SAML21走起14:先进的加密解密基础

#include <asf.h>

#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

        };

        

/* 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;



static void configure_usart(void);

static void ecb_mode_test(void);

static void configure_usart(void)

{

        struct usart_config config_usart;

        usart_get_config_defaults(&config_usart);

        config_usart.baudrate    = 38400;

        config_usart.mux_setting = EDBG_CDC_SERCOM_MUX_SETTING;

        config_usart.pinmux_pad0 = EDBG_CDC_SERCOM_PINMUX_PAD0;

        config_usart.pinmux_pad1 = EDBG_CDC_SERCOM_PINMUX_PAD1;

        config_usart.pinmux_pad2 = EDBG_CDC_SERCOM_PINMUX_PAD2;

        config_usart.pinmux_pad3 = EDBG_CDC_SERCOM_PINMUX_PAD3;

        stdio_serial_init(&usart_instance, EDBG_CDC_MODULE, &config_usart);

        usart_enable(&usart_instance);

}

static void ecb_mode_test(void)

{

        printf("\r\n-----------------------------------\r\n");

        printf("- 128bit cryptographic key\r\n");

        printf("- ECB cipher mode\r\n");

        printf("- Auto start mode\r\n");

        printf("- 4 32bit words\r\n");

        printf("-----------------------------------\r\n");

        state = false;

        /* Configure the AES. */

        g_aes_cfg.encrypt_mode = AES_ENCRYPTION;

        g_aes_cfg.key_size = AES_KEY_SIZE_128;

        g_aes_cfg.start_mode = AES_AUTO_START;

        g_aes_cfg.opmode = AES_ECB_MODE;

        g_aes_cfg.cfb_size = AES_CFB_SIZE_128;

        g_aes_cfg.lod = false;

        aes_set_config(&aes_instance,AES, &g_aes_cfg);

        /* Set the cryptographic key. */

        aes_write_key(&aes_instance, key128);

        /* The initialization vector is not used by the ECB cipher mode. */

        aes_set_new_message(&aes_instance);

        /* Write the data to be ciphered to the input data registers. */

        aes_write_input_data(&aes_instance, ref_plain_text);

        aes_clear_new_message(&aes_instance);

        /* Wait for the end of the encryption process. */

        while (!(aes_get_status(&aes_instance) & AES_ENCRYPTION_COMPLETE)) {

        }

        aes_read_output_data(&aes_instance,output_data);

        if ((ref_cipher_text_ecb[0] != output_data[0]) ||

        (ref_cipher_text_ecb[1] != output_data[1]) ||

        (ref_cipher_text_ecb[2] != output_data[2]) ||

        (ref_cipher_text_ecb[3] != output_data[3])) {

                printf("\r\nKO!!!\r\n");

                } else {

                printf("\r\nOK!!!\r\n");

        }

        printf("\r\n-----------------------------------\r\n");

        printf("- 128bit cryptographic key\r\n");

        printf("- ECB decipher mode\r\n");

        printf("- Auto start mode\r\n");

        printf("- 4 32bit words\r\n");

        printf("-----------------------------------\r\n");

        state = false;

        /* Configure the AES. */

        g_aes_cfg.encrypt_mode = AES_DECRYPTION;

        g_aes_cfg.key_size = AES_KEY_SIZE_128;

        g_aes_cfg.start_mode = AES_AUTO_START;

        g_aes_cfg.opmode = AES_ECB_MODE;

        g_aes_cfg.cfb_size = AES_CFB_SIZE_128;

        g_aes_cfg.lod = false;

        aes_set_config(&aes_instance,AES, &g_aes_cfg);

        /* Set the cryptographic key. */

        aes_write_key(&aes_instance, key128);

        /* The initialization vector is not used by the ECB cipher mode. */

        /* Write the data to be deciphered to the input data registers. */

        aes_write_input_data(&aes_instance, ref_cipher_text_ecb);

        /* Wait for the end of the decryption process. */

        while (!(aes_get_status(&aes_instance) & AES_ENCRYPTION_COMPLETE)) {

        }

        aes_read_output_data(&aes_instance,output_data);

        /* check the result. */

        if ((ref_plain_text[0] != output_data[0]) ||

        (ref_plain_text[1] != output_data[1]) ||

        (ref_plain_text[2] != output_data[2]) ||

        (ref_plain_text[3] != output_data[3])) {

                printf("\r\nKO!!!\r\n");

                } else {

                printf("\r\nOK!!!\r\n");

        }

}





int main (void)

{

        

          /* Initialize the system and console*/

      system_init();

      configure_usart();

      aes_get_config_defaults(&g_aes_cfg);

      aes_init(&aes_instance,AES, &g_aes_cfg);

      aes_enable(&aes_instance);

          

          ecb_mode_test();

        

}