.\" $OpenBSD: EVP_PKEY_set1_RSA.3,v 1.20 2023/08/27 13:08:15 schwarze Exp $
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.Dd $Mdocdate: August 27 2023 $
.Dt EVP_PKEY_SET1_RSA 3
.Os
.Sh NAME
.Nm EVP_PKEY_set1_RSA ,
.Nm EVP_PKEY_set1_DSA ,
.Nm EVP_PKEY_set1_DH ,
.Nm EVP_PKEY_set1_EC_KEY ,
.Nm EVP_PKEY_get1_RSA ,
.Nm EVP_PKEY_get1_DSA ,
.Nm EVP_PKEY_get1_DH ,
.Nm EVP_PKEY_get1_EC_KEY ,
.Nm EVP_PKEY_get0_RSA ,
.Nm EVP_PKEY_get0_DSA ,
.Nm EVP_PKEY_get0_DH ,
.Nm EVP_PKEY_get0_EC_KEY ,
.Nm EVP_PKEY_get0_hmac ,
.Nm EVP_PKEY_get0 ,
.Nm EVP_PKEY_assign_RSA ,
.Nm EVP_PKEY_assign_DSA ,
.Nm EVP_PKEY_assign_DH ,
.Nm EVP_PKEY_assign_EC_KEY ,
.Nm EVP_PKEY_assign_GOST ,
.Nm EVP_PKEY_assign ,
.Nm EVP_PKEY_base_id ,
.Nm EVP_PKEY_id ,
.Nm EVP_PKEY_type ,
.Nm EVP_PKEY_set_type ,
.Nm EVP_PKEY_set_type_str
.\" The function X509_certificate_type(3) is intentionally undocumented
.\" and scheduled for deletion from the library.  BoringSSL already
.\" deleted it and OpenSSL deprecates it in version 3.0.
.Nd EVP_PKEY assignment functions
.Sh SYNOPSIS
.In openssl/evp.h
.Ft int
.Fo EVP_PKEY_set1_RSA
.Fa "EVP_PKEY *pkey"
.Fa "RSA *key"
.Fc
.Ft int
.Fo EVP_PKEY_set1_DSA
.Fa "EVP_PKEY *pkey"
.Fa "DSA *key"
.Fc
.Ft int
.Fo EVP_PKEY_set1_DH
.Fa "EVP_PKEY *pkey"
.Fa "DH *key"
.Fc
.Ft int
.Fo EVP_PKEY_set1_EC_KEY
.Fa "EVP_PKEY *pkey"
.Fa "EC_KEY *key"
.Fc
.Ft RSA *
.Fo EVP_PKEY_get1_RSA
.Fa "EVP_PKEY *pkey"
.Fc
.Ft DSA *
.Fo EVP_PKEY_get1_DSA
.Fa "EVP_PKEY *pkey"
.Fc
.Ft DH *
.Fo EVP_PKEY_get1_DH
.Fa "EVP_PKEY *pkey"
.Fc
.Ft EC_KEY *
.Fo EVP_PKEY_get1_EC_KEY
.Fa "EVP_PKEY *pkey"
.Fc
.Ft RSA *
.Fo EVP_PKEY_get0_RSA
.Fa "EVP_PKEY *pkey"
.Fc
.Ft DSA *
.Fo EVP_PKEY_get0_DSA
.Fa "EVP_PKEY *pkey"
.Fc
.Ft DH *
.Fo EVP_PKEY_get0_DH
.Fa "EVP_PKEY *pkey"
.Fc
.Ft EC_KEY *
.Fo EVP_PKEY_get0_EC_KEY
.Fa "EVP_PKEY *pkey"
.Fc
.Ft const unsigned char *
.Fo EVP_PKEY_get0_hmac
.Fa "const EVP_PKEY *pkey"
.Fa "size_t *len"
.Fc
.Ft void *
.Fo EVP_PKEY_get0
.Fa "const EVP_PKEY *pkey"
.Fc
.Ft int
.Fo EVP_PKEY_assign_RSA
.Fa "EVP_PKEY *pkey"
.Fa "RSA *key"
.Fc
.Ft int
.Fo EVP_PKEY_assign_DSA
.Fa "EVP_PKEY *pkey"
.Fa "DSA *key"
.Fc
.Ft int
.Fo EVP_PKEY_assign_DH
.Fa "EVP_PKEY *pkey"
.Fa "DH *key"
.Fc
.Ft int
.Fo EVP_PKEY_assign_EC_KEY
.Fa "EVP_PKEY *pkey"
.Fa "EC_KEY *key"
.Fc
.Ft int
.Fo EVP_PKEY_assign_GOST
.Fa "EVP_PKEY *pkey"
.Fa "GOST_KEY *key"
.Fc
.Ft int
.Fo EVP_PKEY_assign
.Fa "EVP_PKEY *pkey"
.Fa "int type"
.Fa "void *key"
.Fc
.Ft int
.Fo EVP_PKEY_base_id
.Fa "EVP_PKEY *pkey"
.Fc
.Ft int
.Fo EVP_PKEY_id
.Fa "EVP_PKEY *pkey"
.Fc
.Ft int
.Fo EVP_PKEY_type
.Fa "int type"
.Fc
.Ft int
.Fo EVP_PKEY_set_type
.Fa "EVP_PKEY *pkey"
.Fa "int type"
.Fc
.Ft int
.Fo EVP_PKEY_set_type_str
.Fa "EVP_PKEY *pkey"
.Fa "const char *str"
.Fa "int len"
.Fc
.Sh DESCRIPTION
.Fn EVP_PKEY_set1_RSA ,
.Fn EVP_PKEY_set1_DSA ,
.Fn EVP_PKEY_set1_DH ,
and
.Fn EVP_PKEY_set1_EC_KEY
set the key referenced by
.Fa pkey
to
.Fa key
and increment the reference count of
.Fa key
by 1 in case of success.
.Pp
.Fn EVP_PKEY_get1_RSA ,
.Fn EVP_PKEY_get1_DSA ,
.Fn EVP_PKEY_get1_DH ,
and
.Fn EVP_PKEY_get1_EC_KEY
return the key referenced in
.Fa pkey ,
incrementing its reference count by 1, or
.Dv NULL
if the key is not of the correct type.
.Pp
.Fn EVP_PKEY_get0_RSA ,
.Fn EVP_PKEY_get0_DSA ,
.Fn EVP_PKEY_get0_DH ,
.Fn EVP_PKEY_get0_EC_KEY ,
and
.Fn EVP_PKEY_get0
are identical except that they do not increment the reference count.
Consequently, the returned key must not be freed by the caller.
.Pp
.Fn EVP_PKEY_get0_hmac
returns an internal pointer to the key referenced in
.Fa pkey
and sets
.Pf * Fa len
to its length in bytes.
The returned pointer must not be freed by the caller.
If
.Fa pkey
is not of the correct type,
.Dv NULL
is returned and the content of
.Pf * Fa len
becomes unspecified.
.Pp
.Fn EVP_PKEY_assign_RSA ,
.Fn EVP_PKEY_assign_DSA ,
.Fn EVP_PKEY_assign_DH ,
.Fn EVP_PKEY_assign_EC_KEY ,
.Fn EVP_PKEY_assign_GOST ,
and
.Fn EVP_PKEY_assign
also set the referenced key to
.Fa key ;
however these use the supplied
.Fa key
internally without incrementing its reference count, such that
.Fa key
will be freed when the parent
.Fa pkey
is freed.
If the
.Fa key
is of the wrong type, these functions report success even though
.Fa pkey
ends up in a corrupted state.
Even the functions explicitly containing the type in their name are
.Em not
type safe because they are implemented as macros.
The following types are supported:
.Dv EVP_PKEY_RSA ,
.Dv EVP_PKEY_DSA ,
.Dv EVP_PKEY_DH ,
.Dv EVP_PKEY_EC ,
and
.Dv EVP_PKEY_GOSTR01 .
.Pp
.Fn EVP_PKEY_base_id
returns the type of
.Fa pkey
according to the following table:
.Pp
.Bl -column -compact -offset 2n EVP_PKEY_GOSTR NID_X9_62_id_ecPublicKey
.It Sy return value      Ta                               Ta Sy PEM type string
.It Dv EVP_PKEY_CMAC     Ta = Dv NID_cmac                 Ta CMAC
.It Dv EVP_PKEY_DH       Ta = Dv NID_dhKeyAgreement       Ta DH
.It Dv EVP_PKEY_DSA      Ta = Dv NID_dsa                  Ta DSA
.It Dv EVP_PKEY_EC       Ta = Dv NID_X9_62_id_ecPublicKey Ta EC
.It Dv EVP_PKEY_GOSTIMIT Ta = Dv NID_id_Gost28147_89_MAC  Ta GOST-MAC
.It Dv EVP_PKEY_GOSTR01  Ta = Dv NID_id_GostR3410_2001    Ta GOST2001
.It Dv EVP_PKEY_HMAC     Ta = Dv NID_hmac                 Ta HMAC
.It Dv EVP_PKEY_RSA      Ta = Dv NID_rsaEncryption        Ta RSA
.It Dv EVP_PKEY_RSA_PSS  Ta = Dv NID_rsassaPss            Ta RSA-PSS
.El
.Pp
Application programs can support additional key types by calling
.Xr EVP_PKEY_asn1_add0 3 .
.Pp
.Fn EVP_PKEY_id
returns the actual OID associated with
.Fa pkey .
Historically keys using the same algorithm could use different OIDs.
The following deprecated aliases are still supported:
.Pp
.Bl -column -compact -offset 2n EVP_PKEY_GOSTR12_ NID_id_tc26_gost3410_2012_512
.It Sy return value         Ta                                  Ta Sy alias for
.It Dv EVP_PKEY_DSA1        Ta = Dv NID_dsa_2                     Ta DSA
.It Dv EVP_PKEY_DSA2        Ta = Dv NID_dsaWithSHA                Ta DSA
.It Dv EVP_PKEY_DSA3        Ta = Dv NID_dsaWithSHA1               Ta DSA
.It Dv EVP_PKEY_DSA4        Ta = Dv NID_dsaWithSHA1_2             Ta DSA
.It Dv EVP_PKEY_GOSTR12_256 Ta = Dv NID_id_tc26_gost3410_2012_256 Ta GOST2001
.It Dv EVP_PKEY_GOSTR12_512 Ta = Dv NID_id_tc26_gost3410_2012_512 Ta GOST2001
.It Dv EVP_PKEY_RSA2        Ta = Dv NID_rsa                       Ta RSA
.El
.Pp
Application programs can support additional alternative OIDs by calling
.Xr EVP_PKEY_asn1_add_alias 3 .
.Pp
Most applications wishing to know a key type will simply call
.Fn EVP_PKEY_base_id
and will not care about the actual type,
which will be identical in almost all cases.
.Pp
.Fn EVP_PKEY_type
returns the underlying type of the NID
.Fa type .
For example,
.Fn EVP_PKEY_type EVP_PKEY_RSA2
will return
.Dv EVP_PKEY_RSA .
.Pp
.Fn EVP_PKEY_set_type
frees the key referenced in
.Fa pkey ,
if any, and sets the key type of
.Fa pkey
to
.Fa type
without referencing a new key from
.Fa pkey
yet.
For
.Fa type ,
any of the possible return values of
.Fn EVP_PKEY_base_id
and
.Fn EVP_PKEY_id
can be passed.
.Pp
.Fn EVP_PKEY_set_type_str
frees the key referenced in
.Fa pkey ,
if any, and sets the key type of
.Fa pkey
according to the PEM type string given by the first
.Fa len
bytes of
.Fa str .
If
.Fa len
is \-1, the
.Xr strlen 3
of
.Fa str
is used instead.
The PEM type strings supported by default are listed in the table above.
This function does not reference a new key from
.Fa pkey .
.Pp
If
.Fa pkey
is a
.Dv NULL
pointer,
.Fn EVP_PKEY_set_type
and
.Fn EVP_PKEY_set_type_str
check that a matching key type exists but do not change any object.
.Pp
In accordance with the OpenSSL naming convention, the key obtained from
or assigned to
.Fa pkey
using the
.Sy 1
functions must be freed as well as
.Fa pkey .
.Sh RETURN VALUES
.Fn EVP_PKEY_set1_RSA ,
.Fn EVP_PKEY_set1_DSA ,
.Fn EVP_PKEY_set1_DH ,
.Fn EVP_PKEY_set1_EC_KEY ,
.Fn EVP_PKEY_assign_RSA ,
.Fn EVP_PKEY_assign_DSA ,
.Fn EVP_PKEY_assign_DH ,
.Fn EVP_PKEY_assign_EC_KEY ,
.Fn EVP_PKEY_assign_GOST ,
.Fn EVP_PKEY_assign ,
.Fn EVP_PKEY_set_type ,
and
.Fn EVP_PKEY_set_type_str
return 1 for success or 0 for failure.
.Pp
.Fn EVP_PKEY_get1_RSA ,
.Fn EVP_PKEY_get1_DSA ,
.Fn EVP_PKEY_get1_DH ,
.Fn EVP_PKEY_get1_EC_KEY ,
.Fn EVP_PKEY_get0_RSA ,
.Fn EVP_PKEY_get0_DSA ,
.Fn EVP_PKEY_get0_DH ,
.Fn EVP_PKEY_get0_EC_KEY ,
.Fn EVP_PKEY_get0_hmac ,
and
.Fn EVP_PKEY_get0
return the referenced key or
.Dv NULL
if an error occurred.
For
.Fn EVP_PKEY_get0 ,
the return value points to an
.Vt RSA ,
.Vt DSA ,
.Vt DH ,
.Vt EC_KEY ,
.Vt GOST_KEY ,
or
.Vt ASN1_OCTET_STRING
object depending on the type of
.Fa pkey .
.Pp
.Fn EVP_PKEY_base_id ,
.Fn EVP_PKEY_id ,
and
.Fn EVP_PKEY_type
return a key type or
.Dv NID_undef
(equivalently
.Dv EVP_PKEY_NONE )
on error.
.Sh SEE ALSO
.Xr DH_new 3 ,
.Xr DSA_new 3 ,
.Xr EC_KEY_new 3 ,
.Xr EVP_PKEY_get0_asn1 3 ,
.Xr EVP_PKEY_new 3 ,
.Xr RSA_new 3
.Sh HISTORY
.Fn EVP_PKEY_assign_RSA ,
.Fn EVP_PKEY_assign_DSA ,
.Fn EVP_PKEY_assign_DH ,
.Fn EVP_PKEY_assign ,
and
.Fn EVP_PKEY_type
first appeared in SSLeay 0.8.0 and have been available since
.Ox 2.4 .
.Pp
.Fn EVP_PKEY_set1_RSA ,
.Fn EVP_PKEY_set1_DSA ,
.Fn EVP_PKEY_set1_DH ,
.Fn EVP_PKEY_get1_RSA ,
.Fn EVP_PKEY_get1_DSA ,
and
.Fn EVP_PKEY_get1_DH
first appeared in OpenSSL 0.9.5 and have been available since
.Ox 2.7 .
.Pp
.Fn EVP_PKEY_set1_EC_KEY ,
.Fn EVP_PKEY_get1_EC_KEY ,
and
.Fn EVP_PKEY_assign_EC_KEY
first appeared in OpenSSL 0.9.8 and have been available since
.Ox 4.5 .
.Pp
.Fn EVP_PKEY_get0 ,
.Fn EVP_PKEY_base_id ,
.Fn EVP_PKEY_id ,
.Fn EVP_PKEY_set_type ,
and
.Fn EVP_PKEY_set_type_str
first appeared in OpenSSL 1.0.0 and have been available since
.Ox 4.9 .
.Pp
.Fn EVP_PKEY_assign_GOST
first appeared in
.Ox 5.7 .
.Pp
.Fn EVP_PKEY_get0_RSA ,
.Fn EVP_PKEY_get0_DSA ,
.Fn EVP_PKEY_get0_DH ,
and
.Fn EVP_PKEY_get0_EC_KEY
first appeared in OpenSSL 1.1.0 and have been available since
.Ox 6.3 .
.Pp
.Fn EVP_PKEY_get0_hmac
first appeared in OpenSSL 1.1.0 and has been available since
.Ox 6.5 .