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136 .IX Title "SMIME_read_CMS 3"
137 .TH SMIME_read_CMS 3 "2008-04-10" "1.1.0-dev" "OpenSSL"
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144 \& SMIME_read_CMS \- parse S/MIME message.
149 .IX Header "SYNOPSIS"
151 \& #include <openssl/cms.h>
153 \& CMS_ContentInfo *SMIME_read_CMS(BIO *in, BIO **bcont);
156 .IX Header "DESCRIPTION"
157 \&\fISMIME_read_CMS()\fR parses a message in S/MIME format.
159 \&\fBin\fR is a \s-1BIO\s0 to read the message from.
161 If cleartext signing is used then the content is saved in a memory bio which is
162 written to \fB*bcont\fR, otherwise \fB*bcont\fR is set to \s-1NULL\s0.
164 The parsed CMS_ContentInfo structure is returned or \s-1NULL\s0 if an
168 If \fB*bcont\fR is not \s-1NULL\s0 then the message is clear text signed. \fB*bcont\fR can
169 then be passed to \fICMS_verify()\fR with the \fB\s-1CMS_DETACHED\s0\fR flag set.
171 Otherwise the type of the returned structure can be determined
172 using \fICMS_get0_type()\fR.
174 To support future functionality if \fBbcont\fR is not \s-1NULL\s0 \fB*bcont\fR should be
175 initialized to \s-1NULL\s0. For example:
179 \& CMS_ContentInfo *cms;
181 \& cms = SMIME_read_CMS(in, &cont);
185 The \s-1MIME\s0 parser used by \fISMIME_read_CMS()\fR is somewhat primitive. While it will
186 handle most S/MIME messages more complex compound formats may not work.
188 The parser assumes that the CMS_ContentInfo structure is always base64 encoded
189 and will not handle the case where it is in binary format or uses quoted
192 The use of a memory \s-1BIO\s0 to hold the signed content limits the size of message
193 which can be processed due to memory restraints: a streaming single pass option
196 .IX Header "RETURN VALUES"
197 \&\fISMIME_read_CMS()\fR returns a valid \fBCMS_ContentInfo\fR structure or \fB\s-1NULL\s0\fR
198 if an error occurred. The error can be obtained from \fIERR_get_error\fR\|(3).
200 .IX Header "SEE ALSO"
201 \&\fIERR_get_error\fR\|(3), \fICMS_type\fR\|(3)
202 \&\fISMIME_read_CMS\fR\|(3), \fICMS_sign\fR\|(3),
203 \&\fICMS_verify\fR\|(3), \fICMS_encrypt\fR\|(3)
204 \&\fICMS_decrypt\fR\|(3)
207 \&\fISMIME_read_CMS()\fR was added to OpenSSL 0.9.8