diff --git a/lang/cpp/src/context.h b/lang/cpp/src/context.h
--- a/lang/cpp/src/context.h
+++ b/lang/cpp/src/context.h
@@ -324,6 +324,9 @@
     Error startRevokeSignature(const Key &key, const Key &signingKey,
                                const std::vector<UserID> &userIds = std::vector<UserID>());
 
+    Error addAdsk(const Key &k, const char *adsk);
+    Error startAddAdsk(const Key &k, const char *adsk);
+
     // using TofuInfo::Policy
     Error setTofuPolicy(const Key &k, unsigned int policy);
     Error setTofuPolicyStart(const Key &k, unsigned int policy);
diff --git a/lang/cpp/src/context.cpp b/lang/cpp/src/context.cpp
--- a/lang/cpp/src/context.cpp
+++ b/lang/cpp/src/context.cpp
@@ -1799,6 +1799,16 @@
                  key.impl(), signingKey.impl(), uids.c_str(), flags));
 }
 
+Error Context::addAdsk(const Key &k, const char *adsk)
+{
+    return Error(d->lasterr = gpgme_op_createsubkey(d->ctx, k.impl(), adsk, 0, 0, GPGME_CREATE_ADSK));
+}
+
+Error Context::startAddAdsk(const Key &k, const char *adsk)
+{
+    return Error(d->lasterr = gpgme_op_createsubkey_start(d->ctx, k.impl(), adsk, 0, 0, GPGME_CREATE_ADSK));
+}
+
 Error Context::setFlag(const char *name, const char *value)
 {
   return Error(d->lasterr = gpgme_set_ctx_flag(d->ctx, name, value));
diff --git a/lang/qt/src/qgpgmequickjob.h b/lang/qt/src/qgpgmequickjob.h
--- a/lang/qt/src/qgpgmequickjob.h
+++ b/lang/qt/src/qgpgmequickjob.h
@@ -71,6 +71,7 @@
                         unsigned int flags = 0) override;
     void startRevokeSignature(const GpgME::Key &key, const GpgME::Key &signingKey,
                               const std::vector<GpgME::UserID> &userIds = std::vector<GpgME::UserID>()) override;
+    void startAddAdsk(const GpgME::Key &key, const char *adsk) override;
 };
 
 }
diff --git a/lang/qt/src/qgpgmequickjob.cpp b/lang/qt/src/qgpgmequickjob.cpp
--- a/lang/qt/src/qgpgmequickjob.cpp
+++ b/lang/qt/src/qgpgmequickjob.cpp
@@ -107,6 +107,12 @@
     return std::make_tuple(err, QString(), Error());
 }
 
+static QGpgMEQuickJob::result_type addAdskWorker(Context *ctx, const Key &key, const char *adsk)
+{
+    const auto err = ctx->addAdsk(key, adsk);
+    return std::make_tuple(err, QString(), Error());
+}
+
 void QGpgMEQuickJob::startCreate(const QString &uid,
                  const char *algo,
                  const QDateTime &expires,
@@ -140,4 +146,9 @@
     run(std::bind(&revokeSignatureWorker, std::placeholders::_1, key, signingKey, userIds));
 }
 
+void QGpgMEQuickJob::startAddAdsk(const GpgME::Key &key, const char *adsk)
+{
+    run(std::bind(&addAdskWorker, std::placeholders::_1, key, adsk));
+}
+
 #include "qgpgmequickjob.moc"
diff --git a/lang/qt/src/quickjob.h b/lang/qt/src/quickjob.h
--- a/lang/qt/src/quickjob.h
+++ b/lang/qt/src/quickjob.h
@@ -85,6 +85,9 @@
     virtual void startRevokeSignature(const GpgME::Key &key, const GpgME::Key &signingKey,
                                       const std::vector<GpgME::UserID> &userIds = std::vector<GpgME::UserID>()) = 0;
 
+    /** Start --quick-add-adsk */
+    virtual void startAddAdsk(const GpgME::Key &key, const char *adsk) = 0;
+
 Q_SIGNALS:
     void result(const GpgME::Error &error,
                 const QString &auditLogAsHtml = QString(), const GpgME::Error &auditLogError = GpgME::Error());