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• NAME
• SYNOPSIS
• DESCRIPTION
• NOTES
• BUGS
• RETURN VALUES
• SEE ALSO
• COPYRIGHT

NAME

SMIME_read_CMS - parse S/MIME message

SYNOPSIS

 #include <openssl/cms.h>

 CMS_ContentInfo *SMIME_read_CMS(BIO *in, BIO **bcont);

DESCRIPTION

SMIME_read_CMS() parses a message in S/MIME format.

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 *bcont, otherwise *bcont is set to NULL.

The parsed CMS_ContentInfo structure is returned or NULL if an error occurred.

NOTES

If *bcont is not NULL then the message is clear text signed. *bcont can then be passed to CMS_verify() with the CMS_DETACHED flag set.

Otherwise the type of the returned structure can be determined using CMS_get0_type().

To support future functionality if bcont is not NULL *bcont should be initialized to NULL. For example:

 BIO *cont = NULL;
 CMS_ContentInfo *cms;

 cms = SMIME_read_CMS(in, &cont);

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.

RETURN VALUES

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

SEE ALSO

ERR_get_error(3), CMS_type(3), SMIME_read_CMS(3), CMS_sign(3), CMS_verify(3), CMS_encrypt(3), CMS_decrypt(3)

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 https://www.openssl.org/source/license.html.