PORT_Memset(key, 0, 4);
pk11_XORHash(unsigned char *key, unsigned char *dbkey, int len){   int i;   for (i=0; i < len-4; i += 4) {	key[0] ^= dbkey[i];	key[1] ^= dbkey[i+1];	key[2] ^= dbkey[i+2];	key[3] ^= dbkey[i+3];   }}