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1.\" $OpenBSD: SMIME_read_ASN1.3,v 1.2 2021/12/14 15:22:49 schwarze Exp $
2.\" full merge up to:
3.\" OpenSSL SMIME_read_PKCS7.pod 83cf7abf May 29 13:07:08 2018 +0100
4.\" OpenSSL SMIME_read_CMS.pod b97fdb57 Nov 11 09:33:09 2016 +0100
5.\"
6.\" This file was written by Dr. Stephen Henson <steve@openssl.org>.
7.\" Copyright (c) 2002, 2006, 2008 The OpenSSL Project. All rights reserved.
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53.Dd $Mdocdate: December 14 2021 $
54.Dt SMIME_READ_ASN1 3
55.Os
56.Sh NAME
57.Nm SMIME_read_ASN1
58.Nd generic S/MIME message parser
59.Sh SYNOPSIS
60.In openssl/asn1.h
61.Ft ASN1_VALUE *
62.Fo SMIME_read_ASN1
63.Fa "BIO *in_bio"
64.Fa "BIO **out_bio"
65.Fa "const ASN1_ITEM *it"
66.Fc
67.Sh DESCRIPTION
68.Fn SMIME_read_ASN1
69reads a message in S/MIME format from
70.Fa in_bio .
71.Pp
72If the message uses cleartext signing, the content is saved in a memory
73.Vt BIO
74which is written to
75.Pf * Fa out_bio .
76Otherwise,
77.Pf * Fa out_bio
78is set to
79.Dv NULL .
80.Pp
81To support future functionality, if
82.Fa out_bio
83is not
84.Dv NULL ,
85.Pf * Fa out_bio
86should be initialized to
87.Dv NULL
88before calling
89.Fn SMIME_read_ASN1 .
90.Sh RETURN VALUES
91.Fn SMIME_read_ASN1
92returns a newly allocated object of type
93.Fa it
94or
95.Dv NULL
96if an error occurred.
97The error can be obtained from
98.Xr ERR_get_error 3 .
99.Sh SEE ALSO
100.Xr ASN1_item_d2i_bio 3 ,
101.Xr BIO_f_base64 3 ,
102.Xr BIO_new 3 ,
103.Xr SMIME_read_CMS 3 ,
104.Xr SMIME_read_PKCS7 3 ,
105.Xr SMIME_text 3
106.Sh HISTORY
107.Fn SMIME_read_ASN1
108first appeared in OpenSSL 0.9.8h and has been available since
109.Ox 4.5 .
110.Sh BUGS
111The MIME parser used by
112.Fn SMIME_read_ASN1
113is somewhat primitive.
114While it will handle most S/MIME messages, more complex compound
115formats may not work.
116.Pp
117The parser assumes that the
118structure is always base64 encoded, and it will not handle the case
119where it is in binary format or uses quoted printable format.
120.Pp
121The use of a memory
122to hold the signed content limits the size of the message which can
123be processed due to memory restraints: a streaming single pass
124option should be available.