diff --git a/src/XML/ds/SPKISexp.php b/src/XML/ds/SPKISexp.php
new file mode 100644
index 00000000..1ca50c4a
--- /dev/null
+++ b/src/XML/ds/SPKISexp.php
@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SimpleSAML\XMLSecurity\XML\ds;
+
+use SimpleSAML\XML\Base64ElementTrait;
+
+/**
+ * Class representing a ds:SPKISexp element.
+ *
+ * @package simplesaml/xml-security
+ */
+final class SPKISexp extends AbstractDsElement
+{
+    use Base64ElementTrait;
+
+
+    /**
+     * @param string $content
+     */
+    public function __construct(string $content)
+    {
+        $this->setContent($content);
+    }
+}
diff --git a/tests/XML/ds/SPKISexpTest.php b/tests/XML/ds/SPKISexpTest.php
new file mode 100644
index 00000000..a3b32b6c
--- /dev/null
+++ b/tests/XML/ds/SPKISexpTest.php
@@ -0,0 +1,51 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SimpleSAML\XMLSecurity\Test\XML\ds;
+
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\TestCase;
+use SimpleSAML\XML\DOMDocumentFactory;
+use SimpleSAML\XML\TestUtils\SerializableElementTestTrait;
+use SimpleSAML\XMLSecurity\XML\ds\AbstractDsElement;
+use SimpleSAML\XMLSecurity\XML\ds\SPKISexp;
+
+use function dirname;
+use function strval;
+
+/**
+ * Class \SimpleSAML\XMLSecurity\Test\XML\ds\SPKISexpTest
+ *
+ * @package simplesamlphp/xml-security
+ */
+#[CoversClass(AbstractDsElement::class)]
+#[CoversClass(SPKISexp::class)]
+final class SPKISexpTest extends TestCase
+{
+    use SerializableElementTestTrait;
+
+    /**
+     */
+    public static function setUpBeforeClass(): void
+    {
+        self::$testedClass = SPKISexp::class;
+
+        self::$xmlRepresentation = DOMDocumentFactory::fromFile(
+            dirname(__FILE__, 3) . '/resources/xml/ds_SPKISexp.xml',
+        );
+    }
+
+
+    /**
+     */
+    public function testMarshalling(): void
+    {
+        $SPKISexp = new SPKISexp('GpM6');
+
+        $this->assertEquals(
+            self::$xmlRepresentation->saveXML(self::$xmlRepresentation->documentElement),
+            strval($SPKISexp),
+        );
+    }
+}
diff --git a/tests/resources/xml/ds_SPKISexp.xml b/tests/resources/xml/ds_SPKISexp.xml
new file mode 100644
index 00000000..280259b5
--- /dev/null
+++ b/tests/resources/xml/ds_SPKISexp.xml
@@ -0,0 +1 @@
+<ds:SPKISexp xmlns:ds="http://www.w3.org/2000/09/xmldsig#">GpM6</ds:SPKISexp>