1SMIME_READ_PKCS7(3)                 OpenSSL                SMIME_READ_PKCS7(3)
2
3
4

NAME

6       SMIME_read_PKCS7 - parse S/MIME message
7

SYNOPSIS

9        #include <openssl/pkcs7.h>
10
11        PKCS7 *SMIME_read_PKCS7(BIO *in, BIO **bcont);
12

DESCRIPTION

14       SMIME_read_PKCS7() 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 PKCS#7 structure is returned or NULL if an error occurred.
22

NOTES

24       If *bcont is not NULL then the message is clear text signed. *bcont can
25       then be passed to PKCS7_verify() with the PKCS7_DETACHED flag set.
26
27       Otherwise the type of the returned structure can be determined using
28       PKCS7_type_is_enveloped(), etc.
29
30       To support future functionality if bcont is not NULL *bcont should be
31       initialized to NULL. For example:
32
33        BIO *cont = NULL;
34        PKCS7 *p7;
35
36        p7 = SMIME_read_PKCS7(in, &cont);
37

BUGS

39       The MIME parser used by SMIME_read_PKCS7() is somewhat primitive.
40       While it will handle most S/MIME messages more complex compound formats
41       may not work.
42
43       The parser assumes that the PKCS7 structure is always base64 encoded
44       and will not handle the case where it is in binary format or uses
45       quoted printable format.
46
47       The use of a memory BIO to hold the signed content limits the size of
48       message which can be processed due to memory restraints: a streaming
49       single pass option should be available.
50

RETURN VALUES

52       SMIME_read_PKCS7() returns a valid PKCS7 structure or NULL if an error
53       occurred. The error can be obtained from ERR_get_error(3).
54

SEE ALSO

56       ERR_get_error(3), SMIME_read_PKCS7(3), PKCS7_sign(3), PKCS7_verify(3),
57       PKCS7_encrypt(3) PKCS7_decrypt(3)
58
60       Copyright 2002-2018 The OpenSSL Project Authors. All Rights Reserved.
61
62       Licensed under the OpenSSL license (the "License").  You may not use
63       this file except in compliance with the License.  You can obtain a copy
64       in the file LICENSE in the source distribution or at
65       <https://www.openssl.org/source/license.html>.
66
67
68
691.1.1k                            2021-03-26               SMIME_READ_PKCS7(3)
Impressum