void encryptCBC(const uint8_t *in, uint8_t *out, int length);
void decryptCBC(const uint8_t *in, uint8_t *out, int length);
void convertKey();
void encryptCBC(const uint8_t *in, uint8_t *out, int length);
void decryptCBC(const uint8_t *in, uint8_t *out, int length);
void convertKey();