Update files for OpenSSL-1.0.0f import.
[dragonfly.git] / secure / lib / libcrypto / man / SMIME_read_CMS.3
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124.\" ========================================================================
125.\"
126.IX Title "SMIME_read_CMS 3"
e3261593 127.TH SMIME_read_CMS 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.
130.if n .ad l
131.nh
132.SH "NAME"
133.Vb 1
134\& SMIME_read_CMS \- parse S/MIME message.
135.Ve
136.SH "SYNOPSIS"
137.IX Header "SYNOPSIS"
138.Vb 1
139\& #include <openssl/cms.h>
140\&
141\& CMS_ContentInfo *SMIME_read_CMS(BIO *in, BIO **bcont);
142.Ve
143.SH "DESCRIPTION"
144.IX Header "DESCRIPTION"
145\&\fISMIME_read_CMS()\fR parses a message in S/MIME format.
146.PP
147\&\fBin\fR is a \s-1BIO\s0 to read the message from.
148.PP
149If cleartext signing is used then the content is saved in a memory bio which is
150written to \fB*bcont\fR, otherwise \fB*bcont\fR is set to \s-1NULL\s0.
151.PP
152The parsed CMS_ContentInfo structure is returned or \s-1NULL\s0 if an
153error occurred.
154.SH "NOTES"
155.IX Header "NOTES"
156If \fB*bcont\fR is not \s-1NULL\s0 then the message is clear text signed. \fB*bcont\fR can
157then be passed to \fICMS_verify()\fR with the \fB\s-1CMS_DETACHED\s0\fR flag set.
158.PP
159Otherwise the type of the returned structure can be determined
160using \fICMS_get0_type()\fR.
161.PP
162To support future functionality if \fBbcont\fR is not \s-1NULL\s0 \fB*bcont\fR should be
163initialized to \s-1NULL\s0. For example:
164.PP
165.Vb 2
166\& BIO *cont = NULL;
167\& CMS_ContentInfo *cms;
168\&
169\& cms = SMIME_read_CMS(in, &cont);
170.Ve
171.SH "BUGS"
172.IX Header "BUGS"
173The \s-1MIME\s0 parser used by \fISMIME_read_CMS()\fR is somewhat primitive. While it will
174handle most S/MIME messages more complex compound formats may not work.
175.PP
176The parser assumes that the CMS_ContentInfo structure is always base64 encoded
177and will not handle the case where it is in binary format or uses quoted
178printable format.
179.PP
180The use of a memory \s-1BIO\s0 to hold the signed content limits the size of message
181which can be processed due to memory restraints: a streaming single pass option
182should be available.
183.SH "RETURN VALUES"
184.IX Header "RETURN VALUES"
185\&\fISMIME_read_CMS()\fR returns a valid \fBCMS_ContentInfo\fR structure or \fB\s-1NULL\s0\fR
186if an error occurred. The error can be obtained from \fIERR_get_error\fR\|(3).
187.SH "SEE ALSO"
188.IX Header "SEE ALSO"
189\&\fIERR_get_error\fR\|(3), \fICMS_type\fR\|(3)
190\&\fISMIME_read_CMS\fR\|(3), \fICMS_sign\fR\|(3),
191\&\fICMS_verify\fR\|(3), \fICMS_encrypt\fR\|(3)
192\&\fICMS_decrypt\fR\|(3)
193.SH "HISTORY"
194.IX Header "HISTORY"
195\&\fISMIME_read_CMS()\fR was added to OpenSSL 0.9.8