C++ (Cpp) mix_column Examples

Example #1

File: 8192cd_aes.c Project: froggatt/edimax-br-6528n

void aes128k128d(unsigned char *key, unsigned char *data, unsigned char *ciphertext)
{
    int round;
    int i;
    unsigned char intermediatea[16];
    unsigned char intermediateb[16];
    unsigned char round_key[16];

    for(i=0; i<16; i++) round_key[i] = key[i];

    for (round = 0; round < 11; round++)
    {
        if (round == 0)
        {
            xor_128(round_key, data, ciphertext);
            next_key(round_key, round);
        }
        else if (round == 10)
        {
            byte_sub(ciphertext, intermediatea);
            shift_row(intermediatea, intermediateb);
            xor_128(intermediateb, round_key, ciphertext);
        }
        else    /* 1 - 9 */
        {
            byte_sub(ciphertext, intermediatea);
            shift_row(intermediatea, intermediateb);
            mix_column(&intermediateb[0], &intermediatea[0]);
            mix_column(&intermediateb[4], &intermediatea[4]);
            mix_column(&intermediateb[8], &intermediatea[8]);
            mix_column(&intermediateb[12], &intermediatea[12]);
            xor_128(intermediatea, round_key, ciphertext);
            next_key(round_key, round);
        }
    }

}

Example #2

File: aes.c Project: krautchan/kryo-chief

static void mix_columns(uint8_t *state, int mode) {
	int i, j;
	uint8_t column[4];

	for(i = 0; i < NB; i++) {
		for(j = 0; j < 4; j++)
			column[j] = state[4 * j + i];

		if(mode == FOR_MIX)
			mix_column(column);
		else
			inv_mix_column(column);

		for(j = 0; j < 4; j++)
			state[4 * j + i] = column[j];
	}
}