NG</b> structure or NULL in case of an error.</p>

<p>BN_BLINDING_update(), BN_BLINDING_convert(), BN_BLINDING_invert(), BN_BLINDING_convert_ex() and BN_BLINDING_invert_ex() return 1 on success and 0 if an error occurred.</p>

<p>BN_BLINDING_is_current_thread() returns 1 if the current thread owns the <b>BN_BLINDING</b> object, 0 otherwise.</p>

<p>BN_BLINDING_set_current_thread() doesn&#39;t return anything.</p>

<p>BN_BLINDING_lock(), BN_BLINDING_unlock() return 1 if the operation succeeded or 0 on error.