Changes

NFC adapter (edit)

45 bytes added , 14:28, 4 May 2015

Edited with easier to read code

Line 146: Line 146:

uint16_t * plain = (uint16_t *) voidplain;

uint16_t * cipher = (uint16_t *) voidcipher;

−

size_t halfCount = size / ~~sizeof(uint16_t);~~

+

size_t halfCount = size >> 1; // Divide by 2 rounding towards zero

uint16_t xorval = htobe16(0xE963);

Line 160: Line 160:

uint16_t * cipher = (uint16_t *) voidcipher;

uint16_t * plain = (uint16_t *) voidplain;

−

size_t halfCount = size / ~~sizeof(uint16_t);~~

+

size_t halfCount = size >> 1; // Divide by 2 rounding towards zero

−

if (~~halfCount~~) {

+

uint16_t xorval = htobe16(0xE963);

−

size_t i;

+

size_t i;

−

~~for (i = halfCount - 1; i > 0; i--) {~~

−

~~plain[i] = cipher[i] ^ cipher[i - 1];~~

−

}

−

plain[0] = cipher[0] ^ ~~htobe16(0xE963)~~;

+

for (i = 0; i < halfCount; i++) {

+

uint16_t word = plain[i];

+

cipher[i] = xorval ^ word;

+

xorval = word;

}

}</nowiki>

48

edits