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# Conflicts:
#	README.md
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Zhi Guan
2017-02-14 16:12:29 +08:00
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doc/crypto/OBJ_nid2obj.pod
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@@ -2,17 +2,19 @@
=head1 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
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
=head1 SYNOPSIS
#include <openssl/objects.h>
ASN1_OBJECT * OBJ_nid2obj(int n);
const char * OBJ_nid2ln(int n);
const char * OBJ_nid2sn(int n);
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);
@@ -20,21 +22,37 @@ functions
int OBJ_txt2nid(const char *s);
ASN1_OBJECT * OBJ_txt2obj(const char *s, int no_name);
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 i2t_ASN1_OBJECT(char *buf, int buf_len, const ASN1_OBJECT *a);
int OBJ_create(const char *oid,const char *sn,const char *ln);
void OBJ_cleanup(void);
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);
Deprecated:
#if OPENSSL_API_COMPAT < 0x10100000L
void OBJ_cleanup(void)
#endif
=head1 DESCRIPTION
The ASN1 object utility functions process ASN1_OBJECT structures which are
a representation of the ASN1 OBJECT IDENTIFIER (OID) type.
For convenience, OIDs are usually represented in source code as numeric
identifiers, or B<NID>s. 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.
OBJ_nid2obj(), OBJ_nid2ln() and OBJ_nid2sn() convert the NID B<n> to
OBJ_nid2obj(), OBJ_nid2ln() and OBJ_nid2sn() convert the NID B<n> to
an ASN1_OBJECT structure, its long name and its short name respectively,
or B<NULL> is an error occurred.
@@ -43,7 +61,7 @@ for the object B<o>, the long name <ln> or the short name <sn> respectively
or NID_undef if an error occurred.
OBJ_txt2nid() returns NID corresponding to text string <s>. B<s> can be
a long name, a short name or the numerical respresentation of an object.
a long name, a short name or the numerical representation of an object.
OBJ_txt2obj() converts the text string B<s> into an ASN1_OBJECT structure.
If B<no_name> is 0 then long names and short names will be interpreted
@@ -58,17 +76,26 @@ if the object has a long or short name then that will be used, otherwise
the numerical form will be used. If B<no_name> is 1 then the numerical
form will always be used.
i2t_ASN1_OBJECT() is the same as OBJ_obj2txt() with the B<no_name> set to zero.
OBJ_cmp() compares B<a> to B<b>. If the two are identical 0 is returned.
OBJ_dup() returns a copy of B<o>.
OBJ_create() adds a new object to the internal table. B<oid> is the
OBJ_create() adds a new object to the internal table. B<oid> is the
numerical form of the object, B<sn> the short name and B<ln> the
long name. A new NID is returned for the created object.
OBJ_cleanup() cleans up OpenSSLs internal object table: this should
be called before an application exits if any new objects were added
using OBJ_create().
OBJ_length() returns the size of the content octets of B<obj>.
OBJ_get0_data() returns a pointer to the content octets of B<obj>.
The returned pointer is an internal pointer which B<must not> be freed.
In OpenSSL versions prior to 1.1.0 OBJ_cleanup() cleaned up OpenSSLs internal
object table and was called before an application exits if any new objects were
added using OBJ_create(). This function is deprecated in version 1.1.0 and now
does nothing if called. No explicit de-initialisation is now required. See
L<OPENSSL_init_crypto(3)> for further information.
=head1 NOTES
@@ -96,6 +123,16 @@ Objects do not need to be in the internal tables to be processed,
the functions OBJ_txt2obj() and OBJ_obj2txt() can process the numerical
form of an OID.
Some objects are used to represent algorithms which do not have a
corresponding ASN.1 OBJECT IDENTIFIER encoding (for example no OID currently
exists for a particular algorithm). As a result they B<cannot> be encoded or
decoded as part of ASN.1 structures. Applications can determine if there
is a corresponding OBJECT IDENTIFIER by checking OBJ_length() is not zero.
These functions cannot return B<const> because an B<ASN1_OBJECT> can
represent both an internal, constant, OID and a dynamically-created one.
The latter cannot be constant because it needs to be freed after use.
=head1 EXAMPLES
Create an object for B<commonName>:
@@ -106,23 +143,24 @@ Create an object for B<commonName>:
Check if an object is B<commonName>
if (OBJ_obj2nid(obj) == NID_commonName)
/* Do something */
/* Do something */
Create a new NID and initialize an object from it:
int new_nid;
ASN1_OBJECT *obj;
new_nid = OBJ_create("1.2.3.4", "NewOID", "New Object Identifier");
obj = OBJ_nid2obj(new_nid);
Create a new object directly:
obj = OBJ_txt2obj("1.2.3.4", 1);
=head1 BUGS
OBJ_obj2txt() is awkward and messy to use: it doesn't follow the
OBJ_obj2txt() is awkward and messy to use: it doesn't follow the
convention of other OpenSSL functions where the buffer can be set
to B<NULL> to determine the amount of data that should be written.
Instead B<buf> must point to a valid buffer and B<buf_len> should
@@ -142,10 +180,19 @@ a NID or B<NID_undef> on error.
=head1 SEE ALSO
L<ERR_get_error(3)|ERR_get_error(3)>
L<ERR_get_error(3)>
=head1 HISTORY
TBA
OBJ_cleanup() was deprecated in OpenSSL 1.1.0.
=head1 COPYRIGHT
Copyright 2002-2016 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the OpenSSL license (the "License"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file LICENSE in the source distribution or at
L<https://www.openssl.org/source/license.html>.
=cut