.\" $OpenBSD: X509_REQ_add1_attr.3,v 1.4 2024/09/02 07:56:28 tb Exp $
.\"
.\" Copyright (c) 2021 Ingo Schwarze <schwarze@openbsd.org>
.\"
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.Dd $Mdocdate: September 2 2024 $
.Dt X509_REQ_ADD1_ATTR 3
.Os
.Sh NAME
.Nm X509_REQ_add1_attr ,
.Nm X509_REQ_add1_attr_by_OBJ ,
.Nm X509_REQ_add1_attr_by_NID ,
.Nm X509_REQ_add1_attr_by_txt ,
.Nm X509_REQ_delete_attr ,
.Nm X509_REQ_get_attr ,
.Nm X509_REQ_get_attr_count ,
.Nm X509_REQ_get_attr_by_OBJ ,
.Nm X509_REQ_get_attr_by_NID
.Nd X.501 Attributes of PKCS#10 certification requests
.Sh SYNOPSIS
.In openssl/x509.h
.Ft int
.Fo X509_REQ_add1_attr
.Fa "X509_REQ *req"
.Fa "X509_ATTRIBUTE *attr"
.Fc
.Ft int
.Fo X509_REQ_add1_attr_by_OBJ
.Fa "X509_REQ *req"
.Fa "const ASN1_OBJECT *obj"
.Fa "int type"
.Fa "const unsigned char *data"
.Fa "int len"
.Fc
.Ft int
.Fo X509_REQ_add1_attr_by_NID
.Fa "X509_REQ *req"
.Fa "int nid"
.Fa "int type"
.Fa "const unsigned char *data"
.Fa "int len"
.Fc
.Ft int
.Fo X509_REQ_add1_attr_by_txt
.Fa "X509_REQ *req"
.Fa "const char *name"
.Fa "int type"
.Fa "const unsigned char *data"
.Fa "int len"
.Fc
.Ft X509_ATTRIBUTE *
.Fo X509_REQ_delete_attr
.Fa "X509_REQ *req"
.Fa "int index"
.Fc
.Ft X509_ATTRIBUTE *
.Fo X509_REQ_get_attr
.Fa "const X509_REQ *req"
.Fa "int index"
.Fc
.Ft int
.Fo X509_REQ_get_attr_count
.Fa "const X509_REQ *req"
.Fc
.Ft int
.Fo X509_REQ_get_attr_by_OBJ
.Fa "const X509_REQ *req"
.Fa "const ASN1_OBJECT *obj"
.Fa "int start_after"
.Fc
.Ft int
.Fo X509_REQ_get_attr_by_NID
.Fa "const X509_REQ *req"
.Fa "int nid"
.Fa "int start_after"
.Fc
.Sh DESCRIPTION
These functions support associating an array of X.501 Attributes
with a PKCS#10 certification request.
.Pp
.Fn X509_REQ_add1_attr
appends a deep copy of the
.Fa attr ,
allocating a new array if necessary.
.Pp
.Fn X509_REQ_add1_attr_by_OBJ ,
.Fn X509_REQ_add1_attr_by_NID ,
and
.Fn X509_REQ_add1_attr_by_txt
create a new X.501 Attribute object using
.Xr X509_ATTRIBUTE_create_by_OBJ 3 ,
.Xr X509_ATTRIBUTE_create_by_NID 3 ,
or
.Xr X509_ATTRIBUTE_create_by_txt 3 ,
respectively,
allocating a new array if necessary.
.Pp
.Fn X509_REQ_delete_attr
deletes the attribute with the zero-based
.Fa index .
.Pp
.Fn X509_REQ_get_attr
returns the attribute with the zero-based
.Fa index .
.Pp
.Fn X509_REQ_get_attr_count
returns the number of attributes currently associated with
.Fa req .
.Pp
.Fn X509_REQ_get_attr_by_OBJ
and
.Fn X509_REQ_get_attr_by_NID
search for an attribute of the type
.Fa obj
or
.Fa nid .
.Sh RETURN VALUES
.Fn X509_REQ_add1_attr ,
.Fn X509_REQ_add1_attr_by_OBJ ,
.Fn X509_REQ_add1_attr_by_NID ,
and
.Fn X509_REQ_add1_attr_by_txt
return 1 for success or 0 for failure.
.Pp
.Fn X509_REQ_delete_attr
and
.Fn X509_REQ_get_attr
return the deleted or requested attribute or
.Dv NULL
if the requested index is negative or greater than or equal to
the current number of attributes associated with
.Fa req .
.Pp
.Fn X509_REQ_get_attr_count
returns the current number of attributes.
.Pp
.Fn X509_REQ_get_attr_by_OBJ
and
.Fn X509_REQ_get_attr_by_NID
return the index of the first attribute that has an index greater than
.Fa start_after
and a type matching
.Fa obj
or
.Fa nid ,
respectively, or \-1 on failure.
In addition,
.Fn X509_REQ_get_attr_by_NID
returns \-2 if
.Xr OBJ_nid2obj 3
fails on the requested
.Fa nid .
.Sh SEE ALSO
.Xr OBJ_nid2obj 3 ,
.Xr X509_ATTRIBUTE_create_by_OBJ 3 ,
.Xr X509_ATTRIBUTE_new 3 ,
.Xr X509_REQ_new 3
.Sh HISTORY
These functions first appeared in OpenSSL 0.9.5
and have been available since
.Ox 2.7 .