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    use libc::*;

    use *;

    #[repr(C)]
    #[derive(Copy, Clone)]
    pub enum point_conversion_form_t {
        POINT_CONVERSION_COMPRESSED = 2,
        POINT_CONVERSION_UNCOMPRESSED = 4,
        POINT_CONVERSION_HYBRID = 6,
    }

    pub enum EC_METHOD {}
    pub enum EC_GROUP {}
    pub enum EC_POINT {}

    pub const OPENSSL_EC_NAMED_CURVE: c_int = 1;

    extern "C" {
        #[cfg(not(osslconf = "OPENSSL_NO_EC2M"))]
        pub fn EC_GF2m_simple_method() -> *const EC_METHOD;

        pub fn EC_GROUP_new(meth: *const EC_METHOD) -> *mut EC_GROUP;

        pub fn EC_GROUP_free(group: *mut EC_GROUP);

        pub fn EC_GROUP_get_order(
            group: *const EC_GROUP,
            order: *mut BIGNUM,
            ctx: *mut BN_CTX,
        ) -> c_int;

        pub fn EC_GROUP_get_cofactor(
            group: *const EC_GROUP,
            cofactor: *mut BIGNUM,
            ctx: *mut BN_CTX,
        ) -> c_int;

        pub fn EC_GROUP_get0_generator(group: *const EC_GROUP) -> *const EC_POINT;

        pub fn EC_GROUP_get_curve_name(group: *const EC_GROUP) -> c_int;

        pub fn EC_GROUP_set_asn1_flag(key: *mut EC_GROUP, flag: c_int);

        pub fn EC_GROUP_get_curve_GFp(
            group: *const EC_GROUP,
            p: *mut BIGNUM,
            a: *mut BIGNUM,
            b: *mut BIGNUM,
            ctx: *mut BN_CTX,
        ) -> c_int;

        #[cfg(not(osslconf = "OPENSSL_NO_EC2M"))]
        pub fn EC_GROUP_get_curve_GF2m(
            group: *const EC_GROUP,
            p: *mut BIGNUM,
            a: *mut BIGNUM,
            b: *mut BIGNUM,
            ctx: *mut BN_CTX,
        ) -> c_int;

        pub fn EC_GROUP_get_degree(group: *const EC_GROUP) -> c_int;

        #[cfg(ossl110)]
        pub fn EC_GROUP_order_bits(group: *const EC_GROUP) -> c_int;

        pub fn EC_GROUP_new_curve_GFp(
            p: *const BIGNUM,
            a: *const BIGNUM,
            b: *const BIGNUM,
            ctx: *mut BN_CTX,
        ) -> *mut EC_GROUP;

        #[cfg(not(osslconf = "OPENSSL_NO_EC2M"))]
        pub fn EC_GROUP_new_curve_GF2m(
            p: *const BIGNUM,
            a: *const BIGNUM,
            b: *const BIGNUM,
            ctx: *mut BN_CTX,
        ) -> *mut EC_GROUP;

        pub fn EC_GROUP_new_by_curve_name(nid: c_int) -> *mut EC_GROUP;

        pub fn EC_POINT_new(group: *const EC_GROUP) -> *mut EC_POINT;

        pub fn EC_POINT_free(point: *mut EC_POINT);

        pub fn EC_POINT_dup(p: *const EC_POINT, group: *const EC_GROUP) -> *mut EC_POINT;

        pub fn EC_POINT_get_affine_coordinates_GFp(
            group: *const EC_GROUP,
            p: *const EC_POINT,
            x: *mut BIGNUM,
            y: *mut BIGNUM,
            ctx: *mut BN_CTX,
        ) -> c_int;

        #[cfg(not(osslconf = "OPENSSL_NO_EC2M"))]
        pub fn EC_POINT_get_affine_coordinates_GF2m(
            group: *const EC_GROUP,
            p: *const EC_POINT,
            x: *mut BIGNUM,
            y: *mut BIGNUM,
            ctx: *mut BN_CTX,
        ) -> c_int;

        pub fn EC_POINT_point2oct(
            group: *const EC_GROUP,
            p: *const EC_POINT,
            form: point_conversion_form_t,
            buf: *mut c_uchar,
            len: size_t,
            ctx: *mut BN_CTX,
        ) -> size_t;

        pub fn EC_POINT_oct2point(
            group: *const EC_GROUP,
            p: *mut EC_POINT,
            buf: *const c_uchar,
            len: size_t,
            ctx: *mut BN_CTX,
        ) -> c_int;

        pub fn EC_POINT_add(
            group: *const EC_GROUP,
            r: *mut EC_POINT,
            a: *const EC_POINT,
            b: *const EC_POINT,
            ctx: *mut BN_CTX,
        ) -> c_int;

        pub fn EC_POINT_invert(group: *const EC_GROUP, r: *mut EC_POINT, ctx: *mut BN_CTX) -> c_int;

        pub fn EC_POINT_cmp(
            group: *const EC_GROUP,
            a: *const EC_POINT,
            b: *const EC_POINT,
            ctx: *mut BN_CTX,
        ) -> c_int;

        pub fn EC_POINT_mul(
            group: *const EC_GROUP,
            r: *mut EC_POINT,
            n: *const BIGNUM,
            q: *const EC_POINT,
            m: *const BIGNUM,
            ctx: *mut BN_CTX,
        ) -> c_int;

        pub fn EC_KEY_new() -> *mut EC_KEY;

        pub fn EC_KEY_new_by_curve_name(nid: c_int) -> *mut EC_KEY;

        pub fn EC_KEY_free(key: *mut EC_KEY);

        pub fn EC_KEY_dup(key: *const EC_KEY) -> *mut EC_KEY;

        pub fn EC_KEY_up_ref(key: *mut EC_KEY) -> c_int;

        pub fn EC_KEY_get0_group(key: *const EC_KEY) -> *const EC_GROUP;

        pub fn EC_KEY_set_group(key: *mut EC_KEY, group: *const EC_GROUP) -> c_int;

        pub fn EC_KEY_get0_private_key(key: *const EC_KEY) -> *const BIGNUM;

        pub fn EC_KEY_set_private_key(key: *mut EC_KEY, key: *const BIGNUM) -> c_int;

        pub fn EC_KEY_get0_public_key(key: *const EC_KEY) -> *const EC_POINT;

        pub fn EC_KEY_set_public_key(key: *mut EC_KEY, key: *const EC_POINT) -> c_int;

        pub fn EC_KEY_generate_key(key: *mut EC_KEY) -> c_int;

        pub fn EC_KEY_check_key(key: *const EC_KEY) -> c_int;

        pub fn EC_KEY_set_public_key_affine_coordinates(
            key: *mut EC_KEY,
            x: *mut BIGNUM,
            y: *mut BIGNUM,
        ) -> c_int;
    }

    cfg_if! {
        if #[cfg(any(ossl110, libressl280))] {
            pub enum ECDSA_SIG {}
        } else {
            #[repr(C)]
            pub struct ECDSA_SIG {
                pub r: *mut BIGNUM,
                pub s: *mut BIGNUM,
            }
        }
    }

    extern "C" {
        pub fn ECDSA_SIG_new() -> *mut ECDSA_SIG;

        pub fn ECDSA_SIG_free(sig: *mut ECDSA_SIG);

        #[cfg(any(ossl110, libressl273))]
        pub fn ECDSA_SIG_get0(sig: *const ECDSA_SIG, pr: *mut *const BIGNUM, ps: *mut *const BIGNUM);

        #[cfg(any(ossl110, libressl273))]
        pub fn ECDSA_SIG_set0(sig: *mut ECDSA_SIG, pr: *mut BIGNUM, ps: *mut BIGNUM) -> c_int;

        pub fn ECDSA_do_sign(
            dgst: *const c_uchar,
            dgst_len: c_int,
            eckey: *mut EC_KEY,
        ) -> *mut ECDSA_SIG;

        pub fn ECDSA_do_verify(
            dgst: *const c_uchar,
            dgst_len: c_int,
            sig: *const ECDSA_SIG,
            eckey: *mut EC_KEY,
        ) -> c_int;

        pub fn d2i_ECDSA_SIG(
            sig: *mut *mut ECDSA_SIG,
            inp: *mut *const c_uchar,
            length: c_long,
        ) -> *mut ECDSA_SIG;

        pub fn i2d_ECDSA_SIG(sig: *const ECDSA_SIG, out: *mut *mut c_uchar) -> c_int;
    }