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SMIME_WRITE_PKCS7(3) | Library Functions Manual | SMIME_WRITE_PKCS7(3) |
NAME
SMIME_write_PKCS7
—
convert PKCS#7 structure to S/MIME format
SYNOPSIS
#include
<openssl/pkcs7.h>
int
SMIME_write_PKCS7
(BIO
*out, PKCS7 *p7,
BIO *data, int
flags);
DESCRIPTION
SMIME_write_PKCS7
() adds the appropriate MIME
headers to a PKCS#7 structure to produce an S/MIME message.
out is the BIO
to write the data to. p7 is the appropriate
PKCS7 structure. If streaming is enabled,
then the content must be supplied in the data
argument. flags is an optional set of flags.
The following flags can be passed in the flags
parameter.
If PKCS7_DETACHED
is set, then cleartext
signing will be used. This option only makes sense for signedData where
PKCS7_DETACHED
is also set when
PKCS7_sign(3) is
also called.
If the PKCS7_TEXT
flag is set, MIME headers
for type text/plain are added to the content.
This only makes sense if PKCS7_DETACHED
is
also set.
If the PKCS7_STREAM
flag is set, streaming is
performed. This flag should only be set if
PKCS7_STREAM
was also set in the previous
call to
PKCS7_sign(3) or
PKCS7_encrypt(3).
The bit SMIME_OLDMIME
is inverted before
passing on the flags to
SMIME_write_ASN1(3).
Consequently, if this bit is set in the flags
argument, “application/pkcs7-mime” or
“application/pkcs7-signature” is used in Content-Type headers.
Otherwise, “application/x-pkcs7-mime” or
“application/x-pkcs7-signature” is used.
If cleartext signing is being used and
PKCS7_STREAM
is not set, then the data must
be read twice: once to compute the signature in
PKCS7_sign(3)
and once to output the S/MIME message.
If streaming is performed, the content is output in BER format using indefinite
length constructed encoding except in the case of signed data with detached
content where the content is absent and DER format is used.
RETURN VALUES
Upon successful completion, 1 is returned; otherwise 0 is returned and an error code can be retrieved with ERR_get_error(3).SEE ALSO
i2d_PKCS7_bio_stream(3), PEM_write_bio_PKCS7_stream(3), PEM_write_PKCS7(3), PKCS7_final(3), PKCS7_new(3), SMIME_read_PKCS7(3), SMIME_write_ASN1(3)HISTORY
SMIME_write_PKCS7
() first appeared in OpenSSL
0.9.5 and has been available since OpenBSD 2.7.
BUGS
SMIME_write_PKCS7
() always base64 encodes
PKCS#7 structures. There should be an option to disable this.December 14, 2021 | Debian |