Android_verify/third_party/android-libs/share/man/man3/SMIME_read_CMS.3ossl

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.\" ========================================================================
.\"
.IX Title "SMIME_READ_CMS 3ossl"
.TH SMIME_READ_CMS 3ossl "2024-09-03" "3.3.2" "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_CMS_ex, SMIME_read_CMS \- parse S/MIME message
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/cms.h>
\&
\& CMS_ContentInfo *SMIME_read_CMS_ex(BIO *bio, int flags, BIO **bcont,
\&                                    CMS_ContentInfo **cms);
\& CMS_ContentInfo *SMIME_read_CMS(BIO *in, BIO **bcont);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBSMIME_read_CMS()\fR parses a message in S/MIME format.
.PP
\&\fBin\fR is a \s-1BIO\s0 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 \s-1NULL.\s0
.PP
The parsed CMS_ContentInfo structure is returned or \s-1NULL\s0 if an
error occurred.
.PP
\&\fBSMIME_read_CMS_ex()\fR is similar to \fBSMIME_read_CMS()\fR but optionally a previously
created \fIcms\fR CMS_ContentInfo object can be supplied as well as some \fIflags\fR.
To create a \fIcms\fR object use \fBCMS_ContentInfo_new_ex\fR\|(3).
If the \fIflags\fR argument contains \fB\s-1CMS_BINARY\s0\fR then the input is assumed to be
in binary format and is not translated to canonical form.
If in addition \fB\s-1SMIME_ASCIICRLF\s0\fR is set then the binary input is assumed
to be followed by \fB\s-1CR\s0\fR and \fB\s-1LF\s0\fR characters, else only by an \fB\s-1LF\s0\fR character.
If \fIflags\fR is 0 and \fIcms\fR is \s-1NULL\s0 then it is identical to \fBSMIME_read_CMS()\fR.
.SH "NOTES"
.IX Header "NOTES"
If \fB*bcont\fR is not \s-1NULL\s0 then the message is clear text signed. \fB*bcont\fR can
then be passed to \fBCMS_verify()\fR with the \fB\s-1CMS_DETACHED\s0\fR flag set.
.PP
Otherwise the type of the returned structure can be determined
using \fBCMS_get0_type()\fR.
.PP
To support future functionality if \fBbcont\fR is not \s-1NULL\s0 \fB*bcont\fR should be
initialized to \s-1NULL.\s0 For example:
.PP
.Vb 2
\& BIO *cont = NULL;
\& CMS_ContentInfo *cms;
\&
\& cms = SMIME_read_CMS(in, &cont);
.Ve
.SH "BUGS"
.IX Header "BUGS"
The \s-1MIME\s0 parser used by \fBSMIME_read_CMS()\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 CMS_ContentInfo 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 \s-1BIO\s0 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_CMS_ex()\fR and \fBSMIME_read_CMS()\fR return a valid \fBCMS_ContentInfo\fR
structure or \fB\s-1NULL\s0\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),
\&\fBCMS_sign\fR\|(3),
\&\fBCMS_verify\fR\|(3),
\&\fBCMS_encrypt\fR\|(3),
\&\fBCMS_decrypt\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
The function \fBSMIME_read_CMS_ex()\fR was added in OpenSSL 3.0.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2008\-2021 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.