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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .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 \- ASN1 object utility functions .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include \& \& ASN1_OBJECT * OBJ_nid2obj(int n); \& const char * OBJ_nid2ln(int n); \& const char * OBJ_nid2sn(int n); \& \& int OBJ_obj2nid(const ASN1_OBJECT *o); \& int OBJ_ln2nid(const char *ln); \& int OBJ_sn2nid(const char *sn); \& \& int OBJ_txt2nid(const char *s); \& \& 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); \& \& int OBJ_cmp(const ASN1_OBJECT *a,const ASN1_OBJECT *b); \& ASN1_OBJECT * OBJ_dup(const ASN1_OBJECT *o); \& \& 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 OBJECT IDENTIFIER \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 or the short name respectively or NID_undef if an error occurred. .PP \&\fIOBJ_txt2nid()\fR returns \s-1NID\s0 corresponding to text string . \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 .PP 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 .PP Check if an object is \fBcommonName\fR .PP .Vb 2 \& if (OBJ_obj2nid(obj) == NID_commonName) \& /* Do something */ .Ve .PP 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"); \& \& obj = OBJ_nid2obj(new_nid); .Ve .PP 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" \&\fIERR_get_error\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" \&\s-1TBA\s0