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1.\" $OpenBSD: BIO_new_CMS.3,v 1.9 2023/05/01 07:28:11 tb Exp $
2.\" full merge up to: OpenSSL df75c2bfc Dec 9 01:02:36 2018 +0100
3.\"
4.\" This file was written by Dr. Stephen Henson <steve@openssl.org>.
5.\" Copyright (c) 2008 The OpenSSL Project. All rights reserved.
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50.\"
51.Dd $Mdocdate: May 1 2023 $
52.Dt BIO_NEW_CMS 3
53.Os
54.Sh NAME
55.Nm BIO_new_CMS
56.Nd CMS streaming filter BIO
57.Sh SYNOPSIS
58.In openssl/cms.h
59.Ft BIO *
60.Fo BIO_new_CMS
61.Fa "BIO *out"
62.Fa "CMS_ContentInfo *cms"
63.Fc
64.Sh DESCRIPTION
65.Fn BIO_new_CMS
66returns a streaming filter
67.Vt BIO
68chain based on
69.Fa cms .
70The output of the filter is written to
71.Fa out .
72Any data written to the chain is automatically translated
73to a BER format CMS structure of the appropriate type.
74.Pp
75The chain returned by this function behaves like a standard filter
76.Vt BIO .
77It supports non blocking I/O.
78Content is processed and streamed on the fly and not all held in memory
79at once: so it is possible to encode very large structures.
80After all content has been written through the chain,
81.Xr BIO_flush 3
82must be called to finalise the structure.
83.Pp
84The
85.Dv CMS_STREAM
86flag must be included in the corresponding
87.Fa flags
88parameter of the
89.Fa cms
90creation function.
91.Pp
92If an application wishes to write additional data to
93.Fa out ,
94BIOs should be removed from the chain using
95.Xr BIO_pop 3
96and freed with
97.Xr BIO_free 3
98until
99.Fa out
100is reached.
101If no additional data needs to be written,
102.Xr BIO_free_all 3
103can be called to free up the whole chain.
104.Pp
105Any content written through the filter is used verbatim:
106no canonical translation is performed.
107.Pp
108It is possible to chain multiple BIOs to, for example,
109create a triple wrapped signed, enveloped, signed structure.
110In this case it is the application's responsibility
111to set the inner content type of any outer
112.Vt CMS_ContentInfo
113structures.
114.Pp
115Large numbers of small writes through the chain should be avoided as this
116will produce an output consisting of lots of OCTET STRING structures.
117Prepending a
118.Xr BIO_f_buffer 3
119buffering BIO will prevent this.
120.Sh RETURN VALUES
121.Fn BIO_new_CMS
122returns a
123.Vt BIO
124chain when successful or
125.Dv NULL
126if an error occurred.
127The error can be obtained from
128.Xr ERR_get_error 3 .
129.Sh SEE ALSO
130.Xr BIO_new 3 ,
131.Xr CMS_ContentInfo_new 3 ,
132.Xr CMS_encrypt 3 ,
133.Xr CMS_sign 3
134.Sh HISTORY
135.Fn BIO_new_CMS
136first appeared in OpenSSL 1.0.0
137and has been available since
138.Ox 6.7 .
139.Sh BUGS
140There is currently no corresponding inverse BIO
141which can decode a CMS structure on the fly.
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