SMIME_read_PKCS7 - parse S/MIME message.
#include <openssl/pkcs7.h> PKCS7 *SMIME_read_PKCS7(BIO *in, BIO **bcont);
OpenSSL SMIME_read_PKCS7(3openssl)
NAME
SMIME_read_PKCS7 - parse S/MIME message.
SYNOPSIS
#include <openssl/pkcs7.h>
PKCS7 *SMIME_read_PKCS7(BIO *in, BIO **bcont);
DESCRIPTION
SMIME_read_PKCS7() 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 PKCS#7 structure is returned or NULL if an error occurred.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
+---------------+--------------------------+
|ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+---------------+--------------------------+
|Availability | library/security/openssl |
+---------------+--------------------------+
|Stability | Pass-through uncommitted |
+---------------+--------------------------+
NOTES
If *bcont is not NULL then the message is clear text signed. *bcont can
then be passed to PKCS7_verify() with the PKCS7_DETACHED flag set.
Otherwise the type of the returned structure can be determined using
PKCS7_type().
To support future functionality if bcont is not NULL *bcont should be
initialized to NULL. For example:
BIO *cont = NULL;
PKCS7 *p7;
p7 = SMIME_read_PKCS7(in, &cont);
Source code for open source software components in Oracle Solaris can
be found at https://www.oracle.com/downloads/opensource/solaris-source-
code-downloads.html.
This software was built from source available at
https://github.com/oracle/solaris-userland. The original community
source was downloaded from
https://www.openssl.org/source/openssl-1.0.2ze.tar.gz.
Further information about this software can be found on the open source
community website at https://www.openssl.org/.
BUGS
The MIME parser used by SMIME_read_PKCS7() is somewhat primitive.
While it will handle most S/MIME messages more complex compound formats
may not work.
The parser assumes that the PKCS7 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_PKCS7() returns a valid PKCS7 structure or NULL if an error
occurred. The error can be obtained from ERR_get_error(3).
SEE ALSO
ERR_get_error(3), PKCS7_type(3) SMIME_read_PKCS7(3), PKCS7_sign(3),
PKCS7_verify(3), PKCS7_encrypt(3) PKCS7_decrypt(3)
HISTORY
SMIME_read_PKCS7() was added to OpenSSL 0.9.5
1.0.2ze 2022-05-03
SMIME_read_PKCS7(3openssl)