=pod =head1 NAME SMIME_read_CMS - parse S/MIME message =head1 SYNOPSIS #include CMS_ContentInfo *SMIME_read_CMS(BIO *in, BIO **bcont); =head1 DESCRIPTION SMIME_read_CMS() parses a message in S/MIME format. B 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 NULL. The parsed CMS_ContentInfo structure is returned or NULL if an error occurred. =head1 NOTES If B<*bcont> is not NULL then the message is clear text signed. B<*bcont> can then be passed to CMS_verify() with the B flag set. Otherwise the type of the returned structure can be determined using CMS_get0_type(). To support future functionality if B is not NULL B<*bcont> should be initialized to NULL. For example: BIO *cont = NULL; CMS_ContentInfo *cms; cms = SMIME_read_CMS(in, &cont); =head1 BUGS The MIME parser used by SMIME_read_CMS() is somewhat primitive. While it will handle most S/MIME messages more complex compound formats may not work. The parser assumes that the CMS_ContentInfo 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_CMS() returns a valid B structure or B if an error occurred. The error can be obtained from ERR_get_error(3). =head1 SEE ALSO L, L, L, L, L, L, L =head1 COPYRIGHT Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved. Licensed under the OpenSSL license (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at L. =cut