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-=pod
-
-=head1 NAME
-
-SSL_COMP_add_compression_method, SSL_COMP_free_compression_methods - handle SSL/TLS integrated compression methods
-
-=head1 SYNOPSIS
-
- #include <openssl/ssl.h>
-
- int SSL_COMP_add_compression_method(int id, COMP_METHOD *cm);
-
- +void SSL_COMP_free_compression_methods(void);
-
-=head1 DESCRIPTION
-
-SSL_COMP_add_compression_method() adds the compression method B<cm> with
-the identifier B<id> to the list of available compression methods. This
-list is globally maintained for all SSL operations within this application.
-It cannot be set for specific SSL_CTX or SSL objects.
-
-SSL_COMP_free_compression_methods() frees the internal table of
-compression methods that were built internally, and possibly
-augmented by adding SSL_COMP_add_compression_method().
-
-=head1 NOTES
-
-The TLS standard (or SSLv3) allows the integration of compression methods
-into the communication. The TLS RFC does however not specify compression
-methods or their corresponding identifiers, so there is currently no compatible
-way to integrate compression with unknown peers. It is therefore currently not
-recommended to integrate compression into applications. Applications for
-non-public use may agree on certain compression methods. Using different
-compression methods with the same identifier will lead to connection failure.
-
-An OpenSSL client speaking a protocol that allows compression (SSLv3, TLSv1)
-will unconditionally send the list of all compression methods enabled with
-SSL_COMP_add_compression_method() to the server during the handshake.
-Unlike the mechanisms to set a cipher list, there is no method available to
-restrict the list of compression method on a per connection basis.
-
-An OpenSSL server will match the identifiers listed by a client against
-its own compression methods and will unconditionally activate compression
-when a matching identifier is found. There is no way to restrict the list
-of compression methods supported on a per connection basis.
-
-If enabled during compilation, the OpenSSL library will have the
-COMP_zlib() compression method available.
-
-=head1 WARNINGS
-
-Once the identities of the compression methods for the TLS protocol have
-been standardized, the compression API will most likely be changed. Using
-it in the current state is not recommended.
-
-=head1 RETURN VALUES
-
-SSL_COMP_add_compression_method() may return the following values:
-
-=over 4
-
-=item Z<>0
-
-The operation succeeded.
-
-=item Z<>1
-
-The operation failed. Check the error queue to find out the reason.
-
-=back
-
-=head1 SEE ALSO
-
-L<ssl(3)|ssl(3)>
-
-=cut