DES_cbc_cksum
DES_LONG DES_cbc_cksum(const unsigned char *input, DES_cblock *output,
LCRYPTO_ALIAS(DES_cbc_cksum);
DES_cbc_cksum((const unsigned char *)str, key, length, &ks, key);
DES_cbc_cksum((const unsigned char *)str, key1, length, &ks, key1);
DES_cbc_cksum((const unsigned char *)str, key2, length, &ks, key2);
LCRYPTO_USED(DES_cbc_cksum);
cs=DES_cbc_cksum(cbc_data,&cret,strlen((char *)cbc_data),&ks,&cbc_iv);