Xmega Application Note | |||||
This file contains an example application that demonstrates the AES driver using back to back polled functions.
Copyright (c) 2008, Atmel Corporation All rights reserved.
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Definition in file AES_example_backtoback.c.
#include "avr_compiler.h"
#include "AES_driver.h"
Go to the source code of this file.
Defines | |
#define | BLOCK_COUNT 3 |
#define | BLOCK_LENGTH 16 |
Functions | |
int | main (void) |
Variables | |
uint8_t | data1 [BLOCK_LENGTH] |
uint8_t | data2 [BLOCK_LENGTH] |
uint8_t | key [BLOCK_LENGTH] |
uint8_t | lastsubkey [BLOCK_LENGTH] |
uint8_t | read_key [BLOCK_LENGTH] |
uint8_t | single_ans1 [BLOCK_LENGTH] |
uint8_t | single_ans2 [BLOCK_LENGTH] |
bool | success |
#define BLOCK_COUNT 3 |
#define BLOCK_LENGTH 16 |
int main | ( | void | ) |
Definition at line 79 of file AES_example_backtoback.c.
References AES_decrypt_backtoback(), AES_encrypt(), AES_encrypt_backtoback(), AES_software_reset, BLOCK_LENGTH, data1, data2, key, single_ans1, single_ans2, and success.
00080 { 00081 /* Assume that everything is ok*/ 00082 success = true; 00083 00084 /* Before using the AES it is recommended to do an AES software reset to put 00085 * the module in known state, in case other parts of your code has accessed 00086 * the AES module. */ 00087 AES_software_reset(); 00088 00089 /* Do AES encryption and decryption every other time with the same key on 00090 * two data blocks. */ 00091 success = AES_encrypt(data1, single_ans1, key); 00092 success = AES_decrypt_backtoback(single_ans1, single_ans1); 00093 success = AES_encrypt_backtoback(data2, single_ans2); 00094 success = AES_decrypt_backtoback(single_ans2, single_ans2); 00095 00096 /* Check if decrypted answers is equal to plaintext. */ 00097 for(uint8_t i = 0; i < BLOCK_LENGTH ; i++ ){ 00098 if (data1[i] != single_ans1[i]){ 00099 success = false; 00100 } 00101 if (data2[i] != single_ans2[i]){ 00102 success = false; 00103 } 00104 } 00105 00106 if(success){ 00107 while(true){ 00108 /* If the example ends up here every thing is ok. */ 00109 nop(); 00110 } 00111 }else{ 00112 while(true){ 00113 /* If the example ends up here something is wrong. */ 00114 nop(); 00115 } 00116 } 00117 }
uint8_t data1[BLOCK_LENGTH] |
Initial value:
{0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16}
Definition at line 57 of file AES_example_backtoback.c.
Referenced by main().
uint8_t data2[BLOCK_LENGTH] |
Initial value:
{0xAA, 0xAA, 0xAA, 0xBB, 0xBB, 0xBB, 0xCC, 0xCC, 0xCC, 0xDD, 0xDD, 0xDD, 0xEE, 0xEE, 0xEE, 0x0F}
Definition at line 60 of file AES_example_backtoback.c.
Referenced by main().
uint8_t key[BLOCK_LENGTH] |
Initial value:
{0x94, 0x74, 0xB8, 0xE8, 0xC7, 0x3B, 0xCA, 0x7D, 0x28, 0x34, 0x76, 0xAB, 0x38, 0xCF, 0x37, 0xC2}
Definition at line 68 of file AES_example_backtoback.c.
Referenced by main().
uint8_t lastsubkey[BLOCK_LENGTH] |
uint8_t read_key[BLOCK_LENGTH] |
Definition at line 73 of file AES_example_backtoback.c.
uint8_t single_ans1[BLOCK_LENGTH] |
uint8_t single_ans2[BLOCK_LENGTH] |
bool success |
Generated on Wed Apr 23 08:53:41 2008 for AVR1318 Using the XMEGA built in AES accelerator by ![]() |