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OBJ_ln2nid.3
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For convenience, OIDs are usually represented in source code as numeric identifiers, or \fB\s-1NID\s0\fRs. OpenSSL has an internal table of OIDs that are generated when the library is built, and their corresponding NIDs are available as defined constants. For the functions below, application code should treat all returned values \*(-- OIDs, NIDs, or names \*(-- as constants. .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 .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. .PP Some objects are used to represent algorithms which do not have a corresponding \s-1ASN\s0.1 \s-1OBJECT\s0 \s-1IDENTIFIER\s0 encoding (for example no \s-1OID\s0 currently exists for a particular algorithm). As a result they \fBcannot\fR be encoded or decoded as part of \s-1ASN\s0.1 structures. Applications can determine if there is a corresponding \s-1OBJECT\s0 \s-1IDENTIFIER\s0 by checking \fIOBJ_length()\fR is not zero. .PP These functions cannot return \fBconst\fR because an \fB\s-1ASN1_OBJECT\s0\fR can represent both an internal, constant, \s-1OID\s0 and a dynamically-created one. The latter cannot be constant because it needs to be freed after use. .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 2 \& int new_nid; \& ASN1_OBJECT *obj; .Ve .PP .Vb 1 \& new_nid = OBJ_create("1.2.3.4", "NewOID", "New Object Identifier"); .Ve .PP .Vb 1 \& 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. It returns a pointer to an internal table and does not allocate memory; \fIASN1_OBJECT_free()\fR will have no effect. .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