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