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.\" ========================================================================
.\"
.IX Title "SMIME_write_PKCS7 3"
.TH SMIME_write_PKCS7 3 "2019-12-20" "1.0.2u" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
SMIME_write_PKCS7 \- convert PKCS#7 structure to S/MIME format.
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/pkcs7.h>
\&
\& int SMIME_write_PKCS7(BIO *out, PKCS7 *p7, BIO *data, int flags);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBSMIME_write_PKCS7()\fR adds the appropriate \s-1MIME\s0 headers to a PKCS#7
structure to produce an S/MIME message.
.PP
\&\fBout\fR is the \s-1BIO\s0 to write the data to. \fBp7\fR is the appropriate \fB\s-1PKCS7\s0\fR
structure. If streaming is enabled then the content must be supplied in the
\&\fBdata\fR argument. \fBflags\fR is an optional set of flags.
.SH "NOTES"
.IX Header "NOTES"
The following flags can be passed in the \fBflags\fR parameter.
.PP
If \fB\s-1PKCS7_DETACHED\s0\fR is set then cleartext signing will be used,
this option only makes sense for signedData where \fB\s-1PKCS7_DETACHED\s0\fR
is also set when \fBPKCS7_sign()\fR is also called.
.PP
If the \fB\s-1PKCS7_TEXT\s0\fR flag is set \s-1MIME\s0 headers for type \fBtext/plain\fR
are added to the content, this only makes sense if \fB\s-1PKCS7_DETACHED\s0\fR
is also set.
.PP
If the \fB\s-1PKCS7_STREAM\s0\fR flag is set streaming is performed. This flag should
only be set if \fB\s-1PKCS7_STREAM\s0\fR was also set in the previous call to
\&\fBPKCS7_sign()\fR or \fB\fBPKCS7_encrypt()\fB\fR.
.PP
If cleartext signing is being used and \fB\s-1PKCS7_STREAM\s0\fR not set then
the data must be read twice: once to compute the signature in \fBPKCS7_sign()\fR
and once to output the S/MIME message.
.PP
If streaming is performed the content is output in \s-1BER\s0 format using indefinite
length constructuted encoding except in the case of signed data with detached
content where the content is absent and \s-1DER\s0 format is used.
.SH "BUGS"
.IX Header "BUGS"
\&\fBSMIME_write_PKCS7()\fR always base64 encodes PKCS#7 structures, there
should be an option to disable this.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBSMIME_write_PKCS7()\fR returns 1 for success or 0 for failure.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBERR_get_error\fR\|(3), \fBPKCS7_sign\fR\|(3),
\&\fBPKCS7_verify\fR\|(3), \fBPKCS7_encrypt\fR\|(3)
\&\fBPKCS7_decrypt\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
\&\fBSMIME_write_PKCS7()\fR was added to OpenSSL 0.9.5