mirror of https://github.com/openssl/openssl.git
89 lines
2.5 KiB
Plaintext
89 lines
2.5 KiB
Plaintext
=pod
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=head1 NAME
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SMIME_read_CMS_ex, SMIME_read_CMS - parse S/MIME message
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=head1 SYNOPSIS
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#include <openssl/cms.h>
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CMS_ContentInfo *SMIME_read_CMS_ex(BIO *bio, BIO **bcont,
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CMS_ContentInfo **cms);
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CMS_ContentInfo *SMIME_read_CMS(BIO *in, BIO **bcont);
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=head1 DESCRIPTION
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SMIME_read_CMS() parses a message in S/MIME format.
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B<in> is a BIO to read the message from.
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If cleartext signing is used then the content is saved in a memory bio which is
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written to B<*bcont>, otherwise B<*bcont> is set to NULL.
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The parsed CMS_ContentInfo structure is returned or NULL if an
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error occurred.
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SMIME_read_CMS_ex() is similar to SMIME_read_CMS() but can optionally supply a
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previously created I<cms> CMS_ContentInfo object. If I<cms> is NULL then it is
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identical to SMIME_read_CMS().
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To create a I<cms> object use L<CMS_ContentInfo_new_ex(3)>.
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=head1 NOTES
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If B<*bcont> is not NULL then the message is clear text signed. B<*bcont> can
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then be passed to CMS_verify() with the B<CMS_DETACHED> flag set.
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Otherwise the type of the returned structure can be determined
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using CMS_get0_type().
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To support future functionality if B<bcont> is not NULL B<*bcont> should be
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initialized to NULL. For example:
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BIO *cont = NULL;
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CMS_ContentInfo *cms;
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cms = SMIME_read_CMS(in, &cont);
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=head1 BUGS
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The MIME parser used by SMIME_read_CMS() is somewhat primitive. While it will
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handle most S/MIME messages more complex compound formats may not work.
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The parser assumes that the CMS_ContentInfo structure is always base64 encoded
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and will not handle the case where it is in binary format or uses quoted
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printable format.
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The use of a memory BIO to hold the signed content limits the size of message
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which can be processed due to memory restraints: a streaming single pass option
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should be available.
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=head1 RETURN VALUES
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SMIME_read_CMS_ex() and SMIME_read_CMS() return a valid B<CMS_ContentInfo>
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structure or B<NULL> if an error occurred. The error can be obtained from
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ERR_get_error(3).
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=head1 SEE ALSO
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L<ERR_get_error(3)>,
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L<CMS_sign(3)>,
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L<CMS_verify(3)>,
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L<CMS_encrypt(3)>,
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L<CMS_decrypt(3)>
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=head1 HISTORY
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The function SMIME_read_CMS_ex() was added in OpenSSL 3.0.
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=head1 COPYRIGHT
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Copyright 2008-2020 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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