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.\" ========================================================================
.\"
.IX Title "SMIME_READ_ASN1 3"
.TH SMIME_READ_ASN1 3 "2023-08-01" "3.0.10" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
SMIME_read_ASN1_ex, SMIME_read_ASN1
\&\- parse S/MIME message
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/asn1.h>
\&
\& ASN1_VALUE *SMIME_read_ASN1_ex(BIO *in, int flags, BIO **bcont,
\&                                const ASN1_ITEM *it, ASN1_VALUE **x,
\&                                OSSL_LIB_CTX *libctx, const char *propq);
\& ASN1_VALUE *SMIME_read_ASN1(BIO *in, BIO **bcont, const ASN1_ITEM *it);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBSMIME_read_ASN1_ex()\fR parses a message in S/MIME format.
.PP
\&\fIin\fR is a \s-1BIO\s0 to read the message from.
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.
\&\fIx\fR can be used to optionally supply
a previously created \fIit\fR \s-1ASN1_VALUE\s0 object (such as CMS_ContentInfo or \s-1PKCS7\s0),
it can be set to \s-1NULL.\s0 Valid values that can be used by \s-1ASN.1\s0 structure \fIit\fR
are ASN1_ITEM_rptr(\s-1PKCS7\s0) or ASN1_ITEM_rptr(CMS_ContentInfo). Any algorithm
fetches that occur during the operation will use the \fB\s-1OSSL_LIB_CTX\s0\fR supplied in
the \fIlibctx\fR parameter, and use the property query string \fIpropq\fR See
\&\*(L"\s-1ALGORITHM FETCHING\*(R"\s0 in \fBcrypto\fR\|(7) for further details about algorithm fetching.
.PP
If cleartext signing is used then the content is saved in a memory bio which is
written to \fI*bcont\fR, otherwise \fI*bcont\fR is set to \s-1NULL.\s0
.PP
The parsed \s-1ASN1_VALUE\s0 structure is returned or \s-1NULL\s0 if an error occurred.
.PP
\&\fBSMIME_read_ASN1()\fR is similar to \fBSMIME_read_ASN1_ex()\fR but sets the value of \fIx\fR
to \s-1NULL\s0 and the value of \fIflags\fR to 0.
.SH "NOTES"
.IX Header "NOTES"
The higher level functions \fBSMIME_read_CMS_ex\fR\|(3) and
\&\fBSMIME_read_PKCS7_ex\fR\|(3) should be used instead of \fBSMIME_read_ASN1_ex()\fR.
.PP
To support future functionality if \fIbcont\fR is not \s-1NULL\s0 \fI*bcont\fR should be
initialized to \s-1NULL.\s0
.SH "BUGS"
.IX Header "BUGS"
The \s-1MIME\s0 parser used by \fBSMIME_read_ASN1_ex()\fR is somewhat primitive. While it will
handle most S/MIME messages more complex compound formats may not work.
.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_ASN1_ex()\fR and \fBSMIME_read_ASN1()\fR return a valid \fB\s-1ASN1_VALUE\s0\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),
\&\fBSMIME_read_CMS_ex\fR\|(3),
\&\fBSMIME_read_PKCS7_ex\fR\|(3),
\&\fBSMIME_write_ASN1\fR\|(3),
\&\fBSMIME_write_ASN1_ex\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
The function \fBSMIME_read_ASN1_ex()\fR was added in OpenSSL 3.0.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2020\-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>.