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    use libc::*;

    use *;

    pub const X509_FILETYPE_PEM: c_int = 1;
    pub const X509_FILETYPE_ASN1: c_int = 2;
    pub const X509_FILETYPE_DEFAULT: c_int = 3;

    #[repr(C)]
    pub struct X509_VAL {
        pub notBefore: *mut ASN1_TIME,
        pub notAfter: *mut ASN1_TIME,
    }

    pub enum X509_NAME_ENTRY {}

    stack!(stack_st_X509_NAME);

    pub enum X509_EXTENSION {}

    stack!(stack_st_X509_EXTENSION);

    stack!(stack_st_X509_ATTRIBUTE);

    cfg_if! {
        if #[cfg(ossl110)] {
            pub enum X509_REQ_INFO {}
        } else {
            #[repr(C)]
            pub struct X509_REQ_INFO {
                pub enc: ASN1_ENCODING,
                pub version: *mut ::ASN1_INTEGER,
                pub subject: *mut ::X509_NAME,
                pubkey: *mut c_void,
                pub attributes: *mut stack_st_X509_ATTRIBUTE,
            }
        }
    }

    cfg_if! {
        if #[cfg(ossl110)] {
            pub enum X509_CRL {}
        } else {
            #[repr(C)]
            pub struct X509_CRL {
                pub crl: *mut X509_CRL_INFO,
                sig_alg: *mut X509_ALGOR,
                signature: *mut c_void,
                references: c_int,
                flags: c_int,
                akid: *mut c_void,
                idp: *mut c_void,
                idp_flags: c_int,
                idp_reasons: c_int,
                crl_number: *mut ASN1_INTEGER,
                base_crl_number: *mut ASN1_INTEGER,
                sha1_hash: [c_uchar; 20],
                issuers: *mut c_void,
                meth: *const c_void,
                meth_data: *mut c_void,
            }
        }
    }

    stack!(stack_st_X509_CRL);

    cfg_if! {
        if #[cfg(ossl110)] {
            pub enum X509_CRL_INFO {}
        } else {
            #[repr(C)]
            pub struct X509_CRL_INFO {
                version: *mut ASN1_INTEGER,
                sig_alg: *mut X509_ALGOR,
                pub issuer: *mut X509_NAME,
                pub lastUpdate: *mut ASN1_TIME,
                pub nextUpdate: *mut ASN1_TIME,
                pub revoked: *mut stack_st_X509_REVOKED,
                extensions: *mut stack_st_X509_EXTENSION,
                enc: ASN1_ENCODING,
            }
        }
    }

    cfg_if! {
        if #[cfg(ossl110)] {
            pub enum X509_REVOKED {}
        } else {
            #[repr(C)]
            pub struct X509_REVOKED {
                pub serialNumber: *mut ASN1_INTEGER,
                pub revocationDate: *mut ASN1_TIME,
                pub extensions: *mut stack_st_X509_EXTENSION,
                issuer: *mut stack_st_GENERAL_NAME,
                reason: c_int,
                sequence: c_int,
            }
        }
    }

    stack!(stack_st_X509_REVOKED);

    cfg_if! {
        if #[cfg(ossl110)] {
            pub enum X509_REQ {}
        } else {
            #[repr(C)]
            pub struct X509_REQ {
                pub req_info: *mut X509_REQ_INFO,
                sig_alg: *mut c_void,
                signature: *mut c_void,
                references: c_int,
            }
        }
    }

    cfg_if! {
        if #[cfg(ossl110)] {
            pub enum X509_CINF {}
        } else {
            #[repr(C)]
            pub struct X509_CINF {
                version: *mut c_void,
                serialNumber: *mut c_void,
                signature: *mut c_void,
                issuer: *mut c_void,
                pub validity: *mut X509_VAL,
                subject: *mut c_void,
                key: *mut c_void,
                issuerUID: *mut c_void,
                subjectUID: *mut c_void,
                pub extensions: *mut stack_st_X509_EXTENSION,
                enc: ASN1_ENCODING,
            }
        }
    }

    stack!(stack_st_X509);

    cfg_if! {
        if #[cfg(not(ossl110))] {
            pub const X509_LU_FAIL: c_int = 0;
            pub const X509_LU_X509: c_int = 1;
            pub const X509_LU_CRL: c_int = 2;
        }
    }

    cfg_if! {
        if #[cfg(any(ossl110, libressl270))] {
            pub enum X509_OBJECT {}
        } else {
            #[repr(C)]
            pub struct X509_OBJECT {
                pub type_: c_int,
                pub data: X509_OBJECT_data,
            }
            #[repr(C)]
            pub union X509_OBJECT_data {
                pub ptr: *mut c_char,
                pub x509: *mut X509,
                pub crl: *mut X509_CRL,
                pub pkey: *mut EVP_PKEY,
            }
        }
    }

    stack!(stack_st_X509_OBJECT);

    pub enum X509_LOOKUP {}

    stack!(stack_st_X509_LOOKUP);

    extern "C" {
        pub fn X509_verify_cert_error_string(n: c_long) -> *const c_char;

        pub fn X509_sign(x: *mut X509, pkey: *mut EVP_PKEY, md: *const EVP_MD) -> c_int;

        pub fn X509_digest(
            x: *const X509,
            digest: *const EVP_MD,
            buf: *mut c_uchar,
            len: *mut c_uint,
        ) -> c_int;

        pub fn X509_REQ_sign(x: *mut X509_REQ, pkey: *mut EVP_PKEY, md: *const EVP_MD) -> c_int;

        pub fn i2d_X509_bio(b: *mut BIO, x: *mut X509) -> c_int;
        pub fn i2d_X509_REQ_bio(b: *mut BIO, x: *mut X509_REQ) -> c_int;
        pub fn i2d_PrivateKey_bio(b: *mut BIO, x: *mut EVP_PKEY) -> c_int;
        pub fn i2d_PUBKEY_bio(b: *mut BIO, x: *mut EVP_PKEY) -> c_int;

        pub fn i2d_PUBKEY(k: *mut EVP_PKEY, buf: *mut *mut u8) -> c_int;
        pub fn d2i_PUBKEY(k: *mut *mut EVP_PKEY, buf: *mut *const u8, len: c_long) -> *mut EVP_PKEY;
        pub fn d2i_RSA_PUBKEY(k: *mut *mut RSA, buf: *mut *const u8, len: c_long) -> *mut RSA;
        pub fn i2d_RSA_PUBKEY(k: *mut RSA, buf: *mut *mut u8) -> c_int;
        pub fn d2i_DSA_PUBKEY(k: *mut *mut DSA, pp: *mut *const c_uchar, length: c_long) -> *mut DSA;
        pub fn i2d_DSA_PUBKEY(a: *mut DSA, pp: *mut *mut c_uchar) -> c_int;
        pub fn d2i_EC_PUBKEY(
            a: *mut *mut EC_KEY,
            pp: *mut *const c_uchar,
            length: c_long,
        ) -> *mut EC_KEY;
        pub fn i2d_EC_PUBKEY(a: *mut EC_KEY, pp: *mut *mut c_uchar) -> c_int;
        pub fn i2d_PrivateKey(k: *mut EVP_PKEY, buf: *mut *mut u8) -> c_int;

        pub fn d2i_ECPrivateKey(
            k: *mut *mut EC_KEY,
            pp: *mut *const c_uchar,
            length: c_long,
        ) -> *mut EC_KEY;
        pub fn i2d_ECPrivateKey(ec_key: *mut EC_KEY, pp: *mut *mut c_uchar) -> c_int;
    }

    const_ptr_api! {
        extern "C" {
            #[cfg(ossl102)]
            pub fn X509_ALGOR_get0(
                paobj: *mut #[const_ptr_if(ossl110)] ASN1_OBJECT,
                pptype: *mut c_int,
                ppval: *mut #[const_ptr_if(ossl110)] c_void,
                alg: #[const_ptr_if(ossl110)] X509_ALGOR,
            );
        }
    }

    extern "C" {
        pub fn X509_gmtime_adj(time: *mut ASN1_TIME, adj: c_long) -> *mut ASN1_TIME;

        pub fn X509_to_X509_REQ(x: *mut X509, pkey: *mut EVP_PKEY, md: *const EVP_MD) -> *mut X509_REQ;

        pub fn X509_ALGOR_free(x: *mut X509_ALGOR);

        pub fn X509_REVOKED_new() -> *mut X509_REVOKED;
        pub fn X509_REVOKED_free(x: *mut X509_REVOKED);
        #[cfg(any(ossl110, libressl270))]
        pub fn X509_REVOKED_dup(rev: *mut X509_REVOKED) -> *mut X509_REVOKED;
        pub fn d2i_X509_REVOKED(
            a: *mut *mut X509_REVOKED,
            pp: *mut *const c_uchar,
            length: c_long,
        ) -> *mut X509_REVOKED;
        pub fn i2d_X509_REVOKED(x: *mut X509_REVOKED, buf: *mut *mut u8) -> c_int;
        pub fn X509_CRL_new() -> *mut X509_CRL;
        pub fn X509_CRL_free(x: *mut X509_CRL);
        pub fn d2i_X509_CRL(
            a: *mut *mut X509_CRL,
            pp: *mut *const c_uchar,
            length: c_long,
        ) -> *mut X509_CRL;
        pub fn i2d_X509_CRL(x: *mut X509_CRL, buf: *mut *mut u8) -> c_int;

        pub fn X509_REQ_new() -> *mut X509_REQ;
        pub fn X509_REQ_free(x: *mut X509_REQ);
        pub fn d2i_X509_REQ(
            a: *mut *mut X509_REQ,
            pp: *mut *const c_uchar,
            length: c_long,
        ) -> *mut X509_REQ;
        pub fn i2d_X509_REQ(x: *mut X509_REQ, buf: *mut *mut u8) -> c_int;
    }

    const_ptr_api! {
        extern "C" {
            #[cfg(any(ossl102, libressl273))]
            pub fn X509_get0_signature(
                psig: *mut #[const_ptr_if(any(ossl110, libressl273))] ASN1_BIT_STRING,
                palg: *mut #[const_ptr_if(any(ossl110, libressl273))] X509_ALGOR,
                x: *const X509,
            );
        }
    }
    extern "C" {
        #[cfg(ossl102)]
        pub fn X509_get_signature_nid(x: *const X509) -> c_int;

        pub fn X509_EXTENSION_free(ext: *mut X509_EXTENSION);

        pub fn X509_NAME_ENTRY_free(x: *mut X509_NAME_ENTRY);

        pub fn X509_NAME_new() -> *mut X509_NAME;
        pub fn X509_NAME_free(x: *mut X509_NAME);

        pub fn X509_new() -> *mut X509;
        pub fn X509_free(x: *mut X509);
        pub fn i2d_X509(x: *mut X509, buf: *mut *mut u8) -> c_int;
        pub fn d2i_X509(a: *mut *mut X509, pp: *mut *const c_uchar, length: c_long) -> *mut X509;

        pub fn X509_get_pubkey(x: *mut X509) -> *mut EVP_PKEY;

        pub fn X509_set_version(x: *mut X509, version: c_long) -> c_int;
        #[cfg(ossl110)]
        pub fn X509_get_version(x: *const X509) -> c_long;
        pub fn X509_set_serialNumber(x: *mut X509, sn: *mut ASN1_INTEGER) -> c_int;
        pub fn X509_get_serialNumber(x: *mut X509) -> *mut ASN1_INTEGER;
        pub fn X509_set_issuer_name(x: *mut X509, name: *mut X509_NAME) -> c_int;

        pub fn X509_subject_name_hash(x: *mut ::X509) -> c_ulong;
    }
    const_ptr_api! {
        extern "C" {
            pub fn X509_get_issuer_name(x: #[const_ptr_if(any(ossl110, libressl280))] ::X509) -> *mut ::X509_NAME;
        }
    }
    extern "C" {
        pub fn X509_set_subject_name(x: *mut X509, name: *mut X509_NAME) -> c_int;
    }
    const_ptr_api! {
        extern "C" {
            pub fn X509_get_subject_name(x: #[const_ptr_if(any(ossl110, libressl280))] ::X509) -> *mut ::X509_NAME;
        }
    }
    cfg_if! {
        if #[cfg(ossl110)] {
            extern "C" {
                pub fn X509_set1_notBefore(x: *mut ::X509, tm: *const ::ASN1_TIME) -> c_int;
                pub fn X509_set1_notAfter(x: *mut ::X509, tm: *const ::ASN1_TIME) -> c_int;
            }
        } else {
            extern "C" {
                pub fn X509_set_notBefore(x: *mut ::X509, tm: *const ::ASN1_TIME) -> c_int;
                pub fn X509_set_notAfter(x: *mut ::X509, tm: *const ::ASN1_TIME) -> c_int;
            }
        }
    }
    extern "C" {
        #[cfg(ossl110)]
        pub fn X509_REQ_get_version(req: *const X509_REQ) -> c_long;
        pub fn X509_REQ_set_version(req: *mut X509_REQ, version: c_long) -> c_int;
        #[cfg(ossl110)]
        pub fn X509_REQ_get_subject_name(req: *const X509_REQ) -> *mut X509_NAME;
        pub fn X509_REQ_set_subject_name(req: *mut X509_REQ, name: *mut X509_NAME) -> c_int;
        pub fn X509_REQ_set_pubkey(req: *mut X509_REQ, pkey: *mut EVP_PKEY) -> c_int;
        pub fn X509_REQ_get_pubkey(req: *mut X509_REQ) -> *mut EVP_PKEY;
        pub fn X509_REQ_get_extensions(req: *mut X509_REQ) -> *mut stack_st_X509_EXTENSION;
        pub fn X509_REQ_add_extensions(req: *mut X509_REQ, exts: *mut stack_st_X509_EXTENSION)
            -> c_int;
        pub fn X509_set_pubkey(x: *mut X509, pkey: *mut EVP_PKEY) -> c_int;
        pub fn X509_REQ_verify(req: *mut X509_REQ, pkey: *mut EVP_PKEY) -> c_int;
        #[cfg(any(ossl110, libressl273))]
        pub fn X509_getm_notBefore(x: *const X509) -> *mut ASN1_TIME;
        #[cfg(any(ossl110, libressl273))]
        pub fn X509_getm_notAfter(x: *const X509) -> *mut ASN1_TIME;
        #[cfg(any(ossl110, libressl273))]
        pub fn X509_up_ref(x: *mut X509) -> c_int;

        #[cfg(any(ossl110, libressl270))]
        pub fn X509_REVOKED_get0_serialNumber(req: *const X509_REVOKED) -> *const ASN1_INTEGER;
        #[cfg(any(ossl110, libressl270))]
        pub fn X509_REVOKED_get0_revocationDate(req: *const X509_REVOKED) -> *const ASN1_TIME;
        #[cfg(any(ossl110, libressl270))]
        pub fn X509_REVOKED_get0_extensions(r: *const X509_REVOKED) -> *const stack_st_X509_EXTENSION;

        pub fn X509_REVOKED_set_serialNumber(r: *mut X509_REVOKED, serial: *mut ASN1_INTEGER) -> c_int;
        pub fn X509_REVOKED_set_revocationDate(r: *mut X509_REVOKED, tm: *mut ASN1_TIME) -> c_int;

        pub fn X509_CRL_sign(x: *mut X509_CRL, pkey: *mut EVP_PKEY, md: *const EVP_MD) -> c_int;
        pub fn X509_CRL_digest(
            x: *const X509_CRL,
            digest: *const EVP_MD,
            md: *mut c_uchar,
            len: *mut c_uint,
        ) -> c_int;
        pub fn X509_CRL_verify(crl: *mut X509_CRL, pkey: *mut EVP_PKEY) -> c_int;
        pub fn X509_CRL_get0_by_cert(
            x: *mut X509_CRL,
            ret: *mut *mut X509_REVOKED,
            cert: *mut X509,
        ) -> c_int;
        pub fn X509_CRL_get0_by_serial(
            x: *mut X509_CRL,
            ret: *mut *mut X509_REVOKED,
            serial: *mut ASN1_INTEGER,
        ) -> c_int;

        #[cfg(any(ossl110, libressl281))]
        pub fn X509_CRL_get_REVOKED(crl: *mut X509_CRL) -> *mut stack_st_X509_REVOKED;
        #[cfg(any(ossl110, libressl281))]
        pub fn X509_CRL_get0_nextUpdate(x: *const X509_CRL) -> *const ASN1_TIME;
        #[cfg(any(ossl110, libressl281))]
        pub fn X509_CRL_get0_lastUpdate(x: *const X509_CRL) -> *const ASN1_TIME;
        #[cfg(any(ossl110, libressl281))]
        pub fn X509_CRL_get_issuer(x: *const X509_CRL) -> *mut X509_NAME;

        #[cfg(ossl110)]
        pub fn X509_get0_extensions(req: *const ::X509) -> *const stack_st_X509_EXTENSION;

        pub fn X509_CRL_set_version(crl: *mut X509_CRL, version: c_long) -> c_int;
        pub fn X509_CRL_set_issuer_name(crl: *mut X509_CRL, name: *mut X509_NAME) -> c_int;
        pub fn X509_CRL_sort(crl: *mut X509_CRL) -> c_int;

        #[cfg(any(ossl110, libressl270))]
        pub fn X509_CRL_up_ref(crl: *mut X509_CRL) -> c_int;
        pub fn X509_CRL_add0_revoked(crl: *mut X509_CRL, rev: *mut X509_REVOKED) -> c_int;
    }
    cfg_if! {
        if #[cfg(any(ossl110, libressl270))] {
            extern "C" {
                pub fn X509_CRL_set1_lastUpdate(crl: *mut X509_CRL, tm: *const ASN1_TIME) -> c_int;
                pub fn X509_CRL_set1_nextUpdate(crl: *mut X509_CRL, tm: *const ASN1_TIME) -> c_int;
            }
        } else {
            // libressl270 kept them, ossl110 "#define"s them to the variants above
            extern "C" {
                pub fn X509_CRL_set_lastUpdate(crl: *mut X509_CRL, tm: *const ASN1_TIME) -> c_int;
                pub fn X509_CRL_set_nextUpdate(crl: *mut X509_CRL, tm: *const ASN1_TIME) -> c_int;
            }
        }
    }

    const_ptr_api! {
        extern "C" {
            pub fn X509_NAME_entry_count(n: #[const_ptr_if(any(ossl110, libressl280))] X509_NAME) -> c_int;
            pub fn X509_NAME_get_index_by_NID(n: #[const_ptr_if(libressl280)] X509_NAME, nid: c_int, last_pos: c_int) -> c_int;
        }
    }
    const_ptr_api! {
        extern "C" {
            pub fn X509_NAME_get_entry(n: #[const_ptr_if(any(ossl110, libressl280))] X509_NAME, loc: c_int) -> *mut X509_NAME_ENTRY;
            pub fn X509_NAME_add_entry_by_NID(
                x: *mut X509_NAME,
                field: c_int,
                ty: c_int,
                bytes: #[const_ptr_if(any(ossl110, libressl280))] c_uchar,
                len: c_int,
                loc: c_int,
                set: c_int,
            ) -> c_int;
            pub fn X509_NAME_ENTRY_get_object(ne: #[const_ptr_if(any(ossl110, libressl280))] X509_NAME_ENTRY) -> *mut ASN1_OBJECT;
            pub fn X509_NAME_ENTRY_get_data(ne: #[const_ptr_if(any(ossl110, libressl280))] X509_NAME_ENTRY) -> *mut ASN1_STRING;
        }
    }
    extern "C" {
        pub fn X509_NAME_add_entry_by_txt(
            x: *mut X509_NAME,
            field: *const c_char,
            ty: c_int,
            bytes: *const c_uchar,
            len: c_int,
            loc: c_int,
            set: c_int,
        ) -> c_int;
    }

    // "raw" X509_EXTENSION related functions
    extern "C" {
        // in X509
        pub fn X509_delete_ext(x: *mut X509, loc: c_int) -> *mut X509_EXTENSION;
        pub fn X509_add_ext(x: *mut X509, ext: *mut X509_EXTENSION, loc: c_int) -> c_int;
        pub fn X509_add1_ext_i2d(
            x: *mut X509,
            nid: c_int,
            value: *mut c_void,
            crit: c_int,
            flags: c_ulong,
        ) -> c_int;
        // in X509_CRL
        pub fn X509_CRL_delete_ext(x: *mut X509_CRL, loc: c_int) -> *mut X509_EXTENSION;
        pub fn X509_CRL_add_ext(x: *mut X509_CRL, ext: *mut X509_EXTENSION, loc: c_int) -> c_int;
        pub fn X509_CRL_add1_ext_i2d(
            x: *mut X509_CRL,
            nid: c_int,
            value: *mut c_void,
            crit: c_int,
            flags: c_ulong,
        ) -> c_int;
        // in X509_REVOKED
        pub fn X509_REVOKED_delete_ext(x: *mut X509_REVOKED, loc: c_int) -> *mut X509_EXTENSION;
        pub fn X509_REVOKED_add_ext(
            x: *mut X509_REVOKED,
            ext: *mut X509_EXTENSION,
            loc: c_int,
        ) -> c_int;
        pub fn X509_REVOKED_add1_ext_i2d(
            x: *mut X509_REVOKED,
            nid: c_int,
            value: *mut c_void,
            crit: c_int,
            flags: c_ulong,
        ) -> c_int;
        // X509_EXTENSION stack
        // - these getters always used *const STACK
        pub fn X509v3_get_ext_count(x: *const stack_st_X509_EXTENSION) -> c_int;
        pub fn X509v3_get_ext_by_NID(
            x: *const stack_st_X509_EXTENSION,
            nid: c_int,
            lastpos: c_int,
        ) -> c_int;
        pub fn X509v3_get_ext_by_critical(
            x: *const stack_st_X509_EXTENSION,
            crit: c_int,
            lastpos: c_int,
        ) -> c_int;
        pub fn X509v3_get_ext(x: *const stack_st_X509_EXTENSION, loc: c_int) -> *mut X509_EXTENSION;
        pub fn X509v3_delete_ext(x: *mut stack_st_X509_EXTENSION, loc: c_int) -> *mut X509_EXTENSION;
        pub fn X509v3_add_ext(
            x: *mut *mut stack_st_X509_EXTENSION,
            ex: *mut X509_EXTENSION,
            loc: c_int,
        ) -> *mut stack_st_X509_EXTENSION;
        // - X509V3_add1_i2d in x509v3.rs
        // X509_EXTENSION itself
        pub fn X509_EXTENSION_create_by_NID(
            ex: *mut *mut X509_EXTENSION,
            nid: c_int,
            crit: c_int,
            data: *mut ASN1_OCTET_STRING,
        ) -> *mut X509_EXTENSION;
        pub fn X509_EXTENSION_set_critical(ex: *mut X509_EXTENSION, crit: c_int) -> c_int;
        pub fn X509_EXTENSION_set_data(ex: *mut X509_EXTENSION, data: *mut ASN1_OCTET_STRING) -> c_int;
        pub fn X509_EXTENSION_get_object(ext: *mut X509_EXTENSION) -> *mut ASN1_OBJECT;
        pub fn X509_EXTENSION_get_data(ext: *mut X509_EXTENSION) -> *mut ASN1_OCTET_STRING;
    }
    const_ptr_api! {
        extern "C" {
            // in X509
            pub fn X509_get_ext_count(x: #[const_ptr_if(any(ossl110, libressl280))] X509) -> c_int;
            pub fn X509_get_ext_by_NID(x: #[const_ptr_if(any(ossl110, libressl280))] X509, nid: c_int, lastpos: c_int) -> c_int;
            pub fn X509_get_ext_by_OBJ(x: #[const_ptr_if(any(ossl110, libressl280))] X509, obj: #[const_ptr_if(any(ossl110, libressl280))] ASN1_OBJECT, lastpos: c_int) -> c_int;
            pub fn X509_get_ext_by_critical(x: #[const_ptr_if(any(ossl110, libressl280))] X509, crit: c_int, lastpos: c_int) -> c_int;
            pub fn X509_get_ext(x: #[const_ptr_if(any(ossl110, libressl280))] X509, loc: c_int) -> *mut X509_EXTENSION;
            pub fn X509_get_ext_d2i(
                x: #[const_ptr_if(any(ossl110, libressl280))] ::X509,
                nid: c_int,
                crit: *mut c_int,
                idx: *mut c_int,
            ) -> *mut c_void;
            // in X509_CRL
            pub fn X509_CRL_get_ext_count(x: #[const_ptr_if(any(ossl110, libressl280))] X509_CRL) -> c_int;
            pub fn X509_CRL_get_ext_by_NID(x: #[const_ptr_if(any(ossl110, libressl280))] X509_CRL, nid: c_int, lastpos: c_int) -> c_int;
            pub fn X509_CRL_get_ext_by_OBJ(x: #[const_ptr_if(any(ossl110, libressl280))] X509_CRL, obj: #[const_ptr_if(any(ossl110, libressl280))] ASN1_OBJECT, lastpos: c_int) -> c_int;
            pub fn X509_CRL_get_ext_by_critical(x: #[const_ptr_if(any(ossl110, libressl280))] X509_CRL, crit: c_int, lastpos: c_int) -> c_int;
            pub fn X509_CRL_get_ext(x: #[const_ptr_if(any(ossl110, libressl280))] X509_CRL, loc: c_int) -> *mut X509_EXTENSION;
            pub fn X509_CRL_get_ext_d2i(
                x: #[const_ptr_if(any(ossl110, libressl280))] ::X509_CRL,
                nid: c_int,
                crit: *mut c_int,
                idx: *mut c_int,
            ) -> *mut c_void;
            // in X509_REVOKED
            pub fn X509_REVOKED_get_ext_count(x: #[const_ptr_if(any(ossl110, libressl280))] X509_REVOKED) -> c_int;
            pub fn X509_REVOKED_get_ext_by_NID(x: #[const_ptr_if(any(ossl110, libressl280))] X509_REVOKED, nid: c_int, lastpos: c_int) -> c_int;
            pub fn X509_REVOKED_get_ext_by_OBJ(x: #[const_ptr_if(any(ossl110, libressl280))] X509_REVOKED, obj: #[const_ptr_if(any(ossl110, libressl280))] ASN1_OBJECT, lastpos: c_int) -> c_int;
            pub fn X509_REVOKED_get_ext_by_critical(x: #[const_ptr_if(any(ossl110, libressl280))] X509_REVOKED, crit: c_int, lastpos: c_int) -> c_int;
            pub fn X509_REVOKED_get_ext(x: #[const_ptr_if(any(ossl110, libressl280))] X509_REVOKED, loc: c_int) -> *mut X509_EXTENSION;
            pub fn X509_REVOKED_get_ext_d2i(
                x: #[const_ptr_if(any(ossl110, libressl280))] ::X509_REVOKED,
                nid: c_int,
                crit: *mut c_int,
                idx: *mut c_int,
            ) -> *mut c_void;
            // X509_EXTENSION stack
            pub fn X509v3_get_ext_by_OBJ(x: *const stack_st_X509_EXTENSION, obj: #[const_ptr_if(any(ossl110, libressl280))] ASN1_OBJECT, lastpos: c_int) -> c_int;
            // X509_EXTENSION itself
            pub fn X509_EXTENSION_create_by_OBJ(ex: *mut *mut X509_EXTENSION, obj: #[const_ptr_if(any(ossl110, libressl280))] ASN1_OBJECT, crit: c_int, data: *mut ASN1_OCTET_STRING) -> *mut X509_EXTENSION;
            pub fn X509_EXTENSION_set_object(ex: *mut X509_EXTENSION, obj: #[const_ptr_if(any(ossl110, libressl280))] ASN1_OBJECT) -> c_int;
            pub fn X509_EXTENSION_get_critical(ex: #[const_ptr_if(any(ossl110, libressl280))] X509_EXTENSION) -> c_int;
        }
    }

    extern "C" {
        pub fn X509_verify_cert(ctx: *mut X509_STORE_CTX) -> c_int;
    }

    #[cfg(any(ossl110, libressl270))]
    extern "C" {
        pub fn X509_STORE_get0_objects(ctx: *mut X509_STORE) -> *mut stack_st_X509_OBJECT;
        pub fn X509_OBJECT_get0_X509(x: *const X509_OBJECT) -> *mut X509;
    }

    cfg_if! {
        if #[cfg(ossl110)] {
            extern "C" {
                pub fn X509_OBJECT_free(a: *mut X509_OBJECT);
            }
        } else {
            extern "C" {
                pub fn X509_OBJECT_free_contents(a: *mut X509_OBJECT);
            }
        }
    }