.\" -*- mode: troff; coding: utf-8 -*-
.\" Automatically generated by Pod::Man 5.01 (Pod::Simple 3.43)
.\"
.\" Standard preamble:
.\" ========================================================================
.de Sp \" Vertical space (when we can't use .PP)
.if t .sp .5v
.if n .sp
..
.de Vb \" Begin verbatim text
.ft CW
.nf
.ne \\$1
..
.de Ve \" End verbatim text
.ft R
.fi
..
.\" \*(C` and \*(C' are quotes in nroff, nothing in troff, for use with C<>.
.ie n \{\
.    ds C` ""
.    ds C' ""
'br\}
.el\{\
.    ds C`
.    ds C'
'br\}
.\"
.\" Escape single quotes in literal strings from groff's Unicode transform.
.ie \n(.g .ds Aq \(aq
.el       .ds Aq '
.\"
.\" If the F register is >0, we'll generate index entries on stderr for
.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
.\" entries marked with X<> in POD.  Of course, you'll have to process the
.\" output yourself in some meaningful fashion.
.\"
.\" Avoid warning from groff about undefined register 'F'.
.de IX
..
.nr rF 0
.if \n(.g .if rF .nr rF 1
.if (\n(rF:(\n(.g==0)) \{\
.    if \nF \{\
.        de IX
.        tm Index:\\$1\t\\n%\t"\\$2"
..
.        if !\nF==2 \{\
.            nr % 0
.            nr F 2
.        \}
.    \}
.\}
.rr rF
.\" ========================================================================
.\"
.IX Title "SMIME_read_PKCS7 3"
.TH SMIME_read_PKCS7 3 2019-12-20 1.0.2u OpenSSL
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH NAME
SMIME_read_PKCS7 \- parse S/MIME message.
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/pkcs7.h>
\&
\& PKCS7 *SMIME_read_PKCS7(BIO *in, BIO **bcont);
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
\&\fBSMIME_read_PKCS7()\fR parses a message in S/MIME format.
.PP
\&\fBin\fR is a BIO to read the message from.
.PP
If cleartext signing is used then the content is saved in
a memory bio which is written to \fB*bcont\fR, otherwise
\&\fB*bcont\fR is set to \fBNULL\fR.
.PP
The parsed PKCS#7 structure is returned or \fBNULL\fR if an
error occurred.
.SH NOTES
.IX Header "NOTES"
If \fB*bcont\fR is not \fBNULL\fR then the message is clear text
signed. \fB*bcont\fR can then be passed to \fBPKCS7_verify()\fR with
the \fBPKCS7_DETACHED\fR flag set.
.PP
Otherwise the type of the returned structure can be determined
using \fBPKCS7_type()\fR.
.PP
To support future functionality if \fBbcont\fR is not \fBNULL\fR
\&\fB*bcont\fR should be initialized to \fBNULL\fR. For example:
.PP
.Vb 2
\& BIO *cont = NULL;
\& PKCS7 *p7;
\&
\& p7 = SMIME_read_PKCS7(in, &cont);
.Ve
.SH BUGS
.IX Header "BUGS"
The MIME parser used by \fBSMIME_read_PKCS7()\fR is somewhat primitive.
While it will handle most S/MIME messages more complex compound
formats may not work.
.PP
The parser assumes that the PKCS7 structure is always base64
encoded and will not handle the case where it is in binary format
or uses quoted printable format.
.PP
The use of a memory BIO to hold the signed content limits the size
of message which can be processed due to memory restraints: a
streaming single pass option should be available.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBSMIME_read_PKCS7()\fR returns a valid \fBPKCS7\fR structure or \fBNULL\fR
if an error occurred. The error can be obtained from \fBERR_get_error\fR\|(3).
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBERR_get_error\fR\|(3), \fBPKCS7_type\fR\|(3)
\&\fBSMIME_read_PKCS7\fR\|(3), \fBPKCS7_sign\fR\|(3),
\&\fBPKCS7_verify\fR\|(3), \fBPKCS7_encrypt\fR\|(3)
\&\fBPKCS7_decrypt\fR\|(3)
.SH HISTORY
.IX Header "HISTORY"
\&\fBSMIME_read_PKCS7()\fR was added to OpenSSL 0.9.5