3 * \brief XTEA implemantation
4 * copy'n'pasted from http://en.wikipedia.org/wiki/XTEA
5 * and slightly modified
11 void xtea_enc(uint32_t* dest, uint32_t* v, uint32_t* k) {
12 uint32_t v0=v[0], v1=v[1], i;
13 uint32_t sum=0, delta=0x9E3779B9;
15 v0 += ((v1 << 4 ^ v1 >> 5) + v1) ^ (sum + k[sum & 3]);
17 v1 += ((v0 << 4 ^ v0 >> 5) + v0) ^ (sum + k[sum>>11 & 3]);
19 dest[0]=v0; dest[1]=v1;
22 void xtea_dec(uint32_t* dest, uint32_t* v, uint32_t* k) {
23 uint32_t v0=v[0], v1=v[1], i;
24 uint32_t sum=0xC6EF3720, delta=0x9E3779B9;
26 v1 -= ((v0 << 4 ^ v0 >> 5) + v0) ^ (sum + k[sum>>11 & 3]);
28 v0 -= ((v1 << 4 ^ v1 >> 5) + v1) ^ (sum + k[sum & 3]);
30 dest[0]=v0; dest[1]=v1;