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OpenDarwin 7.2.1 - man page for ssl_comp_add_compression_method (opendarwin section 3)

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SSL_COMP_add_compression_method(3)	     OpenSSL	       SSL_COMP_add_compression_method(3)

NAME
       SSL_COMP_add_compression_method - handle SSL/TLS integrated compression methods

SYNOPSIS
	#include <openssl/ssl.h>

	int SSL_COMP_add_compression_method(int id, COMP_METHOD *cm);

DESCRIPTION
       SSL_COMP_add_compression_method() adds the compression method cm with the identifier 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.

NOTES
       The TLS standard (or SSLv3) allows the integration of compression methods into the commu-
       nication. 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 applica-
       tions. 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 uncondi-
       tionally send the list of all compression methods enabled with SSL_COMP_add_compres-
       sion_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 compres-
       sion 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 con-
       nection basis.

       The OpenSSL library has the compression methods COMP_rle() and (when especially enabled
       during compilation) COMP_zlib() available.

WARNINGS
       Once the identities of the compression methods for the TLS protocol have been standard-
       ized, the compression API will most likely be changed. Using it in the current state is
       not recommended.

RETURN VALUES
       SSL_COMP_add_compression_method() may return the following values:

       0   The operation succeeded.

       1   The operation failed. Check the error queue to find out the reason.

SEE ALSO
       ssl(3)

0.9.7d					    2004-05-17	       SSL_COMP_add_compression_method(3)
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