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    Command:

    SSL_COMP_add_compression_method

    
    
    
    

    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 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 CCOOMMPP_rrllee(()) and (when
           especially enabled during compilation) CCOOMMPP_zzlliibb(()) available.
    
    
    

    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.
    
           It is also not recommended to use compression if data transfered
           contain untrusted parts that can be manipulated by an attacker as he
           could then get information about the encrypted data. See the CRIME
           attack. For that reason the default loading of the zlib compression
           method is disabled and enabled only if the environment variable
           OPENSSL_DEFAULT_ZLIB is present during the library initialization.
    
    
    

    RETURN VALUES

           SSL_COMP_add_compression_method() may return the following values:
    
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