diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index 9cc0f030..42f2c1fb 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -69,10 +69,12 @@ if(BUILD_TESTING)
   list(APPEND test_entropy_sources entropy.cpp entropy.h func.h func_base.cpp xfile.h)
   list(APPEND test_x509name_sources x509name.cpp x509name.h func_base.h func_base.cpp
                                     BioByteArray.h BioByteArray.cpp )
+  list(APPEND test_digest_sources digest.cpp digest.h func_base.cpp func_base.h)
 
   Test(test_biobytearray)
   Test(test_asn1int)
   Test(test_asn1time)
   Test(test_entropy)
   Test(test_x509name)
+  Test(test_digest)
 endif()
diff --git a/lib/test_digest.cpp b/lib/test_digest.cpp
new file mode 100644
index 00000000..b2e165ac
--- /dev/null
+++ b/lib/test_digest.cpp
@@ -0,0 +1,44 @@
+/* vi: set sw=4 ts=4:
+ *
+ * Copyright (C) 2023 Christian Hohnstaedt.
+ *
+ * All rights reserved.
+ */
+
+#include <QTest>
+#include <QList>
+
+#include "digest.h"
+#include <openssl/evp.h>
+
+class test_digest: public QObject
+{
+    Q_OBJECT
+private slots:
+    void default_digest();
+    void convert();
+};
+
+void test_digest::default_digest()
+{
+	digest d(digest::getDefault());
+	QCOMPARE(d.name(), "SHA256");
+	digest::setDefault("md5");
+	QVERIFY(digest::getDefault().isInsecure());
+}
+
+void test_digest::convert()
+{
+	digest d(EVP_sha512());
+	digest e("sha512");
+
+	QCOMPARE(d.name(), "SHA512");
+	QCOMPARE(d.MD(), e.MD());
+	QVERIFY(!d.isInsecure());
+	d.adjust(QList<int>({ NID_md5, NID_sha256, NID_sha384 }));
+	QCOMPARE(d.name(), "SHA384");
+
+}
+
+QTEST_MAIN(test_digest)
+#include "test_digest.moc"