#define ROTTABLE_INV 0x3F7E
/******************************************************************************/
-void permute(uint8_t *ptable, const uint8_t *in, uint8_t *out){
- uint8_t ib, ob; /* in-bytes and out-bytes */
+void permute(const uint8_t *ptable, const uint8_t *in, uint8_t *out){
+ uint8_t ob; /* in-bytes and out-bytes */
uint8_t byte, bit; /* counter for bit and byte */
- ib = ptable[0];
ob = ptable[1];
ptable = &(ptable[2]);
for(byte=0; byte<ob; ++byte){
/******************************************************************************/
void des_enc(void* out, const void* in, const void* key){
-#define R *((uint32_t*)&(data[4]))
-#define L *((uint32_t*)&(data[0]))
+#define R (data.v32[1])
+#define L (data.v32[0])
- uint8_t data[8],kr[6],k[7];
+ uint8_t kr[6],k[7];
uint8_t i;
+ union {
+ uint8_t v8[8];
+ uint32_t v32[2];
+ } data;
- permute((uint8_t*)ip_permtab, (uint8_t*)in, data);
+ permute((uint8_t*)ip_permtab, (uint8_t*)in, data.v8);
permute((uint8_t*)pc1_permtab, (const uint8_t*)key, k);
for(i=0; i<8; ++i){
shiftkey(k);
R ^= L;
L ^= R;
R ^= L;
-
- permute((uint8_t*)inv_ip_permtab, data, (uint8_t*)out);
+ permute((uint8_t*)inv_ip_permtab, data.v8, (uint8_t*)out);
}
/******************************************************************************/
void des_dec(void* out, const void* in, const uint8_t* key){
-#define R *((uint32_t*)&(data[4]))
-#define L *((uint32_t*)&(data[0]))
-
- uint8_t data[8],kr[6],k[7];
+ uint8_t kr[6],k[7];
+ union {
+ uint8_t v8[8];
+ uint32_t v32[2];
+ } data;
int8_t i;
- permute((uint8_t*)ip_permtab, (uint8_t*)in, data);
+ permute((uint8_t*)ip_permtab, (uint8_t*)in, data.v8);
permute((uint8_t*)pc1_permtab, (const uint8_t*)key, k);
for(i=7; i>=0; --i){
R ^= L;
L ^= R;
R ^= L;
-
- permute((uint8_t*)inv_ip_permtab, data, (uint8_t*)out);
+ permute((uint8_t*)inv_ip_permtab, data.v8, (uint8_t*)out);
}
/******************************************************************************/