1=pod 2 3=head1 NAME 4 5SMIME_read_CMS - parse S/MIME message 6 7=head1 SYNOPSIS 8 9 #include <openssl/cms.h> 10 11 CMS_ContentInfo *SMIME_read_CMS(BIO *in, BIO **bcont); 12 13=head1 DESCRIPTION 14 15SMIME_read_CMS() parses a message in S/MIME format. 16 17B<in> is a BIO to read the message from. 18 19If cleartext signing is used then the content is saved in a memory bio which is 20written to B<*bcont>, otherwise B<*bcont> is set to NULL. 21 22The parsed CMS_ContentInfo structure is returned or NULL if an 23error occurred. 24 25=head1 NOTES 26 27If B<*bcont> is not NULL then the message is clear text signed. B<*bcont> can 28then be passed to CMS_verify() with the B<CMS_DETACHED> flag set. 29 30Otherwise the type of the returned structure can be determined 31using CMS_get0_type(). 32 33To support future functionality if B<bcont> is not NULL B<*bcont> should be 34initialized to NULL. For example: 35 36 BIO *cont = NULL; 37 CMS_ContentInfo *cms; 38 39 cms = SMIME_read_CMS(in, &cont); 40 41=head1 BUGS 42 43The MIME parser used by SMIME_read_CMS() is somewhat primitive. While it will 44handle most S/MIME messages more complex compound formats may not work. 45 46The parser assumes that the CMS_ContentInfo structure is always base64 encoded 47and will not handle the case where it is in binary format or uses quoted 48printable format. 49 50The use of a memory BIO to hold the signed content limits the size of message 51which can be processed due to memory restraints: a streaming single pass option 52should be available. 53 54=head1 RETURN VALUES 55 56SMIME_read_CMS() returns a valid B<CMS_ContentInfo> structure or B<NULL> 57if an error occurred. The error can be obtained from ERR_get_error(3). 58 59=head1 SEE ALSO 60 61L<ERR_get_error(3)>, L<CMS_type(3)>, 62L<SMIME_read_CMS(3)>, L<CMS_sign(3)>, 63L<CMS_verify(3)>, L<CMS_encrypt(3)>, 64L<CMS_decrypt(3)> 65 66=head1 COPYRIGHT 67 68Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved. 69 70Licensed under the OpenSSL license (the "License"). You may not use 71this file except in compliance with the License. You can obtain a copy 72in the file LICENSE in the source distribution or at 73L<https://www.openssl.org/source/license.html>. 74 75=cut 76