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    use libc::*;

    use *;

    pub const V_ASN1_UTCTIME: c_int = 23;
    pub const V_ASN1_GENERALIZEDTIME: c_int = 24;

    pub const MBSTRING_FLAG: c_int = 0x1000;
    pub const MBSTRING_UTF8: c_int = MBSTRING_FLAG;
    pub const MBSTRING_ASC: c_int = MBSTRING_FLAG | 1;
    pub const MBSTRING_BMP: c_int = MBSTRING_FLAG | 2;
    pub const MBSTRING_UNIV: c_int = MBSTRING_FLAG | 4;

    #[repr(C)]
    pub struct ASN1_ENCODING {
        pub enc: *mut c_uchar,
        pub len: c_long,
        pub modified: c_int,
    }

    extern "C" {
        pub fn ASN1_OBJECT_free(x: *mut ASN1_OBJECT);
    }

    stack!(stack_st_ASN1_OBJECT);

    extern "C" {
        pub fn ASN1_STRING_type_new(ty: c_int) -> *mut ASN1_STRING;
        #[cfg(any(ossl110, libressl273))]
        pub fn ASN1_STRING_get0_data(x: *const ASN1_STRING) -> *const c_uchar;
        #[cfg(any(all(ossl101, not(ossl110)), libressl))]
        pub fn ASN1_STRING_data(x: *mut ASN1_STRING) -> *mut c_uchar;

        pub fn ASN1_BIT_STRING_free(x: *mut ASN1_BIT_STRING);

        pub fn ASN1_STRING_free(x: *mut ASN1_STRING);
        pub fn ASN1_STRING_length(x: *const ASN1_STRING) -> c_int;

        pub fn ASN1_GENERALIZEDTIME_free(tm: *mut ASN1_GENERALIZEDTIME);
        pub fn ASN1_GENERALIZEDTIME_print(b: *mut BIO, tm: *const ASN1_GENERALIZEDTIME) -> c_int;
        pub fn ASN1_TIME_new() -> *mut ASN1_TIME;
        #[cfg(ossl102)]
        pub fn ASN1_TIME_diff(
            pday: *mut c_int,
            psec: *mut c_int,
            from: *const ASN1_TIME,
            to: *const ASN1_TIME,
        ) -> c_int;
        pub fn ASN1_TIME_free(tm: *mut ASN1_TIME);
        pub fn ASN1_TIME_print(b: *mut BIO, tm: *const ASN1_TIME) -> c_int;
        pub fn ASN1_TIME_set(from: *mut ASN1_TIME, to: time_t) -> *mut ASN1_TIME;

        pub fn ASN1_INTEGER_free(x: *mut ASN1_INTEGER);
        pub fn ASN1_INTEGER_get(dest: *const ASN1_INTEGER) -> c_long;
        pub fn ASN1_INTEGER_set(dest: *mut ASN1_INTEGER, value: c_long) -> c_int;
        pub fn BN_to_ASN1_INTEGER(bn: *const BIGNUM, ai: *mut ASN1_INTEGER) -> *mut ASN1_INTEGER;
        pub fn ASN1_INTEGER_to_BN(ai: *const ASN1_INTEGER, bn: *mut BIGNUM) -> *mut BIGNUM;

        pub fn ASN1_TIME_set_string(s: *mut ASN1_TIME, str: *const c_char) -> c_int;
        #[cfg(ossl111)]
        pub fn ASN1_TIME_set_string_X509(s: *mut ASN1_TIME, str: *const c_char) -> c_int;
    }

    const_ptr_api! {
        extern "C" {
            pub fn ASN1_STRING_to_UTF8(out: *mut *mut c_uchar, s: #[const_ptr_if(any(ossl110, libressl280))] ASN1_STRING) -> c_int;
        }
    }