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135 .IX Title "SMIME_read_PKCS7 3"
136 .TH SMIME_read_PKCS7 3 "2015-03-19" "1.0.1m" "OpenSSL"
137 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
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142 SMIME_read_PKCS7 \- parse S/MIME message.
144 .IX Header "SYNOPSIS"
146 \& #include <openssl/pkcs7.h>
148 \& PKCS7 *SMIME_read_PKCS7(BIO *in, BIO **bcont);
151 .IX Header "DESCRIPTION"
152 \&\fISMIME_read_PKCS7()\fR parses a message in S/MIME format.
154 \&\fBin\fR is a \s-1BIO\s0 to read the message from.
156 If cleartext signing is used then the content is saved in
157 a memory bio which is written to \fB*bcont\fR, otherwise
158 \&\fB*bcont\fR is set to \fB\s-1NULL\s0\fR.
160 The parsed PKCS#7 structure is returned or \fB\s-1NULL\s0\fR if an
164 If \fB*bcont\fR is not \fB\s-1NULL\s0\fR then the message is clear text
165 signed. \fB*bcont\fR can then be passed to \fIPKCS7_verify()\fR with
166 the \fB\s-1PKCS7_DETACHED\s0\fR flag set.
168 Otherwise the type of the returned structure can be determined
169 using \fIPKCS7_type()\fR.
171 To support future functionality if \fBbcont\fR is not \fB\s-1NULL\s0\fR
172 \&\fB*bcont\fR should be initialized to \fB\s-1NULL\s0\fR. For example:
178 \& p7 = SMIME_read_PKCS7(in, &cont);
182 The \s-1MIME\s0 parser used by \fISMIME_read_PKCS7()\fR is somewhat primitive.
183 While it will handle most S/MIME messages more complex compound
184 formats may not work.
186 The parser assumes that the \s-1PKCS7\s0 structure is always base64
187 encoded and will not handle the case where it is in binary format
188 or uses quoted printable format.
190 The use of a memory \s-1BIO\s0 to hold the signed content limits the size
191 of message which can be processed due to memory restraints: a
192 streaming single pass option should be available.
194 .IX Header "RETURN VALUES"
195 \&\fISMIME_read_PKCS7()\fR returns a valid \fB\s-1PKCS7\s0\fR structure or \fB\s-1NULL\s0\fR
196 is an error occurred. The error can be obtained from \fIERR_get_error\fR\|(3).
198 .IX Header "SEE ALSO"
199 \&\fIERR_get_error\fR\|(3), \fIPKCS7_type\fR\|(3)
200 \&\fISMIME_read_PKCS7\fR\|(3), \fIPKCS7_sign\fR\|(3),
201 \&\fIPKCS7_verify\fR\|(3), \fIPKCS7_encrypt\fR\|(3)
202 \&\fIPKCS7_decrypt\fR\|(3)
205 \&\fISMIME_read_PKCS7()\fR was added to OpenSSL 0.9.5