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Diffstat (limited to 'openssl/doc/crypto/OBJ_nid2obj.pod')
-rw-r--r-- | openssl/doc/crypto/OBJ_nid2obj.pod | 170 |
1 files changed, 0 insertions, 170 deletions
diff --git a/openssl/doc/crypto/OBJ_nid2obj.pod b/openssl/doc/crypto/OBJ_nid2obj.pod deleted file mode 100644 index b8d2896..0000000 --- a/openssl/doc/crypto/OBJ_nid2obj.pod +++ /dev/null @@ -1,170 +0,0 @@ -=pod - -=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 - -=head1 SYNOPSIS - - #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 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); - -=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 -an ASN1_OBJECT structure, its long name and its short name respectively, -or B<NULL> is an error occurred. - -OBJ_obj2nid(), OBJ_ln2nid(), OBJ_sn2nid() return the corresponding NID -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. - -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 -as well as numerical forms. If B<no_name> is 1 only the numerical form -is acceptable. - -OBJ_obj2txt() converts the B<ASN1_OBJECT> B<a> into a textual representation. -The representation is written as a null terminated string to B<buf> -at most B<buf_len> bytes are written, truncating the result if necessary. -The total amount of space required is returned. If B<no_name> 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 B<no_name> is 1 then the numerical -form will always be used. - -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 -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(). - -=head1 NOTES - -Objects in OpenSSL can have a short name, a long name and a numerical -identifier (NID) associated with them. A standard set of objects is -represented in an internal table. The appropriate values are defined -in the header file B<objects.h>. - -For example the OID for commonName has the following definitions: - - #define SN_commonName "CN" - #define LN_commonName "commonName" - #define NID_commonName 13 - -New objects can be added by calling OBJ_create(). - -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. - -Objects which are not in the table have the NID value NID_undef. - -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>: - - ASN1_OBJECT *o; - o = OBJ_nid2obj(NID_commonName); - -Check if an object is B<commonName> - - if (OBJ_obj2nid(obj) == NID_commonName) - /* 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 -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 -be set to a positive value. A buffer length of 80 should be more -than enough to handle any OID encountered in practice. - -=head1 RETURN VALUES - -OBJ_nid2obj() returns an B<ASN1_OBJECT> structure or B<NULL> is an -error occurred. -It returns a pointer to an internal table and does not -allocate memory; ASN1_OBJECT_free() will have no effect. - -OBJ_nid2ln() and OBJ_nid2sn() returns a valid string or B<NULL> -on error. - -OBJ_obj2nid(), OBJ_ln2nid(), OBJ_sn2nid() and OBJ_txt2nid() return -a NID or B<NID_undef> on error. - -=head1 SEE ALSO - -L<ERR_get_error(3)|ERR_get_error(3)> - -=head1 HISTORY - -TBA - -=cut |