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+.\" ======================================================================
+.\"
+.IX Title "SSL_COMP_ADD_COMPRESSION_METHOD 1"
+.TH SSL_COMP_ADD_COMPRESSION_METHOD 1 "perl v5.6.1" "2002-01-27" "User Contributed Perl Documentation"
+.UC
+.SH "NAME"
+SSL_COMP_add_compression_method \- handle \s-1SSL/TLS\s0 integrated compression methods
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+.Vb 1
+\& #include <openssl/ssl.h>
+.Ve
+.Vb 1
+\& int SSL_COMP_add_compression_method(int id, COMP_METHOD *cm);
+.Ve
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+\&\fISSL_COMP_add_compression_method()\fR adds the compression method \fBcm\fR with
+the identifier \fBid\fR to the list of available compression methods. This
+list is globally maintained for all \s-1SSL\s0 operations within this application.
+It cannot be set for specific \s-1SSL_CTX\s0 or \s-1SSL\s0 objects.
+.SH "NOTES"
+.IX Header "NOTES"
+The \s-1TLS\s0 standard (or SSLv3) allows the integration of compression methods
+into the communication. The \s-1TLS\s0 \s-1RFC\s0 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.
+.PP
+An OpenSSL client speaking a protocol that allows compression (SSLv3, TLSv1)
+will unconditionally send the list of all compression methods enabled with
+\&\fISSL_COMP_add_compression_method()\fR 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.
+.PP
+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.
+.PP
+The OpenSSL library has the compression methods \fB\f(BICOMP_rle()\fB\fR and (when
+especially enabled during compilation) \fB\f(BICOMP_zlib()\fB\fR available.
+.SH "WARNINGS"
+.IX Header "WARNINGS"
+Once the identities of the compression methods for the \s-1TLS\s0 protocol have
+been standardized, the compression \s-1API\s0 will most likely be changed. Using
+it in the current state is not recommended.
+.SH "RETURN VALUES"
+.IX Header "RETURN VALUES"
+\&\fISSL_COMP_add_compression_method()\fR may return the following values:
+.Ip "1" 4
+.IX Item "1"
+The operation succeeded.
+.Ip "0" 4
+The operation failed. Check the error queue to find out the reason.
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+ssl(3)