1SMIME_READ_CMS(3)                   OpenSSL                  SMIME_READ_CMS(3)
2
3
4

NAME

6       SMIME_read_CMS - parse S/MIME message
7

SYNOPSIS

9        #include <openssl/cms.h>
10
11        CMS_ContentInfo *SMIME_read_CMS(BIO *in, BIO **bcont);
12

DESCRIPTION

14       SMIME_read_CMS() parses a message in S/MIME format.
15
16       in is a BIO to read the message from.
17
18       If cleartext signing is used then the content is saved in a memory bio
19       which is written to *bcont, otherwise *bcont is set to NULL.
20
21       The parsed CMS_ContentInfo structure is returned or NULL if an error
22       occurred.
23

NOTES

25       If *bcont is not NULL then the message is clear text signed. *bcont can
26       then be passed to CMS_verify() with the CMS_DETACHED flag set.
27
28       Otherwise the type of the returned structure can be determined using
29       CMS_get0_type().
30
31       To support future functionality if bcont is not NULL *bcont should be
32       initialized to NULL. For example:
33
34        BIO *cont = NULL;
35        CMS_ContentInfo *cms;
36
37        cms = SMIME_read_CMS(in, &cont);
38

BUGS

40       The MIME parser used by SMIME_read_CMS() is somewhat primitive.  While
41       it will handle most S/MIME messages more complex compound formats may
42       not work.
43
44       The parser assumes that the CMS_ContentInfo structure is always base64
45       encoded and will not handle the case where it is in binary format or
46       uses quoted printable format.
47
48       The use of a memory BIO to hold the signed content limits the size of
49       message which can be processed due to memory restraints: a streaming
50       single pass option should be available.
51

RETURN VALUES

53       SMIME_read_CMS() returns a valid CMS_ContentInfo structure or NULL if
54       an error occurred. The error can be obtained from ERR_get_error(3).
55

SEE ALSO

57       ERR_get_error(3), CMS_type(3), SMIME_read_CMS(3), CMS_sign(3),
58       CMS_verify(3), CMS_encrypt(3), CMS_decrypt(3)
59

61       Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved.
62
63       Licensed under the OpenSSL license (the "License").  You may not use
64       this file except in compliance with the License.  You can obtain a copy
65       in the file LICENSE in the source distribution or at
66       <https://www.openssl.org/source/license.html>.
67
68
69
701.1.1l                            2021-09-15                 SMIME_READ_CMS(3)
Impressum