Function nginx::PKCS5_PBKDF2_HMAC_SHA1

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