Function SubBytes

AES-decrypt.cpp:90–94

Perform substitution to each of the 16 bytes * Uses inverse S-box as lookup table */

 * Uses inverse S-box as lookup table
 */
void SubBytes(unsigned char * state) {
	for (int i = 0; i < 16; i++) { // Perform substitution to each of the 16 bytes
		state[i] = inv_s[state[i]];
	}
}

/* Each round operates on 128 bits at a time
 * The number of rounds is defined in AESDecrypt()