220 lines
7.7 KiB
Groff
220 lines
7.7 KiB
Groff
.\" Automatically generated by Pod::Man 2.25 (Pod::Simple 3.28)
|
|
.\"
|
|
.\" Standard preamble:
|
|
.\" ========================================================================
|
|
.de Sp \" Vertical space (when we can't use .PP)
|
|
.if t .sp .5v
|
|
.if n .sp
|
|
..
|
|
.de Vb \" Begin verbatim text
|
|
.ft CW
|
|
.nf
|
|
.ne \\$1
|
|
..
|
|
.de Ve \" End verbatim text
|
|
.ft R
|
|
.fi
|
|
..
|
|
.\" Set up some character translations and predefined strings. \*(-- will
|
|
.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left
|
|
.\" double quote, and \*(R" will give a right double quote. \*(C+ will
|
|
.\" give a nicer C++. Capital omega is used to do unbreakable dashes and
|
|
.\" therefore won't be available. \*(C` and \*(C' expand to `' in nroff,
|
|
.\" nothing in troff, for use with C<>.
|
|
.tr \(*W-
|
|
.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
|
|
.ie n \{\
|
|
. ds -- \(*W-
|
|
. ds PI pi
|
|
. if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
|
|
. if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch
|
|
. ds L" ""
|
|
. ds R" ""
|
|
. ds C` ""
|
|
. ds C' ""
|
|
'br\}
|
|
.el\{\
|
|
. ds -- \|\(em\|
|
|
. ds PI \(*p
|
|
. ds L" ``
|
|
. ds R" ''
|
|
'br\}
|
|
.\"
|
|
.\" Escape single quotes in literal strings from groff's Unicode transform.
|
|
.ie \n(.g .ds Aq \(aq
|
|
.el .ds Aq '
|
|
.\"
|
|
.\" If the F register is turned on, we'll generate index entries on stderr for
|
|
.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
|
|
.\" entries marked with X<> in POD. Of course, you'll have to process the
|
|
.\" output yourself in some meaningful fashion.
|
|
.ie \nF \{\
|
|
. de IX
|
|
. tm Index:\\$1\t\\n%\t"\\$2"
|
|
..
|
|
. nr % 0
|
|
. rr F
|
|
.\}
|
|
.el \{\
|
|
. de IX
|
|
..
|
|
.\}
|
|
.\"
|
|
.\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
|
|
.\" Fear. Run. Save yourself. No user-serviceable parts.
|
|
. \" fudge factors for nroff and troff
|
|
.if n \{\
|
|
. ds #H 0
|
|
. ds #V .8m
|
|
. ds #F .3m
|
|
. ds #[ \f1
|
|
. ds #] \fP
|
|
.\}
|
|
.if t \{\
|
|
. ds #H ((1u-(\\\\n(.fu%2u))*.13m)
|
|
. ds #V .6m
|
|
. ds #F 0
|
|
. ds #[ \&
|
|
. ds #] \&
|
|
.\}
|
|
. \" simple accents for nroff and troff
|
|
.if n \{\
|
|
. ds ' \&
|
|
. ds ` \&
|
|
. ds ^ \&
|
|
. ds , \&
|
|
. ds ~ ~
|
|
. ds /
|
|
.\}
|
|
.if t \{\
|
|
. ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u"
|
|
. ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u'
|
|
. ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u'
|
|
. ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u'
|
|
. ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u'
|
|
. ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u'
|
|
.\}
|
|
. \" troff and (daisy-wheel) nroff accents
|
|
.ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V'
|
|
.ds 8 \h'\*(#H'\(*b\h'-\*(#H'
|
|
.ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#]
|
|
.ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H'
|
|
.ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u'
|
|
.ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#]
|
|
.ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#]
|
|
.ds ae a\h'-(\w'a'u*4/10)'e
|
|
.ds Ae A\h'-(\w'A'u*4/10)'E
|
|
. \" corrections for vroff
|
|
.if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
|
|
.if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u'
|
|
. \" for low resolution devices (crt and lpr)
|
|
.if \n(.H>23 .if \n(.V>19 \
|
|
\{\
|
|
. ds : e
|
|
. ds 8 ss
|
|
. ds o a
|
|
. ds d- d\h'-1'\(ga
|
|
. ds D- D\h'-1'\(hy
|
|
. ds th \o'bp'
|
|
. ds Th \o'LP'
|
|
. ds ae ae
|
|
. ds Ae AE
|
|
.\}
|
|
.rm #[ #] #H #V #F C
|
|
.\" ========================================================================
|
|
.\"
|
|
.IX Title "CMS_encrypt 3"
|
|
.TH CMS_encrypt 3 "2014-08-06" "1.0.1i" "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"
|
|
.Vb 1
|
|
\& CMS_encrypt \- create a CMS envelopedData structure
|
|
.Ve
|
|
.SH "SYNOPSIS"
|
|
.IX Header "SYNOPSIS"
|
|
.Vb 1
|
|
\& #include <openssl/cms.h>
|
|
\&
|
|
\& CMS_ContentInfo *CMS_encrypt(STACK_OF(X509) *certs, BIO *in, const EVP_CIPHER *cipher, unsigned int flags);
|
|
.Ve
|
|
.SH "DESCRIPTION"
|
|
.IX Header "DESCRIPTION"
|
|
\&\fICMS_encrypt()\fR creates and returns a \s-1CMS\s0 EnvelopedData structure. \fBcerts\fR
|
|
is a list of recipient certificates. \fBin\fR is the content to be encrypted.
|
|
\&\fBcipher\fR is the symmetric cipher to use. \fBflags\fR is an optional set of flags.
|
|
.SH "NOTES"
|
|
.IX Header "NOTES"
|
|
Only certificates carrying \s-1RSA\s0 keys are supported so the recipient certificates
|
|
supplied to this function must all contain \s-1RSA\s0 public keys, though they do not
|
|
have to be signed using the \s-1RSA\s0 algorithm.
|
|
.PP
|
|
\&\fIEVP_des_ede3_cbc()\fR (triple \s-1DES\s0) is the algorithm of choice for S/MIME use
|
|
because most clients will support it.
|
|
.PP
|
|
The algorithm passed in the \fBcipher\fR parameter must support \s-1ASN1\s0 encoding of
|
|
its parameters.
|
|
.PP
|
|
Many browsers implement a \*(L"sign and encrypt\*(R" option which is simply an S/MIME
|
|
envelopedData containing an S/MIME signed message. This can be readily produced
|
|
by storing the S/MIME signed message in a memory \s-1BIO\s0 and passing it to
|
|
\&\fICMS_encrypt()\fR.
|
|
.PP
|
|
The following flags can be passed in the \fBflags\fR parameter.
|
|
.PP
|
|
If the \fB\s-1CMS_TEXT\s0\fR flag is set \s-1MIME\s0 headers for type \fBtext/plain\fR are
|
|
prepended to the data.
|
|
.PP
|
|
Normally the supplied content is translated into \s-1MIME\s0 canonical format (as
|
|
required by the S/MIME specifications) if \fB\s-1CMS_BINARY\s0\fR is set no translation
|
|
occurs. This option should be used if the supplied data is in binary format
|
|
otherwise the translation will corrupt it. If \fB\s-1CMS_BINARY\s0\fR is set then
|
|
\&\fB\s-1CMS_TEXT\s0\fR is ignored.
|
|
.PP
|
|
OpenSSL will by default identify recipient certificates using issuer name
|
|
and serial number. If \fB\s-1CMS_USE_KEYID\s0\fR is set it will use the subject key
|
|
identifier value instead. An error occurs if all recipient certificates do not
|
|
have a subject key identifier extension.
|
|
.PP
|
|
If the \fB\s-1CMS_STREAM\s0\fR flag is set a partial \fBCMS_ContentInfo\fR structure is
|
|
returned suitable for streaming I/O: no data is read from the \s-1BIO\s0 \fBin\fR.
|
|
.PP
|
|
If the \fB\s-1CMS_PARTIAL\s0\fR flag is set a partial \fBCMS_ContentInfo\fR structure is
|
|
returned to which additional recipients and attributes can be added before
|
|
finalization.
|
|
.PP
|
|
The data being encrypted is included in the CMS_ContentInfo structure, unless
|
|
\&\fB\s-1CMS_DETACHED\s0\fR is set in which case it is omitted. This is rarely used in
|
|
practice and is not supported by \fISMIME_write_CMS()\fR.
|
|
.SH "NOTES"
|
|
.IX Header "NOTES"
|
|
If the flag \fB\s-1CMS_STREAM\s0\fR is set the returned \fBCMS_ContentInfo\fR structure is
|
|
\&\fBnot\fR complete and outputting its contents via a function that does not
|
|
properly finalize the \fBCMS_ContentInfo\fR structure will give unpredictable
|
|
results.
|
|
.PP
|
|
Several functions including \fISMIME_write_CMS()\fR, \fIi2d_CMS_bio_stream()\fR,
|
|
\&\fIPEM_write_bio_CMS_stream()\fR finalize the structure. Alternatively finalization
|
|
can be performed by obtaining the streaming \s-1ASN1\s0 \fB\s-1BIO\s0\fR directly using
|
|
\&\fIBIO_new_CMS()\fR.
|
|
.PP
|
|
The recipients specified in \fBcerts\fR use a \s-1CMS\s0 KeyTransRecipientInfo info
|
|
structure. KEKRecipientInfo is also supported using the flag \fB\s-1CMS_PARTIAL\s0\fR
|
|
and \fICMS_add0_recipient_key()\fR.
|
|
.PP
|
|
The parameter \fBcerts\fR may be \s-1NULL\s0 if \fB\s-1CMS_PARTIAL\s0\fR is set and recipients
|
|
added later using \fICMS_add1_recipient_cert()\fR or \fICMS_add0_recipient_key()\fR.
|
|
.SH "RETURN VALUES"
|
|
.IX Header "RETURN VALUES"
|
|
\&\fICMS_encrypt()\fR returns either a CMS_ContentInfo structure or \s-1NULL\s0 if an error
|
|
occurred. The error can be obtained from \fIERR_get_error\fR\|(3).
|
|
.SH "SEE ALSO"
|
|
.IX Header "SEE ALSO"
|
|
\&\fIERR_get_error\fR\|(3), \fICMS_decrypt\fR\|(3)
|
|
.SH "HISTORY"
|
|
.IX Header "HISTORY"
|
|
\&\fICMS_decrypt()\fR was added to OpenSSL 0.9.8
|
|
The \fB\s-1CMS_STREAM\s0\fR flag was first supported in OpenSSL 1.0.0.
|