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.\" $OpenBSD: PKCS8_pkey_set0.3,v 1.2 2021/10/25 13:48:12 schwarze Exp $
.\"
.\" Copyright (c) 2021 Ingo Schwarze <schwarze@openbsd.org>
.\"
.\" 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. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.Dd $Mdocdate: October 25 2021 $
.Dt PKCS8_PKEY_SET0 3
.Os
.Sh NAME
.Nm PKCS8_pkey_set0 ,
.Nm PKCS8_pkey_get0 ,
.Nm PKCS8_pkey_add1_attr_by_NID ,
.Nm PKCS8_pkey_get0_attrs
.Nd change and inspect PKCS#8 PrivateKeyInfo objects
.Sh SYNOPSIS
.In openssl/x509.h
.Ft int
.Fo PKCS8_pkey_set0
.Fa "PKCS8_PRIV_KEY_INFO *keyinfo"
.Fa "ASN1_OBJECT *aobj"
.Fa "int version"
.Fa "int ptype"
.Fa "void *pval"
.Fa "unsigned char *data"
.Fa "int len"
.Fc
.Ft int
.Fo PKCS8_pkey_get0
.Fa "const ASN1_OBJECT **paobj"
.Fa "const unsigned char **pdata"
.Fa "int *plen"
.Fa "const X509_ALGOR **palgor"
.Fa "const PKCS8_PRIV_KEY_INFO *keyinfo"
.Fc
.Ft int
.Fo PKCS8_pkey_add1_attr_by_NID
.Fa "PKCS8_PRIV_KEY_INFO *keyinfo"
.Fa "int nid"
.Fa "int type"
.Fa "const unsigned char *data"
.Fa "int len"
.Fc
.Ft const STACK_OF(X509_ATTRIBUTE) *
.Fo PKCS8_pkey_get0_attrs
.Fa "const PKCS8_PRIV_KEY_INFO *keyinfo"
.Fc
.Sh DESCRIPTION
.Fn PKCS8_pkey_set0
initializes the
.Fa keyinfo
object.
The algorithm is set to
.Fa aobj
with the associated parameter type
.Fa ptype
and parameter value
.Fa pval
using
.Xr X509_ALGOR_set0 3 ,
replacing any previous information about the algorithm.
Unless
.Fa data
is
.Dv NULL ,
the encoded private key is set to the
.Fa len
bytes starting at
.Fa data
using
.Xr ASN1_STRING_set0 3 ,
not performing any validation.
If
.Fa data
is
.Dv NULL ,
the key data remains unchanged.
If the
.Fa version
argument is greater than or equal to 0, it replaces any existing version;
otherwise, the version remains unchanged.
If
.Fa keyinfo
contains any attributes, they remain unchanged.
.Pp
.Fn PKCS8_pkey_get0
retrieves some information from the
.Fa keyinfo
object.
Internal pointers to the algorithm OID, the
.Vt AlgorithmIdentifier ,
and the encoded private key are stored in
.Pf * Fa paobj ,
.Pf * Fa palgor ,
and
.Pf * Fa pdata ,
respectively.
.Dv NULL
pointers can be passed for any of these three arguments if the respective
information is not needed.
Unless
.Fa pdata
is
.Dv NULL ,
.Pf * Fa plen
is set to the number of bytes in
.Pf * Fa pdata .
.Pp
.Fn PKCS8_pkey_add1_attr_by_NID
creates a new X.501 Attribute object using
.Xr X509_ATTRIBUTE_create_by_NID 3
and appends it to the attributes of
.Fa keyinfo
using
.Xr X509at_add1_attr 3 .
.Sh RETURN VALUES
.Fn PKCS8_pkey_set0
and
.Fn PKCS8_pkey_add1_attr_by_NID
return 1 for success or 0 for failure.
.Pp
.Fn PKCS8_pkey_get0
always returns 1.
.Pp
.Fn PKCS8_pkey_get0_attrs
returns an internal pointer to the array of attributes associated with
.Fa keyinfo
or
.Dv NULL
if no attributes are set.
.Sh SEE ALSO
.Xr ASN1_STRING_set0 3 ,
.Xr EVP_PKCS82PKEY 3 ,
.Xr OBJ_nid2obj 3 ,
.Xr PKCS8_PRIV_KEY_INFO_new 3 ,
.Xr STACK_OF 3 ,
.Xr X509_ALGOR_new 3 ,
.Xr X509_ATTRIBUTE_create_by_NID 3 ,
.Xr X509_ATTRIBUTE_new 3 ,
.Xr X509at_add1_attr 3 ,
.Xr X509at_get_attr 3
.Sh HISTORY
.Fn PKCS8_pkey_set0
and
.Fn PKCS8_pkey_get0
first appeared in OpenSSL 1.0.0 and have been available since
.Ox 4.9 .
.Pp
.Fn PKCS8_pkey_add1_attr_by_NID
and
.Fn PKCS8_pkey_get0_attrs
first appeared in OpenSSL 1.1.0 and have been available since
.Ox 6.4 .
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