3.8.1.1.3 Workflow

  1. Define sample data from NIST-800-38A appendix F for ECB mode. 
    #define AES_EXAMPLE_REFBUF_SIZE 4

/* @{ */
uint32_t ref_plain_text[AES_EXAMPLE_REFBUF_SIZE] = {
    0xe2bec16b,
    0x969f402e,
    0x117e3de9,
    0x2a179373
};

uint32_t ref_cipher_text_ecb[AES_EXAMPLE_REFBUF_SIZE] = {
    0xb47bd73a,
    0x60367a0d,
    0xf3ca9ea8,
    0x97ef6624
};

const uint32_t key128[4] = {
    0x16157e2b,
    0xa6d2ae28,
    0x8815f7ab,
    0x3c4fcf09
};
/* @} */
  2. Create related module variable and software instance structure. 
    /* Output data array */
static uint32_t output_data[AES_EXAMPLE_REFBUF_SIZE];

/* State indicate */
volatile bool state = false;
/* AES configuration */
struct aes_config g_aes_cfg;
/* AES instance*/
struct aes_module aes_instance;
struct usart_module usart_instance;
  3. Configure, initialize, and enable AES module.
    1. Configuration AES struct, which can be filled out to adjust the configuration of a physical AES peripheral. 
      aes_get_config_defaults(&g_aes_cfg);
    2. Initialize the AES configuration struct with the module's default values. 
      aes_init(&aes_instance,AES, &g_aes_cfg);
    3. Enable the AES module. 
      aes_enable(&aes_instance);