mirror of
https://github.com/openssl/openssl.git
synced 2024-12-09 05:51:54 +08:00
74 lines
1.9 KiB
Plaintext
74 lines
1.9 KiB
Plaintext
=pod
|
|
|
|
=head1 NAME
|
|
|
|
SMIME_read_PKCS7 - parse S/MIME message.
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/pkcs7.h>
|
|
|
|
PKCS7 *SMIME_read_PKCS7(BIO *in, BIO **bcont);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
SMIME_read_PKCS7() parses a message in S/MIME format.
|
|
|
|
B<in> is a BIO to read the message from.
|
|
|
|
If cleartext signing is used then the content is saved in
|
|
a memory bio which is written to B<*bcont>, otherwise
|
|
B<*bcont> is set to B<NULL>.
|
|
|
|
The parsed PKCS#7 structure is returned or B<NULL> if an
|
|
error occurred.
|
|
|
|
=head1 NOTES
|
|
|
|
If B<*bcont> is not B<NULL> then the message is clear text
|
|
signed. B<*bcont> can then be passed to PKCS7_verify() with
|
|
the B<PKCS7_DETACHED> flag set.
|
|
|
|
Otherwise the type of the returned structure can be determined
|
|
using PKCS7_type().
|
|
|
|
To support future functionality if B<bcont> is not B<NULL>
|
|
B<*bcont> should be initialized to B<NULL>. For example:
|
|
|
|
BIO *cont = NULL;
|
|
PKCS7 *p7;
|
|
|
|
p7 = SMIME_read_PKCS7(in, &cont);
|
|
|
|
=head1 BUGS
|
|
|
|
The MIME parser used by SMIME_read_PKCS7() is somewhat primitive.
|
|
While it will handle most S/MIME messages more complex compound
|
|
formats may not work.
|
|
|
|
The parser assumes that the PKCS7 structure is always base64
|
|
encoded and will not handle the case where it is in binary format
|
|
or uses quoted printable format.
|
|
|
|
The use of a memory BIO 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.
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
SMIME_read_PKCS7() returns a valid B<PKCS7> structure or B<NULL>
|
|
is an error occurred. The error can be obtained from ERR_get_error(3).
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<ERR_get_error(3)|ERR_get_error(3)>, L<PKCS7_type(3)|PKCS7_type(3)>
|
|
L<SMIME_read_PKCS7(3)|SMIME_read_PKCS7(3)>, L<PKCS7_sign(3)|PKCS7_sign(3)>,
|
|
L<PKCS7_verify(3)|PKCS7_verify(3)>, L<PKCS7_encrypt(3)|PKCS7_encrypt(3)>
|
|
L<PKCS7_decrypt(3)|PKCS7_decrypt(3)>
|
|
|
|
=head1 HISTORY
|
|
|
|
SMIME_read_PKCS7() was added to OpenSSL 0.9.5
|
|
|
|
=cut
|