SMIME_READ_CMS - Online Linux Manual Page

Section : 3
Updated : 2021-03-26
Source : 1.1.1k
Note : OpenSSL
NAMESMIME_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.
NOTESIf *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);
BUGSThe 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)
COPYRIGHTCopyright 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>. 0
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