void _ossl_old_des_ede3_ofb64_encrypt(unsigned char *in, unsigned char *out,
long length, _ossl_old_des_key_schedule ks1, _ossl_old_des_key_schedule ks2,
_ossl_old_des_key_schedule ks3, _ossl_old_des_cblock *ivec, int *num);
void _ossl_old_des_ede3_ofb64_encrypt(unsigned char *in, unsigned char *out,
long length, _ossl_old_des_key_schedule ks1, _ossl_old_des_key_schedule ks2,
_ossl_old_des_key_schedule ks3, _ossl_old_des_cblock *ivec, int *num);