在ARM处理器上实现AES加密可以采用硬件加速的方式。例如，使用ARMv8指令集中的AES指令进行加密操作，这样可以获得更高的加密效率。以下为使用ARMv8指令集中AES指令进行加密的示例代码：

#include 

void AES_encrypt(const uint8_t *in, uint8_t *out, const AES_KEY *key) 
{
    uint8x16_t in_block, out_block;
    uint8x16_t round_key[15];

    /* load round keys */
    round_key[0] = vld1q_u8(key->rd_key);
    round_key[1] = vld1q_u8(key->rd_key + 16);
    round_key[2] = vld1q_u8(key->rd_key + 32);
    round_key[3] = vld1q_u8(key->rd_key + 48);
    round_key[4] = vld1q_u8(key->rd_key + 64);
    round_key[5] = vld1q_u8(key->rd_key + 80);
    round_key[6] = vld1q_u8(key->rd_key + 96);
    round_key[7] = vld1q_u8(key->rd_key + 112);
    round_key[8] = vld1q_u8(key->rd_key + 128);
    round_key[9] = vld1q_u8(key->rd_key + 144);
    round_key[10] = vld1q_u8(key->rd_key + 160);
    round_key[11] = vld1q_u8(key->rd_key + 176);
    round_key[12] = vld1q_u8(key->rd_key + 192);
    round_key[13] = vld1q_u8(key->rd_key + 208);
    round_key[14] = vld1q_u8(key->rd_key + 224);

    /* load input block */
    in_block = vld1q_u8(in);

    /* first round */
    out_block = vaesmcq_u8(vaeseq_u8(in_block, round_key[0]));

    /* next 13 rounds */
    out_block = vaesmcq_u8(vaeseq_u8(out_block, round_key[1]));
    out_block = vaesmcq_u8(vaeseq_u8(out_block, round_key[2]));
    out_block = vaesmcq_u8(vaeseq_u8(out_block, round_key[3]));
    out