=head1 DESCRIPTION
These functions are used to obtain temporary B<BIGNUM> variables from
-a B<BN_CTX> in order to save the overhead of repeatedly creating and
+a B<BN_CTX> (which can been created by using L<BN_CTX_new(3)>)
+in order to save the overhead of repeatedly creating and
freeing B<BIGNUM>s in functions that are called from inside a loop.
A function must call BN_CTX_start() first. Then, BN_CTX_get() may be
Once BN_CTX_get() has failed, the subsequent calls will return B<NULL>
as well, so it is sufficient to check the return value of the last
BN_CTX_get() call. In case of an error, an error code is set, which
-can be obtained by L<ERR_get_error(3)|ERR_get_error(3)>.
+can be obtained by L<ERR_get_error(3)>.
=head1 SEE ALSO
-L<BN_CTX_new(3)|BN_CTX_new(3)>
+L<BN_CTX_new(3)>
-=head1 HISTORY
+=head1 COPYRIGHT
-BN_CTX_start(), BN_CTX_get() and BN_CTX_end() were added in OpenSSL 0.9.5.
+Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
+
+Licensed under the OpenSSL license (the "License"). You may not use
+this file except in compliance with the License. You can obtain a copy
+in the file LICENSE in the source distribution or at
+L<https://www.openssl.org/source/license.html>.
=cut