diff --git a/api_key.go b/api_key.go
new file mode 100644
index 0000000..80e6f8c
--- /dev/null
+++ b/api_key.go
@@ -0,0 +1,15 @@
+package xyshanghai
+
+// APIKey 存储SM4密钥和SM3盐值
+type APIKey struct {
+	SM4Key []byte
+	SM3Salt []byte
+}
+
+// NewAPIKey 创建APIKey实例
+func NewAPIKey(sm4Key, sm3Salt []byte) *APIKey {
+	return &APIKey{
+		SM4Key:  sm4Key,
+		SM3Salt: sm3Salt,
+	}
+}
\ No newline at end of file