5 SMIME_read_CMS - parse S/MIME message.
9 #include <openssl/cms.h>
11 CMS_ContentInfo *SMIME_read_CMS(BIO *in, BIO **bcont);
15 SMIME_read_CMS() parses a message in S/MIME format.
17 B<in> is a BIO to read the message from.
19 If cleartext signing is used then the content is saved in
20 a memory bio which is written to B<*bcont>, otherwise
21 B<*bcont> is set to B<NULL>.
23 The parsed CMS_ContentInfo structure is returned or B<NULL> if an
28 If B<*bcont> is not B<NULL> then the message is clear text
29 signed. B<*bcont> can then be passed to CMS_verify() with
30 the B<CMS_DETACHED> flag set.
32 Otherwise the type of the returned structure can be determined
33 using CMS_get0_type().
35 To support future functionality if B<bcont> is not B<NULL>
36 B<*bcont> should be initialized to B<NULL>. For example:
41 cms = SMIME_read_CMS(in, &cont);
45 The MIME parser used by SMIME_read_CMS() is somewhat primitive.
46 While it will handle most S/MIME messages more complex compound
49 The parser assumes that the CMS_ContentInfo structure is always base64
50 encoded and will not handle the case where it is in binary format
51 or uses quoted printable format.
53 The use of a memory BIO to hold the signed content limits the size
54 of message which can be processed due to memory restraints: a
55 streaming single pass option should be available.
59 SMIME_read_CMS() returns a valid B<CMS_ContentInfo> structure or B<NULL>
60 if an error occurred. The error can be obtained from ERR_get_error(3).
64 L<ERR_get_error(3)|ERR_get_error(3)>, L<CMS_type(3)|CMS_type(3)>
65 L<SMIME_read_CMS(3)|SMIME_read_CMS(3)>, L<CMS_sign(3)|CMS_sign(3)>,
66 L<CMS_verify(3)|CMS_verify(3)>, L<CMS_encrypt(3)|CMS_encrypt(3)>
67 L<CMS_decrypt(3)|CMS_decrypt(3)>
71 SMIME_read_CMS() was added to OpenSSL 0.9.8