Function SecKeyCreateSignature 

pub unsafe extern "C-unwind" fn SecKeyCreateSignature(
    key: &SecKey,
    algorithm: &SecKeyAlgorithm,
    data_to_sign: &CFData,
    error: *mut *mut CFError,
) -> Option<CFRetained<CFData>>

👎Deprecated: renamed to SecKey::signature

Available on crate features SecBase and SecKey only.