TAI64N ハードウェア実装追加

- SE050 モノトニックカウンタ使用
- リプレイ防止用タイムスタンプ
- テスト実装済み

include/se050_tai64n_hw.h

@@ -0,0 +1,68 @@
+/**
+ * @file se050_tai64n_hw.h
+ * @brief TAI64N using SE050 Hardware Monotonic Counter
+ * 
+ * Uses SE050's built-in monotonic counter for replay prevention.
+ * Object ID: SE05X_OBJ_ID_MONOTONIC_COUNTER (0x7FFF0203)
+ */
+
+#ifndef SE050_TAI64N_HW_H
+#define SE050_TAI64N_HW_H
+
+#include <stdint.h>
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define TAI64N_HW_SIZE 12
+#define SE050_MONOTONIC_COUNTER_ID 0x7FFF0203
+
+/* Session handle type (opaque) */
+typedef void* se050_session_t;
+
+/* Mock session for testing */
+typedef struct {
+    uint32_t counter;
+} mock_session_t;
+
+/**
+ * @brief Read SE050 monotonic counter and encode as TAI64N
+ * @param session SE050 session handle
+ * @param out Output buffer (12 bytes)
+ * @return 0 on success, -1 on error
+ */
+int se050_tai64n_hw_now(void *session, uint8_t out[12]);
+
+/**
+ * @brief Read SE050 monotonic counter only (32-bit)
+ * @param session SE050 session handle
+ * @param counter Output counter value
+ * @return 0 on success, -1 on error
+ */
+int se050_tai64n_hw_read_counter(void *session, uint32_t *counter);
+
+/**
+ * @brief Increment SE050 monotonic counter
+ * @param session SE050 session handle
+ * @return 0 on success, -1 on error
+ */
+int se050_tai64n_hw_increment(void *session);
+
+/**
+ * @brief Check if timestamp is within acceptable window
+ * @param timestamp Received TAI64N timestamp
+ * @param current Current TAI64N timestamp
+ * @param window Acceptable window in seconds
+ * @return 1 if valid, 0 if expired/replay, -1 on error
+ */
+int se050_tai64n_hw_check_window(const uint8_t timestamp[12],
+                                 const uint8_t current[12],
+                                 uint32_t window);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* SE050_TAI64N_HW_H */