Mudr-209 Apr 2026

if (len > PAYLOAD_MAX) return; // guard assemble_record(payload, len); protect_record(); persist_record(); update_merkle();

/* AES‑GCM‑256 encryption + authentication tag */ aes_gcm_encrypt(SE_KEY_LOG, record_buf, sizeof(mudr209_hdr_t)+hdr->payload_sz, record_buf); // in‑place encrypt MUDR-209

flash_append(record_buf, sizeof(mudr209_hdr_t)+hdr->payload_sz); if (len &gt

static uint8_t record_buf[RECORD_MAX]; static uint32_t record_seq = 0; // guard assemble_record(payload

/* 1. Prepare header --------------------------------------------------------*/ static void build_header(mudr209_hdr_t *hdr, uint32_t payload_len)

/* 5. Update Merkle tree ----------------------------------------------------*/ static void update_merkle(void)