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1.\" $OpenBSD: CMS_encrypt.3,v 1.7 2019/11/02 15:39:46 schwarze Exp $
2.\" full merge up to: OpenSSL 83cf7abf May 29 13:07:08 2018 +0100
3.\"
4.\" This file was written by Dr. Stephen Henson <steve@openssl.org>.
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51.Dd $Mdocdate: November 2 2019 $
52.Dt CMS_ENCRYPT 3
53.Os
54.Sh NAME
55.Nm CMS_encrypt
56.Nd create a CMS EnvelopedData structure
57.Sh SYNOPSIS
58.In openssl/cms.h
59.Ft CMS_ContentInfo *
60.Fo CMS_encrypt
61.Fa "STACK_OF(X509) *certificates"
62.Fa "BIO *in"
63.Fa "const EVP_CIPHER *cipher"
64.Fa "unsigned int flags"
65.Fc
66.Sh DESCRIPTION
67.Fn CMS_encrypt
68creates a CMS
69.Vt EnvelopedData
70structure, encrypting the content provided by
71.Fa in .
72.Pp
73The recipient
74.Fa certificates
75are added as
76.Vt KeyTransRecipientInfo
77structures by calling the function
78.Xr CMS_add1_recipient_cert 3
79internally.
80Only certificates carrying RSA, Diffie-Hellman or EC keys are supported
81by this function.
82The
83.Fa certificates
84argument can be set to
85.Dv NULL
86if the
87.Dv CMS_PARTIAL
88flag is set and recipients are added later using
89.Xr CMS_add1_recipient_cert 3
90or
91.Xr CMS_add0_recipient_key 3 .
92.Pp
93.Fa cipher
94is the symmetric cipher to use.
95It must support ASN.1 encoding of its parameters.
96.Xr EVP_des_ede3_cbc 3
97(triple DES) is the algorithm of choice for S/MIME use because most
98clients support it.
99.Pp
100Many browsers implement a "sign and encrypt" option which is simply an
101S/MIME
102.Vt EnvelopedData
103containing an S/MIME signed message.
104This can be readily produced by storing the S/MIME signed message in a
105memory BIO and passing it to
106.Fn CMS_encrypt .
107.Pp
108The following flags can be passed in the
109.Fa flags
110parameter:
111.Bl -tag -width Ds
112.It Dv CMS_TEXT
113MIME headers for type text/plain are prepended to the data.
114.It Dv CMS_BINARY
115Do not translate the supplied content into MIME canonical format
116even though that is required by the S/MIME specifications.
117This option should be used if the supplied data is in binary format.
118Otherwise, the translation will corrupt it.
119If
120.Dv CMS_BINARY
121is set, then
122.Dv CMS_TEXT
123is ignored.
124.It Dv CMS_USE_KEYID
125Use the subject key identifier value to identify recipient certificates.
126An error occurs if all recipient certificates do not have a subject key
127identifier extension.
128By default, issuer name and serial number are used instead.
129.It Dv CMS_STREAM
130Return a partial
131.Vt CMS_ContentInfo
132structure suitable for streaming I/O: no data is read from the BIO
133.Fa in .
134Several functions including
135.Xr SMIME_write_CMS 3 ,
136.Xr i2d_CMS_bio_stream 3 ,
137or
138.Xr PEM_write_bio_CMS_stream 3
139can be used to finalize the structure.
140Alternatively, finalization can be performed by obtaining the streaming
141ASN1
142.Vt BIO
143directly using
144.Xr BIO_new_CMS 3 .
145Outputting the content of the returned
146.Vt CMS_ContentInfo
147structure via a function that does not properly finalize it
148will give unpredictable results.
149.It Dv CMS_PARTIAL
150Return a partial
151.Vt CMS_ContentInfo
152structure to which additional recipients and attributes can
153be added before finalization.
154.It Dv CMS_DETACHED
155Omit the data being encrypted from the
156.Vt CMS_ContentInfo
157structure.
158This is rarely used in practice and is not supported by
159.Xr SMIME_write_CMS 3 .
160.El
161.Sh RETURN VALUES
162.Fn CMS_encrypt
163returns either a
164.Vt CMS_ContentInfo
165structure or
166.Dv NULL
167if an error occurred.
168The error can be obtained from
169.Xr ERR_get_error 3 .
170.Sh SEE ALSO
171.Xr CMS_add0_cert 3 ,
172.Xr CMS_add1_recipient_cert 3 ,
173.Xr CMS_ContentInfo_new 3 ,
174.Xr CMS_decrypt 3
175.Sh STANDARDS
176RFC 5652: Cryptographic Message Syntax (CMS)
177.Bl -dash -compact -offset indent
178.It
179section 6.1: EnvelopedData Type
180.It
181section 6.2.1: KeyTransRecipientInfo Type
182.El
183.Sh HISTORY
184.Fn CMS_encrypt
185first appeared in OpenSSL 0.9.8h
186and has been available since
187.Ox 6.7 .
188.Pp
189The
190.Dv CMS_STREAM
191flag first appeared in OpenSSL 1.0.0.
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