Someone might change the constant.
+If a B<BIGNUM> is equal to 0xffffffffL it can be represented as an
+unsigned long but this value is also returned on error.
+
=head1 SEE ALSO
-bn(3), BN_bn2bin(3)
+L<bn(3)|bn(3)>, L<BN_bn2bin(3)|BN_bn2bin(3)>
=head1 HISTORY