Function openssl_sys::PKCS5_PBKDF2_HMAC_SHA1

pub unsafe extern "C" 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