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>
69 lines
1.7 KiB
Text
69 lines
1.7 KiB
Text
=pod
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=head1 NAME
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SMIME_read_PKCS7 - parse S/MIME message.
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=head1 SYNOPSIS
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#include <openssl/pkcs7.h>
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PKCS7 *SMIME_read_PKCS7(BIO *in, BIO **bcont);
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=head1 DESCRIPTION
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SMIME_read_PKCS7() 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
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a memory bio which is written to B<*bcont>, otherwise
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B<*bcont> is set to B<NULL>.
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The parsed PKCS#7 structure is returned or B<NULL> if an
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error occurred.
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=head1 NOTES
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If B<*bcont> is not B<NULL> then the message is clear text
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signed. B<*bcont> can then be passed to PKCS7_verify() with
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the B<PKCS7_DETACHED> flag set.
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Otherwise the type of the returned structure can be determined
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using PKCS7_type().
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To support future functionality if B<bcont> is not B<NULL>
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B<*bcont> should be initialized to B<NULL>. For example:
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BIO *cont = NULL;
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PKCS7 *p7;
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p7 = SMIME_read_PKCS7(in, &cont);
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=head1 BUGS
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The MIME parser used by SMIME_read_PKCS7() is somewhat primitive.
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While it will handle most S/MIME messages more complex compound
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formats may not work.
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The parser assumes that the PKCS7 structure is always base64
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encoded and will not handle the case where it is in binary format
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or uses quoted printable format.
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The use of a memory BIO to hold the signed content limits the size
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of message which can be processed due to memory restraints: a
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streaming single pass option should be available.
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=head1 RETURN VALUES
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SMIME_read_PKCS7() returns a valid B<PKCS7> structure or B<NULL>
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is 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<PKCS7_type(3)>
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L<SMIME_read_PKCS7(3)>, L<PKCS7_sign(3)>,
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L<PKCS7_verify(3)>, L<PKCS7_encrypt(3)>
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L<PKCS7_decrypt(3)>
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=cut
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