Manual Pages for UNIX Operating System command usage for man SSL_COMP_add_compression_method

OpenSSL                 SSL_COMP_add_compression_method(3openssl)



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     SSL_COMP_add_compression_method - handle SSL/TLS integrated
     compression methods

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      #include 

      int SSL_COMP_add_compression_method(int id, COMP_METHOD *cm);


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     SSL_COMP_add_compression_method() adds the compression
     method ccccmmmm with the identifier iiiidddd 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.

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     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.

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

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     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.



29/Nov/2003            Last change: 0.9.8o                      1






OpenSSL                 SSL_COMP_add_compression_method(3openssl)



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     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.

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     ssl(3)












































29/Nov/2003            Last change: 0.9.8o                      2