1SMIME_READ_PKCS7(3)                 OpenSSL                SMIME_READ_PKCS7(3)
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NAME

6       SMIME_read_PKCS7 - parse S/MIME message
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SYNOPSIS

9        #include <openssl/pkcs7.h>
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11        PKCS7 *SMIME_read_PKCS7(BIO *in, BIO **bcont);
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DESCRIPTION

14       SMIME_read_PKCS7() parses a message in S/MIME format.
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16       in is a BIO to read the message from.
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18       If cleartext signing is used then the content is saved in a memory bio
19       which is written to *bcont, otherwise *bcont is set to NULL.
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21       The parsed PKCS#7 structure is returned or NULL if an error occurred.
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NOTES

24       If *bcont is not NULL then the message is clear text signed. *bcont can
25       then be passed to PKCS7_verify() with the PKCS7_DETACHED flag set.
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27       Otherwise the type of the returned structure can be determined using
28       PKCS7_type_is_enveloped(), etc.
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30       To support future functionality if bcont is not NULL *bcont should be
31       initialized to NULL. For example:
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33        BIO *cont = NULL;
34        PKCS7 *p7;
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36        p7 = SMIME_read_PKCS7(in, &cont);
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BUGS

39       The MIME parser used by SMIME_read_PKCS7() is somewhat primitive.
40       While it will handle most S/MIME messages more complex compound formats
41       may not work.
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43       The parser assumes that the PKCS7 structure is always base64 encoded
44       and will not handle the case where it is in binary format or uses
45       quoted printable format.
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47       The use of a memory BIO to hold the signed content limits the size of
48       message which can be processed due to memory restraints: a streaming
49       single pass option should be available.
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RETURN VALUES

52       SMIME_read_PKCS7() returns a valid PKCS7 structure or NULL if an error
53       occurred. The error can be obtained from ERR_get_error(3).
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SEE ALSO

56       ERR_get_error(3), SMIME_read_PKCS7(3), PKCS7_sign(3), PKCS7_verify(3),
57       PKCS7_encrypt(3) PKCS7_decrypt(3)
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60       Copyright 2002-2018 The OpenSSL Project Authors. All Rights Reserved.
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62       Licensed under the OpenSSL license (the "License").  You may not use
63       this file except in compliance with the License.  You can obtain a copy
64       in the file LICENSE in the source distribution or at
65       <https://www.openssl.org/source/license.html>.
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691.1.1l                            2021-09-15               SMIME_READ_PKCS7(3)
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