Update files for OpenSSL-1.0.0f import.
[dragonfly.git] / secure / lib / libssl / man / SSL_COMP_add_compression_method.3
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124.\" ========================================================================
125.\"
126.IX Title "SSL_COMP_add_compression_method 3"
e3261593 127.TH SSL_COMP_add_compression_method 3 "2012-01-04" "1.0.0f" "OpenSSL"
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128.\" For nroff, turn off justification. Always turn off hyphenation; it makes
129.\" way too many mistakes in technical documents.
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131.nh
984263bc 132.SH "NAME"
a7d27d5a 133SSL_COMP_add_compression_method \- handle SSL/TLS integrated compression methods
984263bc 134.SH "SYNOPSIS"
e056f0e0 135.IX Header "SYNOPSIS"
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136.Vb 1
137\& #include <openssl/ssl.h>
e257b235 138\&
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139\& int SSL_COMP_add_compression_method(int id, COMP_METHOD *cm);
140.Ve
141.SH "DESCRIPTION"
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142.IX Header "DESCRIPTION"
143\&\fISSL_COMP_add_compression_method()\fR adds the compression method \fBcm\fR with
984263bc 144the identifier \fBid\fR to the list of available compression methods. This
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145list is globally maintained for all \s-1SSL\s0 operations within this application.
146It cannot be set for specific \s-1SSL_CTX\s0 or \s-1SSL\s0 objects.
984263bc 147.SH "NOTES"
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148.IX Header "NOTES"
149The \s-1TLS\s0 standard (or SSLv3) allows the integration of compression methods
150into the communication. The \s-1TLS\s0 \s-1RFC\s0 does however not specify compression
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151methods or their corresponding identifiers, so there is currently no compatible
152way to integrate compression with unknown peers. It is therefore currently not
153recommended to integrate compression into applications. Applications for
154non-public use may agree on certain compression methods. Using different
155compression methods with the same identifier will lead to connection failure.
156.PP
157An OpenSSL client speaking a protocol that allows compression (SSLv3, TLSv1)
158will unconditionally send the list of all compression methods enabled with
e056f0e0 159\&\fISSL_COMP_add_compression_method()\fR to the server during the handshake.
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160Unlike the mechanisms to set a cipher list, there is no method available to
161restrict the list of compression method on a per connection basis.
162.PP
163An OpenSSL server will match the identifiers listed by a client against
164its own compression methods and will unconditionally activate compression
165when a matching identifier is found. There is no way to restrict the list
166of compression methods supported on a per connection basis.
167.PP
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168The OpenSSL library has the compression methods \fB\f(BICOMP_rle()\fB\fR and (when
169especially enabled during compilation) \fB\f(BICOMP_zlib()\fB\fR available.
984263bc 170.SH "WARNINGS"
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171.IX Header "WARNINGS"
172Once the identities of the compression methods for the \s-1TLS\s0 protocol have
173been standardized, the compression \s-1API\s0 will most likely be changed. Using
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174it in the current state is not recommended.
175.SH "RETURN VALUES"
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176.IX Header "RETURN VALUES"
177\&\fISSL_COMP_add_compression_method()\fR may return the following values:
178.IP "0" 4
a7d27d5a 179The operation succeeded.
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180.IP "1" 4
181.IX Item "1"
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182The operation failed. Check the error queue to find out the reason.
183.SH "SEE ALSO"
a7d27d5a 184.IX Header "SEE ALSO"
e056f0e0 185\&\fIssl\fR\|(3)