SMC_CLKM_LEN
uint8_t data[SMC_CLKM_LEN];
error = aplsmc_read_key(sc, SMC_KEY("CLKM"), &data, SMC_CLKM_LEN);
error = aplsmc_read_key(sc, SMC_KEY("CLKM"), &data, SMC_CLKM_LEN);
error = aplsmc_read_key(sc, SMC_KEY("CLKM"), &data, SMC_CLKM_LEN);