Function openssl_sys::PKCS5_PBKDF2_HMAC_SHA1

pub unsafe extern fn PKCS5_PBKDF2_HMAC_SHA1(pass: *const c_char,
                                            passlen: c_int,
                                            salt: *const u8,
                                            saltlen: c_int,
                                            iter: c_int,
                                            keylen: c_int,
                                            out: *mut u8)
                                            -> c_int