AES-128 Linux C源码（内核态）

#include <linux/types.h>
#include <linux/skbuff.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/ctype.h>
#include <linux/spinlock.h>

#define AES_BLOCK_SIZE      16
#define AES_ROUNDS          10  // 12, 14
#define AES_ROUND_KEY_SIZE  176 // AES-128 has 10 rounds, and there is a AddRoundKey before first round. (10+1)x16=176.

void aes_key_schedule_128(const uint8_t *key, uint8_t *roundkeys);

void aes_encrypt_128(const uint8_t *roundkeys, const uint8_t *plaintext, uint8_t *ciphertext);

void aes_decrypt_128(const uint8_t *roundkeys, const uint8_t *ciphertext, uint8_t *plaintext);

#include "aes.h"

/*
 * round constants
 */
static uint8_t RC[] = {0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36};

/*
 * Sbox
 */
static uint8_t SBOX[256] = {
    0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b