1 files changed, 32 insertions, 0 deletions
diff --git a/matrix-specification/Data/KeyObject.php b/matrix-specification/Data/KeyObject.php
new file mode 100644
index 0000000..120350c
--- /dev/null
+++ b/matrix-specification/Data/KeyObject.php
@@ -0,0 +1,32 @@
+<?php
+
+namespace Matrix\Data;
+
+class KeyObject implements \JsonSerializable
+{
+  /**
+   * @param array<string, array> $signatures
+   */
+  public function __construct(
+    private string $key,
+    private array $signatures,
+    private bool $isFallback = false,
+  )
+  {}
+
+  public function jsonSerialize(): array
+  {
+    $keyObject = [
+      "key" => $this->key,
+      "signatures" => $this->signatures,
+    ];
+
+    if ($this->isFallback) {
+      $keyObject += [
+        "fallback" => true,
+      ];
+    }
+
+    return $keyObject;
+  }
+}