1 .\" Automatically generated by Pod::Man version 1.15
2 .\" Wed Feb 19 16:42:55 2003
5 .\" ======================================================================
6 .de Sh \" Subsection heading
14 .de Sp \" Vertical space (when we can't use .PP)
20 .ie \\n(.$>=3 .ne \\$3
24 .de Vb \" Begin verbatim text
29 .de Ve \" End verbatim text
34 .\" Set up some character translations and predefined strings. \*(-- will
35 .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left
36 .\" double quote, and \*(R" will give a right double quote. | will give a
37 .\" real vertical bar. \*(C+ will give a nicer C++. Capital omega is used
38 .\" to do unbreakable dashes and therefore won't be available. \*(C` and
39 .\" \*(C' expand to `' in nroff, nothing in troff, for use with C<>
41 .ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
45 . if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
46 . if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch
59 .\" If the F register is turned on, we'll generate index entries on stderr
60 .\" for titles (.TH), headers (.SH), subsections (.Sh), items (.Ip), and
61 .\" index entries marked with X<> in POD. Of course, you'll have to process
62 .\" the output yourself in some meaningful fashion.
65 . tm Index:\\$1\t\\n%\t"\\$2"
71 .\" For nroff, turn off justification. Always turn off hyphenation; it
72 .\" makes way too many mistakes in technical documents.
76 .\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
77 .\" Fear. Run. Save yourself. No user-serviceable parts.
79 . \" fudge factors for nroff and troff
88 . ds #H ((1u-(\\\\n(.fu%2u))*.13m)
94 . \" simple accents for nroff and troff
104 . ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u"
105 . ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u'
106 . ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u'
107 . ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u'
108 . ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u'
109 . ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u'
111 . \" troff and (daisy-wheel) nroff accents
112 .ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V'
113 .ds 8 \h'\*(#H'\(*b\h'-\*(#H'
114 .ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#]
115 .ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H'
116 .ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u'
117 .ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#]
118 .ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#]
119 .ds ae a\h'-(\w'a'u*4/10)'e
120 .ds Ae A\h'-(\w'A'u*4/10)'E
121 . \" corrections for vroff
122 .if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
123 .if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u'
124 . \" for low resolution devices (crt and lpr)
125 .if \n(.H>23 .if \n(.V>19 \
138 .\" ======================================================================
140 .IX Title "OBJ_nid2obj 3"
141 .TH OBJ_nid2obj 3 "0.9.7a" "2003-02-19" "OpenSSL"
144 OBJ_nid2obj, OBJ_nid2ln, OBJ_nid2sn, OBJ_obj2nid, OBJ_txt2nid, OBJ_ln2nid, OBJ_sn2nid,
145 OBJ_cmp, OBJ_dup, OBJ_txt2obj, OBJ_obj2txt, OBJ_create, OBJ_cleanup \- \s-1ASN1\s0 object utility
148 .IX Header "SYNOPSIS"
150 \& ASN1_OBJECT * OBJ_nid2obj(int n);
151 \& const char * OBJ_nid2ln(int n);
152 \& const char * OBJ_nid2sn(int n);
155 \& int OBJ_obj2nid(const ASN1_OBJECT *o);
156 \& int OBJ_ln2nid(const char *ln);
157 \& int OBJ_sn2nid(const char *sn);
160 \& int OBJ_txt2nid(const char *s);
163 \& ASN1_OBJECT * OBJ_txt2obj(const char *s, int no_name);
164 \& int OBJ_obj2txt(char *buf, int buf_len, const ASN1_OBJECT *a, int no_name);
167 \& int OBJ_cmp(const ASN1_OBJECT *a,const ASN1_OBJECT *b);
168 \& ASN1_OBJECT * OBJ_dup(const ASN1_OBJECT *o);
171 \& int OBJ_create(const char *oid,const char *sn,const char *ln);
172 \& void OBJ_cleanup(void);
175 .IX Header "DESCRIPTION"
176 The \s-1ASN1\s0 object utility functions process \s-1ASN1_OBJECT\s0 structures which are
177 a representation of the \s-1ASN1\s0 \s-1OBJECT\s0 \s-1IDENTIFIER\s0 (\s-1OID\s0) type.
179 \&\fIOBJ_nid2obj()\fR, \fIOBJ_nid2ln()\fR and \fIOBJ_nid2sn()\fR convert the \s-1NID\s0 \fBn\fR to
180 an \s-1ASN1_OBJECT\s0 structure, its long name and its short name respectively,
181 or \fB\s-1NULL\s0\fR is an error occurred.
183 \&\fIOBJ_obj2nid()\fR, \fIOBJ_ln2nid()\fR, \fIOBJ_sn2nid()\fR return the corresponding \s-1NID\s0
184 for the object \fBo\fR, the long name <ln> or the short name <sn> respectively
185 or NID_undef if an error occurred.
187 \&\fIOBJ_txt2nid()\fR returns \s-1NID\s0 corresponding to text string <s>. \fBs\fR can be
188 a long name, a short name or the numerical respresentation of an object.
190 \&\fIOBJ_txt2obj()\fR converts the text string \fBs\fR into an \s-1ASN1_OBJECT\s0 structure.
191 If \fBno_name\fR is 0 then long names and short names will be interpreted
192 as well as numerical forms. If \fBno_name\fR is 1 only the numerical form
195 \&\fIOBJ_obj2txt()\fR converts the \fB\s-1ASN1_OBJECT\s0\fR \fBa\fR into a textual representation.
196 The representation is written as a null terminated string to \fBbuf\fR
197 at most \fBbuf_len\fR bytes are written, truncating the result if necessary.
198 The total amount of space required is returned. If \fBno_name\fR is 0 then
199 if the object has a long or short name then that will be used, otherwise
200 the numerical form will be used. If \fBno_name\fR is 1 then the numerical
201 form will always be used.
203 \&\fIOBJ_cmp()\fR compares \fBa\fR to \fBb\fR. If the two are identical 0 is returned.
205 \&\fIOBJ_dup()\fR returns a copy of \fBo\fR.
207 \&\fIOBJ_create()\fR adds a new object to the internal table. \fBoid\fR is the
208 numerical form of the object, \fBsn\fR the short name and \fBln\fR the
209 long name. A new \s-1NID\s0 is returned for the created object.
211 \&\fIOBJ_cleanup()\fR cleans up OpenSSLs internal object table: this should
212 be called before an application exits if any new objects were added
213 using \fIOBJ_create()\fR.
216 Objects in OpenSSL can have a short name, a long name and a numerical
217 identifier (\s-1NID\s0) associated with them. A standard set of objects is
218 represented in an internal table. The appropriate values are defined
219 in the header file \fBobjects.h\fR.
221 For example the \s-1OID\s0 for commonName has the following definitions:
224 \& #define SN_commonName "CN"
225 \& #define LN_commonName "commonName"
226 \& #define NID_commonName 13
228 New objects can be added by calling \fIOBJ_create()\fR.
230 Table objects have certain advantages over other objects: for example
231 their NIDs can be used in a C language switch statement. They are
232 also static constant structures which are shared: that is there
233 is only a single constant structure for each table object.
235 Objects which are not in the table have the \s-1NID\s0 value NID_undef.
237 Objects do not need to be in the internal tables to be processed,
238 the functions \fIOBJ_txt2obj()\fR and \fIOBJ_obj2txt()\fR can process the numerical
239 form of an \s-1OID\s0.
241 .IX Header "EXAMPLES"
242 Create an object for \fBcommonName\fR:
246 \& o = OBJ_nid2obj(NID_commonName);
248 Check if an object is \fBcommonName\fR
251 \& if (OBJ_obj2nid(obj) == NID_commonName)
252 \& /* Do something */
254 Create a new \s-1NID\s0 and initialize an object from it:
259 \& new_nid = OBJ_create("1.2.3.4", "NewOID", "New Object Identifier");
262 \& obj = OBJ_nid2obj(new_nid);
264 Create a new object directly:
267 \& obj = OBJ_txt2obj("1.2.3.4", 1);
271 \&\fIOBJ_obj2txt()\fR is awkward and messy to use: it doesn't follow the
272 convention of other OpenSSL functions where the buffer can be set
273 to \fB\s-1NULL\s0\fR to determine the amount of data that should be written.
274 Instead \fBbuf\fR must point to a valid buffer and \fBbuf_len\fR should
275 be set to a positive value. A buffer length of 80 should be more
276 than enough to handle any \s-1OID\s0 encountered in practice.
278 .IX Header "RETURN VALUES"
279 \&\fIOBJ_nid2obj()\fR returns an \fB\s-1ASN1_OBJECT\s0\fR structure or \fB\s-1NULL\s0\fR is an
282 \&\fIOBJ_nid2ln()\fR and \fIOBJ_nid2sn()\fR returns a valid string or \fB\s-1NULL\s0\fR
285 \&\fIOBJ_obj2nid()\fR, \fIOBJ_ln2nid()\fR, \fIOBJ_sn2nid()\fR and \fIOBJ_txt2nid()\fR return
286 a \s-1NID\s0 or \fBNID_undef\fR on error.
288 .IX Header "SEE ALSO"