mit_des_zeroblock
&xorkey, (unsigned char*) mit_des_zeroblock, 1);
&xorkey, (unsigned char*) mit_des_zeroblock, 0);
const mit_des_cblock mit_des_zeroblock = {0, 0, 0, 0, 0, 0, 0, 0};
(unsigned char *)mit_des_zeroblock, encrypt);
ivec?(unsigned char *)ivec->data:(unsigned char *)mit_des_zeroblock,
zero_ivec.data = (char *)mit_des_zeroblock;
zero_ivec.length = sizeof(mit_des_zeroblock);
&newkey, (unsigned char*) mit_des_zeroblock, 1);
&newkey, (unsigned char*) mit_des_zeroblock, 0);
extern const mit_des_cblock mit_des_zeroblock;