DES_quad_cksum
DES_LONG DES_quad_cksum(const unsigned char *input, DES_cblock output[],
LCRYPTO_ALIAS(DES_quad_cksum);
LCRYPTO_USED(DES_quad_cksum);
cs=DES_quad_cksum(cbc_data,(DES_cblock *)lqret,