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OBJ_nid2ln.3
.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" 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++. 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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" i2t_ASN1_OBJECT, OBJ_length, OBJ_get0_data, 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 <openssl/objects.h> \& \& 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 i2t_ASN1_OBJECT(char *buf, int buf_len, const ASN1_OBJECT *a); \& \& 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); \& \& size_t OBJ_length(const ASN1_OBJECT *obj); \& const unsigned char *OBJ_get0_data(const ASN1_OBJECT *obj); .Ve .PP Deprecated: .PP .Vb 3 \& #if OPENSSL_API_COMPAT < 0x10100000L \& void OBJ_cleanup(void) \& #endif .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. For convenience, OIDs are usually represented in source code as numeric identifiers, or \fI\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 \&\fBOBJ_nid2obj()\fR, \fBOBJ_nid2ln()\fR and \fBOBJ_nid2sn()\fR convert the \s-1NID\s0 \fIn\fR to an \s-1ASN1_OBJECT\s0 structure, its long name and its short name respectively, or \fB\s-1NULL\s0\fR if an error occurred. .PP \&\fBOBJ_obj2nid()\fR, \fBOBJ_ln2nid()\fR, \fBOBJ_sn2nid()\fR return the corresponding \s-1NID\s0 for the object \fIo\fR, the long name <ln> or the short name <sn> respectively or NID_undef if an error occurred. .PP \&\fBOBJ_txt2nid()\fR returns \s-1NID\s0 corresponding to text string \fIs\fR. \fIs\fR can be a long name, a short name or the numerical representation of an object. .PP \&\fBOBJ_txt2obj()\fR converts the text string \fIs\fR into an \s-1ASN1_OBJECT\s0 structure. If \fIno_name\fR is 0 then long names and short names will be interpreted as well as numerical forms. If \fIno_name\fR is 1 only the numerical form is acceptable. .PP \&\fBOBJ_obj2txt()\fR converts the \fB\s-1ASN1_OBJECT\s0\fR \fIa\fR into a textual representation. Unless \fIbuf\fR is \s-1NULL,\s0 the representation is written as a NUL-terminated string to \fIbuf\fR, where at most \fIbuf_len\fR bytes are written, truncating the result if necessary. In any case it returns the total string length, excluding the \s-1NUL\s0 character, required for non-truncated representation, or \-1 on error. If \fIno_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 \fIno_name\fR is 1 then the numerical form will always be used. .PP \&\fBi2t_ASN1_OBJECT()\fR is the same as \fBOBJ_obj2txt()\fR with the \fIno_name\fR set to zero. .PP \&\fBOBJ_cmp()\fR compares \fIa\fR to \fIb\fR. If the two are identical 0 is returned. .PP \&\fBOBJ_dup()\fR returns a copy of \fIo\fR. .PP \&\fBOBJ_create()\fR adds a new object to the internal table. \fIoid\fR is the numerical form of the object, \fIsn\fR the short name and \fIln\fR the long name. A new \s-1NID\s0 is returned for the created object in case of success and NID_undef in case of failure. .PP \&\fBOBJ_length()\fR returns the size of the content octets of \fIobj\fR. .PP \&\fBOBJ_get0_data()\fR returns a pointer to the content octets of \fIobj\fR. The returned pointer is an internal pointer which \fBmust not\fR be freed. .PP \&\fBOBJ_cleanup()\fR releases any resources allocated by creating new objects. .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 \fBOBJ_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 \fBOBJ_txt2obj()\fR and \fBOBJ_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.1 OBJECT IDENTIFIER\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.1\s0 structures. Applications can determine if there is a corresponding \s-1OBJECT IDENTIFIER\s0 by checking \fBOBJ_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 "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBOBJ_nid2obj()\fR returns an \fB\s-1ASN1_OBJECT\s0\fR structure or \fB\s-1NULL\s0\fR is an error occurred. .PP \&\fBOBJ_nid2ln()\fR and \fBOBJ_nid2sn()\fR returns a valid string or \fB\s-1NULL\s0\fR on error. .PP \&\fBOBJ_obj2nid()\fR, \fBOBJ_ln2nid()\fR, \fBOBJ_sn2nid()\fR and \fBOBJ_txt2nid()\fR return a \s-1NID\s0 or \fBNID_undef\fR on error. .PP \&\fBOBJ_add_sigid()\fR returns 1 on success or 0 on error. .PP \&\fBi2t_ASN1_OBJECT()\fR an \fBOBJ_obj2txt()\fR return \-1 on error. On success, they return the length of the string written to \fIbuf\fR if \fIbuf\fR is not \s-1NULL\s0 and \fIbuf_len\fR is big enough, otherwise the total string length. Note that this does not count the trailing \s-1NUL\s0 character. .SH "EXAMPLES" .IX Header "EXAMPLES" Create an object for \fBcommonName\fR: .PP .Vb 1 \& ASN1_OBJECT *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 = OBJ_create("1.2.3.4", "NewOID", "New Object Identifier"); \& ASN1_OBJECT *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 "SEE ALSO" .IX Header "SEE ALSO" \&\fBERR_get_error\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" \&\fBOBJ_cleanup()\fR was deprecated in OpenSSL 1.1.0 by \fBOPENSSL_init_crypto\fR\|(3) and should not be used. .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2002\-2022 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.
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