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-.\"
-.\"	$OpenBSD: SSL_COMP_add_compression_method.3,v 1.2 2014/12/02 14:11:01 jmc Exp $
-.\"
-.Dd $Mdocdate: December 2 2014 $
-.Dt SSL_COMP_ADD_COMPRESSION_METHOD 3
-.Os
-.Sh NAME
-.Nm SSL_COMP_add_compression_method
-.Nd handle SSL/TLS integrated compression methods
-.Sh SYNOPSIS
-.In openssl/ssl.h
-.Ft int
-.Fn SSL_COMP_add_compression_method "int id" "COMP_METHOD *cm"
-.Sh DESCRIPTION
-.Fn SSL_COMP_add_compression_method
-adds the compression method
-.Fa cm
-with the identifier
-.Fa 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.
-.Sh 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.
-.Pp
-An OpenSSL client speaking a protocol that allows compression (SSLv3, TLSv1)
-will unconditionally send the list of all compression methods enabled with
-.Fn 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.
-.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
-.Fn COMP_rle
-and (when especially enabled during compilation)
-.Fn COMP_zlib
-available.
-.Sh 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.
-.Sh RETURN VALUES
-.Fn SSL_COMP_add_compression_method
-may return the following values:
-.Bl -tag -width Ds
-.It 0
-The operation succeeded.
-.It 1
-The operation failed.
-Check the error queue to find out the reason.
-.El
-.Sh SEE ALSO
-.Xr ssl 3