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1.\" $OpenBSD: CMS_compress.3,v 1.7 2019/11/02 15:39:46 schwarze Exp $
2.\" full merge up to: OpenSSL 99d63d46 Oct 26 13:56:48 2016 -0400
3.\"
4.\" This file is a derived work.
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7.\" Copyright (c) 2019 Ingo Schwarze <schwarze@openbsd.org>
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21.\" The original file was written by Dr. Stephen Henson <steve@openssl.org>.
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68.Dd $Mdocdate: November 2 2019 $
69.Dt CMS_COMPRESS 3
70.Os
71.Sh NAME
72.Nm CMS_compress
73.Nd create a CMS CompressedData structure
74.Sh SYNOPSIS
75.In openssl/cms.h
76.Ft CMS_ContentInfo *
77.Fo CMS_compress
78.Fa "BIO *in"
79.Fa "int comp_nid"
80.Fa "unsigned int flags"
81.Fc
82.Sh DESCRIPTION
83.Fn CMS_compress
84creates and returns a CMS
85.Vt CompressedData
86structure.
87.Pp
88.Fa comp_nid
89is the compression algorithm to use or
90.Dv NID_undef
91to use the default algorithm.
92Currently, the default algorithm
93.Dv NID_zlib_compression
94is the only supported algorithm.
95If zlib support is not compiled in,
96.Fn CMS_compress
97always returns an error.
98.Pp
99.Fa in
100provides the content to be compressed.
101.Pp
102Any of the following flags (OR'ed together) can be passed in the
103.Fa flags
104parameter:
105.Bl -tag -width Ds
106.It Dv CMS_TEXT
107Prepend MIME headers for type text/plain to the data.
108.It Dv CMS_BINARY
109Do not translate the supplied content into MIME canonical format,
110even though that is required by the S/MIME specifications.
111This option should be used if the supplied data is in binary format.
112Otherwise, the translation will corrupt it.
113If
114.Dv CMS_BINARY
115is set,
116.Dv CMS_TEXT
117is ignored.
118.It Dv CMS_STREAM
119Return a partial
120.Vt CMS_ContentInfo
121structure suitable for streaming I/O: no data is read from
122.Fa in .
123Several functions including
124.Xr SMIME_write_CMS 3 ,
125.Xr i2d_CMS_bio_stream 3 ,
126or
127.Xr PEM_write_bio_CMS_stream 3
128can be used to finalize the structure.
129Alternatively, finalization can be performed by obtaining the streaming
130ASN1
131.Vt BIO
132directly using
133.Xr BIO_new_CMS 3 .
134Outputting the contents of the
135.Vt CMS_ContentInfo
136structure via a function that does not
137properly finalize it will give unpredictable results.
138.It Dv CMS_DETACHED
139Do not include the compressed data in the
140.Vt CMS_ContentInfo
141structure.
142This is rarely used in practice and is not supported by
143.Xr SMIME_write_CMS 3 .
144.El
145.Pp
146Additional compression parameters such as the zlib compression level
147cannot currently be set.
148.Sh RETURN VALUES
149.Fn CMS_compress
150returns either a
151.Vt CMS_ContentInfo
152structure or
153.Dv NULL
154if an error occurred.
155The error can be obtained from
156.Xr ERR_get_error 3 .
157.Sh SEE ALSO
158.Xr CMS_ContentInfo_new 3 ,
159.Xr CMS_uncompress 3
160.Sh STANDARDS
161RFC 3274: Compressed Data Content Type for Cryptographic Message Syntax (CMS)
162.Sh HISTORY
163.Fn CMS_compress
164first appeared in OpenSSL 0.9.8h
165and has been available since
166.Ox 6.7 .
167.Pp
168The
169.Dv CMS_STREAM
170flag first appeared in OpenSSL 1.0.0.
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-12-23 13:33:21 +0000