mirror of https://github.com/openssl/openssl.git
78 lines
2.3 KiB
Plaintext
78 lines
2.3 KiB
Plaintext
=pod
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=head1 NAME
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SMIME_read_ASN1_ex, SMIME_read_ASN1
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- parse S/MIME message
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=head1 SYNOPSIS
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#include <openssl/asn1.h>
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ASN1_VALUE *SMIME_read_ASN1_ex(BIO *in, BIO **bcont, const ASN1_ITEM *it,
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ASN1_VALUE **x);
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ASN1_VALUE *SMIME_read_ASN1(BIO *in, BIO **bcont, const ASN1_ITEM *it);
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=head1 DESCRIPTION
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SMIME_read_ASN1_ex() parses a message in S/MIME format.
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I<in> is a BIO to read the message from. I<x> can be used to optionally supply
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a previously created I<it> ASN1_VALUE object (such as CMS_ContentInfo or PKCS7),
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it can be set to NULL. Valid values that can be used by ASN.1 structure I<it>
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are ASN1_ITEM_rptr(PKCS7) or ASN1_ITEM_rptr(CMS_ContentInfo).
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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 I<*bcont>, otherwise I<*bcont> is set to NULL.
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The parsed ASN1_VALUE structure is returned or NULL if an error occurred.
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SMIME_read_ASN1() is similar to SMIME_read_ASN1_ex() but sets the value of I<x>
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to NULL.
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=head1 NOTES
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The higher level functions L<SMIME_read_CMS_ex(3)> and
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L<SMIME_read_PKCS7_ex(3)> should be used instead of SMIME_read_ASN1_ex().
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To support future functionality if I<bcont> is not NULL I<*bcont> should be
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initialized to NULL.
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=head1 BUGS
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The MIME parser used by SMIME_read_ASN1_ex() 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 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_ASN1_ex() and SMIME_read_ASN1() return a valid B<ASN1_VALUE>
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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<SMIME_read_CMS_ex(3)>,
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L<SMIME_read_PKCS7_ex(3)>,
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L<SMIME_write_ASN1(3)>,
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L<SMIME_write_ASN1_ex(3)>
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=head1 HISTORY
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The function SMIME_read_ASN1_ex() was added in OpenSSL 3.0.
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=head1 COPYRIGHT
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Copyright 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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