=pod
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=head1 NAME
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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(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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=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() returns a valid B<CMS_ContentInfo> structure or B<NULL>
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if an error occurred. The error can be obtained from ERR_get_error(3).
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=head1 SEE ALSO
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L<ERR_get_error(3)|ERR_get_error(3)>, L<CMS_type(3)|CMS_type(3)>
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L<SMIME_read_CMS(3)|SMIME_read_CMS(3)>, L<CMS_sign(3)|CMS_sign(3)>,
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L<CMS_verify(3)|CMS_verify(3)>, L<CMS_encrypt(3)|CMS_encrypt(3)>
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L<CMS_decrypt(3)|CMS_decrypt(3)>
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=head1 HISTORY
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SMIME_read_CMS() was added to OpenSSL 0.9.8
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=cut
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