forked from KolibriOS/kolibrios
2e992f24ea
- Compressed kos32-tcc - Changed the paths of the output files in buid_all.sh git-svn-id: svn://kolibrios.org@8251 a494cfbc-eb01-0410-851d-a64ba20cac60
63 lines
1.4 KiB
C
63 lines
1.4 KiB
C
|
|
#include <stdint.h>
|
|
|
|
void TEA_encrypt (uint32_t block[2], uint32_t key[4])
|
|
{
|
|
/* set up */
|
|
uint32_t v0 = block[0];
|
|
uint32_t v1 = block[1];
|
|
uint32_t sum = 0;
|
|
uint32_t i;
|
|
|
|
/* a key schedule constant */
|
|
uint32_t delta = 0x9e3779b9;
|
|
|
|
/* cache key */
|
|
uint32_t k0 = key[0];
|
|
uint32_t k1 = key[1];
|
|
uint32_t k2 = key[2];
|
|
uint32_t k3 = key[3];
|
|
|
|
/* basic cycle start */
|
|
for (i = 0; i < 32; i++)
|
|
{
|
|
sum += delta;
|
|
v0 += ((v1 << 4) + k0) ^ (v1 + sum) ^ ((v1 >> 5) + k1);
|
|
v1 += ((v0 << 4) + k2) ^ (v0 + sum) ^ ((v0 >> 5) + k3);
|
|
}
|
|
/* end cycle */
|
|
|
|
block[0] = v0;
|
|
block[1] = v1;
|
|
}
|
|
|
|
void TEA_decrypt (uint32_t* block, uint32_t* key)
|
|
{
|
|
/* set up */
|
|
uint32_t v0 = block[0];
|
|
uint32_t v1 = block[1];
|
|
uint32_t sum = 0xC6EF3720;
|
|
uint32_t i;
|
|
|
|
/* a key schedule constant */
|
|
uint32_t delta = 0x9e3779b9;
|
|
|
|
/* cache key */
|
|
uint32_t k0 = key[0];
|
|
uint32_t k1 = key[1];
|
|
uint32_t k2 = key[2];
|
|
uint32_t k3 = key[3];
|
|
|
|
/* basic cycle start */
|
|
for (i = 0; i < 32; i++)
|
|
{
|
|
v1 -= ((v0 << 4) + k2) ^ (v0 + sum) ^ ((v0 >> 5) + k3);
|
|
v0 -= ((v1 << 4) + k0) ^ (v1 + sum) ^ ((v1 >> 5) + k1);
|
|
sum -= delta;
|
|
}
|
|
/* end cycle */
|
|
|
|
block[0] = v0;
|
|
block[1] = v1;
|
|
}
|