aes_example3.c File Reference

AVR XMEGA Advanced Encryption Standard (AES) example.

Copyright (c) 2010-2018 Microchip Technology Inc. and its subsidiaries.

#include <string.h>
#include <asf.h>

Macros
#define	BLOCK_LENGTH   16
	AES data, key block length. More...
#define	DMA_CHANNEL_N   0
	DMA channel used. More...

Functions
static void	aes_dma_input (void)
	Access AES module with DMA support. More...
static void	aes_dma_output (void)
	Access AES module with DMA support. More...
int	main (void)

Variables
uint8_t	cipher_text [BLOCK_LENGTH]
	Cipher result from FIPS-197 = 69c4e0d8 6a7b0430 d8cdb780 70b4c55a. More...
struct dma_channel_config	config
	DMA channel configuration. More...
uint8_t	init [BLOCK_LENGTH]
	Initialization vector used during Cipher Block Chaining (CBC). More...
uint8_t	key [BLOCK_LENGTH]
	Key from FIPS-197 = 00010203 04050607 08090A0B 0C0D0E0. More...
uint8_t	lastsubkey [BLOCK_LENGTH]
	Key used when the AES shall decrypt. More...
uint8_t	plain_text [BLOCK_LENGTH]
	Plaintext from FIPS-197 = 00112233 44556677 8899AABB CCDDEEFF. More...
uint8_t	single_ans [BLOCK_LENGTH]
	Variable used to store the result from a single AES encryption/decryption. More...
bool	success
	Variable used to check AES results. More...

#define BLOCK_LENGTH   16

AES data, key block length.

Referenced by aes_dma_input(), aes_dma_output(), and main().

#define DMA_CHANNEL_N   0

DMA channel used.

Referenced by aes_dma_input(), and aes_dma_output().

static void aes_dma_input ( void  )

static

Access AES module with DMA support.

Note

Set KEY and write STATE using DMA channel 0. Check DMA driver example for more information about DMA usage.

References BLOCK_LENGTH, config, dma_channel_enable(), DMA_CHANNEL_N, dma_channel_set_burst_length(), dma_channel_set_dest_dir_mode(), dma_channel_set_dest_reload_mode(), dma_channel_set_destination_address(), dma_channel_set_source_address(), dma_channel_set_src_dir_mode(), dma_channel_set_src_reload_mode(), dma_channel_set_transfer_count(), dma_channel_trigger_block_transfer(), dma_channel_write_config(), dma_enable(), key, and plain_text.

Referenced by main().

static void aes_dma_output ( void  )

static

Access AES module with DMA support.

Note

Read STATE using DMA channel 0. Check DMA driver example for more information about DMA usage.

References BLOCK_LENGTH, config, dma_channel_enable(), DMA_CHANNEL_N, dma_channel_set_burst_length(), dma_channel_set_dest_dir_mode(), dma_channel_set_dest_reload_mode(), dma_channel_set_destination_address(), dma_channel_set_source_address(), dma_channel_set_src_dir_mode(), dma_channel_set_src_reload_mode(), dma_channel_set_transfer_count(), dma_channel_trigger_block_transfer(), dma_channel_write_config(), dma_disable(), dma_enable(), and single_ans.

Referenced by main().

int main

(

void

)

References aes_configure(), aes_dma_input(), aes_dma_output(), AES_ENCRYPT, AES_INTLVL_OFF, aes_is_busy(), aes_is_error(), aes_isr_configure(), AES_MANUAL, aes_software_reset(), aes_start(), AES_XOR_OFF, BLOCK_LENGTH, board_init(), cipher_text, ioport_set_pin_low(), single_ans, sleepmgr_enter_sleep(), sleepmgr_init(), success, SYSCLK_AES, sysclk_disable_module(), sysclk_enable_module(), sysclk_init(), and SYSCLK_PORT_GEN.

uint8_t cipher_text[BLOCK_LENGTH]

Initial value:

= {
        0x69, 0xc4, 0xe0, 0xd8, 0x6a, 0x7b, 0x04, 0x30,
        0xd8, 0xcd, 0xb7, 0x80, 0x70, 0xb4, 0xc5, 0x5a}

Cipher result from FIPS-197 = 69c4e0d8 6a7b0430 d8cdb780 70b4c55a.

struct dma_channel_config config

DMA channel configuration.

Referenced by aes_dma_input(), and aes_dma_output().

uint8_t init[BLOCK_LENGTH]

Initial value:

= {
        0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88,
        0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88}

Initialization vector used during Cipher Block Chaining (CBC).

uint8_t key[BLOCK_LENGTH]

Initial value:

= {
        0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
        0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F}

Key from FIPS-197 = 00010203 04050607 08090A0B 0C0D0E0.

uint8_t lastsubkey[BLOCK_LENGTH]

Key used when the AES shall decrypt.

This last subkey is a modified version of the key.

uint8_t plain_text[BLOCK_LENGTH]

Initial value:

= {
        0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
        0x88, 0x99, 0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF}

Plaintext from FIPS-197 = 00112233 44556677 8899AABB CCDDEEFF.

uint8_t single_ans[BLOCK_LENGTH]

Variable used to store the result from a single AES encryption/decryption.

bool success

Variable used to check AES results.