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| SMIME_READ_PKCS7(3) | Library Functions Manual | SMIME_READ_PKCS7(3) |
NAME
SMIME_read_PKCS7 —
extract a PKCS#7 object from an S/MIME message
SYNOPSIS
#include
<openssl/pkcs7.h>
PKCS7 *
SMIME_read_PKCS7(BIO
*in, BIO **bcont);
DESCRIPTION
SMIME_read_PKCS7() parses a message in S/MIME
format.
in is a BIO to
read the message from.
If cleartext signing is used, then the content is saved in a memory
BIO which is written to
*bcont, otherwise
*bcont is set to
NULL.
The parsed PKCS#7 structure is returned, or
NULL if an error occurred.
If *bcont is not
NULL, then the message is clear text
signed. *bcont can then be passed to
PKCS7_verify(3)
with the PKCS7_DETACHED flag set.
Otherwise the type of the returned structure can be determined using the
PKCS7_type_is_*() macros defined in
<openssl/pkcs7.h>.
To support future functionality, if bcont is
not NULL,
*bcont should be initialized to
NULL. For example:
BIO *cont = NULL; PKCS7 *p7; p7 = SMIME_read_PKCS7(in, &cont);
RETURN VALUES
SMIME_read_PKCS7() returns a valid
PKCS7 structure or
NULL if an error occurred. The error can be
obtained from
ERR_get_error(3).
SEE ALSO
PKCS7_new(3), SMIME_read_ASN1(3), SMIME_write_PKCS7(3)HISTORY
SMIME_read_PKCS7() first appeared in OpenSSL
0.9.5 and has been available since OpenBSD 2.7.
BUGS
The MIME parser used bySMIME_read_PKCS7() is
somewhat primitive. While it will handle most S/MIME messages, more complex
compound formats may not work.
The parser assumes that the PKCS7 structure is
always base64 encoded, and it will not handle the case where it is in binary
format or uses quoted printable format.
The use of a memory BIO to hold the signed
content limits the size of the message which can be processed due to memory
restraints: a streaming single pass option should be available.| December 14, 2021 | Debian |