a528d4f0a9
If something was "present in all versions" of SSLeay, or if it was added to a version of SSLeay (and therefore predates OpenSSL), remove mention of it. Documentation history now starts with OpenSSL. Remove mention of all history before OpenSSL 0.9.8, inclusive. Remove all AUTHOR sections. Reviewed-by: Tim Hudson <tjh@openssl.org>
66 lines
1.7 KiB
Text
66 lines
1.7 KiB
Text
=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)>, L<CMS_type(3)>
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L<SMIME_read_CMS(3)>, L<CMS_sign(3)>,
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L<CMS_verify(3)>, L<CMS_encrypt(3)>
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L<CMS_decrypt(3)>
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=cut
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