NetBSD/lib/libcrypto/man/OBJ_nid2obj.3

297 lines
9.3 KiB
Groff

.\" $NetBSD: OBJ_nid2obj.3,v 1.1 2003/07/24 14:16:41 itojun Exp $
.\"
.\" Automatically generated by Pod::Man version 1.02
.\" Thu Jul 24 13:07:58 2003
.\"
.\" Standard preamble:
.\" ======================================================================
.de Sh \" Subsection heading
.br
.if t .Sp
.ne 5
.PP
\fB\\$1\fR
.PP
..
.de Sp \" Vertical space (when we can't use .PP)
.if t .sp .5v
.if n .sp
..
.de Ip \" List item
.br
.ie \\n(.$>=3 .ne \\$3
.el .ne 3
.IP "\\$1" \\$2
..
.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. | will give a
.\" real vertical bar. \*(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-|\(bv\*(Tr
.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\}
.\"
.\" If the F register is turned on, we'll generate index entries on stderr
.\" for titles (.TH), headers (.SH), subsections (.Sh), items (.Ip), and
.\" index entries marked with X<> in POD. Of course, you'll have to process
.\" the output yourself in some meaningful fashion.
.if \nF \{\
. de IX
. tm Index:\\$1\t\\n%\t"\\$2"
. .
. nr % 0
. rr F
.\}
.\"
.\" For nroff, turn off justification. Always turn off hyphenation; it
.\" makes way too many mistakes in technical documents.
.hy 0
.if n .na
.\"
.\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
.\" Fear. Run. Save yourself. No user-serviceable parts.
.bd B 3
. \" 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 "OBJ_nid2obj 3"
.TH OBJ_nid2obj 3 "0.9.7b" "2002-10-20" "OpenSSL"
.UC
.SH "NAME"
OBJ_nid2obj, OBJ_nid2ln, OBJ_nid2sn, OBJ_obj2nid, OBJ_txt2nid, OBJ_ln2nid, OBJ_sn2nid,
OBJ_cmp, OBJ_dup, OBJ_txt2obj, OBJ_obj2txt, OBJ_create, OBJ_cleanup \- \s-1ASN1\s0 object utility
functions
.SH "LIBRARY"
libcrypto, -lcrypto
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 3
\& ASN1_OBJECT * OBJ_nid2obj(int n);
\& const char * OBJ_nid2ln(int n);
\& const char * OBJ_nid2sn(int n);
.Ve
.Vb 3
\& int OBJ_obj2nid(const ASN1_OBJECT *o);
\& int OBJ_ln2nid(const char *ln);
\& int OBJ_sn2nid(const char *sn);
.Ve
.Vb 1
\& int OBJ_txt2nid(const char *s);
.Ve
.Vb 2
\& ASN1_OBJECT * OBJ_txt2obj(const char *s, int no_name);
\& int OBJ_obj2txt(char *buf, int buf_len, const ASN1_OBJECT *a, int no_name);
.Ve
.Vb 2
\& int OBJ_cmp(const ASN1_OBJECT *a,const ASN1_OBJECT *b);
\& ASN1_OBJECT * OBJ_dup(const ASN1_OBJECT *o);
.Ve
.Vb 2
\& int OBJ_create(const char *oid,const char *sn,const char *ln);
\& void OBJ_cleanup(void);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \s-1ASN1\s0 object utility functions process \s-1ASN1_OBJECT\s0 structures which are
a representation of the \s-1ASN1\s0 \s-1OBJECT\s0 \s-1IDENTIFIER\s0 (\s-1OID\s0) type.
.PP
\&\fIOBJ_nid2obj()\fR, \fIOBJ_nid2ln()\fR and \fIOBJ_nid2sn()\fR convert the \s-1NID\s0 \fBn\fR to
an \s-1ASN1_OBJECT\s0 structure, its long name and its short name respectively,
or \fB\s-1NULL\s0\fR is an error occurred.
.PP
\&\fIOBJ_obj2nid()\fR, \fIOBJ_ln2nid()\fR, \fIOBJ_sn2nid()\fR return the corresponding \s-1NID\s0
for the object \fBo\fR, the long name <ln> or the short name <sn> respectively
or NID_undef if an error occurred.
.PP
\&\fIOBJ_txt2nid()\fR returns \s-1NID\s0 corresponding to text string <s>. \fBs\fR can be
a long name, a short name or the numerical respresentation of an object.
.PP
\&\fIOBJ_txt2obj()\fR converts the text string \fBs\fR into an \s-1ASN1_OBJECT\s0 structure.
If \fBno_name\fR is 0 then long names and short names will be interpreted
as well as numerical forms. If \fBno_name\fR is 1 only the numerical form
is acceptable.
.PP
\&\fIOBJ_obj2txt()\fR converts the \fB\s-1ASN1_OBJECT\s0\fR \fBa\fR into a textual representation.
The representation is written as a null terminated string to \fBbuf\fR
at most \fBbuf_len\fR bytes are written, truncating the result if necessary.
The total amount of space required is returned. If \fBno_name\fR is 0 then
if the object has a long or short name then that will be used, otherwise
the numerical form will be used. If \fBno_name\fR is 1 then the numerical
form will always be used.
.PP
\&\fIOBJ_cmp()\fR compares \fBa\fR to \fBb\fR. If the two are identical 0 is returned.
.PP
\&\fIOBJ_dup()\fR returns a copy of \fBo\fR.
.PP
\&\fIOBJ_create()\fR adds a new object to the internal table. \fBoid\fR is the
numerical form of the object, \fBsn\fR the short name and \fBln\fR the
long name. A new \s-1NID\s0 is returned for the created object.
.PP
\&\fIOBJ_cleanup()\fR cleans up OpenSSLs internal object table: this should
be called before an application exits if any new objects were added
using \fIOBJ_create()\fR.
.SH "NOTES"
.IX Header "NOTES"
Objects in OpenSSL can have a short name, a long name and a numerical
identifier (\s-1NID\s0) associated with them. A standard set of objects is
represented in an internal table. The appropriate values are defined
in the header file \fBobjects.h\fR.
.PP
For example the \s-1OID\s0 for commonName has the following definitions:
.PP
.Vb 3
\& #define SN_commonName "CN"
\& #define LN_commonName "commonName"
\& #define NID_commonName 13
.Ve
New objects can be added by calling \fIOBJ_create()\fR.
.PP
Table objects have certain advantages over other objects: for example
their NIDs can be used in a C language switch statement. They are
also static constant structures which are shared: that is there
is only a single constant structure for each table object.
.PP
Objects which are not in the table have the \s-1NID\s0 value NID_undef.
.PP
Objects do not need to be in the internal tables to be processed,
the functions \fIOBJ_txt2obj()\fR and \fIOBJ_obj2txt()\fR can process the numerical
form of an \s-1OID\s0.
.SH "EXAMPLES"
.IX Header "EXAMPLES"
Create an object for \fBcommonName\fR:
.PP
.Vb 2
\& ASN1_OBJECT *o;
\& o = OBJ_nid2obj(NID_commonName);
.Ve
Check if an object is \fBcommonName\fR
.PP
.Vb 2
\& if (OBJ_obj2nid(obj) == NID_commonName)
\& /* Do something */
.Ve
Create a new \s-1NID\s0 and initialize an object from it:
.PP
.Vb 3
\& int new_nid;
\& ASN1_OBJECT *obj;
\& new_nid = OBJ_create("1.2.3.4", "NewOID", "New Object Identifier");
.Ve
.Vb 1
\& obj = OBJ_nid2obj(new_nid);
.Ve
Create a new object directly:
.PP
.Vb 1
\& obj = OBJ_txt2obj("1.2.3.4", 1);
.Ve
.SH "BUGS"
.IX Header "BUGS"
\&\fIOBJ_obj2txt()\fR is awkward and messy to use: it doesn't follow the
convention of other OpenSSL functions where the buffer can be set
to \fB\s-1NULL\s0\fR to determine the amount of data that should be written.
Instead \fBbuf\fR must point to a valid buffer and \fBbuf_len\fR should
be set to a positive value. A buffer length of 80 should be more
than enough to handle any \s-1OID\s0 encountered in practice.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fIOBJ_nid2obj()\fR returns an \fB\s-1ASN1_OBJECT\s0\fR structure or \fB\s-1NULL\s0\fR is an
error occurred.
.PP
\&\fIOBJ_nid2ln()\fR and \fIOBJ_nid2sn()\fR returns a valid string or \fB\s-1NULL\s0\fR
on error.
.PP
\&\fIOBJ_obj2nid()\fR, \fIOBJ_ln2nid()\fR, \fIOBJ_sn2nid()\fR and \fIOBJ_txt2nid()\fR return
a \s-1NID\s0 or \fBNID_undef\fR on error.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
ERR_get_error(3)
.SH "HISTORY"
.IX Header "HISTORY"
\&\s-1TBA\s0