des_example.c File Reference

AVR XMEGA Data Encryption Standard (DES) driver.

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

#include <asf.h>

Macros
#define	DES_BLOCK_COUNT   3
	AES data block count. More...
#define	DES_BLOCK_LENGTH   8
	AES data, key block length. More...

Functions
int	main (void)
	Main example doing DES encryption/decryption. More...

Variables
uint8_t	block_ans [DES_BLOCK_LENGTH *DES_BLOCK_COUNT]
	Variable used to store decrypted plaintext from DES Cipher Block Chaining. More...
uint8_t	cipher_block_ans [DES_BLOCK_LENGTH *DES_BLOCK_COUNT]
	Variable used to store ciphertext from DES Cipher Block Chaining. More...
uint8_t	data [DES_BLOCK_LENGTH]
	Plaintext block used by DES and 3DES. More...
uint8_t	data_block [DES_BLOCK_LENGTH *DES_BLOCK_COUNT]
	Plain text used during DES Cipher Block Chaining. More...
uint8_t	init [DES_BLOCK_LENGTH]
	Initial vector used during DES Cipher Block Chaining. More...
uint8_t	keys [DES_BLOCK_LENGTH *DES_BLOCK_COUNT]
	Keys used by all DES operations. More...
uint8_t	single_ans [DES_BLOCK_LENGTH]
	Variable used to store DES and tripleDES results. More...

#define DES_BLOCK_COUNT   3

AES data block count.

Referenced by main().

#define DES_BLOCK_LENGTH   8

AES data, key block length.

Referenced by main().

int main

(

void

)

Main example doing DES encryption/decryption.

References block_ans, board_init(), cipher_block_ans, data, data_block, des_3des_decrypt(), des_3des_encrypt(), DES_BLOCK_COUNT, DES_BLOCK_LENGTH, des_cbc_decrypt(), des_cbc_encrypt(), des_decrypt(), des_encrypt(), init, ioport_set_pin_low(), keys, LED0_GPIO, LED1_GPIO, single_ans, sleepmgr_enter_sleep(), and sleepmgr_init().

uint8_t block_ans[DES_BLOCK_LENGTH *DES_BLOCK_COUNT]

Variable used to store decrypted plaintext from DES Cipher Block Chaining.

Note

It is not possible to use the same variable to store the plaintext after a Cipher Block Chaining operation, as the previous cipher block is used to decode the current data block.

Referenced by main().

uint8_t cipher_block_ans[DES_BLOCK_LENGTH *DES_BLOCK_COUNT]

Variable used to store ciphertext from DES Cipher Block Chaining.

Referenced by main().

uint8_t data[DES_BLOCK_LENGTH]

Initial value:

= {
        0xAB, 0xBA, 0x00, 0xBE, 0xEF, 0x00, 0xDE, 0xAD}

Plaintext block used by DES and 3DES.

Note

The MSB in the block is byte 0, and LSB is byte 7.

Referenced by main().

uint8_t data_block[DES_BLOCK_LENGTH *DES_BLOCK_COUNT]

Initial value:

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

Plain text used during DES Cipher Block Chaining.

Referenced by main().

uint8_t init[DES_BLOCK_LENGTH]

Initial value:

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

Initial vector used during DES Cipher Block Chaining.

Referenced by main().

uint8_t keys[DES_BLOCK_LENGTH *DES_BLOCK_COUNT]

Initial value:

= {
        0x94, 0x74, 0xB8, 0xE8, 0xC7, 0x3B, 0xCA, 0x7D,
        0x28, 0x34, 0x76, 0xAB, 0x38, 0xCF, 0x37, 0xC2,
        0xFE, 0x98, 0x6C, 0x38, 0x23, 0xFC, 0x2D, 0x23}

Keys used by all DES operations.

(single DES only uses the first 64-bit key).

Note

The MSB of the 3 keys is byte 0,8 and 16. The LSB of each key is byte 7, 15 and 23.

Referenced by main().

uint8_t single_ans[DES_BLOCK_LENGTH]

Variable used to store DES and tripleDES results.

Referenced by main().