.\" $OpenBSD: X509_NAME_ENTRY_get_object.3,v 1.16 2021/12/10 16:58:20 schwarze Exp $ .\" full merge up to: OpenSSL aebb9aac Jul 19 09:27:53 2016 -0400 .\" selective merge up to: OpenSSL ca34e08d Dec 12 07:38:07 2018 +0100 .\" .\" This file is a derived work. .\" The changes are covered by the following Copyright and license: .\" .\" Copyright (c) 2016, 2018, 2019, 2021 Ingo Schwarze .\" .\" Permission to use, copy, modify, and distribute this software for any .\" purpose with or without fee is hereby granted, provided that the above .\" copyright notice and this permission notice appear in all copies. .\" .\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES .\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF .\" MERCHANTABILITY AND FITNESS. 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IN NO EVENT SHALL THE OpenSSL PROJECT OR .\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, .\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT .\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; .\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, .\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED .\" OF THE POSSIBILITY OF SUCH DAMAGE. .\" .Dd $Mdocdate: December 10 2021 $ .Dt X509_NAME_ENTRY_GET_OBJECT 3 .Os .Sh NAME .Nm X509_NAME_ENTRY_new , .Nm X509_NAME_ENTRY_free , .Nm X509_NAME_ENTRY_get_object , .Nm X509_NAME_ENTRY_get_data , .Nm X509_NAME_ENTRY_set , .Nm X509_NAME_ENTRY_set_object , .Nm X509_NAME_ENTRY_set_data , .Nm X509_NAME_ENTRY_create_by_txt , .Nm X509_NAME_ENTRY_create_by_NID , .Nm X509_NAME_ENTRY_create_by_OBJ .\" In the following line, "X.501" is not a typo. .\" This object defined in X.501, not in X.509. .Nd X.501 relative distinguished name .Sh SYNOPSIS .In openssl/x509.h .Ft X509_NAME_ENTRY * .Fn X509_NAME_ENTRY_new void .Ft void .Fo X509_NAME_ENTRY_free .Fa "X509_NAME_ENTRY* ne" .Fc .Ft ASN1_OBJECT * .Fo X509_NAME_ENTRY_get_object .Fa "const X509_NAME_ENTRY *ne" .Fc .Ft ASN1_STRING * .Fo X509_NAME_ENTRY_get_data .Fa "const X509_NAME_ENTRY *ne" .Fc .Ft int .Fo X509_NAME_ENTRY_set .Fa "const X509_NAME_ENTRY *ne" .Fc .Ft int .Fo X509_NAME_ENTRY_set_object .Fa "X509_NAME_ENTRY *ne" .Fa "const ASN1_OBJECT *obj" .Fc .Ft int .Fo X509_NAME_ENTRY_set_data .Fa "X509_NAME_ENTRY *ne" .Fa "int type" .Fa "const unsigned char *bytes" .Fa "int len" .Fc .Ft X509_NAME_ENTRY * .Fo X509_NAME_ENTRY_create_by_txt .Fa "X509_NAME_ENTRY **ne" .Fa "const char *field" .Fa "int type" .Fa "const unsigned char *bytes" .Fa "int len" .Fc .Ft X509_NAME_ENTRY * .Fo X509_NAME_ENTRY_create_by_NID .Fa "X509_NAME_ENTRY **ne" .Fa "int nid" .Fa "int type" .Fa "const unsigned char *bytes" .Fa "int len" .Fc .Ft X509_NAME_ENTRY * .Fo X509_NAME_ENTRY_create_by_OBJ .Fa "X509_NAME_ENTRY **ne" .Fa "const ASN1_OBJECT *obj" .Fa "int type" .Fa "const unsigned char *bytes" .Fa "int len" .Fc .Sh DESCRIPTION An X.501 .Vt RelativeDistinguishedName is an ordered set of field type and value pairs. It is the building block for constructing X.501 .Vt Name objects. The .Vt X509_NAME_ENTRY object stores one such pair, containing one field type and one value. .Pp .Vt X509_NAME_ENTRY objects are intended for use by the .Vt X509_NAME objects documented in .Xr X509_NAME_new 3 . Since part of the information about how several .Vt X509_NAME_ENTRY objects combine to form an X.501 .Vt Name is stored in the individual .Vt X509_NAME_ENTRY objects rather than in the .Vt X509_NAME object, any given .Vt X509_NAME_ENTRY object can only be used by one .Vt X509_NAME object at a time. .Pp .Fn X509_NAME_ENTRY_new allocates and initializes an empty .Vt X509_NAME_ENTRY object, representing an ASN.1 .Vt RelativeDistinguishedName structure defined in RFC 5280 section 4.1.2.4, but containing not more than one type-value-pair. .Pp .Fn X509_NAME_ENTRY_free frees .Fa ne and the type and value contained in it. .Pp .Fn X509_NAME_ENTRY_get_object retrieves the field type of .Fa ne in an .Vt ASN1_OBJECT structure. .Fn X509_NAME_ENTRY_get_data retrieves the field value of .Fa ne in an .Vt ASN1_STRING structure. These two functions can be used to examine an .Vt X509_NAME_ENTRY object as returned by .Xr X509_NAME_get_entry 3 . .Pp .Fn X509_NAME_ENTRY_set retrieves the index of the X.501 .Vt RelativeDistinguishedName Pq RDN that .Fa ne is part of in the X.501 .Vt Name object using it. The first RDN has index 0. If an RDN consists of more than one .Vt X509_NAME_ENTRY object, they all share the same index. In practice, RDNs containing more than one type-value-pair are rarely used, so if an .Va X509_NAME *name object uses .Fa ne , then .Fn X509_NAME_ENTRY_set ne usually agrees with .Fn sk_X509_NAME_ENTRY_find name->entries ne , but when multi-pair RDNs are used, it may be smaller. .Pp .Fn X509_NAME_ENTRY_set_object sets the field type of .Fa ne to .Fa obj . .Pp .Fn X509_NAME_ENTRY_set_data sets the field value of .Fa ne to the given string .Fa type and the value determined by .Fa bytes and .Fa len . If the .Fa type argument is positive and includes the .Fa MBSTRING_FLAG bit, .Xr ASN1_STRING_set_by_NID 3 is used for setting the value, passing the .Fa type as the .Fa inform argument and using the .Fa nid corresponding to .Fa ne . Otherwise, if the .Fa type argument is .Dv V_ASN1_APP_CHOOSE , the type of .Fa ne is set to the return value of .Xr ASN1_PRINTABLE_type 3 . .Pp .Fn X509_NAME_ENTRY_create_by_txt , .Fn X509_NAME_ENTRY_create_by_NID , and .Fn X509_NAME_ENTRY_create_by_OBJ create and return an .Vt X509_NAME_ENTRY structure. .Pp Except for .Fn X509_NAME_ENTRY_get_object and .Fn X509_NAME_ENTRY_get_data , these functions are rarely used because .Vt X509_NAME_ENTRY structures are almost always part of .Vt X509_NAME structures and the functions described in .Xr X509_NAME_add_entry_by_txt 3 are typically used to create and add new entries in a single operation. .Pp The arguments of these functions support similar options to the similarly named ones described in .Xr X509_NAME_add_entry_by_txt 3 . So for example .Fa type can be set to .Dv MBSTRING_ASC , but in the case of .Fn X509_NAME_ENTRY_set_data the field type must be set first so the relevant field information can be looked up internally. .Sh RETURN VALUES The .Fn X509_NAME_ENTRY_new function returns a valid .Vt X509_NAME_ENTRY structure if successful; otherwise .Dv NULL is returned and an error code can be retrieved with .Xr ERR_get_error 3 . .Pp .Fn X509_NAME_ENTRY_get_object returns a valid .Vt ASN1_OBJECT structure if it is set or .Dv NULL if an error occurred. .Pp .Fn X509_NAME_ENTRY_get_data returns a valid .Vt ASN1_STRING structure if it is set or .Dv NULL if an error occurred. .Pp .Fn X509_NAME_ENTRY_set returns the zero-based index of the RDN .Fa ne is used in, or 0 if .Fa ne is not yet used by any .Vt X509_NAME object. .Pp The .Fn X509_NAME_ENTRY_set_object function returns 1 if successful; otherwise 0 is returned and an error code can be retrieved with .Xr ERR_get_error 3 . .Pp .Fn X509_NAME_ENTRY_set_data returns 1 on success or 0 on error. In some cases of failure, the reason can be determined with .Xr ERR_get_error 3 . .Pp .Fn X509_NAME_ENTRY_create_by_txt , .Fn X509_NAME_ENTRY_create_by_NID , and .Fn X509_NAME_ENTRY_create_by_OBJ return a valid .Vt X509_NAME_ENTRY structure on success or .Dv NULL if an error occurred. In some cases of failure, the reason can be determined with .Xr ERR_get_error 3 . .Sh SEE ALSO .Xr OBJ_nid2obj 3 , .Xr X509_NAME_add_entry 3 , .Xr X509_NAME_get_entry 3 , .Xr X509_NAME_new 3 .Sh STANDARDS RFC 5280: Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile .Pp ITU-T Recommendation X.501, also known as ISO/IEC 9594-2: Information Technology Open Systems Interconnection The Directory: Models, section 9.3: Relative distinguished name .Sh HISTORY .Fn X509_NAME_ENTRY_new and .Fn X509_NAME_ENTRY_free first appeared in SSLeay 0.5.1. .Fn X509_NAME_ENTRY_get_object , .Fn X509_NAME_ENTRY_get_data , .Fn X509_NAME_ENTRY_set_object , .Fn X509_NAME_ENTRY_set_data , .Fn X509_NAME_ENTRY_create_by_NID , and .Fn X509_NAME_ENTRY_create_by_OBJ first appeared in SSLeay 0.8.0. These functions have been available since .Ox 2.4 . .Pp .Fn X509_NAME_ENTRY_create_by_txt first appeared in OpenSSL 0.9.5 and has been available since .Ox 2.7 . .Pp .Fn X509_NAME_ENTRY_set first appeared in OpenSSL 1.1.0 and has been available since .Ox 6.3 . .Sh CAVEATS Despite its name, .Fn X509_NAME_ENTRY_set does not set anything. Something like .Dq X509_NAME_ENTRY_get_set would have been a better name.