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#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include "crypt_des.h"
static struct expanded_key __encrypt_key;
void setkey(const char *key)
{
unsigned char bkey[8];
int i, j;
for (i = 0; i < 8; i++) {
bkey[i] = 0;
for (j = 7; j >= 0; j--, key++)
bkey[i] |= (uint32_t)(*key & 1) << j;
}
__des_setkey(bkey, &__encrypt_key);
}
void encrypt(char *block, int edflag)
{
struct expanded_key decrypt_key, *key;
uint32_t b[2];
int i, j;
char *p;
p = block;
for (i = 0; i < 2; i++) {
b[i] = 0;
for (j = 31; j >= 0; j--, p++)
b[i] |= (uint32_t)(*p & 1) << j;
}
key = &__encrypt_key;
if (edflag) {
key = &decrypt_key;
for (i = 0; i < 16; i++) {
decrypt_key.l[i] = __encrypt_key.l[15-i];
decrypt_key.r[i] = __encrypt_key.r[15-i];
}
}
__do_des(b[0], b[1], b, b + 1, 1, 0, key);
p = block;
for (i = 0; i < 2; i++)
for (j = 31; j >= 0; j--)
*p++ = b[i]>>j & 1;
}
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