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)
HISTORY¶
SMIME_read_CMS() was added to OpenSSL 0.9.8