main.c

/*
 * Advanced Encryption Standard
 * @author Dani Huertas
 * @email huertas.dani@gmail.com
 *
 * Based on the document FIPS PUB 197
 */
#include <stdio.h>

#include "aes.h"

int main() {

	uint8_t i;

	/*
	 * Appendix A - Key Expansion Examples
	 */
	 
	/* 128 bits */
	/* uint8_t key[] = {
		0x2b, 0x7e, 0x15, 0x16,
		0x28, 0xae, 0xd2, 0xa6,
		0xab, 0xf7, 0x15, 0x88,
		0x09, 0xcf, 0x4f, 0x3c}; */
	
	/* 192 bits */
	/* uint8_t key[] = {
		0x8e, 0x73, 0xb0, 0xf7,
		0xda, 0x0e, 0x64, 0x52,
		0xc8, 0x10, 0xf3, 0x2b,
		0x80, 0x90, 0x79, 0xe5,
		0x62, 0xf8, 0xea, 0xd2,
		0x52, 0x2c, 0x6b, 0x7b}; */
	
	/* 256 bits */
	/* uint8_t key[] = {
		0x60, 0x3d, 0xeb, 0x10,
		0x15, 0xca, 0x71, 0xbe,
		0x2b, 0x73, 0xae, 0xf0,
		0x85, 0x7d, 0x77, 0x81,
		0x1f, 0x35, 0x2c, 0x07,
		0x3b, 0x61, 0x08, 0xd7,
		0x2d, 0x98, 0x10, 0xa3,
		0x09, 0x14, 0xdf, 0xf4};
	*/
	
	/* uint8_t in[] = {
		0x32, 0x43, 0xf6, 0xa8,
		0x88, 0x5a, 0x30, 0x8d,
		0x31, 0x31, 0x98, 0xa2,
		0xe0, 0x37, 0x07, 0x34}; // 128
	*/

	/*
	 * Appendix C - Example Vectors
	 */

	/* 128 bit key */
	/* uint8_t key[] = {
		0x00, 0x01, 0x02, 0x03, 
		0x04, 0x05, 0x06, 0x07, 
		0x08, 0x09, 0x0a, 0x0b, 
		0x0c, 0x0d, 0x0e, 0x0f}; */
	
	/* 192 bit key */
	/* uint8_t key[] = {
		0x00, 0x01, 0x02, 0x03,
		0x04, 0x05, 0x06, 0x07,
		0x08, 0x09, 0x0a, 0x0b,
		0x0c, 0x0d, 0x0e, 0x0f,
		0x10, 0x11, 0x12, 0x13,
		0x14, 0x15, 0x16, 0x17}; */
	
	/* 256 bit key */
	uint8_t key[] = {
		0x00, 0x01, 0x02, 0x03,
		0x04, 0x05, 0x06, 0x07,
		0x08, 0x09, 0x0a, 0x0b,
		0x0c, 0x0d, 0x0e, 0x0f,
		0x10, 0x11, 0x12, 0x13,
		0x14, 0x15, 0x16, 0x17,
		0x18, 0x19, 0x1a, 0x1b,
		0x1c, 0x1d, 0x1e, 0x1f};

	uint8_t in[] = {
		0x00, 0x11, 0x22, 0x33,
		0x44, 0x55, 0x66, 0x77,
		0x88, 0x99, 0xaa, 0xbb,
		0xcc, 0xdd, 0xee, 0xff};
	
	uint8_t out[16]; // 128

	uint8_t *w; // expanded key

	w = aes_init(sizeof(key));

	aes_key_expansion(key, w);

	printf("Plaintext message:\n");
	for (i = 0; i < 4; i++) {
		printf("%02x %02x %02x %02x ", in[4*i+0], in[4*i+1], in[4*i+2], in[4*i+3]);
	}

	printf("\n");

	aes_cipher(in /* in */, out /* out */, w /* expanded key */);

	printf("Ciphered message:\n");
	for (i = 0; i < 4; i++) {
		printf("%02x %02x %02x %02x ", out[4*i+0], out[4*i+1], out[4*i+2], out[4*i+3]);
	}

	printf("\n");

	aes_inv_cipher(out, in, w);

	printf("Original message (after inv cipher):\n");
	for (i = 0; i < 4; i++) {
		printf("%02x %02x %02x %02x ", in[4*i+0], in[4*i+1], in[4*i+2], in[4*i+3]);
	}

	printf("\n");

	free(w);

	return 0;
}