9x Ex 5x 6x Ax 2x 3x Cx Fx 0x 4x Dx 7x Bx 1x 8x
*/
-static uint8_t pq_lut[16] PROGMEM = {
+static const uint8_t pq_lut[16] PROGMEM = {
0x39, 0xFE, 0xE5, 0x06, 0x5A, 0x42, 0xB3, 0xCC,
0xDF, 0xA0, 0x94, 0x6D, 0x77, 0x8B, 0x21, 0x18
};
* 07x 0Bx 08x 06x 05x 04x 03x 01x
*/
-static uint8_t h[8][4] PROGMEM = {
+static const uint8_t h[8][4] PROGMEM = {
{ 0x13, 0x45, 0x68, 0xB7 },
{ 0x31, 0x54, 0x86, 0x7B },
{ 0x45, 0x13, 0xB7, 0x68 },