16;
     QString pathFragment = QString::number(code, 16) + QLatin1Char('/')
diff --git a/src/plugins/tls/shared/qsslsocket_qt.cpp b/src/plugins/tls/shared/qsslsocket_qt.cpp
index 128459ea19c..8f8a87138fa 100644
--- a/src/plugins/tls/shared/qsslsocket_qt.cpp
+++ b/src/plugins/tls/shared/qsslsocket_qt.cpp
@@ -109,15 +109,11 @@ static QByteArray _q_PKCS12_keygen(char id, const QByteArray &salt, const QStrin
     QByteArray A;
     QByteArray B;
     B.resize(v);
-    QCryptographicHash hash(QCryptographicHash::Sha1);
     for (int i = 0; i < c; ++i) {
         // hash r iterations
         QByteArray Ai = D + I;
-        for (int j = 0; j < r; ++j) {
-            hash.reset();
-            hash.addData(Ai);
-            Ai = hash.result();
-        }
+        for (int j = 0; j < r; ++j)
+            Ai = QCryptographicHash::hash(Ai, QCryptographicHash::Sha1);
 
         for (int j = 0; j < v; ++j)
             B[j] = Ai[j % u];