Function olm_sys::olm_account_sign

pub unsafe extern "C" fn olm_account_sign(
    account: *mut OlmAccount, 
    message: *const c_void, 
    message_length: usize, 
    signature: *mut c_void, 
    signature_length: usize
) -> usize

Signs a message with the ed25519 key for this account. Returns olm_error() on failure. If the signature buffer was too small then olm_account_last_error() will be “OUTPUT_BUFFER_TOO_SMALL”