1SMIME_READ_ASN1(3ossl)              OpenSSL             SMIME_READ_ASN1(3ossl)
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NAME

6       SMIME_read_ASN1_ex, SMIME_read_ASN1 - parse S/MIME message
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SYNOPSIS

9        #include <openssl/asn1.h>
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11        ASN1_VALUE *SMIME_read_ASN1_ex(BIO *in, int flags, BIO **bcont,
12                                       const ASN1_ITEM *it, ASN1_VALUE **x,
13                                       OSSL_LIB_CTX *libctx, const char *propq);
14        ASN1_VALUE *SMIME_read_ASN1(BIO *in, BIO **bcont, const ASN1_ITEM *it);
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DESCRIPTION

17       SMIME_read_ASN1_ex() parses a message in S/MIME format.
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19       in is a BIO to read the message from.  If the flags argument contains
20       CMS_BINARY then the input is assumed to be in binary format and is not
21       translated to canonical form.  If in addition SMIME_ASCIICRLF is set
22       then the binary input is assumed to be followed by CR and LF
23       characters, else only by an LF character.  x can be used to optionally
24       supply a previously created it ASN1_VALUE object (such as
25       CMS_ContentInfo or PKCS7), it can be set to NULL. Valid values that can
26       be used by ASN.1 structure it are ASN1_ITEM_rptr(PKCS7) or
27       ASN1_ITEM_rptr(CMS_ContentInfo). Any algorithm fetches that occur
28       during the operation will use the OSSL_LIB_CTX supplied in the libctx
29       parameter, and use the property query string propq See "ALGORITHM
30       FETCHING" in crypto(7) for further details about algorithm fetching.
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32       If cleartext signing is used then the content is saved in a memory bio
33       which is written to *bcont, otherwise *bcont is set to NULL.
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35       The parsed ASN1_VALUE structure is returned or NULL if an error
36       occurred.
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38       SMIME_read_ASN1() is similar to SMIME_read_ASN1_ex() but sets the value
39       of x to NULL and the value of flags to 0.
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NOTES

42       The higher level functions SMIME_read_CMS_ex(3) and
43       SMIME_read_PKCS7_ex(3) should be used instead of SMIME_read_ASN1_ex().
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45       To support future functionality if bcont is not NULL *bcont should be
46       initialized to NULL.
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BUGS

49       The MIME parser used by SMIME_read_ASN1_ex() is somewhat primitive.
50       While it will handle most S/MIME messages more complex compound formats
51       may not work.
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53       The use of a memory BIO to hold the signed content limits the size of
54       message which can be processed due to memory restraints: a streaming
55       single pass option should be available.
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RETURN VALUES

58       SMIME_read_ASN1_ex() and SMIME_read_ASN1() return a valid ASN1_VALUE
59       structure or NULL if an error occurred. The error can be obtained from
60       ERR_get_error(3).
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SEE ALSO

63       ERR_get_error(3), SMIME_read_CMS_ex(3), SMIME_read_PKCS7_ex(3),
64       SMIME_write_ASN1(3), SMIME_write_ASN1_ex(3)
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HISTORY

67       The function SMIME_read_ASN1_ex() was added in OpenSSL 3.0.
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70       Copyright 2020-2021 The OpenSSL Project Authors. All Rights Reserved.
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72       Licensed under the Apache License 2.0 (the "License").  You may not use
73       this file except in compliance with the License.  You can obtain a copy
74       in the file LICENSE in the source distribution or at
75       <https://www.openssl.org/source/license.html>.
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793.0.5                             2022-07-05            SMIME_READ_ASN1(3ossl)
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